{"id":9433,"date":"2025-08-03T15:47:13","date_gmt":"2025-08-03T07:47:13","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=9433"},"modified":"2026-04-25T23:57:50","modified_gmt":"2026-04-25T15:57:50","slug":"s7-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/s7-tool-steel\/","title":{"rendered":"AISI S7 Tool Steel Supplier | DIN 1.2355 | Bulk Shock-Resisting Tool Steel"},"content":{"rendered":"<div class=\"wp-block-cover alignfull\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"337\" class=\"wp-block-cover__image-background wp-image-7233 size-large\" alt=\"\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-1024x337.webp\" data-object-fit=\"cover\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-1024x337.webp 1024w, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3-300x99.webp 300w, 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, https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/05\/banner3.webp 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><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-container uagb-block-29fc5c3c alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<div class=\"wp-block-uagb-advanced-heading uagb-block-c196a237\"><h6 class=\"uagb-heading-text\"><a href=\"https:\/\/aobosteel.com\/ko\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">Home<\/mark> <\/a>&gt; <a href=\"https:\/\/aobosteel.com\/ko\/tool-steels\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">Tool Steel Catalog<\/mark><u> <\/u><\/a>&gt; S7 Tool Steel<\/h6><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-d1ce38c5\"><h5 class=\"uagb-heading-text\"><em>Aobo Steel | Global Tool Steel Supplier in China<\/em><\/h5><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-5b6189ba\"><h1 class=\"uagb-heading-text\">AISI S7 Tool Steel Supplier | DIN 1.2355 | Bulk Shock-Resisting Tool Steel<\/h1><p class=\"uagb-desc-text\">Reliable Bulk Supply of Annealed S7 for Impact-Resistant Tooling Applications<\/p><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-914bcd03\"><h5 class=\"uagb-heading-text\">\u2713100% UT Tested (SEP 1921-82 Class D\/d)<\/h5><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-84cd4af9\"><h5 class=\"uagb-heading-text\">\u2713Delivered in Fully Annealed Condition<\/h5><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-20e20150\"><h5 class=\"uagb-heading-text\">\u2713MOQ 5 Tons | FCL Recommended (~26 Tons)<\/h5><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-33ee52f8\"><h5 class=\"uagb-heading-text\">\u2713Round Bar \/ Flat Bar \/ Forged Block<\/h5><\/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\">Request S7 Bulk Quote<\/a><\/div>\n\n\n\n<div class=\"wp-block-button hs-cta-trigger-button hs-cta-trigger-button-230288465624 is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link has-ast-global-color-4-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/ko\/distributors\/\" style=\"background-color:#ffffff00\">Explore Our Distributor Supply Structure<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-90b1aa86 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<p class=\"wp-block-paragraph\">S7 tool steel is a shock-resisting tool steel classified in the \u201cS\u201d series under the AISI system. It is designed for applications exposed to high impact and repeated shock loading. International equivalents include UNS T41907, DIN 1.2355 (50CrMoV13-15), JIS SKS93, and the Chinese grade 5Cr3Mn1SiMo1V.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-8d34a8d1 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\" id=\"h-supply-overview\">Supply Overview<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Item<\/th><th>Details<\/th><\/tr><\/thead><tbody><tr><td>Grade<\/td><td>AISI S7 \/ DIN 1.2355<\/td><\/tr><tr><td>Delivery Condition<\/td><td>Fully Annealed (Soft Machining Condition)<\/td><\/tr><tr><td>Available Forms<\/td><td>Round Bar \/ Flat Bar \/ Forged Block<\/td><\/tr><tr><td>Monthly Output<\/td><td>Stable rolling production for distributor replenishment<\/td><\/tr><tr><td>Recommended Export Model<\/td><td>Full 20GP container (~26 tons)<\/td><\/tr><tr><td>MOQ<\/td><td>5 tons<\/td><\/tr><tr><td>Lead Time (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>EN 10204 3.1 MTC + UT report<\/td><\/tr><\/tbody><\/table><\/figure>\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-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"h-supply-stability-for-distributor-inventory\">Supply Stability for Distributor Inventory<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuous production cycle to support repeat container shipments<\/li>\n\n\n\n<li>Stable