{"id":15458,"date":"2026-05-16T12:47:43","date_gmt":"2026-05-16T04:47:43","guid":{"rendered":"https:\/\/aobosteel.com\/?p=15458"},"modified":"2026-06-15T07:24:48","modified_gmt":"2026-06-14T23:24:48","slug":"4140-vs-a2-tool-steel","status":"publish","type":"post","link":"https:\/\/aobosteel.com\/pt\/blog\/4140-vs-a2-tool-steel\/","title":{"rendered":"A\u00e7o ferramenta 4140 vs. A2: principais diferen\u00e7as e guia de sele\u00e7\u00e3o"},"content":{"rendered":"<h1 class=\"wp-block-heading has-text-align-center has-large-font-size\" id=\"h-what-is-the-difference-between-4140-and-a2-tool-steel\">Qual a diferen\u00e7a entre o a\u00e7o ferramenta 4140 e o A2?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o 4140 \u00e9 um a\u00e7o estrutural de m\u00e9dio carbono e baixa liga, indicado para pe\u00e7as robustas e submetidas a grandes cargas. O a\u00e7o A2 \u00e9 um a\u00e7o ferramenta para trabalho a frio, com endurecimento ao ar, utilizado na fabrica\u00e7\u00e3o de ferramentas resistentes ao desgaste.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Escolha o a\u00e7o 4140 quando a pe\u00e7a precisar de tenacidade, ductilidade, resist\u00eancia \u00e0 fadiga e resist\u00eancia estrutural. <a href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">A\u00e7o para ferramentas A2<\/a> Quando a ferramenta necessita de alta dureza, resist\u00eancia ao desgaste abrasivo, reten\u00e7\u00e3o de fio e melhor estabilidade dimensional ap\u00f3s o tratamento t\u00e9rmico.<\/p>\n\n\n\n<h2 id=\"h-4140-vs-a2-tool-steel-chemical-composition\" class=\"wp-block-heading has-large-font-size\">Composi\u00e7\u00e3o qu\u00edmica do a\u00e7o ferramenta 4140 versus A2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o A2 utiliza maior teor de carbono e cromo para construir uma resist\u00eancia ao desgaste com suporte de carboneto. O a\u00e7o 4140 utiliza uma quantidade moderada de carbono, juntamente com cromo e molibd\u00eanio, para manter a resist\u00eancia, a tenacidade e a resist\u00eancia \u00e0 fadiga.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Elemento<\/strong><\/td><td><strong>A\u00e7o 4140<\/strong><\/td><td><strong>A\u00e7o para ferramentas A2<\/strong><\/td><\/tr><tr><td>Carbono<\/td><td>0.38\u20130.45%<\/td><td>0,95\u20131,05%<\/td><\/tr><tr><td>Cromo<\/td><td>0.80\u20131.10%<\/td><td>4,75\u20135,50%<\/td><\/tr><tr><td>Molibd\u00eanio<\/td><td>0.15\u20130.30%<\/td><td>0,90\u20131,40%<\/td><\/tr><tr><td>Van\u00e1dio<\/td><td>N\u00e3o \u00e9 um elemento de liga principal<\/td><td>0,15\u20130,50%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O maior teor de carbono e cromo do A2 favorece a forma\u00e7\u00e3o de carbonetos ricos em cromo. Esses carbonetos melhoram a resist\u00eancia \u00e0 abras\u00e3o e a reten\u00e7\u00e3o do fio, mas reduzem a ductilidade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o 4140 n\u00e3o depende da forma\u00e7\u00e3o de carbonetos em grande quantidade. Seu menor teor de liga confere-lhe uma matriz mais resistente, ideal para eixos, engrenagens, suportes e outras pe\u00e7as mec\u00e2nicas sujeitas a cargas elevadas.<\/p>\n\n\n\n<h2 id=\"h-4140-vs-a2-tool-steel-mechanical-properties\" class=\"wp-block-heading has-large-font-size\">Propriedades mec\u00e2nicas do a\u00e7o ferramenta 4140 versus A2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o A2 atinge uma dureza muito maior do que o 4140, enquanto o 4140 mant\u00e9m melhor ductilidade e resist\u00eancia ao impacto. Essa \u00e9 a principal diferen\u00e7a mec\u00e2nica entre os dois a\u00e7os.