{"id":11648,"date":"2025-12-22T16:34:05","date_gmt":"2025-12-22T08:34:05","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11648"},"modified":"2026-06-25T10:23:02","modified_gmt":"2026-06-25T02:23:02","slug":"a2-tool-steel-heat-treatment-guide","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/a2-tool-steel-heat-treatment-guide\/","title":{"rendered":"Tratamento t\u00e9rmico do a\u00e7o ferramenta A2: 1750\u00b0F, 58\u201362 HRC | A\u00e7o Aobo"},"content":{"rendered":"<section class=\"aobo-a2-heat-treatment-page\">\n  <style>\n    .aobo-a2-heat-treatment-page {\n      --aobo-blue: #0c56d0;\n      --aobo-blue-dark: #073b8e;\n      --aobo-blue-soft: #eaf2ff;\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:inherit;\n      color: var(--aobo-text);\n      line-height: 1.7;\n      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}\n    }\n  <\/style>\n\n  <div class=\"aobo-wrap\">\n    <header class=\"aobo-hero\">\n      <span class=\"aobo-eyebrow\">Guia de Tratamento T\u00e9rmico de A\u00e7o para Ferramentas A2<\/span>\n      <h1>Guia de Tratamento T\u00e9rmico de A\u00e7o para Ferramentas A2<\/h1>\n      <p><a href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">A\u00e7o para ferramentas A2<\/a> O a\u00e7o \u00e9 tipicamente tratado termicamente por pr\u00e9-aquecimento a 650-675 \u00b0C (1200-1250 \u00b0F), austenitiza\u00e7\u00e3o a 955-970 \u00b0C (1750-1775 \u00b0F), t\u00eampera ao ar e um ciclo de revenido duplo a 205-230 \u00b0C (400-450 \u00b0F). Sob condi\u00e7\u00f5es controladas, esse processo produz uma dureza de trabalho est\u00e1vel de 58-62 HRC com uma combina\u00e7\u00e3o equilibrada de resist\u00eancia ao desgaste, tenacidade e estabilidade dimensional.<\/p>\n      <p>O tratamento t\u00e9rmico do a\u00e7o A2 foi projetado para controlar a dureza, a resist\u00eancia ao desgaste, a tenacidade e a estabilidade dimensional dentro de uma faixa estreita de processamento. Como um a\u00e7o ferramenta para trabalho a frio com t\u00eampera ao ar, o A2 reduz a tens\u00e3o de t\u00eampera em compara\u00e7\u00e3o com os a\u00e7os com t\u00eampera em \u00f3leo ou \u00e1gua, mas permanece sens\u00edvel ao controle de temperatura, \u00e0 dimens\u00e3o da se\u00e7\u00e3o transversal e ao comportamento de transforma\u00e7\u00e3o.<\/p>\n    <\/header>\n\n    <main class=\"aobo-article\">\n      <section class=\"aobo-supply-block\" aria-label=\"Consulta e detalhes do produto em a\u00e7o ferramenta A2\">\n        <div class=\"aobo-supply-image\">\n          <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/03\/A2-MATERIAL.webp\" alt=\"Barra de a\u00e7o ferramenta A2\" loading=\"lazy\">\n        <\/div>\n        <div class=\"aobo-supply-content\">\n          <h2>Precisa de A2 pronto para tratamento t\u00e9rmico?<\/h2>\n          <p>A Aobo Steel fornece a\u00e7o A2 recozido com composi\u00e7\u00e3o est\u00e1vel para endurecimento previs\u00edvel. Envie suas dimens\u00f5es e quantidades ou consulte as especifica\u00e7\u00f5es completas do produto.<\/p>\n          <div class=\"aobo-supply-actions\">\n            <a class=\"aobo-btn aobo-btn-primary popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n            <a class=\"aobo-btn aobo-btn-secondary\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">Veja os detalhes do a\u00e7o ferramenta A2.