alloy sourcing to reduce raw material price fluctuation risk<\/li>\n\n\n\n<li>ESR grade available upon request for premium market positioning<\/li>\n\n\n\n<li>Full batch traceability linked to the original heat number<\/li>\n\n\n\n<li>Dedicated inspection before shipment<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-3e41869c 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 Bulk S7 Supply Plan<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><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\" 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>\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<figure class=\"wp-block-image aligncenter size-full\"><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\" 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\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\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-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"h-packaging-and-shipping\">Packaging and Shipping<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seaworthy wooden packing with anti-rust protection<\/li>\n\n\n\n<li>20GP loading optimized up to ~26 tons<\/li>\n\n\n\n<li>Mixed sizes and mixed items allowed within one container<\/li>\n\n\n\n<li>Container loading photos available before shipment<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"h-\">For international distributors, full-container shipments ensure better freight control and smoother customs clearance.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-3e41869c 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 S7 Full Container Quote<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-b959c99c alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<div class=\"wp-block-uagb-call-to-action uagb-block-5e88b53d wp-block-button\"><div class=\"uagb-cta__wrap\"><h3 class=\"uagb-cta__title\">Quality Assurance for Bulk Orders<\/h3><p class=\"uagb-cta__desc\">For distributors and stockists, consistency and traceability matter. See how Aobo Steel verifies chemistry, microstructure, UT (upon request), delivered hardness, and batch traceability before shipment.<br><a href=\"https:\/\/web-sandbox.oaiusercontent.com\/tool-steel-quality-verification\/\"><\/a><\/p><\/div><div class=\"uagb-cta__buttons\"><a href=\"https:\/\/aobosteel.com\/ko\/tool-steel-quality-verification\/\" class=\"uagb-cta__button-link-wrapper wp-block-button__link\" target=\"_self\" rel=\"noopener noreferrer\">View Quality Verification Guide<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\"><path d=\"M504.3 273.6l-112.1 104c-6.992 6.484-17.18 8.218-25.94 4.406c-8.758-3.812-14.42-12.45-14.42-21.1L351.9 288H32C14.33 288 .0002 273.7 .0002 255.1S14.33 224 32 224h319.9l0-72c0-9.547 5.66-18.19 14.42-22c8.754-3.809 18.95-2.075 25.94 4.41l112.1 104C514.6 247.9 514.6 264.1 504.3 273.6z\"><\/path><\/svg><\/a><\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-6f0fb057 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\" id=\"1-eael-table-of-content\">S7 Tool Steel Applications<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Punches<\/li>\n\n\n\n<li>Blanking Dies<\/li>\n\n\n\n<li>Cold Forming Dies<\/li>\n\n\n\n<li>Coining Dies<\/li>\n\n\n\n<li>Mandrels<\/li>\n\n\n\n<li>Structural Component Parts<\/li>\n\n\n\n<li>Trimming Dies<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-65bddb50 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\" id=\"2-eael-table-of-content\">S7 Steel Composition<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Carbon<\/td><td>Manganese<\/td><td>Silicon<\/td><td>Chromium<\/td><td>Molybdenum<\/td><td>Vanadium<\/td><\/tr><tr><td>0.45 \u2013 0.55%<\/td><td>0.20 \u2013 0.90%<\/td><td>0.20 \u2013 1.00%<\/td><td>3.00 \u2013 3.50%<\/td><td>1.30 \u2013 1.80%<\/td><td>0.20 \u2013 0.35%<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-bc240b50 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\" id=\"3-eael-table-of-content\">Properties<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-eael-table-of-content\">Physical Properties<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Density<\/td><td>7.80\u22127.83&nbsp;g\/cm3<\/td><\/tr><tr><td>Specific Gravity<\/td><td>7.83<\/td><\/tr><tr><td>Modulus of Elasticity<\/td><td>205\u2212207&nbsp;GPa<\/td><\/tr><tr><td>Thermal Conductivity<\/td><td>28.5&nbsp;W\/(m\u22c5K)&nbsp;(at&nbsp;95\u2218C)<\/td><\/tr><tr><td colspan=\"2\">Thermal Expansion (Linear)<\/td><\/tr><tr><td>20\u2212100\u2218C<\/td><td>12.5&nbsp;\u03bcm\/(m\u22c5K)<\/td><\/tr><tr><td>20\u2212250\u2218C<\/td><td>13.3&nbsp;\u03bcm\/(m\u22c5K)<\/td><\/tr><tr><td>20\u2212500\u2218C<\/td><td>14.27&nbsp;\u03bcm\/(m\u22c5K)<\/td><\/tr><tr><td>Specific