{"id":9293,"date":"2025-08-01T16:08:32","date_gmt":"2025-08-01T08:08:32","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=9293"},"modified":"2026-04-24T20:29:36","modified_gmt":"2026-04-24T12:29:36","slug":"440c-stainless-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/440c-stainless-steel\/","title":{"rendered":"440C Stainless Steel (1.4125 \/ SUS440C) Supplier | Round Bar &amp; Plate Bulk Supply"},"content":{"rendered":"<div class=\"wp-block-cover alignfull\"><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"632\" class=\"wp-block-cover__image-background wp-image-7233 size-full\" alt=\"\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3.webp\" data-object-fit=\"cover\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3.webp 1920w, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-300x99.webp 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-1024x337.webp 1024w, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-768x253.webp 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-1536x506.webp 1536w, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-18x6.webp 18w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\" style=\"background-color:#4e4b40\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-block-cover-is-layout-constrained\">\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fa80bdcf\"><h1 class=\"uagb-heading-text\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">440C STAINLESS STEEL | 1.4125 | SUS440C<\/mark> Supplier for Bulk Orders<\/h1><p class=\"uagb-desc-text\">1.4125 \/ SUS440C Round Bar &amp; Plate | MOQ 5 Tons | Export Mill Length 2\u20135.5m<\/p><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Send Inquiry Now<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-c40b4c7b alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<p class=\"wp-block-paragraph\">440C stainless steel is a high-carbon, high-chromium martensitic stainless steel.&nbsp;It belongs to the 400 series of stainless steels, which are generally magnetic.&nbsp;In the medical field, 440C steel is widely used for manufacturing surgical knives and other medical instruments. It is also used in industry to manufacture corrosion-resistant plastic and rubber molds.&nbsp;<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-f640db95 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\" id=\"h-440c-stainless-steel-supply-overview\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-3-color\">440C Stainless Steel Supply Overview<\/mark><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Grade<\/td><td>440C STAINLESS STEEL | 1.4125 | SUS440C<\/td><\/tr><tr><td>Delivery Condition<\/td><td>Fully Annealed (Soft Condition for Machining)<\/td><\/tr><tr><td>Available Forms<\/td><td>Round Bar \/ Flat Bar \/ Plate \/ Forged Block<\/td><\/tr><tr><td>Monthly Production Capacity<\/td><td>Approx. 1000 metric tons<\/td><\/tr><tr><td>Recommended Export Quantity<\/td><td>Full 20GP container (~26 tons)<\/td><\/tr><tr><td>MOQ<\/td><td>5 tons<\/td><\/tr><tr><td>Lead Time (With Ingot Stock)<\/td><td>Approx. 20 days<\/td><\/tr><tr><td>Lead Time (Fresh Melt)<\/td><td>30\u201345 days<\/td><\/tr><tr><td>Lead Time (ESR Grade)<\/td><td>Approx. 60 days<\/td><\/tr><tr><td>Inspection<\/td><td>In-house UT team + Third-party inspection available<\/td><\/tr><tr><td>Documentation<\/td><td>MTC (EN 10204 3.1) + UT Report<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-global-distributors-source-440c-from-aobo-steel\">Why Global Distributors Source 440C from Aobo Steel<\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<ul class=\"wp-block-list\">\n<li>Continuous monthly supply of around 1000 tons<\/li>\n\n\n\n<li>MOQ from 5 tons for wholesale orders<\/li>\n\n\n\n<li>Container-optimized bar and plate lengths<\/li>\n\n\n\n<li>Mixed sizes are supported for export loading<\/li>\n\n\n\n<li>Annealed delivery for downstream machining<\/li>\n\n\n\n<li>Stable sourcing through integrated supply chain partners<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<ul class=\"wp-block-list\">\n<li>UT inspection available to SEP 1921-82 D\/d or E\/e<\/li>\n\n\n\n<li>MTC and batch traceability with each shipment<\/li>\n\n\n\n<li>Heat number tracking for order control<\/li>\n\n\n\n<li>Black, turned, and polished surface options<\/li>\n\n\n\n<li>Bulk export packing for sea shipment<\/li>\n\n\n\n<li>Clear conversion