<\/a>\n          <\/div>\n        <\/div>\n      <\/section>\n\n      <h2>Guia r\u00e1pido do processo de tratamento t\u00e9rmico do a\u00e7o ferramenta A2<\/h2>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>Etapa<\/th><th>Temperatura<\/th><th>Tempo<\/th><th>Finalidade<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>Pr\u00e9-aquecimento<\/td><td>1200-1250\u00b0F (650-675\u00b0C)<\/td><td>At\u00e9 que se iguale<\/td><td>Reduzir os gradientes t\u00e9rmicos<\/td><\/tr>\n            <tr><td>Austenitiza\u00e7\u00e3o<\/td><td>1750-1775\u00b0F (955-970\u00b0C)<\/td><td>Aproximadamente 1 hora por se\u00e7\u00e3o de 2,5 cm (1 polegada)<\/td><td>Forma austenita<\/td><\/tr>\n            <tr><td>Resfriamento<\/td><td>Ar a aproximadamente 150\u00b0F (65\u00b0C)<\/td><td>\u2013<\/td><td>Forma martensita<\/td><\/tr>\n            <tr><td>Primeiro temperamento<\/td><td>400-450F (205-230C)<\/td><td>2 horas por polegada<\/td><td>Alivie o estresse<\/td><\/tr>\n            <tr><td>Segundo temperamento<\/td><td>Ligeiramente mais baixo (~25\u00b0F \/ 15\u00b0C)<\/td><td>2 horas por polegada<\/td><td>Estabilizar a estrutura<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Processo de tratamento t\u00e9rmico passo a passo para a\u00e7o ferramenta A2<\/h2>\n      <h3>1. Pr\u00e9-aquecimento<\/h3>\n      <p>O pr\u00e9-aquecimento a 1200-1250\u00b0F garante uma distribui\u00e7\u00e3o uniforme da temperatura e reduz a tens\u00e3o interna antes da transforma\u00e7\u00e3o. Um pr\u00e9-aquecimento insuficiente aumenta o risco de distor\u00e7\u00e3o e fissuras.<\/p>\n\n      <h3>2. Austenitiza\u00e7\u00e3o<\/h3>\n      <p>A austenitiza\u00e7\u00e3o a 1750-1775\u00b0F transforma a estrutura em austenita e dissolve parcialmente os carbonetos da liga. O tempo de perman\u00eancia \u00e9 baseado na espessura da se\u00e7\u00e3o, tipicamente cerca de uma hora por polegada ap\u00f3s a pe\u00e7a atingir a temperatura m\u00e1xima do forno. Temperaturas excessivas aumentam a austenita retida e reduzem a estabilidade da dureza, enquanto temperaturas insuficientes levam a um endurecimento incompleto.<\/p>\n\n      <h3>3. T\u00eampera<\/h3>\n      <p>O resfriamento r\u00e1pido \u00e9 realizado em ar parado ou em g\u00e1s controlado. A pe\u00e7a deve ser resfriada a aproximadamente 65 \u00b0C (150 \u00b0F) antes do revenimento. Para se\u00e7\u00f5es com di\u00e2metro superior a cerca de 127 mm (5 polegadas), o resfriamento ao ar pode n\u00e3o atingir a dureza total no n\u00facleo, sendo necess\u00e1rios m\u00e9todos alternativos de resfriamento.<\/p>\n      <figure class=\"aobo-figure\">\n        <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/A2-Isothermal-Transformation-Diagram.avif\" alt=\"Diagrama de transforma\u00e7\u00e3o isot\u00e9rmica A2\">\n        <figcaption>A2: Diagrama de Transforma\u00e7\u00e3o Isot\u00e9rmica. 0,97 C, 0,48 Mn, 0,40 Si, 4,58 Cr, 1,04 Mo, 0,25 V. Condi\u00e7\u00e3o anterior: recozido. Temperatura de austenitiza\u00e7\u00e3o: 1010 \u00b0C (1850 \u00b0F). Fonte da figura: Guia do Tratador T\u00e9rmico: Pr\u00e1ticas e Procedimentos para Ferros e A\u00e7os, ASM International, 1995, p. 545.<\/figcaption>\n      <\/figure>\n\n      <h3>4. T\u00eampera<\/h3>\n      <p>O revenimento \u00e9 realizado imediatamente ap\u00f3s a t\u00eampera. O primeiro revenimento a 400-450\u00b0F (204-232\u00b0C) reduz a tens\u00e3o interna e ajusta a dureza. Ap\u00f3s o resfriamento, um segundo revenimento \u00e9 necess\u00e1rio para estabilizar a estrutura e evitar fissuras durante o uso.