{"id":15332,"date":"2026-05-14T15:08:38","date_gmt":"2026-05-14T07:08:38","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=15332"},"modified":"2026-06-25T10:38:59","modified_gmt":"2026-06-25T02:38:59","slug":"air-hardening-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/air-hardening-tool-steel\/","title":{"rendered":"A\u00e7o ferramenta para t\u00eampera ao ar: significado, benef\u00edcios e sele\u00e7\u00e3o de classe."},"content":{"rendered":"<section class=\"aobo-air-hardening-page\">\n\n  <style>\n    .aobo-air-hardening-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: 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    .aobo-hero {\n        padding: 30px 22px;\n      }\n\n      .aobo-product-grid {\n        grid-template-columns: 1fr;\n      }\n\n      .aobo-product-strip {\n        padding: 20px;\n      }\n\n      .aobo-buttons {\n        flex-direction: column;\n      }\n\n      .aobo-article h2 {\n        font-size: 25px;\n      }\n    }\n  <\/style>\n\n  <div class=\"aobo-wrap\">\n\n    <header class=\"aobo-hero\">\n      <span class=\"aobo-eyebrow\">Guia T\u00e9cnico de A\u00e7os para Ferramentas<\/span>\n      <h1>O que \u00e9 a\u00e7o ferramenta de t\u00eampera ao ar e como funciona?<\/h1>\n      <p>\n        O a\u00e7o ferramenta de t\u00eampera ao ar \u00e9 um a\u00e7o ferramenta de alta liga que pode formar martensita por meio de resfriamento ao ar ou a g\u00e1s, em vez de t\u00eampera l\u00edquida severa. Sua principal vantagem \u00e9 a estabilidade dimensional, o que o torna \u00fatil para matrizes de precis\u00e3o, moldes, calibradores, l\u00e2minas e ferramentas complexas onde a distor\u00e7\u00e3o por tratamento t\u00e9rmico deve ser controlada.\n      <\/p>\n    <\/header>\n\n    <section class=\"aobo-product-strip\" aria-label=\"A\u00e7os para ferramentas de t\u00eampera ao ar dispon\u00edveis na Aobo Steel.\">\n      <h2>A\u00e7os para ferramentas de t\u00eampera ao ar dispon\u00edveis na Aobo Steel.<\/h2>\n      <p class=\"aobo-strip-intro\">\n        A Aobo Steel fornece a\u00e7os-ferramenta de t\u00eampera ao ar em barras redondas e planas a granel para ferramentas de precis\u00e3o, matrizes de trabalho a frio, ferramentas de trabalho a quente, ferramentas resistentes a choques e ferramentas de corte de alta velocidade.\n      <\/p>\n\n      <div class=\"aobo-product-grid\">\n\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/03\/A2-MATERIAL.webp\" alt=\"Barra de a\u00e7o ferramenta A2\" loading=\"lazy\" decoding=\"async\">\n          <\/div>\n          <h3>A2 | 1,2363 | SKD12<\/h3>\n          <p class=\"aobo-card-note\">Classe de trabalho a frio equilibrada para tenacidade, resist\u00eancia ao desgaste e estabilidade dimensional.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">Ver detalhes<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n          <\/div>\n        <\/article>\n\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/03\/D2-tool-steel.avif\" alt=\"Barra plana de a\u00e7o para ferramentas D2\" loading=\"lazy\" decoding=\"async\">\n          <\/div>\n          <h3>D2 | 1,2379 | SKD11<\/h3>\n          <p class=\"aobo-card-note\">A\u00e7o para trabalho a frio com alta resist\u00eancia ao desgaste, ideal para matrizes, facas e ferramentas de conforma\u00e7\u00e3o de longa dura\u00e7\u00e3o.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/pt\/d2-tool-steel\/\">Ver detalhes<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n          <\/div>\n        <\/article>\n\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/04\/H13-STEEL-FLAT-BAR.avif\" alt=\"Barra plana de a\u00e7o ferramenta H13\" loading=\"lazy\" decoding=\"async\">\n          <\/div>\n          <h3>H13 | 1,2344 | SKD61<\/h3>\n          <p class=\"aobo-card-note\">A\u00e7o ferramenta para trabalho a quente, indicado para fundi\u00e7\u00e3o sob press\u00e3o, extrus\u00e3o a quente, forjamento e resist\u00eancia \u00e0 fadiga t\u00e9rmica.