{"id":20153,"date":"2026-09-28T12:32:50","date_gmt":"2026-09-28T04:32:50","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=20153"},"modified":"2026-10-16T00:12:52","modified_gmt":"2026-10-15T16:12:52","slug":"a9-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/a9-tool-steel-heat-treatment\/","title":{"rendered":"Tratamento t\u00e9rmico do a\u00e7o ferramenta A9"},"content":{"rendered":"

Tratamento t\u00e9rmico do a\u00e7o ferramenta A9<\/h1>\n\n\n\n

A composi\u00e7\u00e3o qu\u00edmica, o ciclo de t\u00eampera e a linha de revenimento que a ficha de origem apresenta para o a\u00e7o ferramenta para trabalho a frio temperado ao ar A9. Um resumo de refer\u00eancia da pr\u00e1tica publicada e n\u00e3o uma especifica\u00e7\u00e3o da Aobo Steel.<\/p>\n\n\n\n

A9 no grupo de trabalho a frio temperado ao ar<\/h2>\n\n\n\n

O A9 pertence ao grupo de trabalho a frio temperado ao ar, e a ficha apresenta a liga como 0,50% de carbono, 5,00% de cromo, 1,40% de molibd\u00eanio, 1,00% de van\u00e1dio, 1,50% de n\u00edquel, 1,00% de sil\u00edcio e 0,40% de mangan\u00eas. O cromo a 5,00% \u00e9 o valor em que se baseia o comportamento de t\u00eampera ao ar, porque mant\u00e9m a temperabilidade alta o suficiente para a pe\u00e7a endurecer enquanto esfria ao ar parado. O n\u00edquel a 1,50% \u00e9 a adi\u00e7\u00e3o que distingue o grau dentro do grupo, e \u00e9 um elemento tenacificante que n\u00e3o forma carbonetos pr\u00f3prios. O molibd\u00eanio e o van\u00e1dio s\u00e3o os formadores de carbonetos a partir dos quais se constr\u00f3i a resist\u00eancia ao desgaste.<\/p>\n\n\n\n

A ficha \u00e9 informa\u00e7\u00e3o de refer\u00eancia de oficina e n\u00e3o uma especifica\u00e7\u00e3o. Apresenta uma etapa de pr\u00e9-aquecimento, uma temperatura de t\u00eampera e um meio de resfriamento, depois um bloco de revenimento que come\u00e7a na dureza como temperado e vai at\u00e9 1000 \u00b0F (540 \u00b0C). Cada valor na ficha \u00e9 um valor \u00fanico e nenhuma faixa de toler\u00e2ncia aparece em nenhum deles. Vale a pena tratar um primeiro lote de pe\u00e7as de um novo vazamento de a\u00e7o como um teste antes que o ciclo entre em produ\u00e7\u00e3o.<\/p>\n\n\n\n

Composi\u00e7\u00e3o qu\u00edmica do A9<\/h2>\n\n\n\n

Elementos listados na ficha de refer\u00eancia, percentual<\/h3>\n\n\n\n
Elemento<\/th>Percentual<\/th><\/tr><\/thead>
Carbono<\/td>0.50<\/td><\/tr>
Manganese<\/td>0.40<\/td><\/tr>
Silicon<\/td>1.00<\/td><\/tr>
Cromo<\/td>5.00<\/td><\/tr>
Molibd\u00eanio<\/td>1.40<\/td><\/tr>
N\u00edquel<\/td>1.50<\/td><\/tr>
Van\u00e1dio<\/td>1.00<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico para A9, p\u00e1gina impressa 183.<\/em><\/p>\n\n\n\n

A ficha apresenta um valor para cada elemento em vez de uma faixa de especifica\u00e7\u00e3o. Tungst\u00eanio, cobalto e enxofre est\u00e3o listados na ficha sem valor correspondente, portanto essas linhas s\u00e3o omitidas da tabela em vez de serem impressas em branco.<\/em><\/p>\n\n\n\n

