{"id":11293,"date":"2025-12-08T10:46:28","date_gmt":"2025-12-08T02:46:28","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11293"},"modified":"2026-04-01T16:15:01","modified_gmt":"2026-04-01T08:15:01","slug":"selection-of-tool-steels-for-die-casting-dies","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/selection-of-tool-steels-for-die-casting-dies\/","title":{"rendered":"Die Casting Tool Steel Selection Guide | H13 H11 H21 Supplier | Aobo Steel"},"content":{"rendered":"<div class=\"wp-block-uagb-container uagb-block-b71dc224 alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h1 class=\"wp-block-heading\" id=\"h-selection-of-tool-steel-for-die-casting-dies\">Selection of Tool Steel for Die-Casting Dies<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Die casting is a high-volume process where molten metal is injected under high pressure into a closed die cavity. In each cycle, the die continuously absorbs and releases heat, so it functions not only as a forming tool but also as a component subjected to repeated thermal loading.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In production, die damage is not random. It typically develops under three interacting conditions. The surface is repeatedly heated by molten metal and then rapidly cooled, creating cyclic stress that eventually leads to heat checking. At the same time, high injection pressure and rapid metal flow lead to erosion and localized deformation. In addition, continuous contact with molten alloys promotes soldering and surface degradation, especially in aluminum casting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What determines die life is not the presence of these conditions, but which one becomes dominant in a specific application.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Selection Factors for Die-Casting Tool Steels<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Material selection should begin with identifying how the die actually fails in service, rather than comparing general material properties.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Resist\u00eancia \u00e0 fadiga t\u00e9rmica (verifica\u00e7\u00e3o de calor)<br><\/strong>In most aluminum and magnesium die-casting operations, dies fail due to surface cracking caused by repeated thermal cycling. When cracks initiate early and propagate quickly, increasing hardness does not solve the problem. What matters more is the material&#8217;s ability to resist cyclic stress and slow crack growth. In such cases, steels with good toughness and stable microstructure under repeated heating are required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hot Strength and Tempering Resistance<br><\/strong>When casting temperature increases, especially with brass or copper alloys, the failure mode often shifts. Instead of cracking, the die may begin to soften, deform, or lose dimensional stability. If the surface hardness cannot be maintained during service, the die will fail even if cracking is controlled. In these conditions, resistance to softening becomes more critical than toughness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Balance Between Hardness and Toughness<br><\/strong>Higher hardness improves resistance to wear and erosion, but it also increases the risk of crack propagation under thermal stress. This is why most die-casting dies are operated at 42\u201350 HRC. Below this range, deformation becomes more likely. Above it, cracking tends to accelerate. When dies fail due to early cracking, reducing hardness or selecting a tougher grade is usually more effective than further increasing hardness.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A\u00e7os para ferramentas recomendados<\/h2>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-8350c74f\">\n<h3 class=\"wp-block-heading\" id=\"h-h13-tool-steel-supplier-1-2344-skd61\">H13 Tool Steel Supplier | 1.2344 | SKD61<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H13 is used as the baseline material for most die-casting applications because it provides a stable balance between thermal fatigue resistance, hot strength, and toughness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is suitable when the die primarily fails due to heat checking and no extreme condition dominates. In aluminum and magnesium die casting, where thermal cycling is unavoidable but not excessively severe, H13 delivers consistent and predictable performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cleaner variants, such as ESR grades, further improve resistance to crack initiation by reducing internal defects, which is important in long production runs.<\/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-50 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Enviar consulta agora<\/a><\/div>\n\n\n\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link has-ast-global-color-3-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/pt\/h13-tool-steel\/\" style=\"background-color:#ffffff03\">View H13 Material Supply Details<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-8350c74f\">\n<h3 class=\"wp-block-heading\" id=\"h-aisi-h11-tool-steel-1-2343-skd6\">AISI H11 Tool Steel | 1.2343 | SKD6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H11 becomes relevant when H13 does not last as expected, and failure is dominated by cracking rather than wear or deformation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This typically happens in dies exposed to aggressive cooling, large temperature gradients, or high-frequency thermal cycling. Under these conditions, the higher toughness of H11 helps slow crack propagation and extend die life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In practice, switching from H13 to H11 is a direct response to premature fracture problems.