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/pt\/h13-tool-steel\/\">Ver detalhes<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n          <\/div>\n        <\/article>\n\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/04\/S7.webp\" alt=\"Barra de a\u00e7o ferramenta S7\" loading=\"lazy\" decoding=\"async\">\n          <\/div>\n          <h3>S7 | 1,2355<\/h3>\n          <p class=\"aobo-card-note\">A\u00e7o ferramenta resistente a impactos para ferramentas de impacto, pun\u00e7\u00f5es, cinz\u00e9is e l\u00e2minas de corte.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/pt\/s7-tool-steel\/\">Ver detalhes<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n          <\/div>\n        <\/article>\n\n        <article class=\"aobo-product-card\">\n          <div class=\"aobo-product-image\">\n            <img src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/03\/M2-HIGH-SPEED-STEEL.avif\" alt=\"Barra de a\u00e7o r\u00e1pido M2\" loading=\"lazy\" decoding=\"async\">\n          <\/div>\n          <h3>M2 | 1.3343 | SKH51<\/h3>\n          <p class=\"aobo-card-note\">A\u00e7o r\u00e1pido para ferramentas de corte que exigem dureza a quente e resist\u00eancia ao desgaste.<\/p>\n          <div class=\"aobo-buttons\">\n            <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/pt\/m2-tool-steel\/\">Ver detalhes<\/a>\n            <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n          <\/div>\n        <\/article>\n\n      <\/div>\n    <\/section>\n\n    <main class=\"aobo-article\">\n\n      <h2>O que \u00e9 a\u00e7o ferramenta de t\u00eampera ao ar?<\/h2>\n\n      <p>\n        Os a\u00e7os ferramenta de endurecimento ao ar cont\u00eam carbono e elementos de liga suficientes para endurecerem durante o resfriamento ao ar a partir da temperatura de austenitiza\u00e7\u00e3o. No sistema AISI, a s\u00e9rie A \u00e9 o principal grupo de a\u00e7os ferramenta de trabalho a frio de endurecimento ao ar. A2, A6 e A7 s\u00e3o exemplos t\u00edpicos.\n      <\/p>\n\n      <p>\n        Na sele\u00e7\u00e3o pr\u00e1tica de a\u00e7os-ferramenta, o comportamento de endurecimento ao ar tamb\u00e9m se manifesta fora da s\u00e9rie A. A\u00e7os-ferramenta de alta liga como D2, H13, S7, M2 e muitos outros podem ser endurecidos por resfriamento ao ar, ar for\u00e7ado ou g\u00e1s. O ponto em comum \u00e9 a alta temperabilidade.\n      <\/p>\n\n      <p>\n        Temperabilidade significa a capacidade do a\u00e7o de endurecer em toda a sua se\u00e7\u00e3o transversal durante a t\u00eampera. No a\u00e7o ferramenta de t\u00eampera ao ar, uma alta temperabilidade permite que o a\u00e7o endure\u00e7a sem a necessidade de t\u00eampera em \u00e1gua ou \u00f3leo.\n      <\/p>\n\n      <h2>Como funciona o processo de t\u00eampera ao ar do a\u00e7o ferramenta?<\/h2>\n\n      <p>\n        O endurecimento do a\u00e7o depende da forma\u00e7\u00e3o de martensita. Quando o a\u00e7o ferramenta \u00e9 aquecido at\u00e9 sua temperatura de austenitiza\u00e7\u00e3o, sua estrutura se transforma em austenita. Durante o resfriamento, o a\u00e7o deve evitar a forma\u00e7\u00e3o de estruturas mais macias, como perlita ou bainita. Se a taxa de resfriamento for suficientemente alta, a austenita se transforma em martensita.\n      <\/p>\n\n      <p>\n        Os a\u00e7os carbono comuns necessitam de uma alta taxa cr\u00edtica de resfriamento. Devem resfriar muito rapidamente para evitar a forma\u00e7\u00e3o de perlita, portanto, os a\u00e7os de endurecimento em \u00e1gua requerem uma t\u00eampera severa.\n      <\/p>\n\n      <p>\n        Os a\u00e7os ferramenta de t\u00eampera ao ar possuem uma taxa cr\u00edtica de resfriamento mais baixa. Elementos de liga como cromo, molibd\u00eanio, mangan\u00eas, van\u00e1dio e tungst\u00eanio retardam a transforma\u00e7\u00e3o da austenita em perlita ou bainita. Isso d\u00e1 ao a\u00e7o tempo suficiente para atingir a faixa de transforma\u00e7\u00e3o martens\u00edtica durante um resfriamento mais lento.