{"id":56165,"date":"2026-06-15T16:43:34","date_gmt":"2026-06-15T16:43:34","guid":{"rendered":"https:\/\/xtmim.com\/?page_id=56165"},"modified":"2026-06-15T16:43:36","modified_gmt":"2026-06-15T16:43:36","slug":"420-vs-440c-stainless-steel","status":"publish","type":"page","link":"https:\/\/xtmim.com\/pt-br\/mim-materials\/compare\/420-vs-440c-stainless-steel\/","title":{"rendered":"A\u00e7o Inoxid\u00e1vel 420 vs 440C"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"56165\" class=\"elementor elementor-56165\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ab42659 e-con-full e-flex cmsmasters-bg-hide-none cmsmasters-bg-hide-none cmsmasters-block-default e-con e-parent\" data-id=\"ab42659\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-8eab721 e-flex e-con-boxed cmsmasters-block-default e-con e-child\" data-id=\"8eab721\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a2a427a cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-heading\" data-id=\"a2a427a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">420 vs 440C Stainless Steel for MIM Parts<\/h1>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-95bdbd1 e-con-full e-flex cmsmasters-block-default e-con e-parent\" data-id=\"95bdbd1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-8b41bb7 e-flex e-con-boxed cmsmasters-block-default e-con e-child\" data-id=\"8b41bb7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4f7dba4 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-html\" data-id=\"4f7dba4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\r\n.xtmim-420-440c-page {\r\n  --xt-primary: #1d4ed8;\r\n  --xt-primary-dark: #1e3a8a;\r\n  --xt-accent: #0f766e;\r\n  --xt-text: #1f2937;\r\n  --xt-muted: #64748b;\r\n  --xt-bg: #ffffff;\r\n  --xt-soft: #f8fafc;\r\n  --xt-soft-blue: #eff6ff;\r\n  --xt-border: #dbe3ef;\r\n  --xt-card: #ffffff;\r\n  --xt-radius-sm: 12px;\r\n  --xt-radius-md: 18px;\r\n  --xt-radius-lg: 26px;\r\n  --xt-shadow: 0 18px 44px rgba(15, 23, 42, 0.08);\r\n  --xt-container: 1600px;\r\n  width: 100%;\r\n  max-width: 100%;\r\n  color: var(--xt-text);\r\n  background: var(--xt-bg);\r\n  font-family: inherit;\r\n  font-size: 16px;\r\n  line-height: 1.7;\r\n  overflow-wrap: 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{\r\n    min-width: 720px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"xtmim-420-440c-page\">\r\n  <section class=\"xtmim-section xtmim-hero\" aria-labelledby=\"page-intro\">\r\n    <div class=\"xtmim-container xtmim-hero-content\">\r\n      <p class=\"xtmim-eyebrow\">MIM Material Comparison<\/p>\r\n      <div class=\"xtmim-hero-title\" id=\"page-intro\">420 vs 440C Stainless Steel<\/div>\r\n      <p class=\"xtmim-hero-subtitle\">\r\n        A MIM-focused comparison for hardness, wear resistance, corrosion behavior, heat treatment, dimensional control, and RFQ decisions.\r\n      <\/p>\r\n\r\n      <div class=\"xtmim-quick-answer\">\r\n        <p>\r\n          <strong>Quick answer:<\/strong> For MIM parts, 420 stainless steel is usually the more balanced option when the project needs moderate-to-high hardness, reasonable toughness, corrosion resistance, and easier post-sintering control. 440C stainless steel is more suitable when the application puts stronger priority on high hardness, wear resistance, and edge retention. The trade-off is that 440C usually requires stricter review of heat treatment, dimensional stability, grinding allowance, and final inspection.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-hero-actions\">\r\n        <a class=\"xtmim-btn xtmim-btn-primary\" href=\"https:\/\/xtmim.com\/submit-drawing-for-review\/\">Submit Drawing for Review<\/a>\r\n        <a class=\"xtmim-btn xtmim-btn-secondary\" href=\"https:\/\/xtmim.com\/request-a-quote\/\">Request a Quote<\/a>\r\n      <\/div>\r\n\r\n      <figure class=\"xtmim-figure xtmim-hero-figure\" data-image-status=\"final\" data-image-slot=\"image-01-hero\">\r\n        <img fetchpriority=\"high\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/01-mim-420-440c-stainless-comparison-hero.webp\" alt=\"Small MIM stainless steel components arranged for a 420 and 440C material comparison review.\" title=\"MIM 420 and 440C Stainless Steel Comparison\" width=\"2172\" height=\"724\" loading=\"eager\" fetchpriority=\"high\" decoding=\"async\">\r\n        <figcaption>420 and 440C stainless steel should be compared by MIM part geometry, hardness target, finishing route, and inspection risk.<\/figcaption>\r\n        <p class=\"xtmim-figure-note\"><strong>Core conclusion:<\/strong> The material choice depends on both performance requirements and MIM process control, not material name alone.<\/p>\r\n      <\/figure>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"quick-selection\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"quick-selection\">420 vs 440C Stainless Steel: Quick MIM Selection Answer<\/h2>\r\n      <p class=\"xtmim-section-intro\">\r\n        For general steel selection, the difference may look simple: 440C is often reviewed as the higher-hardness, higher-wear-resistance grade, while 420 is often selected for a more balanced combination of hardness, corrosion resistance, and manufacturability. In MIM, however, the decision is not based on material name alone.\r\n      <\/p>\r\n\r\n      <div class=\"xtmim-card-grid\">\r\n        <div class=\"xtmim-card\">\r\n          <h3>Choose 420 when balance matters<\/h3>\r\n          <p>420 stainless steel is often the more practical MIM route when the part needs useful hardness, reasonable toughness, corrosion resistance, and less demanding post-sintering control.<\/p>\r\n        <\/div>\r\n        <div class=\"xtmim-card\">\r\n          <h3>Choose 440C when wear is the main driver<\/h3>\r\n          <p>440C stainless steel is usually reviewed when the part needs higher hardness, stronger wear resistance, or improved edge retention on a contact surface.<\/p>\r\n        <\/div>\r\n        <div class=\"xtmim-card\">\r\n          <h3>Review first when geometry is sensitive<\/h3>\r\n          <p>Thin walls, small holes, sharp functional edges, strict flatness, and post-hardening dimensions should be reviewed before confirming either material route.