O cromo a 5,00% sustenta a temperabilidade da qual o ciclo abaixo depende, e \u00e9 tamb\u00e9m o elemento que coloca o grau no grupo de t\u00eampera ao ar em vez do de t\u00eampera em \u00f3leo. O van\u00e1dio a 1,00% e o molibd\u00eanio a 1,40% s\u00e3o os formadores de carbonetos, e o van\u00e1dio adicionalmente mant\u00e9m o tamanho de gr\u00e3o durante a manuten\u00e7\u00e3o de austenitiza\u00e7\u00e3o. O n\u00edquel a 1,50% \u00e9 apresentado como um valor \u00fanico e \u00e9 a adi\u00e7\u00e3o tenacificante na an\u00e1lise. O carbono a 0,50% \u00e9 moderado para um a\u00e7o ferramenta, que \u00e9 de onde vem o equil\u00edbrio entre tenacidade e resist\u00eancia ao desgaste. O mangan\u00eas a 0,40% e o sil\u00edcio a 1,00% tamb\u00e9m s\u00e3o apresentados como valores \u00fanicos. Tungst\u00eanio, cobalto e enxofre est\u00e3o listados na ficha sem valor correspondente, portanto essas linhas s\u00e3o omitidas da tabela. Os dados de composi\u00e7\u00e3o na tabela s\u00e3o apenas para refer\u00eancia geral, os valores reais variam por norma, usina e n\u00famero de vazamento, portanto confirme os valores com o certificado de ensaio do material do vazamento ou consulte a Aobo Steel.<\/p>\n\n\n\n

T\u00eampera do A9<\/h2>\n\n\n\n

Pr\u00e9-aquecimento, temperatura de t\u00eampera e resfriamento<\/h3>\n\n\n\n
Etapa<\/th>A9<\/th><\/tr><\/thead>
Pr\u00e9-aquecimento<\/td>1200 \u00b0F (650 \u00b0C)<\/td><\/tr>
Temperar<\/td>1825 \u00b0F (995 \u00b0C)<\/td><\/tr>
Meio de t\u00eampera<\/td>Resfriamento ao ar<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico para A9, p\u00e1gina impressa 183.<\/em><\/p>\n\n\n\n

A ficha apresenta uma etapa de pr\u00e9-aquecimento, uma temperatura de t\u00eampera e um meio de resfriamento para o grau, sem nenhuma condi\u00e7\u00e3o de tamanho de se\u00e7\u00e3o em nenhum deles, portanto os valores valem para a carga conforme escrito.<\/em><\/p>\n\n\n\n

O pr\u00e9-aquecimento de 1200 \u00b0F (650 \u00b0C) eleva a carga antes que ela atinja a temperatura de austenitiza\u00e7\u00e3o, e a ficha n\u00e3o apresenta nenhuma condi\u00e7\u00e3o para essa etapa, portanto vale para toda carga. A t\u00eampera ocorre a 1825 \u00b0F (995 \u00b0C) seguida de resfriamento ao ar. Graus de t\u00eampera ao ar atingem dureza total apenas at\u00e9 uma se\u00e7\u00e3o transversal limite, e a ficha n\u00e3o apresenta tamanho de se\u00e7\u00e3o para o resfriamento, portanto vale a pena verificar um bloco pesado com seu tratador t\u00e9rmico antes de fixar o ciclo. O resfriamento ao ar \u00e9 tamb\u00e9m a rota mais suave, que \u00e9 a raz\u00e3o pela qual um grau desse tipo \u00e9 escolhido onde a distor\u00e7\u00e3o precisa ser contida. Uma temperatura de t\u00eampera \u00e9 apresentada, portanto uma oficina que opera uma janela de austenitiza\u00e7\u00e3o diferente est\u00e1 trabalhando fora do que a ficha fornece.<\/p>\n\n\n\n

Resposta ao revenimento do A9<\/h2>\n\n\n\n

Dureza deixada por cada temperatura de revenimento<\/h3>\n\n\n\n
Revenimento, \u00b0F<\/th>\u00b0C<\/th>A9, HRC<\/th><\/tr><\/thead>
Ap\u00f3s a t\u00eampera<\/td>\u2013<\/td>64<\/td><\/tr>
300<\/td>150<\/td>61<\/td><\/tr>
400<\/td>205<\/td>60<\/td><\/tr>
500<\/td>260<\/td>60<\/td><\/tr>
600<\/td>315<\/td>58<\/td><\/tr>
800<\/td>425<\/td>56<\/td><\/tr>
900<\/td>480<\/td>54<\/td><\/tr>
1000<\/td>540<\/td>50<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico para A9, p\u00e1gina impressa 183.<\/em><\/p>\n\n\n\n

A ficha apresenta a dureza como temperado dentro do bloco de revenimento sem temperatura correspondente, portanto essa linha leva um tra\u00e7o na coluna de temperatura. A ficha n\u00e3o apresenta linha de 700 \u00b0F, portanto a linha passa de 600 \u00b0F para 800 \u00b0F com um valor Rockwell C em cada linha.<\/em><\/p>\n\n\n\n

