{"id":15684,"date":"2026-05-27T11:39:55","date_gmt":"2026-05-27T03:39:55","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=15684"},"modified":"2026-06-08T10:05:57","modified_gmt":"2026-06-08T02:05:57","slug":"d2-vs-s7-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/d2-vs-s7-tool-steel\/","title":{"rendered":"D2 vs S7 Tool Steel: Wear Resistance or Impact Toughness?"},"content":{"rendered":"<section class=\"aobo-d2-s7-page\">\n  <style>\n    .aobo-d2-s7-page {\n      --aobo-blue: #0c56d0;\n      --aobo-blue-dark: #073b8e;\n      --aobo-blue-soft: #eaf2ff;\n      --aobo-blue-line: #c9dcff;\n      --aobo-border: #d7e5fb;\n      --aobo-text: #203044;\n      --aobo-muted: #617087;\n      --aobo-orange: #f59b23;\n      --aobo-white: #ffffff;\n      --aobo-shadow: 0 18px 45px rgba(12, 86, 208, 0.10);\n      --aobo-page-width: 1180px;\n      --aobo-copy-width: 920px;\n      font-family: Arial, Helvetica, sans-serif;\n      color: var(--aobo-text);\n      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It is selected when abrasive wear, edge retention, and dimensional stability are the main requirements. S7 is a shock-resisting tool steel. It is selected when impact load, chipping, cracking, or sudden breakage is the main risk.<\/p>\n      <p>Choose D2 when the tool wears out before it breaks. Choose S7 when the tool chips, cracks, or breaks before it wears out.<\/p>\n    <\/header>\n\n    <section class=\"aobo-product-strip\" aria-label=\"D2 and S7 tool steel products from Aobo Steel\">\n      <h2>D2 and S7 Tool Steel Available from Aobo Steel<\/h2>\n      <p class=\"aobo-strip-intro\">Aobo Steel supplies D2 cold-work tool steel and S7 shock-resisting tool steel for tooling applications where wear resistance, edge life, impact toughness, or crack resistance controls performance.<\/p>\n\n      <div class=\"aobo-product-grid\">\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/01\/D2-steel.avif\" alt=\"D2 tool steel supplied by Aobo Steel\" loading=\"lazy\">\n          <\/div>\n          <h3>D2 | 1.2379 | SKD11<\/h3>\n          <p class=\"aobo-card-note\">High-carbon, high-chromium cold-work tool steel for abrasive wear, edge retention, long cutting life, precision dies, slitting cutters, and wear-dominated tooling.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/d2-tool-steel\/\">View Details<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry hs-cta-trigger-button hs-cta-trigger-button-230288465624\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n          <\/div>\n        <\/article>\n\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/04\/S7.webp\" alt=\"S7 tool steel supplied by Aobo Steel\" loading=\"lazy\">\n          <\/div>\n          <h3>S7 | 1.2355<\/h3>\n          <p class=\"aobo-card-note\">Shock-resisting tool steel for impact punches, chisels, heavy-duty shear blades, breaker tools, rivet sets, and tools prone to chipping, cracking, or breakage.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/s7-tool-steel\/\">View Details<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry hs-cta-trigger-button hs-cta-trigger-button-230288465624\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n          <\/div>\n        <\/article>\n      <\/div>\n    <\/section>\n\n    <main class=\"aobo-article\">\n      <h2>D2 vs S7 Quick Selection Guide<\/h2>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Main Requirement<\/th><th>Better Choice<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Abrasive wear resistance<\/td><td>D2<\/td><\/tr>\n            <tr><td>Long cutting edge life<\/td><td>D2<\/td><\/tr>\n            <tr><td>High working hardness<\/td><td>D2<\/td><\/tr>\n            <tr><td>Dimensional stability in cold-work tooling<\/td><td>D2<\/td><\/tr>\n            <tr><td>Impact toughness<\/td><td>S7<\/td><\/tr>\n            <tr><td>Resistance to chipping and cracking<\/td><td>S7<\/td><\/tr>\n            <tr><td>Shock-loaded tooling<\/td><td>S7<\/td><\/tr>\n            <tr><td>Tough core with moderate wear resistance<\/td><td>S7<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Chemical Composition Comparison<\/h2>\n      <p>D2 uses high carbon and high chromium to form a large volume of hard carbides. S7 uses lower carbon and moderate alloy content to keep the steel tougher under impact load.