path to the dedicated bulk supply page<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-434c7447 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<div class=\"wp-block-uagb-container uagb-block-b8bc3b23\">\n<h2 class=\"wp-block-heading has-text-align-left has-large-font-size\" id=\"h-stable-production-for-long-term-bulk-supply\">Stable Production for Long-Term Bulk Supply<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuous production cycles for inventory replenishment<\/li>\n\n\n\n<li>ESR (Electro-Slag Remelting) is available upon request<\/li>\n\n\n\n<li>Stable alloy sourcing to reduce supply interruption risk<\/li>\n\n\n\n<li>Full batch traceability linked to the original heat number<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Request a Volume Quote<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-3dfb5298\">\n<figure class=\"wp-block-image aligncenter size-large has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016-1024x576.avif\" alt=\"\" class=\"wp-image-12933\" style=\"border-top-left-radius:15px;border-top-right-radius:15px;border-bottom-left-radius:15px;border-bottom-right-radius:15px\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016-1024x576.avif 1024w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016-300x169.avif 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016-768x432.avif 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016-1536x864.avif 1536w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016-18x10.avif 18w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20171115_153016.avif 1860w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-122c03a6 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\" id=\"h-available-440c-stainless-steel-forms\">Available 440C Stainless Steel Forms<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"206\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/03\/dd399cbb-cb1f-40f8-8398-03acefc1a0cd-1024x206.avif\" alt=\"\" class=\"wp-image-13355\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/03\/dd399cbb-cb1f-40f8-8398-03acefc1a0cd-1024x206.avif 1024w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/03\/dd399cbb-cb1f-40f8-8398-03acefc1a0cd-300x60.avif 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/03\/dd399cbb-cb1f-40f8-8398-03acefc1a0cd-768x155.avif 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/03\/dd399cbb-cb1f-40f8-8398-03acefc1a0cd-18x4.avif 18w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/03\/dd399cbb-cb1f-40f8-8398-03acefc1a0cd.avif 1385w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-682a18af alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<div class=\"wp-block-uagb-container uagb-block-cba2949c\">\n<figure class=\"wp-block-image aligncenter size-full has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20221028_111745.avif\" alt=\"\" class=\"wp-image-13133\" style=\"border-top-left-radius:15px;border-top-right-radius:15px;border-bottom-left-radius:15px;border-bottom-right-radius:15px\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20221028_111745.avif 500w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20221028_111745-300x300.avif 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20221028_111745-150x150.avif 150w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/IMG_20221028_111745-12x12.avif 12w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-cf834837\">\n<h2 class=\"wp-block-heading has-large-font-size\" id=\"h-quality-control-for-bulk-orders\">Quality Control for Bulk Orders<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every batch of tool steel supplied by Aobo Steel is verified before shipment to ensure grade accuracy, internal soundness, and traceability for bulk orders.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chemical composition verified by a spectrometer<\/li>\n\n\n\n<li>Ultrasonic testing available (SEP 1921-82)<\/li>\n\n\n\n<li>Delivered in spheroidized annealed condition<\/li>\n\n\n\n<li>Mill Test Certificate (EN 10204 3.1) with heat number<\/li>\n\n\n\n<li>Dimensional and surface inspection before shipment<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Get 440C Bulk Supply Quote<\/a><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-0226a4d4 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<div class=\"wp-block-uagb-container uagb-block-66b1055b\">\n<h2 class=\"wp-block-heading has-large-font-size\" id=\"h-export-packaging-and-container-loading\">Export Packaging and Container Loading<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Professional seaworthy export packing<\/li>\n\n\n\n<li>20GP loading optimized up to ~26 tons<\/li>\n\n\n\n<li>Mixed grades and mixed sizes supported<\/li>\n\n\n\n<li>Anti-rust protection for long sea transit<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"h-\">For international shipments, full-container loading is strongly recommended to ensure cost efficiency and smoother customs processing.