<\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-badge-row\">\r\n        <span class=\"xtmim-badge\">Hardness target<\/span>\r\n        <span class=\"xtmim-badge\">Wear surface<\/span>\r\n        <span class=\"xtmim-badge\">Heat treatment<\/span>\r\n        <span class=\"xtmim-badge\">Dimensional risk<\/span>\r\n        <span class=\"xtmim-badge\">RFQ review<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-callout\">\r\n        <h3>Production review perspective<\/h3>\r\n        <p>In a MIM project, the material decision should be made together with geometry, shrinkage strategy, heat treatment, finishing allowance, and inspection requirements. A higher-hardness material is valuable only when the part can still meet the drawing after sintering, hardening, and secondary operations.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"key-differences\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"key-differences\">Key Differences Between 420 and 440C Stainless Steel in MIM<\/h2>\r\n      <p>\r\n        420 and 440C are both martensitic stainless steels, which means they can be hardened by heat treatment. This makes them different from common austenitic stainless steels such as 304 or 316L, where corrosion resistance and ductility are often more important than hardenability. In MIM projects, 420 and 440C are usually considered when the part needs hardness, wear resistance, contact strength, or a functional edge.\r\n      <\/p>\r\n      <p>\r\n        The main difference is that 440C is usually reviewed as a higher-carbon stainless steel route for higher hardness and stronger wear resistance after heat treatment. 420 is also hardenable, but it is normally considered a more balanced route when the part must combine hardness, corrosion resistance, manufacturability, and secondary operation control. For more background on each individual grade, review the XTMIM pages for <a href=\"https:\/\/xtmim.com\/mim-materials\/stainless-steel\/420-stainless-steel\/\">420 stainless steel<\/a> and <a href=\"https:\/\/xtmim.com\/mim-materials\/stainless-steel\/440c-stainless-steel\/\">440C stainless steel<\/a>.\r\n      <\/p>\r\n\r\n      <div class=\"xtmim-source-note\">\r\n        <p>\r\n          <strong>Technical source note:<\/strong> Public material technical data from Carpenter Technology supports the general grade direction used on this page: <a href=\"https:\/\/www.carpentertechnology.com\/hubfs\/7407324\/Material%20Saftey%20Data%20Sheets\/420.pdf\" target=\"_blank\" rel=\"nofollow noopener\">420 stainless steel<\/a> is a hardenable martensitic stainless grade, while <a href=\"https:\/\/www.carpentertechnology.com\/hubfs\/7407324\/Material%20Saftey%20Data%20Sheets\/440C.pdf\" target=\"_blank\" rel=\"nofollow noopener\">440C stainless steel<\/a> is positioned for very high hardness after heat treatment. For MIM projects, these references should be used as grade-level background only; final selection still depends on drawing review, heat treatment route, finishing, and inspection.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Review Factor<\/th>\r\n              <th>420 Stainless Steel<\/th>\r\n              <th>440C Stainless Steel<\/th>\r\n              <th>MIM Selection Meaning<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>Hardness potential<\/td>\r\n              <td>High after heat treatment, but usually lower than 440C<\/td>\r\n              <td>Very high after heat treatment<\/td>\r\n              <td>440C is stronger for high wear and edge retention requirements.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Wear resistance<\/td>\r\n              <td>Good for many functional MIM parts<\/td>\r\n              <td>Higher wear resistance<\/td>\r\n              <td>440C is often reviewed for higher-contact or sliding wear surfaces.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Toughness balance<\/td>\r\n              <td>Usually more forgiving<\/td>\r\n              <td>Lower toughness margin when very hard<\/td>\r\n              <td>420 may be safer for thin, impact-sensitive, or geometry-sensitive features.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Corrosion behavior<\/td>\r\n              <td>Depends on heat treatment, finish, and environment<\/td>\r\n              <td>Also depends on heat treatment, finish, and environment<\/td>\r\n              <td>Neither should be treated as automatically corrosion-proof.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Processing sensitivity<\/td>\r\n              <td>Usually easier to balance<\/td>\r\n              <td>Usually more demanding<\/td>\r\n              <td>440C needs more careful process and heat treatment review.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Secondary operations<\/td>\r\n              <td>Generally easier to review<\/td>\r\n              <td>Grinding or polishing may need more control<\/td>\r\n              <td>440C can add inspection and finishing complexity.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-warning\">\r\n        <h3>Do not select by hardness alone<\/h3>\r\n        <p>A datasheet-level material comparison can help define the starting direction, but it does not replace drawing review. MIM selection must connect material behavior with tooling compensation, sintering shrinkage, heat treatment, finishing allowance, and final inspection. The final recommendation may change if the part has thin edges, unsupported features, tight holes, or cosmetic surfaces.<\/p>\r\n      <\/div>\r\n\r\n      <figure class=\"xtmim-figure\" data-image-status=\"final\" data-image-slot=\"image-02-core-comparison\">\r\n        <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/02-420-440c-mim-engineering-comparison.webp\" alt=\"Engineering comparison layout showing 420 and 440C MIM stainless steel review factors such as wear, corrosion, toughness, and dimensional control.\" title=\"Engineering Comparison of 420 and 440C MIM Stainless Steel\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>A MIM material comparison should connect hardness and wear resistance with dimensional control and secondary operations.<\/figcaption>\r\n        <p class=\"xtmim-figure-note\"><strong>Core conclusion:<\/strong> 440C usually favors wear performance, while 420 often supports a more balanced MIM route.