{"id":19885,"date":"2026-09-27T00:11:15","date_gmt":"2026-09-26T16:11:15","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=19885"},"modified":"2026-10-16T00:04:22","modified_gmt":"2026-10-15T16:04:22","slug":"m7-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/m7-tool-steel-heat-treatment\/","title":{"rendered":"Tratamento t\u00e9rmico do a\u00e7o ferramenta M7"},"content":{"rendered":"

Tratamento t\u00e9rmico do a\u00e7o ferramenta M7<\/h1>\n\n\n\n

A composi\u00e7\u00e3o qu\u00edmica, o ciclo de t\u00eampera e a linha de revenimento que a ficha t\u00e9cnica apresenta para o a\u00e7o r\u00e1pido ao molibd\u00eanio M7. Um resumo de refer\u00eancia da pr\u00e1tica publicada e n\u00e3o uma especifica\u00e7\u00e3o da Aobo Steel.<\/p>\n\n\n\n

M7 no grupo dos a\u00e7os r\u00e1pidos<\/h2>\n\n\n\n

O M7 \u00e9 um a\u00e7o r\u00e1pido ao molibd\u00eanio com tungst\u00eanio e sem cobalto. A ficha apresenta 8,75% de molibd\u00eanio contra 1,75% de tungst\u00eanio, de modo que a resposta \u00e0 t\u00eampera depende do molibd\u00eanio, e sem teor de cobalto indicado para o grau, \u00e9 a op\u00e7\u00e3o isenta de cobalto ao lado dos graus com cobalto da mesma fam\u00edlia. Uma composi\u00e7\u00e3o isenta de cobalto como esta \u00e9 mais f\u00e1cil de retificar e de usinar do que um grau com cobalto e perde dureza nas temperaturas de corte mais elevadas, que \u00e9 a troca que a oficina faz quando a opera\u00e7\u00e3o trabalha em velocidade moderada em vez de no topo da faixa.<\/p>\n\n\n\n

O cart\u00e3o \u00e9 informa\u00e7\u00e3o de refer\u00eancia de oficina e n\u00e3o uma especifica\u00e7\u00e3o. Ele apresenta uma etapa de pr\u00e9-aquecimento, uma temperatura de t\u00eampera e um meio de resfriamento, depois uma tabela de revenimento com um \u00fanico valor de dureza em cada linha e nenhuma faixa de toler\u00e2ncia em lugar algum. Vale a pena testar uma primeira ferramenta cortada de uma nova corrida de a\u00e7o antes que o ciclo seja aplicado a uma ferramenta de produ\u00e7\u00e3o.<\/p>\n\n\n\n

Composi\u00e7\u00e3o qu\u00edmica do M7<\/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>1.00<\/td><\/tr>
Manganese<\/td>0.30<\/td><\/tr>
Silicon<\/td>0.40<\/td><\/tr>
Cromo<\/td>3.75<\/td><\/tr>
Molibd\u00eanio<\/td>8.75<\/td><\/tr>
Van\u00e1dio<\/td>2.00<\/td><\/tr>
Tungst\u00eanio<\/td>1.75<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico para M7, p\u00e1gina impressa 192.<\/em><\/p>\n\n\n\n

A ficha apresenta um valor para cada elemento em vez de uma faixa de especifica\u00e7\u00e3o. Cobalto e enxofre est\u00e3o listados na ficha sem valor indicado, portanto essas linhas s\u00e3o omitidas da tabela em vez de serem mostradas como zero.<\/em><\/p>\n\n\n\n