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Element<\/th><th>D2 Tool Steel<\/th><th>S7 Tool Steel<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Carbon<\/td><td>1.50&ndash;1.60%<\/td><td>0.45&ndash;0.55%<\/td><\/tr>\n            <tr><td>Chromium<\/td><td>11.00&ndash;12.05%<\/td><td>3.00&ndash;3.50%<\/td><\/tr>\n            <tr><td>Molybdenum<\/td><td>0.70&ndash;1.20%<\/td><td>1.30&ndash;1.80%<\/td><\/tr>\n            <tr><td>Vanadium<\/td><td>0.25&ndash;1.00%<\/td><td>Usually 0.20&ndash;0.30%<\/td><\/tr>\n            <tr><td>Silicon<\/td><td>Around 0.30%<\/td><td>0.20&ndash;1.00%<\/td><\/tr>\n            <tr><td>Manganese<\/td><td>Around 0.30%<\/td><td>0.20&ndash;0.90%<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>The largest differences are carbon and chromium. D2 has roughly three times the carbon content of S7 and more than three times the chromium content. This chemistry gives D2 a carbide-rich structure.<\/p>\n      <p>S7 keeps carbon much lower and uses a more balanced alloy system. Its higher molybdenum content also helps hardenability and resistance to softening at moderately elevated temperatures.<\/p>\n\n      <h2>Equivalent Grades Comparison<\/h2>\n      <p>D2 has many recognized equivalents because it is widely used in international cold work tool steel standards. S7 has fewer direct international equivalents and is usually specified by its AISI or UNS designation.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Standard<\/th><th>D2 Tool Steel<\/th><th>S7 Tool Steel<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>AISI \/ SAE<\/td><td>D2<\/td><td>S7<\/td><\/tr>\n            <tr><td>UNS<\/td><td>T30402<\/td><td>T41907<\/td><\/tr>\n            <tr><td>DIN \/ W.Nr.<\/td><td>1.2379<\/td><td>&#8211;<\/td><\/tr>\n            <tr><td>JIS<\/td><td>SKD11<\/td><td>&#8211;<\/td><\/tr>\n            <tr><td>BS<\/td><td>BD2 \/ 4659 BD2<\/td><td>&#8211;<\/td><\/tr>\n            <tr><td>AFNOR<\/td><td>Z160CDV12<\/td><td>&#8211;<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>For international purchasing, D2 is commonly ordered as AISI D2, 1.2379, or SKD11. S7 is usually ordered directly as AISI S7 or UNS T41907.<\/p>\n\n      <h2>Properties Comparison<\/h2>\n      <p>D2 and S7 should not be compared solely on the basis of hardness. D2 normally works at higher hardness and gives better wear resistance. S7 has slightly lower hardness but offers much better impact toughness.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Property<\/th><th>D2 Tool Steel<\/th><th>S7 Tool Steel<\/th><th>Selection Meaning<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Typical working hardness<\/td><td>58&ndash;60 HRC for many cold-work applications<\/td><td>56&ndash;58 HRC for shock-resisting applications<\/td><td>D2 normally works harder. S7 balances hardness with toughness.<\/td><\/tr>\n            <tr><td>As-quenched hardness<\/td><td>About 61&ndash;63 HRC<\/td><td>Depends on section size and quench condition<\/td><td>D2 reaches very high hardness after air quenching.<\/td><\/tr>\n            <tr><td>Wear resistance<\/td><td>High<\/td><td>Moderate<\/td><td>D2 is better for abrasive wear and long edge life.<\/td><\/tr>\n            <tr><td>Toughness<\/td><td>Fair compared with S7<\/td><td>High<\/td><td>S7 is better when tools chip, crack, or break.<\/td><\/tr>\n            <tr><td>Machinability<\/td><td>About 45, sometimes listed up to 65 depending on condition<\/td><td>About 70<\/td><td>S7 is easier to machine in the annealed condition.<\/td><\/tr>\n            <tr><td>Dimensional stability<\/td><td>Very good<\/td><td>Good<\/td><td>Both are air-hardening steels, but D2 usually shows lower movement.