<\/p>\n\n      <h3>5. Tratamento opcional para temperaturas abaixo de zero\/criog\u00eanico<\/h3>\n      <p>O tratamento subzero ou criog\u00eanico pode ser aplicado ap\u00f3s o resfriamento r\u00e1pido para melhorar a estabilidade dimensional e a consist\u00eancia da dureza. Esse tratamento transforma a austenita retida em martensita e deve sempre ser seguido por revenido.<\/p>\n\n      <h2>Dureza e t\u00eampera do a\u00e7o ferramenta A2<\/h2>\n      <p>Ap\u00f3s a t\u00eampera, o a\u00e7o ferramenta A2 atinge uma dureza de aproximadamente 64-65 HRC. O desempenho em uso \u00e9 determinado pela temperatura de revenido selecionada.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>Faixa de t\u00eampera<\/th><th>Dureza t\u00edpica<\/th><th>Uso pr\u00e1tico<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>250-400\u00b0F (120-200\u00b0C)<\/td><td>60-63 HRC<\/td><td>M\u00e1xima resist\u00eancia ao desgaste<\/td><\/tr>\n            <tr><td>400-450F (205-230C)<\/td><td>58-62 HRC<\/td><td>Aplica\u00e7\u00f5es padr\u00e3o de trabalho a frio<\/td><\/tr>\n            <tr><td>~500F (260\u00b0C)<\/td><td>Diminuindo<\/td><td>Evitar (risco de fragiliza\u00e7\u00e3o)<\/td><\/tr>\n            <tr><td>950-1000F (510-540C)<\/td><td>56-57 HRC<\/td><td>Maior resist\u00eancia e estabilidade.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Dureza do a\u00e7o ferramenta A2 ap\u00f3s tratamento t\u00e9rmico<\/h2>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>Est\u00e1gio de tratamento t\u00e9rmico<\/th><th>Dureza t\u00edpica<\/th><th>Significado pr\u00e1tico<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>Condi\u00e7\u00e3o de recozimento<\/td><td>201-241 HB<\/td><td>Condi\u00e7\u00f5es de usinagem<\/td><\/tr>\n            <tr><td>condi\u00e7\u00e3o ap\u00f3s t\u00eampera<\/td><td>64-65 HRC<\/td><td>N\u00e3o adequado para uso.<\/td><\/tr>\n            <tr><td>Condi\u00e7\u00e3o temperada padr\u00e3o<\/td><td>58-62 HRC<\/td><td>Dureza de trabalho t\u00edpica<\/td><\/tr>\n            <tr><td>Temperado a aproximadamente 400\u00b0F (205\u00b0C)<\/td><td>60-61 HRC<\/td><td>Resist\u00eancia ao desgaste focada<\/td><\/tr>\n            <tr><td>Temperado a 950-1000F (510-540C)<\/td><td>53-57 HRC<\/td><td>Foco na resist\u00eancia<\/td><\/tr>\n            <tr><td>Tratamento criog\u00eanico + t\u00eampera<\/td><td>61-62 HRC<\/td><td>Estabilidade aprimorada<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>O a\u00e7o A2 \u00e9 normalmente utilizado na condi\u00e7\u00e3o temperada. Temperaturas de t\u00eampera mais baixas favorecem a resist\u00eancia ao desgaste, enquanto temperaturas mais altas melhoram a tenacidade e a estabilidade dimensional.<\/p>\n\n      <h2>Tratamento t\u00e9rmico do a\u00e7o ferramenta A2 por aplica\u00e7\u00e3o<\/h2>\n      <p>A sele\u00e7\u00e3o do tratamento t\u00e9rmico para o a\u00e7o ferramenta A2 deve ser baseada no modo de falha predominante, e n\u00e3o na dureza m\u00e1xima.