{"id":13493,"date":"2026-03-11T21:23:05","date_gmt":"2026-03-11T13:23:05","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=13493"},"modified":"2026-07-26T11:56:47","modified_gmt":"2026-07-26T03:56:47","slug":"h13-steel-composition","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/h13-steel-composition\/","title":{"rendered":"Composi\u00e7\u00e3o qu\u00edmica do a\u00e7o ferramenta H13 (1.2344 \/ SKD61)"},"content":{"rendered":"

Composi\u00e7\u00e3o qu\u00edmica do a\u00e7o para ferramentas H13<\/h1>\n\n\n\n

H13<\/a> \u00c9 um a\u00e7o ferramenta para trabalho a quente, composto de cromo, molibd\u00eanio e van\u00e1dio, utilizado em moldes de fundi\u00e7\u00e3o, moldes de forjamento e ferramentas de extrus\u00e3o. Sua capacidade de suportar ciclos repetidos de aquecimento e resfriamento prov\u00e9m de um equil\u00edbrio espec\u00edfico de elementos de liga, e n\u00e3o da a\u00e7\u00e3o isolada de um \u00fanico elemento. Carbono, cromo, molibd\u00eanio e van\u00e1dio atuam em conjunto para controlar a temperabilidade, a forma\u00e7\u00e3o de carbonetos e a resist\u00eancia ao amolecimento em altas temperaturas.<\/p>\n\n\n\n

Para compradores que analisam um certificado de teste de f\u00e1brica, os n\u00fameros de composi\u00e7\u00e3o s\u00f3 fazem sentido dentro de um contexto. Um lote que se enquadra na faixa de refer\u00eancia, mas apresenta baixos n\u00edveis de cromo e molibd\u00eanio, ter\u00e1 um comportamento diferente em um bloco de matriz grande do que um lote com n\u00edveis altos, principalmente em termos de temperabilidade em se\u00e7\u00f5es espessas. Compreender a fun\u00e7\u00e3o de cada elemento permite interpretar um certificado como um indicador de desempenho, e n\u00e3o apenas como uma lista de verifica\u00e7\u00e3o de aprova\u00e7\u00e3o ou reprova\u00e7\u00e3o.<\/p>\n\n\n\n

Composi\u00e7\u00e3o Qu\u00edmica Padr\u00e3o<\/h2>\n\n\n\n

A tabela abaixo mostra a faixa de composi\u00e7\u00e3o padr\u00e3o para AISI H13, UNS T20813.<\/p>\n\n\n\n

Elemento<\/th>S\u00edmbolo<\/th>Peso %<\/th><\/tr><\/thead>
Carbono<\/td>C<\/td>0,32 a 0,45<\/td><\/tr>
Cromo<\/td>Cr<\/td>4,75 a 5,50<\/td><\/tr>
Molibd\u00eanio<\/td>Mo<\/td>1,10 a 1,75<\/td><\/tr>
Van\u00e1dio<\/td>V<\/td>0,80 a 1,20<\/td><\/tr>
Sil\u00edcio<\/td>Si<\/td>0,80 a 1,25<\/td><\/tr>
Mangan\u00eas<\/td>Mn<\/td>0,20 a 0,60<\/td><\/tr>
F\u00f3sforo<\/td>P<\/td>0,030 m\u00e1ximo<\/td><\/tr>
Enxofre<\/td>S<\/td>0,030 m\u00e1ximo<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

A liga H13 \u00e9 comumente especificada juntamente com seus equivalentes internacionais, DIN 1.2344 e JIS SKD61. As tr\u00eas normas compartilham a mesma fam\u00edlia de ligas e geralmente s\u00e3o tratadas como intercambi\u00e1veis na aquisi\u00e7\u00e3o de ferramentas, embora as faixas de especifica\u00e7\u00f5es publicadas nem sempre sejam id\u00eanticas elemento por elemento.<\/p>\n\n\n\n

Elemento<\/th>AISI H13<\/th>DIN 1.2344<\/th>JIS SKD61<\/th><\/tr><\/thead>
Carbono<\/td>0,32 a 0,45<\/td>0,35 a 0,42<\/td>0,35 a 0,42<\/td><\/tr>
Cromo<\/td>4,75 a 5,50<\/td>4,80 a 5,50<\/td>4,80 a 5,50<\/td><\/tr>
Molibd\u00eanio<\/td>1,10 a 1,75<\/td>1,20 a 1,50<\/td>1,00 a 1,50<\/td><\/tr>
Van\u00e1dio<\/td>0,80 a 1,20<\/td>0,85 a 1,15<\/td>0,80 a 1,15<\/td><\/tr>
Sil\u00edcio<\/td>0,80 a 1,25<\/td>0,80 a 1,20<\/td>0,80 a 1,20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