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Propriedade<\/strong><\/td><td><strong>A\u00e7o 4140<\/strong><\/td><td><strong>A\u00e7o para ferramentas A2<\/strong><\/td><\/tr><tr><td>Dureza ap\u00f3s recozimento<\/td><td>Aproximadamente 197 HB<\/td><td>201\u2013229 HB<\/td><\/tr><tr><td>dureza normalizada<\/td><td>Aproximadamente 302 HB<\/td><td>Normalmente n\u00e3o normalizado<\/td><\/tr><tr><td>Condi\u00e7\u00e3o pr\u00e9-endurecida<\/td><td>262\u2013321 HB<\/td><td>Condi\u00e7\u00f5es de fornecimento n\u00e3o habituais<\/td><\/tr><tr><td>dureza ap\u00f3s t\u00eampera<\/td><td>Inferior a A2<\/td><td>Aproximadamente 62\u201365 HRC<\/td><\/tr><tr><td>Dureza de trabalho t\u00edpica<\/td><td>Menor dureza para preservar a resist\u00eancia.<\/td><td>Geralmente 58\u201360 HRC<\/td><\/tr><tr><td>Exemplo com tratamento t\u00e9rmico mais elevado<\/td><td>36\u201340 HRC para alguns porta-ferramentas<\/td><td>aplica\u00e7\u00f5es de ferramentas de alta dureza<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Para resist\u00eancia e ductilidade:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Condi\u00e7\u00e3o<\/strong><\/td><td><strong>Resist\u00eancia \u00e0 tra\u00e7\u00e3o final<\/strong><\/td><td><strong>Resist\u00eancia ao escoamento<\/strong><\/td><td><strong>Alongamento<\/strong><\/td><\/tr><tr><td>A2 com 54,1 HRC<\/td><td>1858 MPa<\/td><td>1822 MPa<\/td><td>5.0%<\/td><\/tr><tr><td>A2 a 46,7 HRC<\/td><td>1604 MPa<\/td><td>1510 MPa<\/td><td>8.5%<\/td><\/tr><tr><td>4140 recozido<\/td><td>655 MPa<\/td><td>417 MPa<\/td><td>25.7%<\/td><\/tr><tr><td>4140 normalizado<\/td><td>1020 MPa<\/td><td>655 MPa<\/td><td>17.7%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o A2 \u00e9 mais resistente do que os a\u00e7os-ferramenta da s\u00e9rie D de alta liga, como o D2, mas n\u00e3o \u00e9 um a\u00e7o resistente a choques como o S7. O a\u00e7o 4140 \u00e9 geralmente mais seguro para cargas din\u00e2micas, impactos, tor\u00e7\u00e3o e fadiga.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em termos de resist\u00eancia ao desgaste, o A2 \u00e9 o material mais resistente. Sua composi\u00e7\u00e3o de carbono 1% e cromo 5% proporciona resist\u00eancia ao desgaste abrasivo e reten\u00e7\u00e3o de fio. O a\u00e7o 4140 apresenta boa resist\u00eancia \u00e0 fadiga e ao impacto, mas n\u00e3o foi projetado como superf\u00edcie de trabalho para estampagem, corte ou conforma\u00e7\u00e3o de metais.<\/p>\n\n\n\n<h2 id=\"h-4140-vs-a2-tool-steel-heat-treatment\" class=\"wp-block-heading has-large-font-size\">Tratamento t\u00e9rmico do a\u00e7o ferramenta 4140 versus A2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Os a\u00e7os A2 e 4140 requerem diferentes processos de tratamento t\u00e9rmico. O A2 endurece ao ar, enquanto o 4140 geralmente necessita de t\u00eampera em \u00f3leo. Essa diferen\u00e7a afeta significativamente o risco de distor\u00e7\u00e3o e a aplica\u00e7\u00e3o final.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Etapa de tratamento t\u00e9rmico<\/strong><\/td><td><strong>A\u00e7o 4140<\/strong><\/td><td><strong>A\u00e7o para ferramentas A2<\/strong><\/td><\/tr><tr><td>Normalizando<\/td><td>Comum ap\u00f3s a forja ou antes da usinagem.