{"id":15477,"date":"2026-05-16T16:03:18","date_gmt":"2026-05-16T08:03:18","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=15477"},"modified":"2026-09-29T22:50:37","modified_gmt":"2026-09-29T14:50:37","slug":"tool-steel-for-die-casting-dies-inserts","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/tool-steel-for-die-casting-dies-inserts\/","title":{"rendered":"Acero para herramientas para moldes y insertos de fundici\u00f3n a presi\u00f3n"},"content":{"rendered":"\n<section class=\"aobo-selection-page\">\n  <style>\n    .aobo-selection-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      font-family: Arial, Helvetica, sans-serif;\n      color: var(--aobo-text);\n  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display: inline-block;\n      font-size: 12px;\n      font-weight: 800;\n      color: var(--aobo-orange);\n      background: #fff7ed;\n      border: 1px solid #fde3bd;\n      border-radius: 999px;\n      padding: 6px 12px;\n      margin-bottom: 16px;\n      width: fit-content;\n      text-transform: uppercase;\n      letter-spacing: 0.06em;\n    }\n\n    .aobo-card p {\n      font-size: 14.5px;\n      line-height: 1.55;\n      color: var(--aobo-muted);\n      margin: 0 0 16px;\n    }\n\n    .aobo-reason {\n      background: #fbfdff;\n      border: 1px solid var(--aobo-border);\n      border-left: 4px solid var(--aobo-orange);\n      padding: 12px 14px;\n      border-radius: 10px;\n      margin-bottom: 20px;\n      font-size: 14.5px;\n      line-height: 1.6;\n      color: #314158;\n    }\n\n    .aobo-buttons {\n      display: flex;\n      gap: 10px;\n      margin-top: auto;\n    }\n\n    .aobo-btn {\n      text-decoration: none;\n      text-align: center;\n      font-weight: 700;\n      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!important;text-transform: none !important}@media (max-width: 760px){.entry-content[class] h1{font-size: clamp(22px,6.4vw,min(34px,var(--h1-max,34px))) !important}.entry-content[class] h2{font-size: 25px !important}.entry-content[class] h3{font-size: 20px !important}.entry-content[class] h4{font-size: 17px !important}.entry-content[class] p,.entry-content[class] li{font-size: 16px !important}.entry-content[class] table th,.entry-content[class] table td{font-size: 14px !important;padding: 11px 12px !important}.entry-content[class] .aobo-hero{padding: 30px 22px}.entry-content[class] .aobo-final-cta{padding: 26px 22px}.entry-content[class] .aobo-final-cta .aobo-btn{width: 100%}}\n<\/style>\n\n  <div class=\"aobo-container\">\n\n    <div class=\"aobo-hero\">\n      <h1 style=\"--h1-max:36px\">Tool Steel Selection for Die Casting Dies &amp; Inserts<\/h1>\n      <p>\n        Select tool steel by casting alloy, molten metal temperature, heat checking resistance, hot hardness, erosion resistance, and toughness requirement.\n        For die casting dies and inserts, the main choice is usually between thermal fatigue resistance, hot strength, erosion resistance, and resistance to cracking.\n      <\/p>\n    <\/div>\n\n    <div class=\"aobo-section-title\">\n      <h2>How Die-Casting Dies Fail<\/h2>\n      <p>\n        Die damage is not random. It develops from the heat cycle, the injection pressure and the contact with the molten alloy, and which mechanism becomes dominant decides which steel property matters.\n      <\/p>\n    <\/div>\n\n    <div class=\"aobo-prose\">\n      <p>\n        In each casting cycle the die surface is heated by the molten metal and then cooled again, so the surface works under cyclic thermal stress. Heat checking, a network of surface cracks, is the result. High injection pressure and fast metal flow add erosion and local deformation, and continuous contact with the alloy promotes soldering, especially in aluminum casting.\n      <\/p>\n      <p>\n        In aluminum and magnesium die casting, dies usually fail by thermal fatigue rather than by wear. When cracks initiate early and grow quickly, increasing hardness does not solve the problem: what matters is resistance to cyclic stress and slow crack growth, which calls for toughness and a stable microstructure under repeated heating. Cleaner variants such as <a href=\"https:\/\/aobosteel.com\/esr-tool-steel\/\">ESR grades<\/a> further improve resistance to crack initiation by reducing internal defects, which matters in long production runs.