\n      <\/p>\n\n      <p>\n        Consequentemente, o resfriamento a ar ou a g\u00e1s ainda pode produzir martensita. O a\u00e7o endurece, mas a tens\u00e3o de t\u00eampera \u00e9 muito menor do que na t\u00eampera em \u00e1gua ou \u00f3leo.\n      <\/p>\n\n      <h2>Por que o endurecimento ao ar reduz a distor\u00e7\u00e3o e o aparecimento de fissuras<\/h2>\n\n      <p>\n        A distor\u00e7\u00e3o resulta principalmente do resfriamento desigual e da transforma\u00e7\u00e3o desigual.\n      <\/p>\n\n      <p>\n        No processo de t\u00eampera em \u00e1gua ou \u00f3leo, a superf\u00edcie esfria muito mais r\u00e1pido que o n\u00facleo. A superf\u00edcie se contrai primeiro, enquanto o interior permanece quente e expandido. Isso cria tens\u00e3o t\u00e9rmica. Se a tens\u00e3o se tornar muito alta, a ferramenta pode empenar ou rachar.\n      <\/p>\n\n      <p>\n        A forma\u00e7\u00e3o de martensita tamb\u00e9m gera tens\u00f5es, pois o a\u00e7o se expande durante a transforma\u00e7\u00e3o. Em um resfriamento severo, a superf\u00edcie pode se tornar martensita dura enquanto o n\u00facleo ainda \u00e9 austenita quente. Quando o n\u00facleo se transforma e se expande posteriormente, ele exerce press\u00e3o contra a superf\u00edcie j\u00e1 endurecida. Isso pode causar trincas ou deforma\u00e7\u00f5es significativas.\n      <\/p>\n\n      <p>\n        O endurecimento ao ar reduz esse problema. A superf\u00edcie e o n\u00facleo resfriam de maneira mais uniforme. A diferen\u00e7a de temperatura dentro da ferramenta diminui. A transforma\u00e7\u00e3o martens\u00edtica tamb\u00e9m ocorre de forma mais uniforme em toda a se\u00e7\u00e3o. Isso confere aos a\u00e7os-ferramenta endurec\u00edveis ao ar melhor estabilidade dimensional e maior seguran\u00e7a durante o processo de t\u00eampera.\n      <\/p>\n\n      <h2>A\u00e7o ferramenta para t\u00eampera ao ar vs. t\u00eampera em \u00f3leo vs. t\u00eampera em \u00e1gua<\/h2>\n\n      <p>\n        Os a\u00e7os para ferramentas de t\u00eampera em \u00e1gua, em \u00f3leo e ao ar diferem principalmente em termos de teor de liga, temperabilidade, severidade de t\u00eampera e estabilidade dimensional.\n      <\/p>\n\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr>\n              <th>Tipo de a\u00e7o ferramenta<\/th>\n              <th>Notas t\u00edpicas<\/th>\n              <th>Meio de resfriamento<\/th>\n              <th>Principal vantagem<\/th>\n              <th>Limita\u00e7\u00e3o principal<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>A\u00e7o ferramenta endurec\u00edvel em \u00e1gua<\/td>\n              <td>W1, W2, W5<\/td>\n              <td>\u00c1gua ou salmoura<\/td>\n              <td>Baixo custo da liga e boa usinabilidade.<\/td>\n              <td>Maior risco de distor\u00e7\u00e3o e fissuras<\/td>\n            <\/tr>\n            <tr>\n              <td>A\u00e7o ferramenta para t\u00eampera em \u00f3leo<\/td>\n              <td>O1, O2, O6, O7<\/td>\n              <td>\u00d3leo<\/td>\n              <td>Melhor temperabilidade do que os a\u00e7os da s\u00e9rie W.<\/td>\n              <td>Ainda apresenta risco de distor\u00e7\u00e3o por t\u00eampera l\u00edquida<\/td>\n            <\/tr>\n            <tr>\n              <td>A\u00e7o ferramenta de t\u00eampera ao ar<\/td>\n              <td>A2, A6, D2, H13, S7, M2<\/td>\n              <td>Ar, ar for\u00e7ado, g\u00e1s ou refrigera\u00e7\u00e3o controlada<\/td>\n              <td>Melhor estabilidade dimensional e menor risco de fissura\u00e7\u00e3o por t\u00eampera.<\/td>\n              <td>Custo mais elevado da liga e menor usinabilidade<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <p>\n        Os a\u00e7os de endurecimento ao ar s\u00e3o geralmente escolhidos quando a estabilidade dimensional, o endurecimento profundo ou um menor risco de fissura\u00e7\u00e3o s\u00e3o mais importantes do que o custo da mat\u00e9ria-prima.