<\/td><td>N\u00e3o recomendado<\/td><\/tr><tr><td>Recozimento<\/td><td>830\u2013870\u00b0C, forno resfriado a cerca de 480\u00b0C<\/td><td>845\u2013900 \u00b0C, resfriamento lento em forno<\/td><\/tr><tr><td>Pr\u00e9-aquecimento<\/td><td>\u00datil em torno de 650\u00b0C.<\/td><td>Importante em torno de 650\u00b0C<\/td><\/tr><tr><td>Austenitiza\u00e7\u00e3o<\/td><td>830\u2013870\u00b0C<\/td><td>925\u2013980\u00b0C<\/td><\/tr><tr><td>Resfriamento<\/td><td>Geralmente, t\u00eampera em \u00f3leo<\/td><td>Resfriamento a ar cont\u00ednuo<\/td><\/tr><tr><td>T\u00eampera<\/td><td>Geralmente de temperamento \u00fanico<\/td><td>Normalmente \u00e9 necess\u00e1rio um processo de t\u00eampera dupla.<\/td><\/tr><tr><td>Tratamento criog\u00eanico<\/td><td>Geralmente n\u00e3o \u00e9 necess\u00e1rio<\/td><td>\u00c0s vezes usado para reduzir a austenita retida.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O comportamento de endurecimento ao ar do A2 reduz a tens\u00e3o de t\u00eampera e melhora a estabilidade dimensional. Isso o torna \u00fatil para pun\u00e7\u00f5es, matrizes, calibradores e ferramentas que exigem maior precis\u00e3o no controle dimensional.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O tratamento t\u00e9rmico em \u00f3leo do a\u00e7o 4140 confere-lhe resist\u00eancia, mas o resfriamento mais severo pode aumentar a movimenta\u00e7\u00e3o e a distor\u00e7\u00e3o. Ainda assim, \u00e9 um m\u00e9todo pr\u00e1tico para pe\u00e7as de m\u00e1quinas, suportes e componentes de apoio onde a tenacidade \u00e9 mais importante do que o controle dimensional preciso ap\u00f3s o endurecimento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O processo de revenimento tamb\u00e9m varia. O a\u00e7o A2 normalmente necessita de revenimento duplo para estabilizar a estrutura endurecida e reduzir a fragilidade. J\u00e1 o a\u00e7o 4140 geralmente passa por um \u00fanico revenimento para atingir o equil\u00edbrio desejado entre resist\u00eancia e tenacidade. Para o a\u00e7o 4140, a faixa de revenimento de 230\u2013370 \u00b0C deve ser evitada, pois pode reduzir a resist\u00eancia ao impacto.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o A2 pode reter mais austenita devido ao seu maior teor de carbono e elementos de liga. Tratamentos subzero ou criog\u00eanicos s\u00e3o utilizados quando a estabilidade dimensional \u00e9 cr\u00edtica. Aplica\u00e7\u00f5es estruturais padr\u00e3o do a\u00e7o 4140 geralmente n\u00e3o requerem essa etapa.<\/p>\n\n\n\n<h2 id=\"h-4140-vs-a2-tool-steel-common-applications\" class=\"wp-block-heading has-large-font-size\">Aplica\u00e7\u00f5es comuns do a\u00e7o ferramenta 4140 versus A2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o 4140 \u00e9 selecionado para pe\u00e7as estruturais e ferramentas de suporte. J\u00e1 o a\u00e7o A2 \u00e9 escolhido para superf\u00edcies de ferramentas de trabalho que exigem dureza, resist\u00eancia ao desgaste e estabilidade dimensional.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Tipo de aplica\u00e7\u00e3o<\/strong><\/td><td><strong>A\u00e7o 4140<\/strong><\/td><td><strong>A\u00e7o para ferramentas A2<\/strong><\/td><\/tr><tr><td>Pe\u00e7as de m\u00e1quinas<\/td><td>Virabrequins, bielas, eixos, engrenagens, pinh\u00f5es, estrias<\/td><td>N\u00e3o \u00e9 a escolha normal.<\/td><\/tr><tr><td>Componentes de alta resist\u00eancia<\/td><td>Brocas para perfura\u00e7\u00e3o de po\u00e7os de petr\u00f3leo, pe\u00e7as de trem de pouso, pe\u00e7as de fuselagem, vasos de press\u00e3o<\/td><td>N\u00e3o \u00e9 a escolha normal.