\n      <\/p>\n      <p>\n        When the casting temperature rises, as with brass and copper alloys, the failure mode shifts. Instead of cracking, the die softens, deforms and loses dimensional stability, so resistance to softening (tempering resistance) becomes more critical than toughness. The opposite happens in zinc and other low-temperature work, where the thermal load is low and cost, machining and delivery time drive the choice.\n      <\/p>\n      <p>\n        Hardness and toughness trade against each other, which is why most die-casting dies are operated in the 42-50 HRC range: below it deformation becomes more likely, above it cracking tends to accelerate. When a die fails by early cracking, reducing hardness or selecting a tougher grade is usually more effective than increasing hardness further.\n      <\/p>\n    <\/div>\n\n    <div class=\"aobo-section-title\">\n      <h2>Quick Selection Guide by Tool Steel Grade<\/h2>\n      <p>\n        Choose the grade according to whether the die is used for aluminum, magnesium, zinc, lead, brass, copper, inserts, cores, or holder blocks.\n      <\/p>\n    <\/div>\n\n    <div class=\"aobo-grid\">\n\n      <div class=\"aobo-card\">\n        <div>\n          <h3>H13 Tool Steel <small>1.2344 \/ SKD61<\/small><\/h3>\n          <p>\n            Recommended for aluminum and magnesium <a href=\"https:\/\/aobosteel.com\/blog\/3d-printed-mold-inserts-vs-wrought-h13\/\">die casting dies, inserts, and cores<\/a>.\n          <\/p>\n          <div class=\"aobo-reason\">\n            Reason: H13 gives a strong balance of hot hardness, toughness, thermal fatigue resistance, and erosion resistance against molten aluminum.\n          <\/div>\n        <\/div>\n        <div class=\"aobo-buttons\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/h13-tool-steel\/\">View Details<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"aobo-card\">\n        <div>\n          <h3>H11 Tool Steel <small>1.2343 \/ SKD6<\/small><\/h3>\n          <p>\n            Recommended for aluminum and magnesium die casting inserts, cores, and tooling where toughness is critical.\n          <\/p>\n          <div class=\"aobo-reason\">\n            Reason: H11 provides high toughness, hot strength, and resistance to thermal shock, helping delay heat-checking crack growth.\n          <\/div>\n        <\/div>\n        <div class=\"aobo-buttons\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/h11-tool-steel\/\">View Details<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"aobo-card\">\n        <div>\n          <h3>P20 Mold Steel <small>1.2311<\/small><\/h3>\n          <p>\n            Recommended for short to medium-run zinc die casting dies, inserts, and die holder blocks.\n          <\/p>\n          <div class=\"aobo-reason\">\n            Reason: P20 is commonly supplied prehardened, allowing machining to final dimensions without post-machining heat treatment distortion.\n          <\/div>\n        <\/div>\n        <div class=\"aobo-buttons\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/p20-tool-steel\/\">View Details<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"aobo-card\">\n        <div>\n          <h3>H13 Tool Steel <small>1.2344 \/ SKD61<\/small><\/h3>\n          <p>\n            Recommended for long-run zinc die casting dies that need superior wear life over many casting cycles.\n          <\/p>\n          <div class=\"aobo-reason\">\n            Reason: H13 provides better wear life and heat-checking resistance than prehardened mold steel in long-run zinc die casting.\n          <\/div>\n        <\/div>\n        <div class=\"aobo-buttons\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/h13-tool-steel\/\">View Details<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"aobo-card\">\n        <div>\n          <h3>H21 Tool Steel <small>1.2581 \/ SKD5<\/small><\/h3>\n          <p>\n            Recommended for brass and copper die casting dies and inserts under high operating temperatures.\n          <\/p>\n          <div class=\"aobo-reason\">\n            Reason: H21 contains high tungsten, giving strong red hardness and resistance to softening under severe molten brass or copper contact.\n          <\/div>\n        <\/div>\n        <div class=\"aobo-buttons\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/h21-tool-steel\/\">View Details<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n        <\/div>\n      <\/div>\n\n      <div class=\"aobo-card\">\n        <div>\n          <h3>H10 Tool Steel <small>1.2365 \/ SKD7<\/small><\/h3>\n          <p>\n            Recommended for high-temperature die casting dies and inserts where stronger hot-work performance is required.