O bloco de revenimento come\u00e7a na dureza como temperado a 64 HRC, e a linha cai a partir da\u00ed sem nenhum pico de endurecimento secund\u00e1rio em nenhum ponto. As primeiras quatro etapas mant\u00eam a linha entre 58 e 61 HRC, o que cobre de 300 \u00b0F (150 \u00b0C) a 600 \u00b0F (315 \u00b0C). Acima disso a dureza cai para 56 HRC a 800 \u00b0F (425 \u00b0C), 54 HRC a 900 \u00b0F (480 \u00b0C) e 50 HRC a 1000 \u00b0F (540 \u00b0C). A extremidade fria da linha carrega a dureza de trabalho, e as tr\u00eas \u00faltimas linhas trocam dureza por al\u00edvio de tens\u00f5es e estabilidade dimensional. A ficha apresenta um valor em cada linha e n\u00e3o diz nada sobre o n\u00famero de ciclos de revenimento, portanto trate a linha como a resposta do grau e defina os ciclos com seu tratador t\u00e9rmico antes que as pe\u00e7as entrem em servi\u00e7o.<\/p>\n\n\n\n

\n

Tratamento t\u00e9rmico do a\u00e7o ferramenta A9, PDF para impress\u00e3o<\/strong><\/p>\n\n

A composi\u00e7\u00e3o qu\u00edmica, o ciclo de t\u00eampera e a resposta ao revenimento do A9 desta p\u00e1gina em um PDF, com nossos dados de contato.<\/p>\n\n

\n
Baixar PDF, 374 KB<\/a><\/div>\n\n<\/div>\n<\/div>\n\n\n\n

Dados de refer\u00eancia relacionados<\/h2>\n\n\n\n

O A9 \u00e9 um dos graus de t\u00eampera ao ar, e a t\u00eampera ao ar como m\u00e9todo \u00e9 apresentada na p\u00e1gina de a\u00e7o ferramenta de t\u00eampera ao ar<\/a>. Os outros membros do mesmo grupo est\u00e3o na p\u00e1gina de tratamento t\u00e9rmico do a\u00e7o ferramenta A8<\/a>, a p\u00e1gina de tratamento t\u00e9rmico do a\u00e7o ferramenta A6<\/a> e o p\u00e1gina de tratamento t\u00e9rmico do a\u00e7o ferramenta A10<\/a>, e o grupo \u00e9 apresentado na p\u00e1gina de a\u00e7os ferramenta para trabalho a frio<\/a> e no P\u00e1gina do a\u00e7o ferramenta A2<\/a>. A composi\u00e7\u00e3o qu\u00edmica de cada grau est\u00e1 na Tabela de composi\u00e7\u00e3o de a\u00e7os para ferramentas<\/a>, as classifica\u00e7\u00f5es de desgaste e tenacidade na tabela de propriedades do a\u00e7o ferramenta<\/a>, as janelas de t\u00eampera e revenimento em todos os grupos na tabela de t\u00eampera e revenimento de a\u00e7o para ferramentas<\/a>, e o pr\u00f3prio processo na guia de tratamento t\u00e9rmico de a\u00e7o ferramenta<\/a>.<\/p>\n\n\n\n

Dados de refer\u00eancia compilados de Heat Treatment, Selection, and Application of Tool Steels (William E. Bryson, segunda edi\u00e7\u00e3o, Carl Hanser Verlag, 2009). A composi\u00e7\u00e3o qu\u00edmica, o ciclo de t\u00eampera e a resposta ao revenimento do A9 v\u00eam da informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico na p\u00e1gina impressa 183.<\/p>","protected":false},"excerpt":{"rendered":"

A9 Tool Steel Heat Treatment The chemistry, the hardening cycle and the tempering line the source card prints for A9 air-hardening cold work tool steel. A reference summary of published practice and not an Aobo Steel specification. A9 in the air-hardening cold work group A9 belongs to the air-hardening cold work group, and the card […]<\/p>\n","protected":false},"author":1,"featured_media":0,"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":"","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":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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Chart<\/title>\n<meta name=\"description\" content=\"Hardening temperature, air quench and the tempering response of A9 air-hardening cold work steel, with its chemistry and the hardness left on each temper row.\" \/>\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\/a9-tool-steel-heat-treatment\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A9 Tool Steel Heat Treatment\" \/>\n<meta property=\"og:description\" content=\"Hardening temperature, air quench and the tempering response of A9 air-hardening cold work steel, with its chemistry and the hardness left on each temper row.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aobosteel.com\/pt\/a9-tool-steel-heat-treatment\/\" \/>\n<meta property=\"og:site_name\" content=\"AoboSteel\" \/>\n<meta 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