As diferen\u00e7as s\u00e3o t\u00e3o pequenas que as f\u00e1bricas geralmente fornecem produtos da mesma corrida que atendem a qualquer uma das tr\u00eas normas, mas os compradores com requisitos de especifica\u00e7\u00e3o rigorosos ainda devem solicitar o certificado de acordo com a norma exata especificada em seu pedido de compra, em vez de presumir equival\u00eancia total.<\/p>\n\n\n\n

Por que a composi\u00e7\u00e3o \u00e9 importante para a capacidade de endurecimento?<\/h2>\n\n\n\n

O a\u00e7o H13 combina um teor moderado de carbono com tr\u00eas elementos formadores de carbonetos fortes: cromo, molibd\u00eanio e van\u00e1dio. Essa combina\u00e7\u00e3o confere ao a\u00e7o uma alta temperabilidade, o que significa que ele pode se transformar em martensita por resfriamento ao ar, mesmo em se\u00e7\u00f5es relativamente espessas. O endurecimento ao ar mant\u00e9m a tens\u00e3o de t\u00eampera e a distor\u00e7\u00e3o baixas, o que \u00e9 crucial para grandes blocos de matrizes, onde uma se\u00e7\u00e3o deformada ou trincada durante o tratamento t\u00e9rmico implica em descarte de material.<\/p>\n\n\n\n

Durante o revenido, os mesmos tr\u00eas elementos precipitam como carbonetos finos de liga dentro da matriz martens\u00edtica. Isso confere ao H13 sua resposta de endurecimento secund\u00e1rio e permite que ele mantenha propriedades \u00fateis. dureza<\/a> em temperaturas de opera\u00e7\u00e3o que amoleceriam o a\u00e7o carbono comum ou o a\u00e7o de baixa liga.<\/p>\n\n\n\n

Papel dos Elementos Individuais<\/h2>\n\n\n\n

Carbono.<\/strong> O carbono promove o endurecimento martens\u00edtico e \u00e9 mantido em um n\u00edvel moderado de 0,32 a 0,45%, para que o a\u00e7o ganhe dureza sem se tornar quebradi\u00e7o. O excesso de carbono em um a\u00e7o para trabalho a quente aumenta o risco de fissura\u00e7\u00e3o por choque t\u00e9rmico, que \u00e9 exatamente o modo de falha que o H13 foi escolhido para evitar.<\/p>\n\n\n\n

Cromo.<\/strong> Com uma concentra\u00e7\u00e3o de 4,75 a 5,50%, o cromo \u00e9 o segundo elemento de liga mais adicionado, depois do ferro. Ele aumenta a temperabilidade, permitindo que se\u00e7\u00f5es espessas endure\u00e7am completamente ao ar, melhora a resist\u00eancia \u00e0 oxida\u00e7\u00e3o durante o tratamento t\u00e9rmico e forma carbonetos ricos em cromo que contribuem para a resist\u00eancia ao desgaste e a estabilidade da t\u00eampera.<\/p>\n\n\n\n

Molibd\u00eanio.<\/strong> O molibd\u00eanio fortalece o a\u00e7o em altas temperaturas e retarda o crescimento de carbonetos durante o revenido. Este \u00e9 o elemento mais respons\u00e1vel pela manuten\u00e7\u00e3o da dureza do a\u00e7o H13 ap\u00f3s repetidos ciclos t\u00e9rmicos em servi\u00e7o, em vez de sofrer amolecimento ap\u00f3s as primeiras produ\u00e7\u00f5es.<\/p>\n\n\n\n

Van\u00e1dio.<\/strong> O van\u00e1dio forma os carbonetos mais duros e est\u00e1veis da liga. Ele controla o crescimento dos gr\u00e3os durante o tratamento t\u00e9rmico e \u00e9 o principal motivo pelo qual o H13 supera ligas com menor teor de van\u00e1dio, como o H11, em resist\u00eancia \u00e0 abras\u00e3o. Compradores que comparam o H13 com o H11 em um certificado devem observar primeiro o teor de van\u00e1dio, j\u00e1 que esse \u00fanico valor explica a maior parte da diferen\u00e7a de desempenho em rela\u00e7\u00e3o ao desgaste entre as duas ligas.<\/p>\n\n\n\n