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>Foco na aplica\u00e7\u00e3o<\/th><th>Ferramentas t\u00edpicas<\/th><th>Estrat\u00e9gia de tratamento t\u00e9rmico<\/th><th>Dureza resultante<\/th><th>Resultado principal<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>M\u00e1xima resist\u00eancia ao desgaste<\/td><td>Matrizes de corte, l\u00e2minas de corte, facas de corte longitudinal<\/td><td>T\u00eampera dupla a baixa temperatura (~400F \/ 205C)<\/td><td>60-62 HRC<\/td><td>Reten\u00e7\u00e3o m\u00e1xima de borda<\/td><\/tr>\n            <tr><td>Desgaste e resist\u00eancia equilibrados<\/td><td>Pun\u00e7\u00f5es, ferramentas de conforma\u00e7\u00e3o<\/td><td>t\u00eampera controlada<\/td><td>58-60 HRC<\/td><td>Redu\u00e7\u00e3o de lascas<\/td><\/tr>\n            <tr><td>M\u00e1xima resist\u00eancia<\/td><td>Ferramentas carregadas de impacto<\/td><td>Tempera de alta temperatura<\/td><td>56-58 HRC<\/td><td>Melhor resist\u00eancia \u00e0 fratura<\/td><\/tr>\n            <tr><td>Estabilidade dimensional<\/td><td>Ferramentas de precis\u00e3o, medidores<\/td><td>Criogenia + t\u00eampera<\/td><td>60-62 HRC<\/td><td>Controle de tamanho est\u00e1vel<\/td><\/tr>\n            <tr><td>resist\u00eancia ao desgaste superficial<\/td><td>aplica\u00e7\u00f5es abrasivas<\/td><td>Nitreta\u00e7\u00e3o<\/td><td>Superf\u00edcie &gt; n\u00facleo<\/td><td>Vida \u00fatil da superf\u00edcie aprimorada<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Problemas comuns de tratamento t\u00e9rmico e suas solu\u00e7\u00f5es no a\u00e7o ferramenta A2<\/h2>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr><th>Problema<\/th><th>Causa raiz<\/th><th>Solu\u00e7\u00e3o pr\u00e1tica<\/th><\/tr>\n          <\/thead>\n          <tbody>\n            <tr><td>Austenita retida excessiva \/ dureza inst\u00e1vel<\/td><td>Superaquecimento durante a austenitiza\u00e7\u00e3o<\/td><td>Controle a temperatura; aplique tratamento criog\u00eanico, se necess\u00e1rio.<\/td><\/tr>\n            <tr><td>Trincas tardias ap\u00f3s t\u00eampera<\/td><td>martensita n\u00e3o temperada sob alta tens\u00e3o<\/td><td>Comece a t\u00eampera a aproximadamente 150\u00b0F imediatamente.<\/td><\/tr>\n            <tr><td>Fragiliza\u00e7\u00e3o<\/td><td>Revenimento pr\u00f3ximo a 500\u00b0F (260\u00b0C)<\/td><td>Evite esta faixa de temperatura; aplique t\u00eampera dupla.<\/td><\/tr>\n            <tr><td>amolecimento ou fragilidade da superf\u00edcie<\/td><td>Atmosfera inadequada da fornalha<\/td><td>Utilize atmosfera controlada; remova a camada afetada.<\/td><\/tr>\n            <tr><td>Distor\u00e7\u00e3o ou dureza irregular<\/td><td>Aquecimento n\u00e3o uniforme ou se\u00e7\u00e3o transversal de grandes dimens\u00f5es<\/td><td>Pr\u00e9-aquecimento adequado; aquecimento e resfriamento controlados<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>O tratamento t\u00e9rmico est\u00e1vel do a\u00e7o A2 depende do controle consistente da temperatura, do aquecimento uniforme e da sequ\u00eancia adequada de t\u00eampera e revenido. Recomenda-se o al\u00edvio de tens\u00f5es antes da t\u00eampera para pe\u00e7as de precis\u00e3o, e atmosferas controladas s\u00e3o necess\u00e1rias para evitar a degrada\u00e7\u00e3o da superf\u00edcie. Se\u00e7\u00f5es grandes requerem aten\u00e7\u00e3o especial para garantir uma distribui\u00e7\u00e3o uniforme da dureza.<\/p>\n      <p>O a\u00e7o ferramenta A2 apresenta limita\u00e7\u00f5es relacionadas \u00e0 dimens\u00e3o da se\u00e7\u00e3o transversal, sensibilidade \u00e0 temperatura e estabilidade. Se\u00e7\u00f5es transversais grandes podem n\u00e3o endurecer completamente ao ar, e a austenitiza\u00e7\u00e3o deve ser controlada dentro de uma faixa estreita. Rea\u00e7\u00f5es superficiais em altas temperaturas exigem atmosferas controladas, e o revenimento inadequado pode reduzir a tenacidade ou a estabilidade.