<\/p>\r\n      <\/figure>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"mim-processing\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"mim-processing\">How MIM Processing Changes the 420 vs 440C Decision<\/h2>\r\n      <p>\r\n        MIM changes the material decision because the part is not machined from wrought bar stock. The process starts with prepared metal powder feedstock, followed by injection molding, green part handling, debinding, <a href=\"https:\/\/xtmim.com\/mim-process\/sintering\/sintering-shrinkage\/\">sintering shrinkage<\/a> control, possible heat treatment, secondary operations, and final inspection. Each step can influence the final part geometry, density, surface condition, and dimensional repeatability.\r\n      <\/p>\r\n      <p>\r\n        For 420 stainless steel, the review often focuses on achieving a stable balance between hardness, dimensional control, corrosion exposure, and secondary operation needs. For 440C stainless steel, the review usually becomes more demanding because the project may require higher hardness and wear performance after heat treatment. That can increase attention to distortion, grinding allowance, brittle edge risk, and final inspection.\r\n      <\/p>\r\n\r\n      <div class=\"xtmim-two-col\">\r\n        <div class=\"xtmim-card\">\r\n          <h3>Feedstock and molding stability<\/h3>\r\n          <p>The project should first confirm whether the selected MIM feedstock is available and suitable for the part geometry. Small holes, thin walls, ribs, undercuts, and contact surfaces can behave differently during injection and sintering.<\/p>\r\n        <\/div>\r\n        <div class=\"xtmim-card\">\r\n          <h3>Debinding and sintering sensitivity<\/h3>\r\n          <p>Debinding and sintering influence shrinkage, density, surface condition, and distortion. The material route should be reviewed together with the final geometry and inspection plan.<\/p>\r\n        <\/div>\r\n        <div class=\"xtmim-card\">\r\n          <h3>Shrinkage and dimensional repeatability<\/h3>\r\n          <p>Tooling compensation can be designed, but it cannot remove all risks from uneven wall thickness, long slender features, unsupported shapes, or unbalanced mass distribution.<\/p>\r\n        <\/div>\r\n        <div class=\"xtmim-card\">\r\n          <h3>Heat treatment after sintering<\/h3>\r\n          <p>Both 420 and 440C may require heat treatment to reach the intended hardness. The drawing should define target hardness, test location, and critical dimensions after hardening.<\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>MIM Review Point<\/th>\r\n              <th>Why It Matters<\/th>\r\n              <th>What Can Go Wrong<\/th>\r\n              <th>What to Confirm Before RFQ<\/th>\r\n              <th>Inspection Focus<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>Feedstock availability<\/td>\r\n              <td>Material route affects sampling and production feasibility.<\/td>\r\n              <td>Material choice may increase lead time or limit route options.<\/td>\r\n              <td>Target material, annual volume, and whether an alternative grade is acceptable.<\/td>\r\n              <td>Material identity and incoming feedstock consistency.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Injection molding<\/td>\r\n              <td>Thin walls, ribs, holes, and contact surfaces may be difficult to fill uniformly.<\/td>\r\n              <td>Short fill, weld lines, weak features, or uneven green part quality.<\/td>\r\n              <td>3D model, wall thickness, gate-sensitive surfaces, and appearance areas.<\/td>\r\n              <td>Green part visual condition and feature completeness.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Sintering shrinkage<\/td>\r\n              <td>MIM parts shrink during sintering and require tooling compensation.<\/td>\r\n              <td>Hole shift, flatness change, local distortion, or out-of-tolerance features.<\/td>\r\n              <td>Critical dimensions, datum, tolerance class, and inspection priority.<\/td>\r\n              <td>Post-sintering dimensions, flatness, hole position, and surface condition.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Heat treatment<\/td>\r\n              <td>Hardness depends on heat treatment, but heat treatment may affect dimensions.<\/td>\r\n              <td>Distortion, local hardness variation, chipping risk, or extra finishing needs.<\/td>\r\n              <td>Target hardness, test location, functional surface, and acceptable distortion.<\/td>\r\n              <td>Hardness, functional dimensions, visual edges, and wear surfaces.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Secondary operations<\/td>\r\n              <td>Grinding, polishing, passivation, PVD, or sizing may change final cost and risk.<\/td>\r\n              <td>Additional cost, longer process route, surface variation, or dimensional change.<\/td>\r\n              <td>Surface finish, cosmetic requirement, coating need, and post-process tolerance.<\/td>\r\n              <td>Surface roughness, coating appearance, dimension after finishing, and fit.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p>\r\n        If the part needs detailed post-sintering hardening review, use the <a href=\"https:\/\/xtmim.com\/mim-process\/secondary-operations\/heat-treatment\/\">MIM heat treatment<\/a> page as the process reference. For polishing, passivation, PVD, or other finishing needs, review <a href=\"https:\/\/xtmim.com\/mim-process\/secondary-operations\/surface-finishing\/\">surface finishing for MIM parts<\/a>.\r\n      <\/p>\r\n\r\n      <figure class=\"xtmim-figure\" data-image-status=\"final\" data-image-slot=\"image-03-mim-process-review\">\r\n        <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/03-mim-process-review-420-440c-stainless.webp\" alt=\"MIM process review sequence for 420 and 440C stainless steel parts, including feedstock, injection molding, debinding, sintering, heat treatment, and inspection.\" title=\"MIM Process Review for 420 and 440C Stainless Steel\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>MIM material selection must include process behavior from feedstock to final inspection.