{"id":16428,"date":"2026-07-01T11:13:59","date_gmt":"2026-07-01T03:13:59","guid":{"rendered":"https:\/\/aobosteel.com\/?p=16428"},"modified":"2026-07-01T11:14:01","modified_gmt":"2026-07-01T03:14:01","slug":"tool-steel-delivery-conditions","status":"publish","type":"post","link":"https:\/\/aobosteel.com\/pt\/blog\/tool-steel-delivery-conditions\/","title":{"rendered":"Condi\u00e7\u00f5es de entrega de a\u00e7o ferramenta | Fornecedor de a\u00e7o Aobo"},"content":{"rendered":"

Condi\u00e7\u00f5es de fornecimento de a\u00e7o ferramenta: Recozido, Pr\u00e9-endurecido, QT e ESR<\/h1>\n\n\n\n

Ao fazer um pedido de a\u00e7o para ferramentas, a especifica\u00e7\u00e3o da classe representa apenas metade da complexidade. Voc\u00ea tamb\u00e9m especifica a condi\u00e7\u00e3o de entrega, que determina o estado em que a barra ou o bloco chega, a quantidade de usinagem e tratamento t\u00e9rmico necess\u00e1rios e o custo entre a mat\u00e9ria-prima e a ferramenta acabada. Escolher a condi\u00e7\u00e3o errada significa pagar por uma pureza que o trabalho nunca precisou ou aceitar um risco de distor\u00e7\u00e3o que poderia ter sido evitado no projeto. Este guia aborda as quatro condi\u00e7\u00f5es mais frequentemente solicitadas e quando cada uma delas \u00e9 a escolha certa.<\/p>\n\n\n\n

Recozido<\/h2>\n\n\n\n

O recozimento \u00e9 a condi\u00e7\u00e3o padr\u00e3o de entrega para a maioria dos a\u00e7os ferramenta. A usina aquece o a\u00e7o, mant\u00e9m-no nessa condi\u00e7\u00e3o e o resfria lentamente no forno, geralmente por meio de um recozimento de esferoidiza\u00e7\u00e3o que concentra o carbono em part\u00edculas arredondadas de carboneto dentro de uma matriz de ferrita macia. O resultado \u00e9 o estado mais macio que o a\u00e7o pode atingir.<\/p>\n\n\n\n

A raz\u00e3o para comprar material recozido \u00e9 a usinabilidade. O a\u00e7o macio corta rapidamente, mant\u00e9m a toler\u00e2ncia durante o desbaste e permite que o ferramenteiro corte uma matriz ou pun\u00e7\u00e3o com geometria pr\u00f3xima \u00e0 final sem que a ferramenta ofere\u00e7a resist\u00eancia. Ele tamb\u00e9m n\u00e3o apresenta tens\u00f5es residuais provenientes da lamina\u00e7\u00e3o ou forjamento, de modo que o bloco se comporta de forma previs\u00edvel na m\u00e1quina. A desvantagem \u00e9 que o a\u00e7o recozido n\u00e3o possui dureza de trabalho. Ap\u00f3s a usinagem, o ferramenteiro endurece e revene a pe\u00e7a internamente para atingir a resist\u00eancia ao desgaste exigida pela aplica\u00e7\u00e3o, o que significa realizar essa etapa internamente ou terceiriz\u00e1-la, aceitando a pequena varia\u00e7\u00e3o dimensional que ela acarreta.<\/p>\n\n\n\n

Pr\u00e9-endurecido<\/h2>\n\n\n\n

O a\u00e7o pr\u00e9-endurecido chega j\u00e1 tratado termicamente para uma dureza de trabalho moderada, normalmente em torno de 28-35 HRC, ou aproximadamente 300 HB. P20<\/a> Os a\u00e7os 4140 e 415 s\u00e3o exemplos comuns, amplamente utilizados para bases de moldes, blocos de suporte e pe\u00e7as de m\u00e1quinas em geral.<\/p>\n\n\n\n