\n          <\/p>\n          <div class=\"aobo-reason\">\n            Reason: H10 is a hot-work tool steel option for applications that need hot strength, tempering resistance, and resistance to thermal fatigue.\n          <\/div>\n        <\/div>\n        <div class=\"aobo-buttons\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/h10-tool-steel\/\">View Details<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n        <\/div>\n      <\/div>\n\n    <\/div>\n\n    <div class=\"aobo-section-title\">\n      <h2>Choose the Grade by Casting Metal<\/h2>\n      <p>\n        Each casting metal creates a different thermal and erosive load, so the same die steel is not the best answer everywhere. The table below gives the first choice, the alternatives, and the reason behind them.\n      <\/p>\n    <\/div>\n\n    <table class=\"aobo-summary-table\">\n      <thead>\n        <tr>\n          <th>Casting Metal<\/th>\n          <th>First Choice<\/th>\n          <th>Alternatives<\/th>\n          <th>Main Failure Risk<\/th>\n          <th class=\"ds-text\">Selection Logic<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td>Aluminum<\/td>\n          <td>H13<\/td>\n          <td>H11, H12<\/td>\n          <td>Heat checking, soldering, erosion<\/td>\n          <td class=\"ds-text\">H13 gives the best balance of hot hardness, toughness and thermal fatigue resistance. H11 improves toughness. H12 improves abrasion and washout resistance.<\/td>\n        <\/tr>\n        <tr>\n          <td>Magnesium<\/td>\n          <td>H13<\/td>\n          <td>H11, H12<\/td>\n          <td>Thermal fatigue, cracking<\/td>\n          <td class=\"ds-text\">Magnesium die casting has similar tool steel requirements to aluminum die casting.<\/td>\n        <\/tr>\n        <tr>\n          <td>Zinc<\/td>\n          <td>P20<\/td>\n          <td>H11 or H13 for long runs<\/td>\n          <td>Wear in long production runs<\/td>\n          <td class=\"ds-text\">P20 is economical for short to medium runs and is supplied prehardened. Use H11 or H13 when longer die life is required.<\/td>\n        <\/tr>\n        <tr>\n          <td>Lead and tin<\/td>\n          <td>P20<\/td>\n          <td>H13 when higher tool life is needed<\/td>\n          <td>Low-temperature wear<\/td>\n          <td class=\"ds-text\">The lower casting temperature does not always require premium hot-work steel.<\/td>\n        <\/tr>\n        <tr>\n          <td>Brass<\/td>\n          <td>H21<\/td>\n          <td>H19, H14<\/td>\n          <td>High-temperature softening, washout, heat checking<\/td>\n          <td class=\"ds-text\">Tungsten and cobalt alloying improve red hardness and hot wear resistance.<\/td>\n        <\/tr>\n        <tr>\n          <td>Copper alloys<\/td>\n          <td>H10A<\/td>\n          <td>H19, H21<\/td>\n          <td>Severe thermal stress, hot softening, erosion<\/td>\n          <td class=\"ds-text\">Higher-alloy hot-work steels retain hardness better at elevated temperature.<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n\n    <div class=\"aobo-note\">\n      <p>\n        Working hardness follows the casting metal. For aluminum and magnesium dies, H13 is commonly run at 42-48 HRC; pushing it toward 50-52 HRC increases the cracking risk unless die geometry, cooling balance and thermal shock have been reviewed. H11 and H12 are used around 42-50 HRC depending on whether toughness or wear resistance is the priority. For brass, H21 is typically run at 38-42 HRC and H19 at 38-44 HRC. P20 is supplied prehardened at about 28-32 HRC (approximately 300 HB), which is enough for short to medium zinc runs.\n      <\/p>\n      <p>\n        High-tungsten grades such as H21 and H19 resist heat well but have lower toughness than H13 or H11. They need careful preheating and controlled cooling, because aggressive cooling raises the cracking risk.\n      <\/p>\n    <\/div>\n\n    <div class=\"aobo-section-title\">\n      <h2>Selection Summary<\/h2>\n      <p>\n        This table gives a faster comparison when the buyer already knows the casting alloy and main die failure risk.