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Get a Full Container Load (FCL) Quote<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-52d8f3b6\">\n<figure class=\"wp-block-image aligncenter size-full has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/photobank-2.avif\" alt=\"\" class=\"wp-image-12935\" style=\"border-top-left-radius:15px;border-top-right-radius:15px;border-bottom-left-radius:15px;border-bottom-right-radius:15px\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/photobank-2.avif 1000w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/photobank-2-300x225.avif 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/photobank-2-768x576.avif 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/02\/photobank-2-16x12.avif 16w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\" id=\"1-eael-table-of-content\">1. Applications<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cutting Tools<\/li>\n\n\n\n<li>Bearings&nbsp;<\/li>\n\n\n\n<li>Plastic Mold Materials<\/li>\n\n\n\n<li>Valve Parts<\/li>\n\n\n\n<li>Gears, Shafts, Cams<\/li>\n\n\n\n<li>Surgical and Dental Instruments<\/li>\n\n\n\n<li>Springs<\/li>\n\n\n\n<li>Medical Applications<\/li>\n\n\n\n<li>Wear-Resistant Applications<\/li>\n\n\n\n<li>Automotive Industry<\/li>\n\n\n\n<li>Hardware<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-eael-table-of-content\">2. 440C Stainless Steel Composition<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Carbon (C)<\/td><td>Chromium (Cr)<\/td><td>Manganese (Mn)<\/td><td>Silicon (Si)<\/td><td>Molybdenum (Mo)<\/td><td>Phosphorus (P)<\/td><td>Sulfur (S)<\/td><\/tr><tr><td>0.95 \u2013 1.20<\/td><td>16.0 \u2013 18.0<\/td><td>1.00 max<\/td><td>1.00 max<\/td><td>0.75 max<\/td><td>0.040 max<\/td><td>0.030 max<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-eael-table-of-content\">3. 440C Stainless Steel Properties<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-1-mechanical-properties\">3.1 Mechanical Properties<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Condition\/Type<\/th><th>Tensile Strength (ksi\/MPa)<\/th><th>Yield Strength (0.2% Offset) (ksi\/MPa)<\/th><th>Elongation in 2&#8243; \/ 50mm (%)<\/th><\/tr><tr><td><strong>Annealed<\/strong><\/td><td>110 ksi (758 MPa) (Min 110 ksi \/ 758 MPa for bar)<\/td><td>65 ksi (448 MPa) (Min 65 ksi \/ 448 MPa for bar)<\/td><td>14% (Min 14% for bar)<\/td><\/tr><tr><td><strong>Heat Treated \/ Hardened<\/strong><\/td><td>285 ksi (1965 MPa)<\/td><td>275 ksi (1896 MPa)<\/td><td>2%<\/td><\/tr><tr><td><strong>Cold Finished Bar<\/strong><\/td><td>Minimum 125 ksi (862 MPa)<\/td><td>Minimum 100 ksi (689 MPa)<\/td><td>Minimum 7%<\/td><\/tr><tr><td><strong>Annealed Wire<\/strong><\/td><td>Minimum 140 ksi (965 MPa)<\/td><td>&#8211;<\/td><td>Minimum 13%<\/td><\/tr><tr><td><strong>Cold Heading Wire<\/strong><\/td><td>Typical 110 ksi (760 MPa)<\/td><td>&#8211;<\/td><td>&#8211;<\/td><\/tr><tr><td><strong>Lightly Drafted Wire<\/strong><\/td><td>Typical 120 ksi (830 MPa)<\/td><td>&#8211;<\/td><td>&#8211;<\/td><\/tr><tr><td><strong>MIM (Metal Injection Molded) 440C<\/strong><\/td><td>876 MPa (after heat treatment)<\/td><td>&#8211;<\/td><td>&#8211;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-2-physical-amp-thermal-properties\">3.2 Physical &amp; Thermal Properties<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Property<\/th><th>Value<\/th><\/tr><tr><td><strong>Toughness (Heat Treated)<\/strong><\/td><td>5 ft-lb<\/td><\/tr><tr><td><strong>Modulus of Elasticity<\/strong><\/td><td>29 x 10^6 psi (Approx. 200 GPa)<\/td><\/tr><tr><td><strong>Specific Heat (32-212\u00b0F)<\/strong><\/td><td>0.11 Btu\/lb\u00b7\u00b0F<\/td><\/tr><tr><td><strong>Density<\/strong><\/td><td>Approx. 