<\/figcaption>\r\n        <p class=\"xtmim-figure-note\"><strong>Core conclusion:<\/strong> The same stainless steel comparison changes when shrinkage, heat treatment, and dimensional repeatability are included.<\/p>\r\n      <\/figure>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"hardness-wear-edge\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"hardness-wear-edge\">Hardness, Wear Resistance, and Edge Retention<\/h2>\r\n      <p>\r\n        When users search for 420 vs 440C stainless steel, they often care about hardness and wear resistance. In general, 440C is the stronger candidate when high hardness and edge retention are the main goals. This is why it is often associated with bearing-like surfaces, cutting-related components, and wear-resistant applications. 420 can still be hardened, but it is usually selected when the project needs a more balanced combination of hardness, corrosion resistance, manufacturability, and toughness.\r\n      <\/p>\r\n\r\n      <div class=\"xtmim-source-note\">\r\n        <p>\r\n          <strong>Technical source note:<\/strong> Carpenter Technology material data supports the broad hardness direction used here: its 440C technical data describes a very high hardness route after heat treatment, while its 420 technical data supports 420 as a hardenable martensitic stainless grade. This does not mean every MIM part will reach the same result; final hardness, dimensional stability, and surface quality depend on the project-specific process route.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <p>\r\n        For MIM parts, the question should not be \u201cWhich grade is harder?\u201d The better question is: \u201cWhat hardness is required at the functional surface, and can the part still meet dimensional and quality requirements after heat treatment?\u201d If the part has a small wear surface, 440C may be appropriate. If the part has thin features, a complex shape, or impact loading, 420 may be easier to control.\r\n      <\/p>\r\n\r\n      <div class=\"xtmim-callout\">\r\n        <h3>Functional surface review checklist<\/h3>\r\n        <ul class=\"xtmim-list\">\r\n          <li>Define whether the part has a wear surface, cutting-related edge, sliding contact, or bearing-like contact area.<\/li>\r\n          <li>Confirm whether the functional surface is molded near-net shape, machined, ground, polished, or coated after sintering.<\/li>\r\n          <li>Specify the hardness target and test location instead of only requesting \u201chigh hardness.\u201d<\/li>\r\n          <li>Review whether local geometry can tolerate hardening, grinding allowance, and final inspection.<\/li>\r\n          <li>Confirm whether edge retention, corrosion exposure, dimensional control, or cost is the leading requirement.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-callout\">\r\n        <h3>Engineering review note<\/h3>\r\n        <p>\r\n          A cutting edge, small contact tooth, sliding surface, or wear pad can benefit from higher hardness. However, high hardness can also reduce tolerance for impact, chipping, or distortion. In MIM projects, edge performance is usually a combination of material, heat treatment, geometry, surface finish, and inspection method.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <figure class=\"xtmim-figure\" data-image-status=\"final\" data-image-slot=\"image-04-wear-contact-parts\">\r\n        <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/04-wear-contact-mim-parts-420-440c.webp\" alt=\"Small wear-contact MIM stainless steel components showing edge and surface features relevant to 420 and 440C material selection.\" title=\"Wear Contact MIM Parts in 420 and 440C Stainless Steel\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>Cutting-related MIM parts should be reviewed by wear surface, edge geometry, hardness target, and inspection method.<\/figcaption>\r\n        <p class=\"xtmim-figure-note\"><strong>Core conclusion:<\/strong> 440C may favor edge retention, but 420 may be easier to balance for thin or complex MIM geometry.<\/p>\r\n      <\/figure>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"corrosion-finishing\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"corrosion-finishing\">Corrosion Resistance and Surface Finishing Considerations<\/h2>\r\n      <p>420 and 440C are stainless steels, but neither should be described as corrosion-proof. Corrosion behavior depends on the chemical environment, heat treatment condition, surface roughness, cleaning method, finishing route, and whether the part will be exposed to moisture, sweat, mild chemicals, chloride, or repeated handling.<\/p>\r\n      <p>In many MIM projects, corrosion resistance must be reviewed together with surface finishing. A polished, passivated, or coated part may behave differently from an as-sintered surface. If the application requires cosmetic appearance, reduced surface roughness, or improved contact behavior, the team may need to review polishing, passivation, PVD, or other finishing options. These steps may affect cost, lead time, inspection criteria, and dimensional control.<\/p>\r\n      <p>The RFQ should include the actual use environment. A vague request such as \u201cstainless steel with high hardness\u201d is not enough for reliable material selection. The project should clarify whether the part is used in dry wear, hand-contact environments, outdoor exposure, cleaning cycles, mild corrosion, or contact with other materials.<\/p>\r\n\r\n      <div class=\"xtmim-warning\">\r\n        <h3>Corrosion review boundary<\/h3>\r\n        <p>If corrosion resistance is the leading requirement, the project should not compare only 420 and 440C. The team should also review whether a different stainless steel family, a finishing route, or a coating strategy is more appropriate. 420 and 440C can be useful when hardness matters, but corrosion-sensitive applications need environment details before material confirmation.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"dimensional-risk\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"dimensional-risk\">Dimensional Stability, Heat Treatment, and Post-Sintering Risk<\/h2>\r\n      <p>Dimensional stability is one of the most important differences between a simple steel comparison and a MIM project comparison. 