Sil\u00edcio.<\/strong> O sil\u00edcio \u00e9 principalmente um desoxidante herdado da siderurgia e confere alguma resist\u00eancia ao revenido por meio do fortalecimento por solu\u00e7\u00e3o s\u00f3lida. N\u00edveis de sil\u00edcio acima da faixa especificada podem reduzir a tenacidade, portanto, certificados que mostram sil\u00edcio pr\u00f3ximo ao limite superior da faixa merecem uma an\u00e1lise mais detalhada em aplica\u00e7\u00f5es onde a tenacidade \u00e9 um fator cr\u00edtico.<\/p>\n\n\n\n

Mangan\u00eas.<\/strong> O mangan\u00eas auxilia na desoxida\u00e7\u00e3o e reage com o enxofre para formar sulfetos de mangan\u00eas, o que reduz o risco de trincas a quente durante o forjamento. O teor de mangan\u00eas \u00e9 mantido relativamente baixo no H13 porque n\u00edveis elevados aumentam a sensibilidade \u00e0 fissura\u00e7\u00e3o por t\u00eampera.<\/p>\n\n\n\n

Controle de impurezas<\/h2>\n\n\n\n

O teor de f\u00f3sforo e enxofre \u00e9 limitado a um m\u00e1ximo de 0,030%. O f\u00f3sforo segrega-se nos contornos de gr\u00e3o e promove fragiliza\u00e7\u00e3o, enquanto o enxofre forma inclus\u00f5es de sulfeto que reduzem a ductilidade transversal e podem atuar como pontos de inicia\u00e7\u00e3o de trincas sob carregamento c\u00edclico. O H13 de grau superior, particularmente o material destinado a grandes blocos de fundi\u00e7\u00e3o sob press\u00e3o ou superf\u00edcies de cavidades polidas, \u00e9 frequentemente produzido com refino secund\u00e1rio, como desgaseifica\u00e7\u00e3o a v\u00e1cuo ou refus\u00e3o por eletroesc\u00f3ria, para reduzir o teor de inclus\u00f5es bem abaixo do limite padr\u00e3o. Se um projeto especificar Material ESR<\/a>, O certificado deve mostrar isso explicitamente, em vez de apenas confirmar que o f\u00f3sforo e o enxofre est\u00e3o dentro da faixa padr\u00e3o.<\/p>\n\n\n\n

Como a composi\u00e7\u00e3o influencia o tratamento t\u00e9rmico<\/h2>\n\n\n\n

O cromo, o molibd\u00eanio e o van\u00e1dio permitem que o H13 seja austenitizado a uma temperatura relativamente alta, tipicamente entre 1010 e 1030 graus Celsius, de modo que os carbonetos da liga se dissolvam completamente antes do resfriamento brusco. Durante o revenido, esses mesmos elementos retornam como precipitados finos, produzindo a curva de endurecimento secund\u00e1rio caracter\u00edstica do H13 e de outras ligas para trabalho a quente. Como esses elementos tamb\u00e9m formam nitretos est\u00e1veis, o H13 responde bem \u00e0 nitreta\u00e7\u00e3o, que \u00e9 comumente usada para adicionar uma camada superficial dura e resistente ao desgaste sem afetar a tenacidade do n\u00facleo da matriz. Para informa\u00e7\u00f5es detalhadas, consulte o [inserir n\u00famero da especifica\u00e7\u00e3o aqui]. Guia de tratamento t\u00e9rmico H13<\/a>.<\/p>\n\n\n\n

Como ler um relat\u00f3rio de an\u00e1lise qu\u00edmica<\/h2>\n\n\n\n

A primeira verifica\u00e7\u00e3o em qualquer certificado \u00e9 confirmar se todos os elementos est\u00e3o dentro da faixa especificada. Isso confirma que o material \u00e9 H13, mas n\u00e3o confirma o desempenho. Dois lotes podem passar no teste de composi\u00e7\u00e3o e ainda assim apresentar comportamentos diferentes em servi\u00e7o, caso as pr\u00e1ticas de fus\u00e3o, redu\u00e7\u00e3o por forjamento ou tratamento t\u00e9rmico sejam diferentes. Por essa raz\u00e3o, os dados de composi\u00e7\u00e3o devem ser analisados em conjunto com o certificado de ensaio do material e, quando dispon\u00edveis, com os resultados do ensaio ultrass\u00f4nico, em vez de serem tratados como um indicador de qualidade isolado.<\/p>\n\n\n\n