\n      <\/p>\n\n      <h2>A\u00e7os para ferramentas comuns de t\u00eampera ao ar<\/h2>\n\n      <p>\n        Os a\u00e7os ferramenta de endurecimento ao ar n\u00e3o se limitam a um \u00fanico grupo AISI. A s\u00e9rie A \u00e9 a fam\u00edlia cl\u00e1ssica de a\u00e7os para trabalho a frio com endurecimento ao ar, mas muitos a\u00e7os das s\u00e9ries D, H, S e a\u00e7os r\u00e1pidos tamb\u00e9m endurecem por resfriamento a ar ou g\u00e1s.\n      <\/p>\n\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr>\n              <th>Grau<\/th>\n              <th>Fam\u00edlia de a\u00e7os para ferramentas<\/th>\n              <th>Principal for\u00e7a<\/th>\n              <th>Aplica\u00e7\u00f5es t\u00edpicas<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>A2<\/td>\n              <td>A\u00e7o para trabalho a frio com t\u00eampera ao ar<\/td>\n              <td>Equil\u00edbrio entre resist\u00eancia, durabilidade e estabilidade dimensional.<\/td>\n              <td>Matrizes de corte, matrizes de conforma\u00e7\u00e3o, pun\u00e7\u00f5es, calibradores<\/td>\n            <\/tr>\n            <tr>\n              <td>A6<\/td>\n              <td>A\u00e7o para trabalho a frio com t\u00eampera ao ar<\/td>\n              <td>Baixa temperatura de endurecimento e baixa movimenta\u00e7\u00e3o<\/td>\n              <td>Ferramentas de precis\u00e3o, matrizes de servi\u00e7o m\u00e9dio<\/td>\n            <\/tr>\n            <tr>\n              <td>A7<\/td>\n              <td>A\u00e7o para trabalho a frio com t\u00eampera ao ar<\/td>\n              <td>Alt\u00edssima resist\u00eancia \u00e0 abras\u00e3o<\/td>\n              <td>Aplica\u00e7\u00f5es de desgaste abrasivo com choque limitado<\/td>\n            <\/tr>\n            <tr>\n              <td>D2<\/td>\n              <td>A\u00e7o para trabalho a frio com alto teor de carbono e cromo<\/td>\n              <td>Alta resist\u00eancia ao desgaste e boa estabilidade dimensional.<\/td>\n              <td>Matrizes de estampagem de longa dura\u00e7\u00e3o, facas de corte longitudinal, l\u00e2minas de cisalhamento<\/td>\n            <\/tr>\n            <tr>\n              <td>H13<\/td>\n              <td>A\u00e7o para ferramentas de trabalho a quente<\/td>\n              <td>Dureza a quente e resist\u00eancia \u00e0 fadiga t\u00e9rmica<\/td>\n              <td>Matrizes de fundi\u00e7\u00e3o sob press\u00e3o, matrizes de extrus\u00e3o a quente, matrizes de forjamento<\/td>\n            <\/tr>\n            <tr>\n              <td>S7<\/td>\n              <td>A\u00e7o ferramenta resistente a choques<\/td>\n              <td>Alta resist\u00eancia ao impacto com capacidade de endurecimento ao ar.<\/td>\n              <td>Pun\u00e7\u00f5es, cinz\u00e9is, l\u00e2minas de corte, ferramentas de impacto<\/td>\n            <\/tr>\n            <tr>\n              <td>M2<\/td>\n              <td>A\u00e7o r\u00e1pido<\/td>\n              <td>Dureza vermelha e resist\u00eancia ao desgaste por corte<\/td>\n              <td>Ferramentas de corte, fresas, brocas, brocas<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Considera\u00e7\u00f5es sobre o tratamento t\u00e9rmico do a\u00e7o ferramenta para t\u00eampera ao ar<\/h2>\n\n      <p>\n        O a\u00e7o ferramenta de t\u00eampera ao ar requer tratamento t\u00e9rmico controlado. O processo usual inclui recozimento, usinagem, al\u00edvio de tens\u00f5es quando necess\u00e1rio, austenitiza\u00e7\u00e3o, t\u00eampera ao ar ou a g\u00e1s e revenido.\n      <\/p>\n\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr>\n              <th>Etapa de tratamento t\u00e9rmico<\/th>\n              <th>Finalidade<\/th>\n              <th>Ponto-chave<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>Recozimento<\/td>\n              <td>Amaciar o a\u00e7o para usinagem<\/td>\n              <td>Necess\u00e1rio antes de usinagem de grande porte.