420 and 440C are both hardenable materials, but the final part is affected by sintering shrinkage, heat treatment, and secondary operations. If a drawing contains tight hole positions, flatness requirements, thin edges, small contact surfaces, or datum-critical geometry, the material choice should be reviewed before tooling.<\/p>\r\n      <p>Heat treatment can improve hardness, but it can also create distortion risk. This does not mean the material is unsuitable. It means the project should define what must be controlled after heat treatment. For example, a wear surface may be more important than a non-critical outer contour. A hole may need <a href=\"https:\/\/xtmim.com\/mim-process\/secondary-operations\/mim-sizing\/\">MIM sizing<\/a> or <a href=\"https:\/\/xtmim.com\/mim-process\/secondary-operations\/post-sintering-machining\/\">post-sintering machining<\/a>. A flat surface may need grinding allowance. A small edge may need special inspection to check chipping, deformation, or surface damage.<\/p>\r\n\r\n      <div class=\"xtmim-card\">\r\n        <h3>Before tooling, confirm these items<\/h3>\r\n        <ul class=\"xtmim-list\">\r\n          <li>Which dimensions are critical after heat treatment<\/li>\r\n          <li>Whether hardness is measured on a surface or cross-section<\/li>\r\n          <li>Whether grinding or polishing is required after hardening<\/li>\r\n          <li>Whether the part has thin or unsupported features<\/li>\r\n          <li>Whether final inspection includes hardness, dimension, surface, and visual checks<\/li>\r\n          <li>Whether the acceptable risk is different for prototype and mass production<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Drawing Feature<\/th>\r\n              <th>Why It Matters for 420 \/ 440C<\/th>\r\n              <th>Review Action<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>Small holes<\/td>\r\n              <td>Hole position and diameter may change after sintering and heat treatment.<\/td>\r\n              <td>Identify whether sizing, machining, or special inspection is required.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Thin contact edges<\/td>\r\n              <td>Higher hardness may improve wear but can increase edge sensitivity.<\/td>\r\n              <td>Confirm edge geometry, finishing method, and inspection acceptance.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Flat bearing or sliding surfaces<\/td>\r\n              <td>Flatness may be affected by shrinkage and post-hardening distortion.<\/td>\r\n              <td>Define flatness requirement and grinding allowance before tooling.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Cosmetic exposed surfaces<\/td>\r\n              <td>Surface finish and corrosion behavior depend on process route and finishing.<\/td>\r\n              <td>Confirm polishing, passivation, PVD, or visual inspection needs.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Assembly datum surfaces<\/td>\r\n              <td>Datum shift can affect fit even when general dimensions look acceptable.<\/td>\r\n              <td>Mark datum-critical dimensions clearly in the drawing package.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"scissors-cutting-components\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"scissors-cutting-components\">420 vs 440C Stainless Steel for Scissors, Cutting Components, and Wear Parts<\/h2>\r\n      <p>For scissors and cutting-related components, 440C is usually considered when edge retention and wear resistance are the top priorities. Its higher hardenability makes it attractive for hardened contact edges and wear surfaces. However, in MIM production, a \u201cscissors\u201d search intent should be translated into engineering requirements: edge geometry, thickness, load direction, corrosion exposure, finishing method, and post-heat-treatment inspection.<\/p>\r\n      <p>420 may still be a better MIM choice when the component is small, complex, thin, or not purely judged by edge retention. For example, if the part needs several small holes, clips, ribs, or mounting features, 420 may provide a more practical balance between hardness, manufacturability, toughness, and secondary operation cost.<\/p>\r\n      <p>The material name alone does not define cutting performance. A MIM cutting component should be reviewed by drawing. If the functional edge must be very sharp, it may need post-sintering grinding. If the edge is molded near-net shape, the design should allow for shrinkage, finishing, and inspection.<\/p>\r\n\r\n      <div class=\"xtmim-callout\">\r\n        <h3>How to translate \u201cscissors\u201d into MIM engineering requirements<\/h3>\r\n        <p>Instead of asking only whether 420 or 440C is better for scissors, define the actual part function. A MIM supplier needs to know whether the part requires a true cutting edge, a wear-contact surface, a pivot feature, a spring-contact area, or a cosmetic stainless surface. Each function may lead to a different material, heat treatment, finishing, and inspection plan.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"decision-table\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"decision-table\">Decision Table: When to Choose 420 or 440C for MIM Parts<\/h2>\r\n      <p class=\"xtmim-section-intro\">The following table should be used as a starting point for engineering review. Final selection should still depend on the drawing, application environment, heat treatment route, finishing requirement, and inspection plan.<\/p>\r\n\r\n      <div class=\"xtmim-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Project Condition<\/th>\r\n              <th>Choose 420 Stainless Steel When...<\/th>\r\n              <th>Choose 440C Stainless Steel When...<\/th>\r\n              <th>Review Before Deciding<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>Hardness<\/td>\r\n              <td>Moderate-to-high hardness is enough.<\/td>\r\n              <td>Higher hardness is a key requirement.<\/td>\r\n              <td>Define target hardness range and test location.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Wear resistance<\/td>\r\n              <td>Wear is present but not the only priority.<\/td>\r\n              <td>Wear resistance is the main design driver.