Perguntas frequentes<\/h2>\n\n\n\n
Qual \u00e9 a composi\u00e7\u00e3o qu\u00edmica padr\u00e3o do a\u00e7o ferramenta H13?<\/strong> <\/strong>

A liga H13 normalmente cont\u00e9m de 0,32 a 0,45% de carbono, de 4,75 a 5,50% de cromo, de 1,10 a 1,75% de molibd\u00eanio e de 0,80 a 1,20% de van\u00e1dio, al\u00e9m de sil\u00edcio, mangan\u00eas e quantidades bastante limitadas de f\u00f3sforo e enxofre.<\/p> <\/div>

Por que o cromo \u00e9 adicionado ao a\u00e7o ferramenta H13?<\/strong> <\/strong>

O cromo aumenta a temperabilidade, permitindo que se\u00e7\u00f5es espessas endure\u00e7am completamente ao ar, melhora a resist\u00eancia \u00e0 oxida\u00e7\u00e3o durante o tratamento t\u00e9rmico e forma carbonetos que contribuem para a resist\u00eancia ao desgaste e a estabilidade da t\u00eampera.<\/p> <\/div>

Como o van\u00e1dio afeta as propriedades do a\u00e7o H13?<\/strong> <\/strong>

O van\u00e1dio forma carbonetos duros e est\u00e1veis que melhoram a resist\u00eancia \u00e0 abras\u00e3o e controlam o crescimento dos gr\u00e3os. Essa \u00e9 a principal raz\u00e3o pela qual o H13 apresenta melhor resist\u00eancia ao desgaste do que ligas com menor teor de van\u00e1dio, como o H11.<\/p> <\/div>

Qual \u00e9 o papel do molibd\u00eanio na composi\u00e7\u00e3o do H13?<\/strong> <\/strong>

O molibd\u00eanio fortalece o a\u00e7o em altas temperaturas, retarda o crescimento de carbonetos durante o revenido e favorece a resposta de endurecimento secund\u00e1rio que permite ao H13 manter a dureza em servi\u00e7o.<\/p> <\/div>

Por que o f\u00f3sforo e o enxofre s\u00e3o limitados no a\u00e7o H13?<\/strong> <\/strong>

Ambos t\u00eam um limite m\u00e1ximo de 0,030%. O f\u00f3sforo pode fragilizar os contornos de gr\u00e3o, e o enxofre forma inclus\u00f5es que reduzem a ductilidade e podem iniciar trincas sob cargas t\u00e9rmicas e mec\u00e2nicas repetidas.<\/p> <\/div>

As normas DIN 1.2344 e JIS SKD61 s\u00e3o equivalentes \u00e0 H13?<\/strong><\/strong>

Pertencem \u00e0 mesma fam\u00edlia de ligas e geralmente s\u00e3o tratados como intercambi\u00e1veis na aquisi\u00e7\u00e3o de ferramentas, embora as faixas de especifica\u00e7\u00e3o publicadas variem ligeiramente de elemento para elemento. Compradores com requisitos de especifica\u00e7\u00e3o rigorosos devem confirmar se o certificado corresponde exatamente \u00e0 norma especificada no pedido de compra.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"

H13 Tool Steel Chemical Composition H13 is a chromium-molybdenum-vanadium hot work tool steel used for die casting dies, forging dies, and extrusion tooling. Its ability to withstand repeated heating and cooling cycles comes from a specific balance of alloying elements rather than any single element acting alone. Carbon, chromium, molybdenum, and vanadium work together to […]<\/p>\n","protected":false},"author":1,"featured_media":17056,"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":"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 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Its ability to withstand repeated heating and cooling cycles comes from a specific balance of alloying elements rather than any single element acting alone. Carbon, chromium, molybdenum, and vanadium work together to…","_links":{"self":[{"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/pages\/13493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/comments?post=13493"}],"version-history":[{"count":2,"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/pages\/13493\/revisions"}],"predecessor-version":[{"id":17077,"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/pages\/13493\/revisions\/17077"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/media\/17056"}],"wp:attachment":[{"href":"https:\/\/aobosteel.com\/pt\/wp-json\/wp\/v2\/media?parent=13493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}