<\/td>\n            <\/tr>\n            <tr>\n              <td>Al\u00edvio do estresse<\/td>\n              <td>Reduzir o estresse de usinagem<\/td>\n              <td>\u00datil para ferramentas complexas ou com usinagem pesada.<\/td>\n            <\/tr>\n            <tr>\n              <td>Austenitiza\u00e7\u00e3o<\/td>\n              <td>Prepare o a\u00e7o para t\u00eampera.<\/td>\n              <td>A temperatura depende da classe.<\/td>\n            <\/tr>\n            <tr>\n              <td>t\u00eampera a ar ou g\u00e1s<\/td>\n              <td>Forma martensita com menor tens\u00e3o<\/td>\n              <td>O resfriamento ainda deve ser compat\u00edvel com o tamanho da se\u00e7\u00e3o.<\/td>\n            <\/tr>\n            <tr>\n              <td>T\u00eampera<\/td>\n              <td>Reduzir a fragilidade e ajustar a dureza.<\/td>\n              <td>V\u00e1rios ciclos de t\u00eampera s\u00e3o comuns.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <p>\n        A temperatura exata depende da classe do a\u00e7o. Os a\u00e7os A2, D2, H13, S7 e M2 n\u00e3o compartilham o mesmo programa de tratamento t\u00e9rmico. Um a\u00e7o para trabalho a frio, um a\u00e7o para trabalho a quente e um a\u00e7o r\u00e1pido requerem diferentes condi\u00e7\u00f5es de t\u00eampera e revenido.\n      <\/p>\n\n      <p>\n        A prote\u00e7\u00e3o da superf\u00edcie tamb\u00e9m \u00e9 importante. Muitas ligas de a\u00e7o de t\u00eampera ao ar utilizam altas temperaturas de austenitiza\u00e7\u00e3o. Uma atmosfera inadequada no forno pode causar descarboneta\u00e7\u00e3o, deixando uma camada superficial macia. Fornos a v\u00e1cuo, atmosferas controladas, banhos de sal ou m\u00e9todos adequados de embalagem ajudam a reduzir esse risco.\n      <\/p>\n\n      <p>\n        A austenita retida tamb\u00e9m pode afetar a estabilidade dimensional. Um alto teor de liga pode resultar em austenita inst\u00e1vel ap\u00f3s o resfriamento brusco. M\u00faltiplos ciclos de revenido e, por vezes, tratamento criog\u00eanico, ajudam a estabilizar a estrutura antes do uso.\n      <\/p>\n\n      <h2>Quando escolher o a\u00e7o ferramenta de t\u00eampera ao ar?<\/h2>\n\n      <p>\n        Escolha a\u00e7o ferramenta de t\u00eampera ao ar quando a ferramenta precisar de alta dureza com distor\u00e7\u00e3o m\u00ednima por tratamento t\u00e9rmico. \u00c9 especialmente \u00fatil quando o formato da ferramenta torna o resfriamento em \u00e1gua ou \u00f3leo arriscado.\n      <\/p>\n\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr>\n              <th>Exig\u00eancia<\/th>\n              <th>Escolha adequada<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>Baixa distor\u00e7\u00e3o em matrizes de trabalho a frio<\/td>\n              <td>A2 ou D2<\/td>\n            <\/tr>\n            <tr>\n              <td>Melhor equil\u00edbrio entre resist\u00eancia e durabilidade.<\/td>\n              <td>A2<\/td>\n            <\/tr>\n            <tr>\n              <td>Maior resist\u00eancia ao desgaste<\/td>\n              <td>D2 ou a\u00e7os r\u00e1pidos selecionados<\/td>\n            <\/tr>\n            <tr>\n              <td>Trabalho a quente, fundi\u00e7\u00e3o sob press\u00e3o, extrus\u00e3o e forjamento.<\/td>\n              <td>H13<\/td>\n            <\/tr>\n            <tr>\n              <td>Carga de alto impacto<\/td>\n              <td>S7<\/td>\n            <\/tr>\n            <tr>\n              <td>Corte sob calor<\/td>\n              <td>M2<\/td>\n            <\/tr>\n            <tr>\n              <td>Ferramentas e medidores de precis\u00e3o<\/td>\n              <td>A2, A6 ou graus est\u00e1veis semelhantes<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Limita\u00e7\u00f5es do a\u00e7o ferramenta endurecido ao ar<\/h2>\n\n      <p>\n        O a\u00e7o ferramenta de t\u00eampera ao ar tem vantagens claras, mas tamb\u00e9m tem limita\u00e7\u00f5es.