<\/td><\/tr>\n            <tr><td>Typical size change in hardening<\/td><td>About 0.0005 in.\/in.<\/td><td>About 0.001 in.\/in.<\/td><td>D2 has an advantage where dimensional control is critical.<\/td><\/tr>\n            <tr><td>Compressive strength<\/td><td>Higher<\/td><td>Lower than D2<\/td><td>D2 is better for high-pressure cold-work dies when impact is controlled.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>D2&rsquo;s high carbide content improves wear resistance but reduces toughness. Overall control matters because heat treatment, edge geometry, surface finish, and support conditions all affect tool reliability.<\/p>\n      <p>S7 contains fewer large carbides, so it absorbs impact better. It is easier to machine in the annealed condition and is more forgiving of tools subjected to shock loads or stress concentrations. D2 usually has the advantage when precision and minimum movement are critical.<\/p>\n\n      <h2>Heat Treatment Differences<\/h2>\n      <p>D2 and S7 are both air-hardening tool steels, but their heat-treatment targets differ. S7 heat treatment focuses on toughness with sufficient hardness for service.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Heat Treatment Factor<\/th><th>D2 Tool Steel<\/th><th>S7 Tool Steel<\/th><th>Practical Impact<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Preheating<\/td><td>1200&ndash;1300&deg;F \/ 650&ndash;705&deg;C<\/td><td>1200&ndash;1300&deg;F \/ 650&ndash;705&deg;C<\/td><td>Both grades need controlled heating before hardening.<\/td><\/tr>\n            <tr><td>Austenitizing temperature<\/td><td>Around 1850&deg;F \/ 1010&deg;C<\/td><td>Around 1725&deg;F \/ 940&deg;C<\/td><td>D2 needs a higher hardening temperature because of its higher alloy and carbide content.<\/td><\/tr>\n            <tr><td>Air-hardening section size<\/td><td>Up to about 5 in. \/ 127 mm<\/td><td>Up to about 2.5 in. \/ 63.5 mm<\/td><td>D2 has stronger deep-hardening ability in larger sections.<\/td><\/tr>\n            <tr><td>Common cold-work tempering direction<\/td><td>High-temperature double tempering, often around 900&ndash;960&deg;F \/ 480&ndash;515&deg;C<\/td><td>Lower-temperature double tempering, often around 425&ndash;450&deg;F \/ 220&ndash;230&deg;C<\/td><td>D2 targets wear resistance. S7 targets shock resistance.<\/td><\/tr>\n            <tr><td>Typical working hardness<\/td><td>58&ndash;60 HRC<\/td><td>56&ndash;58 HRC<\/td><td>D2 usually works harder. S7 keeps more toughness.<\/td><\/tr>\n            <tr><td>Annealing temperature<\/td><td>About 1650&deg;F \/ 899&deg;C<\/td><td>About 1550&deg;F \/ 843&deg;C<\/td><td>D2 requires a higher annealing temperature.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>D2 requires a higher austenitizing temperature than S7. The hardening window should be carefully controlled because overheating can reduce toughness and increase the risk of cracking. Large sections may need faster quenching to reach full hardness.<\/p>\n      <p>The tempering strategy also differs. D2 is usually tempered to maintain high wear resistance and working hardness. S7 is tempered to keep a better balance between hardness and impact toughness. For hot-work or hot-shear use, S7 may require higher tempering temperatures depending on the tool&rsquo;s working temperature.<\/p>\n      <p>For users and tool designers, the key point is not the full heat treatment procedure. The key point is how heat treatment affects final hardness, toughness, size change, and section-size suitability.<\/p>\n\n      <h2>Typical Applications<\/h2>\n      <p>D2 and S7 can appear in similar tool categories, but they are selected for different working conditions. D2 is common in cold-work tools that need long wear life. S7 is common in tools exposed to impact or shock load.