\n      <\/p>\n    <\/div>\n\n    <table class=\"aobo-summary-table\">\n      <thead>\n        <tr>\n          <th class=\"ds-text\">Die Casting Application<\/th>\n          <th class=\"ds-text\">Main Requirement<\/th>\n          <th>Aobo Steel Grades<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <td class=\"ds-text\">Aluminum and magnesium die casting dies, inserts, and cores<\/td>\n          <td class=\"ds-text\">Thermal fatigue resistance, hot hardness, toughness, and erosion resistance<\/td>\n          <td>H13, H11<\/td>\n        <\/tr>\n        <tr>\n          <td class=\"ds-text\">High-velocity aluminum flow or erosion-prone areas<\/td>\n          <td class=\"ds-text\">Resistance to washing, soldering, and molten aluminum erosion<\/td>\n          <td>H13<\/td>\n        <\/tr>\n        <tr>\n          <td class=\"ds-text\">Short to medium-run zinc die casting dies and holder blocks<\/td>\n          <td class=\"ds-text\">Cost control, prehardened supply, and low distortion risk<\/td>\n          <td>P20<\/td>\n        <\/tr>\n        <tr>\n          <td class=\"ds-text\">Long-run zinc die casting dies<\/td>\n          <td class=\"ds-text\">Higher wear life and heat-checking resistance over many cycles<\/td>\n          <td>H13, H11<\/td>\n        <\/tr>\n        <tr>\n          <td class=\"ds-text\">Brass and copper die casting dies and inserts<\/td>\n          <td class=\"ds-text\">Red hardness and resistance to softening at high temperature<\/td>\n          <td>H21<\/td>\n        <\/tr>\n        <tr>\n          <td class=\"ds-text\">High-temperature hot-work die casting applications<\/td>\n          <td class=\"ds-text\">Hot strength, tempering resistance, and thermal fatigue resistance<\/td>\n          <td>H10, H21<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n\n    <div class=\"aobo-cta\">\n      <div>\n        <h2>Need Tool Steel for Die Casting Dies or Inserts?<\/h2>\n        <p>\n          Send your grade, size, quantity, casting alloy, and die application. Aobo Steel can support bulk supply of hot-work tool steel and mold steel round bars and plates for industrial buyers.\n        <\/p>\n      <\/div>\n      <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n    <\/div>\n\n  <\/div>\n<\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel Selection for Die Casting Dies &amp; Inserts Select tool steel by casting alloy, molten metal temperature, heat checking resistance, hot hardness, erosion resistance, and toughness requirement. For die casting dies and inserts, the main choice is usually between thermal fatigue resistance, hot strength, erosion resistance, and resistance to cracking. How Die-Casting Dies Fail [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_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":"","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-15477","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.5 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Tool Steel for Die Casting Dies &amp; 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Inserts Select tool steel by casting alloy, molten metal temperature, heat checking resistance, hot hardness, erosion resistance, and toughness requirement. For die casting dies and inserts, the main choice is usually between thermal fatigue resistance, hot strength, erosion resistance, and resistance to cracking. How Die-Casting Dies Fail&hellip;","rttpg_featured_image_url":null,"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/es\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Tool Steel Selection for Die Casting Dies &amp; Inserts Select tool steel by casting alloy, molten metal temperature, heat checking resistance, hot hardness, erosion resistance, and toughness requirement. For die casting dies and inserts, the main choice is usually between thermal fatigue resistance, hot strength, erosion resistance, and resistance to cracking. How Die-Casting Dies Fail&hellip;","_links":{"self":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages\/15477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/comments?post=15477"}],"version-history":[{"count":7,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages\/15477\/revisions"}],"predecessor-version":[{"id":20272,"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/pages\/15477\/revisions\/20272"}],"wp:attachment":[{"href":"https:\/\/aobosteel.com\/es\/wp-json\/wp\/v2\/media?parent=15477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}