O molibd\u00eanio a 8,75% e o tungst\u00eanio a 1,75% sustentam a resposta \u00e0 t\u00eampera do grau. O cromo a 3,75% e o van\u00e1dio a 2,00% formam os carbonetos contra os quais o gume de corte se desgasta, e o carbono a 1,00% \u00e9 o que constitui esses carbonetos. O teor de van\u00e1dio \u00e9 alto para um grau ao molibd\u00eanio e manifesta-se como resist\u00eancia ao desgaste no gume e como custo de retifica\u00e7\u00e3o por tr\u00e1s dele. A ficha lista cobalto e enxofre sem valor indicado, 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 conforme a norma, a usina e o n\u00famero de corrida, portanto confirme os valores com o certificado de ensaio do material da corrida ou consulte a Aobo Steel.<\/p>\n\n\n\n

T\u00eampera do M7<\/h2>\n\n\n\n

Pr\u00e9-aquecimento, temperatura de t\u00eampera e resfriamento<\/h3>\n\n\n\n
Etapa<\/th>M7<\/th><\/tr><\/thead>
Pr\u00e9-aquecimento<\/td>1500 \u00b0F (815 \u00b0C)<\/td><\/tr>
Temperar<\/td>2200 \u00b0F (1205 \u00b0C)<\/td><\/tr>
Meio de t\u00eampera<\/td>T\u00eampera em \u00f3leo ou sal<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico para M7, p\u00e1gina impressa 192.<\/em><\/p>\n\n\n\n

A ficha apresenta um pr\u00e9-aquecimento, uma temperatura de t\u00eampera e um meio de resfriamento para o grau. Esta ficha n\u00e3o traz asterisco no pr\u00e9-aquecimento, ao contr\u00e1rio das fichas O1 e O6 ao lado dela, portanto 1500 \u00b0F est\u00e1 impresso para a carga conforme escrito e n\u00e3o como uma etapa condicionada ao tamanho da se\u00e7\u00e3o.<\/em><\/p>\n\n\n\n

O pr\u00e9-aquecimento de 1500 \u00b0F (815 \u00b0C) eleva a carga antes da temperatura de austenitiza\u00e7\u00e3o, e a ficha n\u00e3o apresenta nenhuma condi\u00e7\u00e3o associada, portanto a etapa vale para toda carga e n\u00e3o apenas para se\u00e7\u00f5es pesadas. A t\u00eampera ocorre a 2200 \u00b0F (1205 \u00b0C), que fica dentro da faixa de 2150 \u00b0F a 2225 \u00b0F que nosso gr\u00e1fico de t\u00eampera e revenimento fornece para os graus ao molibd\u00eanio, seguida de resfriamento em \u00f3leo ou sal. O sal \u00e9 o mais r\u00e1pido dos dois meios e o que a oficina procura em uma ferramenta com se\u00e7\u00e3o suficiente para exigi-lo, enquanto o \u00f3leo reduz a distor\u00e7\u00e3o em pe\u00e7as esbeltas. A ficha apresenta uma temperatura de t\u00eampera, portanto uma oficina que trabalhe com uma janela de austenitiza\u00e7\u00e3o diferente est\u00e1 fora do que a ficha fornece.<\/p>\n\n\n\n

Resposta ao revenimento do M7<\/h2>\n\n\n\n

Dureza deixada por cada temperatura de revenimento<\/h3>\n\n\n\n
Revenimento, \u00b0F<\/th>\u00b0C<\/th>M7, HRC<\/th><\/tr><\/thead>
Ap\u00f3s a t\u00eampera<\/td>Sem revenimento<\/td>66<\/td><\/tr>
900<\/td>480<\/td>65<\/td><\/tr>
950<\/td>510<\/td>66<\/td><\/tr>
1000<\/td>540<\/td>66<\/td><\/tr>
1050<\/td>565<\/td>65<\/td><\/tr>
1100<\/td>595<\/td>64<\/td><\/tr>
1150<\/td>620<\/td>58<\/td><\/tr>
1200<\/td>650<\/td>54<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Fonte, informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico para M7, p\u00e1gina impressa 192.<\/em><\/p>\n\n\n\n