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Application<\/th><th>Common Choice<\/th><th>Reason<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Long-run blanking dies<\/td><td>D2<\/td><td>High wear resistance and edge retention<\/td><\/tr>\n            <tr><td>Stamping dies for thin sheet<\/td><td>D2<\/td><td>Good dimensional stability and long tool life<\/td><\/tr>\n            <tr><td>Forming dies under controlled impact<\/td><td>D2<\/td><td>Good wear resistance and compressive strength<\/td><\/tr>\n            <tr><td>Slitting cutters<\/td><td>D2<\/td><td>Better cutting edge retention<\/td><\/tr>\n            <tr><td>Wear plates<\/td><td>D2<\/td><td>Better abrasive wear resistance<\/td><\/tr>\n            <tr><td>Precision gauges<\/td><td>D2<\/td><td>Low distortion during heat treatment<\/td><\/tr>\n            <tr><td>Impact punches<\/td><td>S7<\/td><td>Better resistance to shock and chipping<\/td><\/tr>\n            <tr><td>Chisels<\/td><td>S7<\/td><td>High impact toughness<\/td><\/tr>\n            <tr><td>Concrete breaker tools<\/td><td>S7<\/td><td>Shock-resisting steel design<\/td><\/tr>\n            <tr><td>Heavy-duty shear blades<\/td><td>S7<\/td><td>Better toughness under heavy impact<\/td><\/tr>\n            <tr><td>Hot punches and hot shear blades<\/td><td>S7<\/td><td>Better toughness and moderate hot strength<\/td><\/tr>\n            <tr><td>Plastic molding tools requiring high toughness<\/td><td>S7<\/td><td>Good toughness and polishability at suitable hardness<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>A punch used on a thin, clean sheet in a long production run may use D2 for edge life. A blade used for thick plate, heavy impact, or hot shearing may need S7.<\/p>\n      <p>D2 is also used for wear parts, plug gauges, ring gauges, slitting knives, and cold-work dies where size control and wear resistance are important. S7 is used for chisels, pneumatic tools, rivet sets, impact tools, heavy-duty punches, and selected hot-work tools.<\/p>\n\n      <h2>Failure Mode Selection Guide<\/h2>\n      <p>Failure mode is the clearest way to choose between D2 and S7. The material should match how the tool actually fails in service.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Service Failure Mode<\/th><th>Better Choice<\/th><th>Reason<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Abrasive wear<\/td><td>D2<\/td><td>Higher carbide volume improves wear resistance.<\/td><\/tr>\n            <tr><td>Edge rounding<\/td><td>D2<\/td><td>D2 keeps the working edge longer in abrasive contact.<\/td><\/tr>\n            <tr><td>Loss of dimensional accuracy by wear<\/td><td>D2<\/td><td>Better wear resistance helps maintain tool size.<\/td><\/tr>\n            <tr><td>Chipping<\/td><td>S7<\/td><td>Higher toughness reduces edge breakage.<\/td><\/tr>\n            <tr><td>Cracking under impact<\/td><td>S7<\/td><td>S7 absorbs shock load better.<\/td><\/tr>\n            <tr><td>Sudden breakage<\/td><td>S7<\/td><td>S7 is designed for shock-loaded tools.<\/td><\/tr>\n            <tr><td>Plastic deformation under high pressure<\/td><td>Usually D2 if impact is controlled<\/td><td>D2 normally works at higher hardness and compressive strength.<\/td><\/tr>\n            <tr><td>Heavy impact with moderate wear<\/td><td>S7<\/td><td>Toughness is more important than maximum wear resistance.<\/td><\/tr>\n            <tr><td>Severe wear with low impact<\/td><td>D2<\/td><td>Wear resistance is more important than maximum toughness.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>If a D2 tool chips or cracks before it wears out, the application likely needs more toughness. S7 is often the safer choice. If an S7 tool wears too quickly without chipping or cracking, the application may need greater wear resistance. D2 may work if the impact load is low enough.<\/p>\n\n      <h2>Final Selection Advice<\/h2>\n      <div class=\"aobo-choice-grid\">\n        <article class=\"aobo-choice-card\">\n          <h3>Choose D2 for wear-dominated tooling<\/h3>\n          <p>D2 is the stronger choice when abrasive wear, edge retention, high working hardness, compressive strength, and dimensional stability are the main requirements.