A vantagem do pr\u00e9-endurecimento \u00e9 que ele elimina a necessidade de um tratamento t\u00e9rmico ap\u00f3s a usinagem. O endurecimento de uma matriz ou molde totalmente usinado \u00e9 exatamente onde a distor\u00e7\u00e3o, o empenamento e as trincas causam danos, e em uma cavidade complexa, esse risco \u00e9 muito caro. Um bloco pr\u00e9-endurecido \u00e9 usinado diretamente at\u00e9 a dimens\u00e3o final e entra em servi\u00e7o sem nenhum processamento t\u00e9rmico adicional, portanto, a geometria que sai da m\u00e1quina \u00e9 a geometria que voc\u00ea mant\u00e9m. O custo \u00e9 o desgaste da ferramenta, j\u00e1 que cortar a\u00e7o endurecido \u00e9 mais lento e desgasta mais as pastilhas do que cortar um bloco recozido. Para aplica\u00e7\u00f5es que n\u00e3o exigem dureza extrema, a compensa\u00e7\u00e3o geralmente vale a pena.<\/p>\n\n\n\n

QT (Temperado e Revenido)<\/h2>\n\n\n\n

QT significa temperado e revenido, e descreve a sequ\u00eancia completa de endurecimento, em vez de um grau de usinabilidade. A entrega pr\u00e9-endurecida \u00e9 uma forma comercial de QT destinada a facilitar a usinagem, mas chapas e blocos tamb\u00e9m s\u00e3o vendidos na condi\u00e7\u00e3o QT puramente por sua resist\u00eancia estrutural e tenacidade imediatas.<\/p>\n\n\n\n

A t\u00eampera aquece o a\u00e7o at\u00e9 sua temperatura de austenitiza\u00e7\u00e3o e o resfria rapidamente em \u00e1gua, \u00f3leo, ar ou sal, o que aprisiona a estrutura como martensita. A martensita \u00e9 muito dura, por\u00e9m quebradi\u00e7a e repleta de tens\u00f5es internas, portanto, nunca \u00e9 utiliz\u00e1vel por si s\u00f3. O revenido segue imediatamente, reaquecendo o a\u00e7o a uma temperatura mais baixa para restaurar a tenacidade e a estabilidade dimensional, ao custo de uma ligeira perda da dureza m\u00e1xima. Uma pe\u00e7a entregue como tratada termicamente por t\u00eampera j\u00e1 passou por esse ciclo e chega com uma combina\u00e7\u00e3o equilibrada de limite de escoamento e tenacidade ao entalhe.<\/p>\n\n\n\n

ESR (Refus\u00e3o por Eletroesc\u00f3ria)<\/h2>\n\n\n\n

ESR n\u00e3o \u00e9 um tratamento t\u00e9rmico. \u00c9 um processo de fus\u00e3o secund\u00e1ria que proporciona limpeza metal\u00fargica, e seu pre\u00e7o reflete isso.<\/p>\n\n\n\n

Um lingote de fundi\u00e7\u00e3o serve como eletrodo consum\u00edvel que derrete gota a gota em um banho de esc\u00f3ria fundida reativa dentro de um molde de cobre refrigerado a \u00e1gua. \u00c0 medida que cada gota passa pela esc\u00f3ria, inclus\u00f5es de enxofre e \u00f3xidos n\u00e3o met\u00e1licos s\u00e3o removidas e, como o molde conduz o calor em uma dire\u00e7\u00e3o espec\u00edfica, o a\u00e7o refinado solidifica de baixo para cima. Essa solidifica\u00e7\u00e3o controlada elimina a porosidade central, a forma\u00e7\u00e3o de tubos e a segrega\u00e7\u00e3o encontradas em lingotes convencionais, resultando em um a\u00e7o limpo, uniforme em todas as dire\u00e7\u00f5es e altamente resistente \u00e0 fadiga e ao trincamento. Como o processo \u00e9 lento e custoso, a Resfriamento por Esc\u00f3ria Eletroqu\u00edmica (ESR) \u00e9 reservada para matrizes, rolamentos e ferramentas aeroespaciais mais exigentes, onde uma falha inesperada n\u00e3o \u00e9 aceit\u00e1vel.<\/p>\n\n\n\n