A ficha varia as temperaturas de revenimento em incrementos de 50 \u00b0F de 900 \u00b0F a 1200 \u00b0F e apresenta um valor Rockwell C em cada linha. A primeira linha \u00e9 a dureza como temperada, antes de qualquer revenimento. Os valores mant\u00eam-se dentro de um ponto do valor como temperado at\u00e9 1050 \u00b0F e caem depois disso, e a ficha termina em 1200 \u00b0F.<\/em><\/p>\n\n\n\n

Como temperado o grau fica em 66 HRC, e a ficha o mant\u00e9m dentro de um ponto a partir da\u00ed at\u00e9 1050 \u00b0F (565 \u00b0C) antes de a linha quebrar. Os passos seguintes indicam 64 HRC a 1100 \u00b0F (595 \u00b0C), 58 HRC a 1150 \u00b0F (620 \u00b0C) e 54 HRC a 1200 \u00b0F (650 \u00b0C). Um patamar t\u00e3o plano deixa margem para escolher a temperatura de revenimento em fun\u00e7\u00e3o da tenacidade, e qualquer perda real de dureza de trabalho come\u00e7a acima de 1050 \u00b0F. A ficha apresenta um valor em cada linha e nada diz 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 de a ferramenta entrar em servi\u00e7o.<\/p>\n\n\n\n

\n

Tratamento t\u00e9rmico do a\u00e7o ferramenta M7, 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 M7 desta p\u00e1gina em um \u00fanico 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 grupo ao qual este grau pertence est\u00e1 listado no cat\u00e1logo de a\u00e7os r\u00e1pidos<\/a>, e a forma como os graus s\u00e3o escolhidos para trabalho de corte est\u00e1 descrita na p\u00e1gina de sele\u00e7\u00e3o de a\u00e7o ferramenta de corte r\u00e1pido<\/a>. As ferramentas para as quais os graus ao molibd\u00eanio s\u00e3o comprados est\u00e3o na p\u00e1gina de a\u00e7o r\u00e1pido para ferramentas de corte<\/a>, e os graus com cobalto ao lado do M7 est\u00e3o na p\u00e1gina do a\u00e7o ferramenta M35<\/a> e o p\u00e1gina do a\u00e7o ferramenta M42<\/a>. Somente as faixas de revenimento est\u00e3o na Tabela de revenimento de a\u00e7o para ferramentas<\/a>, as faixas de t\u00eampera e revenimento de todos os grupos est\u00e3o na tabela de t\u00eampera e revenimento de a\u00e7o para ferramentas<\/a>, e as faixas de composi\u00e7\u00e3o da s\u00e9rie M est\u00e3o na Tabela de composi\u00e7\u00e3o de a\u00e7os para ferramentas<\/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, Hanser). A composi\u00e7\u00e3o qu\u00edmica, o ciclo de t\u00eampera e a resposta ao revenimento do M7 v\u00eam da informa\u00e7\u00e3o de refer\u00eancia de tratamento t\u00e9rmico na p\u00e1gina impressa 192.<\/p>","protected":false},"excerpt":{"rendered":"

M7 Tool Steel Heat Treatment The chemistry, the hardening cycle and the tempering line the source card prints for molybdenum high speed steel M7. A reference summary of published practice and not an Aobo Steel specification. M7 in the high speed steel group M7 is a molybdenum high speed steel with tungsten and without cobalt. […]<\/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, oil or salt quench and the tempering response of molybdenum high speed steel M7, with its chemistry and the hardness left by each temper.\" \/>\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\/m7-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=\"M7 Tool Steel Heat Treatment\" \/>\n<meta property=\"og:description\" content=\"Hardening temperature, oil or salt quench and the tempering response of molybdenum high speed steel M7, with its chemistry and the hardness left by each temper.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aobosteel.com\/pt\/m7-tool-steel-heat-treatment\/\" \/>\n<meta property=\"og:site_name\" content=\"AoboSteel\" \/>\n<meta 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