<\/p>\n        <\/article>\n        <article class=\"aobo-choice-card\">\n          <h3>Choose S7 for shock-loaded tooling<\/h3>\n          <p>S7 is the safer choice when impact toughness, resistance to chipping, cracking, sudden breakage, or a tough core is more important than maximum wear resistance.<\/p>\n        <\/article>\n      <\/div>\n      <div class=\"aobo-note-box\">\n        <p>The simplest rule is this: choose D2 when the tool wears out before it breaks, and choose S7 when the tool chips, cracks, or breaks before it wears out.<\/p>\n      <\/div>\n\n      <section class=\"aobo-related-pages\" aria-label=\"Related D2 tool steel comparison pages\">\n        <h2>Related Pages<\/h2>\n        <div class=\"aobo-related-grid\">\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/d2-vs-m2-tool-steel\/\">\n            <strong>D2 vs M2<\/strong>\n            <span>Cold-work wear resistance versus high-speed cutting performance.<\/span>\n          <\/a>\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/d2-steel-vs-4140\/\">\n            <strong>D2 vs 4140<\/strong>\n            <span>Wear resistance versus toughness and lower cost.<\/span>\n          <\/a>\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/o1-vs-d2-tool-steel\/\">\n            <strong>D2 vs O1<\/strong>\n            <span>Air-hardening wear resistance versus easier-machining oil-hardening steel.<\/span>\n          <\/a>\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/d2-vs-a2-tool-steel\/\">\n            <strong>D2 vs A2<\/strong>\n            <span>Maximum wear life versus higher toughness in the same cold-work family.<\/span>\n          <\/a>\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/dc53-vs-d2-tool-steel\/\">\n            <strong>D2 vs DC53<\/strong>\n            <span>Standard D2 versus an upgraded grade with higher toughness and hardness.<\/span>\n          <\/a>\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/d2-vs-d3-tool-steel\/\">\n            <strong>D2 vs D3<\/strong>\n            <span>Higher wear resistance versus better dimensional stability and toughness.<\/span>\n          <\/a>\n          <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/ko\/d2-steel-vs-440c\/\">\n            <strong>D2 vs 440C<\/strong>\n            <span>Wear resistance versus a stainless grade with corrosion resistance.<\/span>\n          <\/a>\n        <\/div>\n      <\/section>\n    <\/main>\n\n    <section class=\"aobo-final-cta\">\n      <div>\n        <h2>Need D2 or S7 tool steel for your tooling application?<\/h2>\n        <p>Aobo Steel supplies D2 cold-work tool steel and S7 shock-resisting tool steel for dies, punches, blades, gauges, impact tools, wear parts, and shock-loaded tooling projects.<\/p>\n      <\/div>\n      <a class=\"aobo-btn hs-cta-trigger-button hs-cta-trigger-button-230288465624\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n    <\/section>\n  <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>Wear Resistance vs Shock Resistance D2 vs S7 Tool Steel D2 is a high-carbon, high-chromium cold work tool steel. It is selected when abrasive wear, edge retention, and dimensional stability are the main requirements. S7 is a shock-resisting tool steel. It is selected when impact load, chipping, cracking, or sudden breakage is the main risk. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15685,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"normal-width-container","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-15684","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>D2 vs S7 Tool Steel: Wear Resistance or Impact Toughness? - AoboSteel<\/title>\n<meta name=\"description\" content=\"Compare D2 and S7 tool steel by composition, equivalent grades, properties, heat treatment, applications, and failure modes. 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