<\/td>\r\n              <td>Confirm contact type, load, and sliding condition.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Edge retention<\/td>\r\n              <td>Functional edge is not extremely demanding.<\/td>\r\n              <td>Edge retention is critical.<\/td>\r\n              <td>Confirm whether the edge is molded, ground, or finished.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Toughness<\/td>\r\n              <td>Thin or impact-sensitive features matter.<\/td>\r\n              <td>The design can tolerate a lower toughness margin.<\/td>\r\n              <td>Review local stress and edge geometry.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Dimensional control<\/td>\r\n              <td>Tight dimensions and balanced manufacturability matter.<\/td>\r\n              <td>Higher performance justifies tighter process control.<\/td>\r\n              <td>Identify critical dimensions after heat treatment.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Corrosion exposure<\/td>\r\n              <td>Mild corrosion and finishing can be managed.<\/td>\r\n              <td>Wear is more important than maximum corrosion resistance.<\/td>\r\n              <td>Confirm actual environment and surface finish.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Cost and lead time<\/td>\r\n              <td>Process simplicity matters.<\/td>\r\n              <td>Extra finishing and inspection are acceptable.<\/td>\r\n              <td>Compare total project cost, not only material cost.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-warning\">\r\n        <h3>When neither route should be confirmed yet<\/h3>\r\n        <p>Do not confirm 420 or 440C if the drawing does not define the functional surface, target hardness, corrosion exposure, critical dimensions, or finishing route. Also avoid locking the material too early when the part has thin walls, long unsupported features, very small holes, or strict post-hardening tolerances. In these cases, the first step should be drawing review, not immediate material confirmation.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-callout\">\r\n        <h3>Ask for engineering review when geometry is sensitive<\/h3>\r\n        <p>A project should ask for engineering review when the drawing includes thin walls, long unsupported features, very small holes, sharp functional edges, strict flatness, tight post-heat-treatment tolerances, or a hard-to-inspect wear surface. These conditions can change the material choice even when the initial performance target points to 440C.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"rfq-information\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"rfq-information\">RFQ Information Needed Before Comparing 420 and 440C<\/h2>\r\n      <p>To compare 420 and 440C correctly, the RFQ should include more than a material name. The most useful inputs are the 2D drawing, 3D model, expected annual volume, target hardness, application environment, functional surfaces, surface finishing requirements, and inspection priorities. If the drawing is missing hardness range, critical dimensions, or finishing notes, the supplier may not be able to compare the two materials accurately.<\/p>\r\n\r\n      <div class=\"xtmim-two-col\">\r\n        <div class=\"xtmim-card\">\r\n          <h3>Send these drawing inputs<\/h3>\r\n          <ul class=\"xtmim-list\">\r\n            <li>2D drawing with tolerances, datum, and critical dimensions<\/li>\r\n            <li>3D model for geometry and tooling review<\/li>\r\n            <li>Material target: 420, 440C, or open to engineering recommendation<\/li>\r\n            <li>Expected annual volume and production stage<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n        <div class=\"xtmim-card\">\r\n          <h3>Send these functional requirements<\/h3>\r\n          <ul class=\"xtmim-list\">\r\n            <li>Target hardness range and test location, if known<\/li>\r\n            <li>Wear surface, cutting edge, sliding surface, or contact area<\/li>\r\n            <li>Corrosion environment, cleaning method, or handling condition<\/li>\r\n            <li>Surface finish requirement, such as polishing, passivation, PVD, or grinding<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"xtmim-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>RFQ Input<\/th>\r\n              <th>Why XTMIM Needs It<\/th>\r\n              <th>How It Affects 420 vs 440C Review<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>2D drawing and 3D model<\/td>\r\n              <td>To review geometry, tooling feasibility, shrinkage risk, and inspection requirements.<\/td>\r\n              <td>Complex geometry may favor a more balanced material route or require secondary operations.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Hardness target<\/td>\r\n              <td>To understand whether hardness is functional, cosmetic, or only a preference.<\/td>\r\n              <td>Higher hardness may support 440C, but only if distortion and inspection risks are acceptable.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Wear or contact surface<\/td>\r\n              <td>To identify the surface that actually drives material selection.<\/td>\r\n              <td>Localized wear may require 440C or finishing; general structural use may not.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Corrosion environment<\/td>\r\n              <td>To avoid choosing a hardenable stainless grade without understanding exposure conditions.<\/td>\r\n              <td>Environment may change finishing needs or require another stainless route.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Surface finish and post-process needs<\/td>\r\n              <td>To estimate grinding, polishing, passivation, PVD, or inspection requirements.<\/td>\r\n              <td>Secondary operations may change the practical cost and feasibility of 440C.<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Annual volume<\/td>\r\n              <td>To evaluate tooling value, process control effort, and production stability requirements.<\/td>\r\n              <td>Higher volume can justify more controlled processing if the material benefit is real.