<\/p>\n    <\/main>\n\n    <section class=\"aobo-related-pages\" aria-label=\"P\u00e1ginas relacionadas ao a\u00e7o ferramenta A2\">\n      <h2>P\u00e1ginas relacionadas<\/h2>\n      <div class=\"aobo-related-grid\">\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel-properties\/\">\n          <strong>Propriedades do a\u00e7o para ferramentas A2<\/strong>\n          <span>Informa\u00e7\u00f5es completas sobre a composi\u00e7\u00e3o qu\u00edmica, dureza, resist\u00eancia ao desgaste, tenacidade e classes equivalentes do A2 para sele\u00e7\u00e3o do material.<\/span>\n        <\/a>\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel-hardness\/\">\n          <strong>Tabela de dureza do a\u00e7o ferramenta A2<\/strong>\n          <span>Valores HRC por condi\u00e7\u00e3o e temperatura de revenido, com a dureza de trabalho recomendada para cada aplica\u00e7\u00e3o de ferramenta de trabalho a frio.<\/span>\n        <\/a>\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel-machining-fabrication-guide\/\">\n          <strong>Guia de Usinagem de A\u00e7o Ferramenta A2<\/strong>\n          <span>Velocidades de corte, classifica\u00e7\u00f5es de usinabilidade, pr\u00e1ticas de fura\u00e7\u00e3o, retifica\u00e7\u00e3o, eletroeros\u00e3o e soldagem para A2 recozido e temperado<\/span>\n        <\/a>\n        <a class=\"aobo-related-card\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel-applications\/\">\n          <strong>Aplica\u00e7\u00f5es do a\u00e7o ferramenta A2<\/strong>\n          <span>Onde o A2 se encaixa nas ferramentas de trabalho a frio e como selecion\u00e1-lo pelo modo de falha, em vez de apenas pelas propriedades do material.<\/span>\n        <\/a>\n      <\/div>\n    <\/section>\n\n    <section class=\"aobo-final-cta\">\n      <div>\n        <h2>Precisa de a\u00e7o A2 com tratamento t\u00e9rmico controlado?<\/h2>\n        <p>Envie-nos as especifica\u00e7\u00f5es da sua classe de a\u00e7o, dimens\u00f5es, quantidade, dureza desejada, aplica\u00e7\u00e3o e requisitos de tratamento t\u00e9rmico. A Aobo Steel pode ajudar a adequar o fornecimento e o processamento de a\u00e7o A2 \u00e0s suas condi\u00e7\u00f5es de ferramental.<\/p>\n      <\/div>\n      <div class=\"aobo-cta-buttons\">\n        <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">Veja os detalhes do a\u00e7o ferramenta A2.<\/a>\n        <a class=\"aobo-btn popmake-16052\" href=\"javascript:void(0);\">Enviar consulta<\/a>\n      <\/div>\n    <\/section>\n  <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>A2 Tool Steel Heat Treatment Guide A2 Tool Steel Heat Treatment Guide A2 tool steel is typically heat-treated by preheating to 1200-1250F (650-675C), austenitizing at 1750-1775F (955-970C), air quenching, and a double-tempering cycle at 400-450F (205-230C). Under controlled conditions, this process produces a stable working hardness of 58-62 HRC with a balanced combination of wear [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15096,"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-11648","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>A2 Tool Steel Heat Treatment: 1750\u00b0F, 58\u201362 HRC | Aobo Steel<\/title>\n<meta name=\"description\" content=\"Austenitize at 1750\u20131775\u00b0F, air-quench, double-temper at 400\u2013450\u00b0F. 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