Heat Capacity<\/td><td>\u223c0.46&nbsp;J\/(g\u22c5K)<\/td><\/tr><tr><td>Electrical Resistivity<\/td><td>\u223c0.75&nbsp;\u03bc\u03a9\u22c5m<\/td><\/tr><tr><td>Critical Temperature (Ac1)<\/td><td>793\u2218C<\/td><\/tr><tr><td>Critical Temperature (Ac3)<\/td><td>838\u2218C<\/td><\/tr><tr><td>Transformation Temperature<\/td><td>785\u2212800\u2218C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-eael-table-of-content\">Mechanical Properties<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Tensile Strength<\/td><td>\u223c1517\u22122151&nbsp;MPa<\/td><\/tr><tr><td>Yield Strength<\/td><td>\u223c1310\u22121999&nbsp;MPa<\/td><\/tr><tr><td>Hardness (Annealed)<\/td><td>Max&nbsp;223\u2212250&nbsp;HBW<\/td><\/tr><tr><td>Hardness (Heat Treated)<\/td><td>Up to&nbsp;60\u221261&nbsp;HRC<\/td><\/tr><tr><td>Hardness (Tempering Range)<\/td><td>45\u221257&nbsp;HRC&nbsp;(depending on temp)<\/td><\/tr><tr><td>Elongation at Break<\/td><td>\u223c7\u221215%<\/td><\/tr><tr><td>Poisson\u2019s Ratio<\/td><td>0.27\u22120.30<\/td><\/tr><tr><td>Modulus of Elasticity<\/td><td>207&nbsp;GPa<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-eael-table-of-content\">Other Properties<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shock Resistance:&nbsp;Very high, a primary and defining characteristic of S7.<\/li>\n\n\n\n<li>Wear\u00a0Resistance:\u00a0Good, though generally lower than high-carbon, high-chromium cold-worked steels like O6 or\u00a0D2 tool steel.<\/li>\n\n\n\n<li>Dimensional Stability:\u00a0Good stability throughout the correct\u00a0<em>heat-treating<\/em>\u00a0process. Dimensional growth of +0.001 inches per inch (0.001 mm per mm) when S7 is air quenched from the correct hardening temperature.<\/li>\n\n\n\n<li>Air Hardening Benefit:&nbsp;S7&#8217;s air-hardening capability provides a significant margin of safety during hardening, reducing the risk of distortion and cracking compared to liquid-quenching steels.<\/li>\n\n\n\n<li>Elevated Temperature Performance:&nbsp;S7 exhibits good resistance to softening at moderately elevated temperatures, making it suitable for medium-temperature hot work applications.<\/li>\n\n\n\n<li>Surface Hardening:\u00a0Through processes such as carbonitriding or nitriding, the surface hardness of S7 tool steel can be further improved to approximately 64 HRC. However, such surface treatments can affect S7 steel\u2019s inherent shock resistance and should be carefully considered based on application requirements.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-747077a0 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h2 class=\"wp-block-heading\">Heat Treatment of S7 Tool Steel<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S7 is an air-hardening shock-resisting tool steel designed to maintain high toughness under impact loading. Typical heat treatment parameters are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Preheating: 650\u2013700 \u00b0C<\/li>\n\n\n\n<li>Austenitizing: 925\u2013955 \u00b0C<\/li>\n\n\n\n<li>Quenching: Air cooling<\/li>\n\n\n\n<li>Tempering: 200\u2013540 \u00b0C (double tempering recommended)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">After proper heat treatment, S7 typically achieves a hardness range of 54\u201358 HRC, depending on section size and tempering temperature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For detailed temperature charts, soaking times, and practical recommendations, please refer to our dedicated <a href=\"https:\/\/aobosteel.com\/ko\/s7-tool-steel-heat-treatment\/\">S7 Heat Treatment Guide<\/a>.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-69f93732 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\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\">Open RRQ Form<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\\\/\",\n    \"@type\": \"Product\",\n    \"name\": \"Forged S7 \\\/ 1.2355 Shock Resisting Tool Steel Round Bar\",\n    \"image\": \"https:\\\/\\\/aobosteel.com\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/S7.webp\",\n    \"description\": \"Premium Forged S7 (1.2355) Shock Resisting Tool Steel directly from Aobo Steel factory. Superior toughness combined with high wear resistance. Ideal for heavy-duty impact tools. 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It is designed for applications exposed to high impact and repeated shock loading. International equivalents include UNS T41907, DIN 1.2355 (50CrMoV13-15), JIS SKS93, and the Chinese grade 5Cr3Mn1SiMo1V. 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