\n      <\/p>\n\n      <p>\n        A primeira limita\u00e7\u00e3o \u00e9 a usinabilidade. O alto teor de liga e os carbonetos duros tornam muitos a\u00e7os de t\u00eampera ao ar mais dif\u00edceis de usinar e retificar. Os a\u00e7os da s\u00e9rie A s\u00e3o geralmente menos usin\u00e1veis do que os a\u00e7os de t\u00eampera em \u00e1gua. O D2 \u00e9 ainda mais dif\u00edcil devido ao seu alto volume de carbonetos.\n      <\/p>\n\n      <p>\n        A segunda limita\u00e7\u00e3o \u00e9 o custo. Cromo, molibd\u00eanio, van\u00e1dio, tungst\u00eanio e outros elementos de liga aumentam o custo da mat\u00e9ria-prima. A\u00e7os de t\u00eampera ao ar geralmente custam mais do que os a\u00e7os simples das s\u00e9ries W ou O.\n      <\/p>\n\n      <p>\n        A terceira limita\u00e7\u00e3o \u00e9 a dimens\u00e3o da se\u00e7\u00e3o. Os a\u00e7os de t\u00eampera ao ar t\u00eam endurecimento profundo, mas mesmo assim o ar tem seus limites. Se\u00e7\u00f5es muito grandes podem exigir resfriamento por ar for\u00e7ado, t\u00eampera a g\u00e1s ou outro m\u00e9todo de resfriamento controlado. A escolha correta depende da classe, dimens\u00e3o, geometria e capacidade do forno.\n      <\/p>\n\n      <p>\n        A normaliza\u00e7\u00e3o geralmente n\u00e3o \u00e9 adequada para a\u00e7os ferramenta de t\u00eampera ao ar. O resfriamento ao ar a partir de altas temperaturas pode endurecer o a\u00e7o, transformando-o em martensita fr\u00e1gil. Quando o amolecimento \u00e9 necess\u00e1rio, esses a\u00e7os normalmente requerem recozimento completo em vez de normaliza\u00e7\u00e3o.\n      <\/p>\n\n      <p>\n        O endurecimento ao ar tamb\u00e9m n\u00e3o significa distor\u00e7\u00e3o zero. Aquecimento inadequado, espessura irregular da se\u00e7\u00e3o, resfriamento incorreto, revenimento tardio ou controle deficiente do forno ainda podem causar fissuras, altera\u00e7\u00f5es dimensionais ou redu\u00e7\u00e3o da vida \u00fatil da ferramenta.\n      <\/p>\n\n    <\/main>\n\n    <section class=\"aobo-final-cta\">\n      <h2>Precisa de fornecimento em grande quantidade de a\u00e7o ferramenta para t\u00eampera ao ar?<\/h2>\n      <p>\n        A Aobo Steel fornece barras redondas e barras chatas de a\u00e7o ferramenta para pedidos em grande quantidade. As classes dispon\u00edveis incluem D2, A2, H13, S7, M2 e outros materiais de a\u00e7o ferramenta para aplica\u00e7\u00f5es em ferramentas industriais.\n      <\/p>\n      <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n    <\/section>\n\n  <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>Tool Steel Technical Guide What Is Air-Hardening Tool Steel and How Does It Work? Air-hardening tool steel is a high-alloy tool steel that can form martensite through air or gas cooling instead of severe liquid quenching. Its main value is dimensional stability, which makes it useful for precision dies, molds, gauges, blades, and complex tooling [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15552,"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 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-15332","page","type-page","status-publish","has-post-thumbnail","hentry"],"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>Air-Hardening Tool Steel: Meaning, Benefits and Grade Selection<\/title>\n<meta name=\"description\" content=\"Learn what air-hardening tool steel is, how it reduces distortion during heat treatment, and how grades like A2, D2, H13, S7 and M2 are selected.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aobosteel.com\/pt\/air-hardening-tool-steel\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Air-Hardening Tool Steel: Meaning, Benefits and Grade Selection\" \/>\n<meta property=\"og:description\" content=\"Learn what air-hardening tool steel is, how it reduces distortion during heat treatment, and how grades like A2, D2, H13, S7 and M2 are 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