<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p>If the project is still in early development, it is safer to state the function first rather than forcing the material decision. For example, \u201cthe part needs wear resistance on this contact surface and corrosion resistance during handling\u201d is more useful than simply writing \u201cuse 440C.\u201d A MIM material review can then compare whether 420, 440C, or another stainless steel route is more appropriate. For a broader document checklist, review the <a href=\"https:\/\/xtmim.com\/rfq-preparation-guide\/\">RFQ preparation guide<\/a>.<\/p>\r\n\r\n      <figure class=\"xtmim-figure\" data-image-status=\"final\" data-image-slot=\"image-05-rfq-review\">\r\n        <img loading=\"lazy\" src=\"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/05-rfq-review-420-440c-mim-parts.webp\" alt=\"Engineering RFQ review desk with MIM stainless steel sample parts, blurred drawings, and material selection notes for 420 and 440C stainless steel.\" title=\"RFQ Review for 420 and 440C MIM Stainless Steel Parts\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>A reliable RFQ should include drawings, 3D files, hardness target, functional surfaces, finishing needs, and annual volume.<\/figcaption>\r\n        <p class=\"xtmim-figure-note\"><strong>Core conclusion:<\/strong> Material selection becomes more reliable when function, geometry, finishing, and inspection requirements are submitted together.<\/p>\r\n      <\/figure>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-compact\" aria-labelledby=\"material-family-links\">\r\n    <div class=\"xtmim-container\">\r\n      <div class=\"xtmim-card\">\r\n        <h2 id=\"material-family-links\">Related MIM Material Pages<\/h2>\r\n        <p>This page is a focused comparison between 420 and 440C. For broader material routing, review the <a href=\"https:\/\/xtmim.com\/mim-materials\/compare\/\">MIM material comparison<\/a> page. For grade-specific details, review the individual pages for <a href=\"https:\/\/xtmim.com\/mim-materials\/stainless-steel\/420-stainless-steel\/\">420 stainless steel<\/a> and <a href=\"https:\/\/xtmim.com\/mim-materials\/stainless-steel\/440c-stainless-steel\/\">440C stainless steel<\/a>.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-faq\" aria-labelledby=\"faq\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"faq\">FAQ About 420 vs 440C Stainless Steel in MIM<\/h2>\r\n\r\n      <details>\r\n        <summary>Is 440C always better than 420 stainless steel for MIM parts?<\/summary>\r\n        <p>No. 440C can offer higher hardness and stronger wear resistance, but it is not automatically better for every MIM part. If the part has thin sections, tight dimensions, impact exposure, or cost-sensitive production requirements, 420 may be easier to balance.<\/p>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Which is better for MIM scissors or cutting components, 420 or 440C?<\/summary>\r\n        <p>440C is usually preferred when edge retention and wear resistance are the main priorities. 420 may be more practical when the part also needs better manufacturability, dimensional control, or a more balanced toughness and corrosion profile.<\/p>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Is 420 stainless steel easier to process by MIM than 440C?<\/summary>\r\n        <p>In many projects, 420 is easier to review as a balanced hardenable stainless steel. 440C can be suitable, but it usually needs more careful review of heat treatment, distortion, grinding allowance, and final inspection.<\/p>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Can 420 and 440C both be heat treated after MIM sintering?<\/summary>\r\n        <p>Yes, both materials can be reviewed for post-sintering heat treatment. The project should define the target hardness, test location, critical dimensions, and acceptable distortion before confirming the material route.<\/p>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Which material has better corrosion resistance, 420 or 440C?<\/summary>\r\n        <p>The answer depends on heat treatment condition, surface roughness, finishing route, and use environment. Neither material should be selected only by the term \u201cstainless.\u201d For corrosion-sensitive applications, the RFQ should include the expected environment and surface finish requirement.<\/p>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>What should I send before choosing 420 or 440C for a MIM project?<\/summary>\r\n        <p>Send the 2D drawing, 3D model, target hardness, functional wear or cutting surfaces, corrosion environment, required surface finish, annual volume, and inspection requirements. These details allow the supplier to compare material performance and process risk together.<\/p>\r\n      <\/details>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-author\" aria-labelledby=\"engineering-review\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"engineering-review\">Engineering Review Note<\/h2>\r\n      <div class=\"xtmim-card\">\r\n        <h3>Reviewed by XTMIM Engineering Team<\/h3>\r\n        <p>This page is prepared for engineers and sourcing teams comparing 420 and 440C stainless steel for MIM parts. The review focuses on material selection, MIM process behavior, heat treatment, dimensional control, surface finishing, inspection, and RFQ preparation. Final selection should be confirmed by drawing review and application requirements.<\/p>\r\n        <p>XTMIM reviews MIM projects from a drawing-based perspective. The practical material recommendation depends on part geometry, functional surfaces, critical dimensions, target hardness, finishing requirements, inspection expectations, and production volume. This page should be used as a selection guide before RFQ, not as a guaranteed material performance statement.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-standards\" aria-labelledby=\"standards-note\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"standards-note\">Material Review Note<\/h2>\r\n      <p>This page provides engineering selection guidance for MIM material review. Final material selection should be confirmed by drawing requirements, target hardness, heat treatment condition, functional surfaces, corrosion environment, and inspection method. The page does not claim guaranteed hardness, guaranteed corrosion resistance, or certified performance for every application.