<\/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-50 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Enviar consulta agora<\/a><\/div>\n\n\n\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 is-style-outline is-style-outline--2\"><a class=\"wp-block-button__link has-ast-global-color-3-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/pt\/h11-tool-steel\/\" style=\"background-color:#ffffff03\">View H11 Material Supply Details<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-8350c74f\">\n<h3 class=\"wp-block-heading\" id=\"h-aisi-h21-tool-steel-1-2581-skd5\">AISI H21 Tool Steel | 1.2581 | SKD5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">H21 is selected when temperature becomes the limiting factor instead of cracking.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the die surface softens during operation, shows plastic deformation, or cannot maintain hardness at elevated temperatures, then conventional chromium-based steels are no longer sufficient. In these cases, a tungsten-based steel such as H21 is used because it retains strength and hardness at higher temperatures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, its lower toughness makes it unsuitable for applications subject to severe thermal shock. It is therefore used selectively, only when high-temperature stability is the primary requirement.<\/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-50 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Enviar consulta agora<\/a><\/div>\n\n\n\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 is-style-outline is-style-outline--3\"><a class=\"wp-block-button__link has-ast-global-color-3-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/pt\/h21-tool-steel\/\" style=\"background-color:#ffffff03\">View H21 Material Supply Details<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-8350c74f\">\n<h3 class=\"wp-block-heading\" id=\"h-aisi-p20-tool-steel-1-2311-3cr2mo\">AISI P20 Tool Steel | 1.2311 | 3Cr2Mo<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">P20 is chosen when production requirements are driven more by cost and delivery speed than by maximum die life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because it is supplied in a pre-hardened condition, it allows direct machining without heat treatment, reducing lead time and avoiding distortion. This makes it suitable for short-run production or low-temperature casting, such as zinc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, under higher thermal loads, especially in aluminum die casting, P20 lacks sufficient tempering resistance and will fail quickly. Its use is therefore limited to applications where shorter tool life is acceptable.<\/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-50 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Enviar consulta agora<\/a><\/div>\n\n\n\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 is-style-outline is-style-outline--4\"><a class=\"wp-block-button__link has-ast-global-color-3-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/pt\/p20-tool-steel\/\" style=\"background-color:#ffffff03\">View P20 Material Supply Details<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Tabela Resumo<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>A\u00e7o ferramenta de alta qualidade<\/td><td>Dureza t\u00edpica<\/td><td>Aplica\u00e7\u00f5es prim\u00e1rias<\/td><td>L\u00f3gica de Sele\u00e7\u00e3o<\/td><\/tr><tr><td>AISI H13<\/td><td>42\u201352 HRC<\/td><td>Al, Mg, Zn (General Use)<\/td><td>Used when heat checking is the main failure mode<\/td><\/tr><tr><td>AISI H11<\/td><td>44\u201350 HRC<\/td><td>Al, Zn (Severe Thermal Cycling)<\/td><td>Selected when cracking occurs earlier than expected<\/td><\/tr><tr><td>AISI H21<\/td><td>38\u201352 HRC<\/td><td>Brass, Copper<\/td><td>Used when high-temperature softening becomes critical<\/td><\/tr><tr><td>AISI P20<\/td><td>28\u201332 HRC<\/td><td>Zinc (Short Run)<\/td><td>Used when cost and fast machining are prioritized<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Selection of Tool Steel for Die-Casting Dies Die casting is a high-volume process where molten metal is injected under high pressure into a closed die cavity. In each cycle, the die continuously absorbs and releases heat, so it functions not only as a forming tool but also as a component subjected to repeated thermal loading. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"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":"","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-11293","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6.1 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Die Casting Tool Steel Selection Guide | H13 H11 H21 Supplier | Aobo Steel<\/title>\n<meta name=\"description\" content=\"Learn how to select tool steel for die-casting dies based on failure modes like heat checking, cracking, and softening. 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