<\/td><\/tr><tr><td>Fixadores e ferragens<\/td><td>Parafusos de alta resist\u00eancia, pinos, parafusos de cabe\u00e7a sextavada, chaves, tenazes<\/td><td>N\u00e3o \u00e9 a escolha normal.<\/td><\/tr><tr><td>Pe\u00e7as de suporte para a sala de ferramentas<\/td><td>Porta-ferramentas, hastes, gabaritos de perfura\u00e7\u00e3o, placas de apoio, bases de moldes, blocos de suporte, sapatas de matrizes<\/td><td>Utilizado quando \u00e9 necess\u00e1ria resist\u00eancia ao desgaste.<\/td><\/tr><tr><td>Ferramentas para trabalho a frio<\/td><td>Limitado ao suporte de pe\u00e7as<\/td><td>Matrizes de corte, matrizes de dobra, matrizes de cunhagem, matrizes de estampagem, matrizes de recorte<\/td><\/tr><tr><td>Ferramentas de precis\u00e3o<\/td><td>Uso limitado<\/td><td>Calibradores mestres, buchas de perfura\u00e7\u00e3o, ferramentas de recartilhamento, placas de distribui\u00e7\u00e3o<\/td><\/tr><tr><td>L\u00e2minas e facas<\/td><td>N\u00e3o \u00e9 ideal para l\u00e2minas de corte de alto desgaste.<\/td><td>L\u00e2minas de corte, facas de corte longitudinal, facas rotativas, facas para trabalhar madeira<\/td><\/tr><tr><td>Pe\u00e7as de desgaste<\/td><td>Pe\u00e7as de desgaste estrutural geral<\/td><td>Cames, seguidores de cames, guias, rolamentos deslizantes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Utilize o a\u00e7o 4140 para o corpo, suporte, placa de apoio, base do molde ou pe\u00e7a de suporte estrutural. Utilize o a\u00e7o A2 para o pun\u00e7\u00e3o, aresta da matriz, l\u00e2mina, superf\u00edcie de conforma\u00e7\u00e3o, superf\u00edcie de medi\u00e7\u00e3o ou componente de ferramenta sujeito a desgaste.<\/p>\n\n\n\n<h2 id=\"h-4140-vs-a2-tool-steel-quick-material-selection-rule\" class=\"wp-block-heading has-large-font-size\">A\u00e7o ferramenta 4140 vs. A2: Regra r\u00e1pida para sele\u00e7\u00e3o de materiais<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o escolha entre 4140 e A2 apenas pela dureza. Selecione-os pelo principal modo de falha.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Principal risco de falha<\/strong><\/td><td><strong>Melhor escolha<\/strong><\/td><td><strong>Raz\u00e3o<\/strong><\/td><\/tr><tr><td>Tor\u00e7\u00e3o, fissura\u00e7\u00e3o por fadiga, choque ou deforma\u00e7\u00e3o estrutural<\/td><td>4140<\/td><td>Melhor tenacidade, ductilidade e resist\u00eancia \u00e0 fadiga.<\/td><\/tr><tr><td>Desgaste abrasivo, perda de nitidez das arestas ou perda de precis\u00e3o de corte\/conforma\u00e7\u00e3o.<\/td><td>A2<\/td><td>Maior dureza, melhor resist\u00eancia ao desgaste e maior estabilidade dimensional.<\/td><\/tr><tr><td>Suporte, base do molde, placa de apoio ou corpo de suporte<\/td><td>4140<\/td><td>Forte e resistente o suficiente para suporte estrutural.<\/td><\/tr><tr><td>pun\u00e7\u00e3o, aresta da matriz, l\u00e2mina de corte, calibrador ou superf\u00edcie de desgaste<\/td><td>A2<\/td><td>Projetado para superf\u00edcies de contato de ferramentas de trabalho a frio<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"h-\">Para pe\u00e7as de m\u00e1quinas e componentes de suporte, especifique a\u00e7o 4140. Para ferramentas de trabalho a frio que devem resistir ao desgaste e manter as dimens\u00f5es ap\u00f3s o tratamento t\u00e9rmico, especifique a\u00e7o ferramenta A2.