<\/p>\r\n      <p>Public material references can help define general grade positioning, but MIM project results depend on feedstock route, tooling compensation, sintering behavior, heat treatment, finishing, and inspection. The final project route should be confirmed through supplier review rather than copied directly from wrought-material assumptions.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section xtmim-references\" aria-labelledby=\"technical-references\">\r\n    <div class=\"xtmim-container\">\r\n      <h2 id=\"technical-references\">Technical References<\/h2>\r\n      <p class=\"xtmim-section-intro\">The following external references may help engineering and sourcing teams review material terminology and grade-level background information. They are provided as technical context and do not imply certification, approval, or endorsement of any specific XTMIM project.<\/p>\r\n      <ul class=\"xtmim-reference-list\">\r\n        <li>\r\n          <a href=\"https:\/\/www.carpentertechnology.com\/hubfs\/7407324\/Material%20Saftey%20Data%20Sheets\/420.pdf\" target=\"_blank\" rel=\"nofollow noopener\">Carpenter Technology 420 Stainless Technical Data<\/a>\r\n          <span>\u2014 Reference for 420 stainless steel grade background and hardenable martensitic stainless steel context.<\/span>\r\n        <\/li>\r\n        <li>\r\n          <a href=\"https:\/\/www.carpentertechnology.com\/hubfs\/7407324\/Material%20Saftey%20Data%20Sheets\/440C.pdf\" target=\"_blank\" rel=\"nofollow noopener\">Carpenter Technology 440C Stainless Technical Data<\/a>\r\n          <span>\u2014 Reference for 440C stainless steel grade background and high-hardness martensitic stainless steel context.<\/span>\r\n        <\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"xtmim-section\" aria-labelledby=\"project-review-cta\">\r\n    <div class=\"xtmim-container\">\r\n      <div class=\"xtmim-cta\">\r\n        <h2 id=\"project-review-cta\">Compare 420 and 440C Before Tooling<\/h2>\r\n        <p>If you are comparing 420 and 440C stainless steel for a MIM part, send your drawing, 3D model, hardness target, wear surface, corrosion environment, and annual volume for review. XTMIM can help evaluate whether 420, 440C, or another MIM stainless steel route is more suitable before tooling.<\/p>\r\n        <div class=\"xtmim-cta-actions\">\r\n          <a class=\"xtmim-btn xtmim-btn-primary\" href=\"https:\/\/xtmim.com\/submit-drawing-for-review\/\">Submit Drawing for Review<\/a>\r\n          <a class=\"xtmim-btn xtmim-btn-secondary\" href=\"https:\/\/xtmim.com\/request-a-quote\/\">Request a Quote<\/a>\r\n        <\/div>\r\n        <p class=\"xtmim-small-note\">For best review accuracy, include the 2D drawing, 3D file, hardness target, surface finish requirement, critical dimensions, and annual volume.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n<\/article>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@graph\": [\r\n    {\r\n      \"@type\": \"BreadcrumbList\",\r\n      \"@id\": \"https:\/\/xtmim.com\/mim-materials\/compare\/420-vs-440c-stainless-steel\/#breadcrumb\",\r\n      \"itemListElement\": [\r\n        {\r\n          \"@type\": \"ListItem\",\r\n          \"position\": 1,\r\n          \"name\": \"Home\",\r\n          \"item\": \"https:\/\/xtmim.com\/\"\r\n        },\r\n        {\r\n          \"@type\": \"ListItem\",\r\n          \"position\": 2,\r\n          \"name\": \"MIM Materials\",\r\n          \"item\": \"https:\/\/xtmim.com\/mim-materials\/\"\r\n        },\r\n        {\r\n          \"@type\": \"ListItem\",\r\n          \"position\": 3,\r\n          \"name\": \"MIM Material Comparison\",\r\n          \"item\": \"https:\/\/xtmim.com\/mim-materials\/compare\/\"\r\n        },\r\n        {\r\n          \"@type\": \"ListItem\",\r\n          \"position\": 4,\r\n          \"name\": \"420 vs 440C Stainless Steel\",\r\n          \"item\": \"https:\/\/xtmim.com\/mim-materials\/compare\/420-vs-440c-stainless-steel\/\"\r\n        }\r\n      ]\r\n    },\r\n    {\r\n      \"@type\": \"TechArticle\",\r\n      \"@id\": \"https:\/\/xtmim.com\/mim-materials\/compare\/420-vs-440c-stainless-steel\/#techarticle\",\r\n      \"mainEntityOfPage\": \"https:\/\/xtmim.com\/mim-materials\/compare\/420-vs-440c-stainless-steel\/\",\r\n      \"headline\": \"420 vs 440C Stainless Steel\",\r\n      \"description\": \"A MIM-focused comparison of 420 and 440C stainless steel for hardness, wear resistance, corrosion behavior, heat treatment, dimensional control, and RFQ decisions.\",\r\n      \"image\": [\r\n        \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/01-mim-420-440c-stainless-comparison-hero.webp\",\r\n        \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/02-420-440c-mim-engineering-comparison.webp\",\r\n        \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/03-mim-process-review-420-440c-stainless.webp\",\r\n        \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/04-wear-contact-mim-parts-420-440c.webp\",\r\n        \"https:\/\/xtmim.com\/wp-content\/uploads\/2026\/06\/05-rfq-review-420-440c-mim-parts.webp\"\r\n      ],\r\n      \"author\": {\r\n        \"@type\": \"Organization\",\r\n        \"name\": \"XTMIM Engineering Team\"\r\n      },\r\n      \"publisher\": {\r\n        \"@type\": \"Organization\",\r\n        \"name\": \"XTMIM\"\r\n      },\r\n      \"about\": [\r\n        \"420 stainless steel\",\r\n        \"440C stainless steel\",\r\n        \"metal injection molding\",\r\n        \"MIM material comparison\",\r\n        \"MIM heat treatment\",\r\n        \"wear-resistant MIM parts\"\r\n      ]\r\n    },\r\n    {\r\n      \"@type\": \"FAQPage\",\r\n      \"@id\": \"https:\/\/xtmim.com\/mim-materials\/compare\/420-vs-440c-stainless-steel\/#faq\",\r\n      \"mainEntity\": [\r\n        {\r\n          \"@type\": \"Question\",\r\n          \"name\": \"Is 440C always better than 420 stainless steel for MIM parts?\",\r\n          \"acceptedAnswer\": {\r\n            \"@type\": \"Answer\",\r\n            \"text\": \"No. 440C can offer higher hardness and stronger wear resistance, but it is not automatically better for every MIM part. 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