Para obter uma descri\u00e7\u00e3o completa do processo e saber quando o pr\u00eamio se justifica, consulte nosso guia espec\u00edfico sobre o assunto. A\u00e7o ferramenta ESR<\/a>.<\/p>\n\n\n\n

Como escolher uma condi\u00e7\u00e3o de entrega<\/h2>\n\n\n\n

A condi\u00e7\u00e3o decorre do n\u00edvel de risco que voc\u00ea deseja minimizar com o tratamento t\u00e9rmico. Se voc\u00ea precisa de dureza m\u00e1xima e quer controlar o endurecimento, encomende a pe\u00e7a recozida e corte-a em uma condi\u00e7\u00e3o mais macia. Se a pe\u00e7a n\u00e3o requer dureza extrema e voc\u00ea deseja evitar o tratamento t\u00e9rmico p\u00f3s-usinagem e o risco de distor\u00e7\u00e3o associado, encomende a pe\u00e7a pr\u00e9-endurecida ou com tratamento t\u00e9rmico r\u00e1pido (QT). Se a ferramenta opera sob forte fadiga ou em uma fun\u00e7\u00e3o cr\u00edtica para a seguran\u00e7a, o tratamento t\u00e9rmico de endurecimento por in\u00e9rcia (ESR) justifica seu pre\u00e7o mais elevado; para ferramentas de uso geral, n\u00e3o.<\/p>\n\n\n\n

A qualidade, o estado de conserva\u00e7\u00e3o e as dimens\u00f5es da se\u00e7\u00e3o s\u00e3o cotados em conjunto, portanto, especificar o estado de conserva\u00e7\u00e3o antecipadamente evita novas cota\u00e7\u00f5es e mant\u00e9m o prazo de entrega previs\u00edvel.<\/p>\n\n\n\n

Condi\u00e7\u00e3o<\/td>Estado no momento da entrega<\/td>Usinabilidade<\/td>Tratamento t\u00e9rmico ap\u00f3s usinagem<\/td>Uso t\u00edpico<\/td><\/tr>
Recozido<\/td>Estado mais suave<\/td>Melhor<\/td>Obrigat\u00f3rio, feito pelo ferramenteiro<\/td>Matrizes e pun\u00e7\u00f5es que necessitam de t\u00eampera total<\/td><\/tr>
Pr\u00e9-endurecido<\/td>28 a 35 HRC<\/td>Moderado<\/td>Nenhum<\/td>Bases de moldes, blocos de suporte, pe\u00e7as de m\u00e1quinas<\/td><\/tr>
QT<\/td>Endurecido e temperado<\/td>Moderado<\/td>Nenhum<\/td>Placa estrutural e bloco que necessitam de resist\u00eancia<\/td><\/tr>
ESR<\/td>Lingote refinado, fornecido recozido ou QT<\/td>Depende do estado final.<\/td>Depende do estado final.<\/td>Matrizes, rolamentos e componentes aeroespaciais sujeitos a fadiga<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

A Aobo Steel fornece seus principais a\u00e7os para trabalho a frio e a quente nas condi\u00e7\u00f5es recozida, pr\u00e9-endurecida e ESR, com tratamento t\u00e9rmico r\u00e1pido (QT) dispon\u00edvel em chapas e blocos sob encomenda. Caso n\u00e3o tenha certeza de qual condi\u00e7\u00e3o melhor se adapta ao seu processo, envie-nos a especifica\u00e7\u00e3o do a\u00e7o e os requisitos da pe\u00e7a acabada, e confirmaremos a condi\u00e7\u00e3o de entrega correta antes de enviar a cota\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

Tool Steel Delivery Conditions: Annealed, Pre-Hardened, QT, and ESR When you place a tool steel order, the grade is only half the specification. You also specify the delivery condition, which determines the state the bar or block arrives in, the amount of machining and heat treatment required, and the cost between the raw material and […]<\/p>\n","protected":false},"author":1,"featured_media":16429,"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 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