0.29 lb\/in^3 (8.02 g\/cm^3)<\/td><\/tr><tr><td><strong>Thermal Conductivity (20\u00b0C)<\/strong><\/td><td>29.3 W\/(m\u00b7K)<\/td><\/tr><tr><td><strong>Coefficient of Linear Thermal Expansion<\/strong><\/td><td>Approx. 10.5 x 10^-6 K^-1 (Over ranges: 20-100\u00b0C, 20-200\u00b0C, 20-300\u00b0C, 20-500\u00b0C)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"wp-block-columns has-ast-global-color-8-background-color has-background is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image alignfull size-full has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1862\" height=\"1862\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C.avif\" alt=\"\" class=\"wp-image-14785\" style=\"border-top-left-radius:15px;border-top-right-radius:15px;border-bottom-left-radius:15px;border-bottom-right-radius:15px\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C.avif 1862w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C-300x300.avif 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C-1024x1024.avif 1024w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C-150x150.avif 150w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C-768x768.avif 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C-1536x1536.avif 1536w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/04\/440C-12x12.avif 12w\" sizes=\"auto, (max-width: 1862px) 100vw, 1862px\" \/><figcaption class=\"wp-element-caption\">440C stainless steel<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-ast-global-color-0-color has-text-color has-link-color wp-elements-aa20d97342030218fbf4f1a9ade78b62 wp-block-paragraph\"><strong>Interested in 440C stainless steel?<\/strong> <strong>Please fill out the form below to contact us today!<\/strong><\/p>\n\n\n\n<div class=\"wp-block-leadin-hubspot-form-block\">\n\t\t\t\t\t\t<script>\n\t\t\t\t\t\t\twindow.hsFormsOnReady = window.hsFormsOnReady || [];\n\t\t\t\t\t\t\twindow.hsFormsOnReady.push(()=>{\n\t\t\t\t\t\t\t\thbspt.forms.create({\n\t\t\t\t\t\t\t\t\tportalId: 242461771,\n\t\t\t\t\t\t\t\t\tformId: \"1f7a4dcb-eb56-45e5-bd4f-5921cbf714c1\",\n\t\t\t\t\t\t\t\t\ttarget: \"#hbspt-form-1781065629000-8516788700\",\n\t\t\t\t\t\t\t\t\tregion: \"na2\",\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t})});\n\t\t\t\t\t\t<\/script>\n\t\t\t\t\t\t<div class=\"hbspt-form\" id=\"hbspt-form-1781065629000-8516788700\"><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-eael-table-of-content\">4. Heat treatment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The&nbsp;heat treating&nbsp;of 440C stainless steel, like other martensitic stainless steels, typically involves austenitizing,&nbsp;<em>quenching<\/em>, and tempering. The process aims to transform the steel into a martensitic microstructure, which is then tempered to optimize its balance of hardness, strength, ductility, and corrosion resistance.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-eael-table-of-content\">4.1&nbsp;Austenitizing(hardening)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The austenitizing temperature is&nbsp;925 to 1065 \u00b0C (1700 to 1950 \u00b0F). We recommend 1038\u00b0C (1900\u00b0F)&nbsp;because we believe it provides the best hardness and corrosion resistance. Additionally, we suggest preheating the material to&nbsp;650\u00b0C (1200\u00b0F)&nbsp;before this step to minimize distortion, warping, or cracking from high thermal gradients during rapid heating or quenching. Soaking time&nbsp;should be sufficient to ensure carbides dissolve into the&nbsp;austenite, which can be slower than in plain carbon steels due to the presence of chromium.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-eael-table-of-content\">4.2&nbsp;Quenching<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Following austenitizing, 440C steel is typically quenched in&nbsp;air or oil.&nbsp;Oil quenching at temperatures such as 1038\u00b0C (1900\u00b0F) or 1040\u00b0C (1900\u00b0F) is a common choice.&nbsp;After quenching, the steel transforms into martensite, a hard yet brittle structure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-eael-table-of-content\">4.3&nbsp;Tempering<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The step following quenching is tempering, which aims to reduce hardness, enhance toughness and ductility, and relieve internal stress.