<\/p>\n\n\n\n<ul class=\"wp-block-yoast-seo-related-links yoast-seo-related-links\">\n<li><a href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">A\u00e7o para ferramentas A2 | 1.2363 | SKD12<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/blog\/best-tool-steels-for-cold-extrusion-dies\/\">Melhores a\u00e7os para matrizes de extrus\u00e3o a frio<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/blog\/is-a2-tool-steel-wear-resistant\/\">O a\u00e7o ferramenta A2 \u00e9 resistente ao desgaste? Dureza, usos e compara\u00e7\u00e3o.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/d2-steel-vs-4140\/\">A\u00e7o D2 vs. A\u00e7o 4140: Propriedades, Dureza e Guia de Sele\u00e7\u00e3o | Aobo Steel<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/h13-vs-a2-tool-steel\/\">A\u00e7o ferramenta H13 vs A2: Guia de sele\u00e7\u00e3o para matrizes e ferramentas<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>What is the difference between 4140 and A2 tool steel? 4140 is a medium-carbon, low-alloy structural steel for tough, loaded parts. A2 is an air-hardening cold work tool steel for wear-resistant tooling. Choose 4140 when the part needs toughness, ductility, fatigue resistance, and structural strength. Choose A2 tool steel when the tool needs high hardness, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15459,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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":""},"categories":[22],"tags":[],"class_list":["post-15458","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>4140 vs A2 Tool Steel: Key Differences and Selection Guide - AoboSteel<\/title>\n<meta name=\"description\" content=\"Compare 4140 and A2 tool steel by composition, hardness, heat treatment, applications, and failure mode. 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A2 is an air-hardening cold work tool steel for wear-resistant tooling. Choose 4140 when the part needs toughness, ductility, fatigue resistance, and structural strength. Choose A2 tool steel when the tool needs high hardness,&hellip;","rttpg_featured_image_url":{"full":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2.avif",1254,1254,false],"landscape":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2.avif",1254,1254,false],"portraits":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2.avif",1254,1254,false],"thumbnail":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2-150x150.avif",150,150,true],"medium":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2-300x300.avif",300,300,true],"large":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2-1024x1024.avif",1024,1024,true],"1536x1536":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2.avif",1254,1254,false],"2048x2048":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2.avif",1254,1254,false],"trp-custom-language-flag":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/4140-vs-A2-12x12.avif",12,12,true]},"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/pt\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/aobosteel.com\/pt\/blog\/category\/blog\/\" rel=\"category tag\">Blog<\/a>","rttpg_excerpt":"What is the difference between 4140 and A2 tool steel? 4140 is a medium-carbon, low-alloy structural steel for tough, loaded parts. A2 is an air-hardening cold work tool steel for wear-resistant tooling. Choose 4140 when the part needs toughness, ductility, fatigue resistance, and structural strength. 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