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The tempering temperature is&nbsp;<strong>392\u00b0F to 662\u00b0F (200\u00b0C to 350\u00b0C)<\/strong>. Different tempering temperatures result in varying hardness levels, as follows:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Temperature (\u00b0C)<\/td><td>Temperature (\u00b0F)<\/td><td>Hardness (HRC)<\/td><\/tr><tr><td>150<\/td><td>300<\/td><td>60<\/td><\/tr><tr><td>315<\/td><td>600<\/td><td>57<\/td><\/tr><tr><td>425<\/td><td>800<\/td><td>58<\/td><\/tr><tr><td>480<\/td><td>900<\/td><td>57<\/td><\/tr><tr><td>540<\/td><td>1000<\/td><td>55<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">It should be noted that tempering 440C stainless steel and similar high-carbon martensitic stainless steels in the range of&nbsp;427 \u00b0C to 566 \u00b0C (800 \u00b0F to 1050 \u00b0F)&nbsp;will result in temper brittleness and reduced impact strength and corrosion resistance.<br>If tempering outside the aforementioned temperature range is necessary to enhance toughness, we recommend a tempering temperature of&nbsp;593\u00b0C (1100\u00b0F)&nbsp;or higher. Tempering at this temperature improves impact strength and corrosion resistance but sacrifices some hardness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"8-eael-table-of-content\">4.4 Special Considerations in 440C Steel Heat Treatment<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Preheating:<\/strong>&nbsp;Before the main hardening(austenitizing) process, we suggest preheating 440C stainless steel to approximately&nbsp;650\u00b0C (1200\u00b0F). This helps to ensure a more uniform temperature distribution and minimize thermal shock during the subsequent austenitizing stage.<\/li>\n\n\n\n<li><strong>Slow Cooling After Forging:<\/strong>&nbsp;For high-carbon steels such as 440C, we recommend slow cooling after forging, or intermittent cooling, which involves cooling to 150-250\u00b0C, reheating to approximately 650\u00b0C, and then final cooling. This helps prevent cracking and the formation of grain boundary carbides.<\/li>\n\n\n\n<li><strong>Managing Retained Austenite:<\/strong>&nbsp;As-quenched 440C steel can sometimes contain a significant amount of retained austenite (potentially 20-30% by volume). If not addressed, this retained austenite can transform spontaneously over time, leading to dimensional changes and an increased risk of cracking.&nbsp;Performing a subzero cold treatment after quenching can effectively transform this retained austenite into untempered martensite. This cold treatment must be followed by at least one standard tempering cycle to temper the newly formed martensite and relieve internal stresses.<\/li>\n\n\n\n<li><strong>Post-Weld Heat Treatment (PWHT):<\/strong>&nbsp;For welded 440C components, PWHT is almost always necessary. This treatment serves to temper the martensite formed in the weld and heat-affected zone and to relieve residual stresses.&nbsp;The PWHT temperature range for 440C is&nbsp;480\u00b0C to 750\u00b0C (895\u00b0F to 1380\u00b0F).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"9-eael-table-of-content\">5. Equivalent Grades<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DIN EN (Europe):<\/strong>&nbsp;1.4125 (X105CrMo17)<\/li>\n\n\n\n<li><strong>JIS (Japan):<\/strong>&nbsp;SUS440C<\/li>\n\n\n\n<li><strong>ISO:<\/strong>&nbsp;X105CrMo17<\/li>\n\n\n\n<li><strong>GB (China):<\/strong>&nbsp;<em>9Cr18Mo<\/em>&nbsp;or&nbsp;<em>95Cr18<\/em><\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Request 440C Bulk Quote<\/a><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>440C stainless steel is a high-carbon, high-chromium martensitic stainless steel.&nbsp;It belongs to the 400 series of stainless steels, which are generally magnetic.&nbsp;In the medical field, 440C steel is widely used for manufacturing surgical knives and other medical instruments. It is also used in industry to manufacture corrosion-resistant plastic and rubber molds.&nbsp; 440C Stainless Steel Supply [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":14803,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"landing-page","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"[]"},"class_list":["post-9293","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>440C Stainless Steel (1.4125 \/ SUS440C) Supplier | Round Bar &amp; Plate Bulk Supply<\/title>\n<meta name=\"description\" content=\"Supply 440C stainless steel (1.4125 \/ SUS440C) in round bar and plate. 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