{"id":24959,"date":"2026-11-04T12:23:01","date_gmt":"2026-11-04T04:23:01","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=24959"},"modified":"2026-11-04T13:17:46","modified_gmt":"2026-11-04T05:17:46","slug":"4140-steel-properties","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/4140-steel-properties\/","title":{"rendered":"A\u00e7o 4140: Propriedades, Dureza e Tratamento T\u00e9rmico"},"content":{"rendered":"<h1 id=\"h-4140-steel-properties\" class=\"wp-block-heading has-large-font-size\">A\u00e7o 4140: Propriedades, Dureza e Tratamento T\u00e9rmico<\/h1>\n\n\n\n<h2 id=\"h-what-is-4140-steel\" class=\"wp-block-heading\">O que \u00e9 o a\u00e7o 4140?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O 4140 \u00e9 um a\u00e7o liga cromo-molibd\u00eanio de m\u00e9dio carbono (AISI\/SAE 4140) e um dos a\u00e7os de engenharia mais utilizados. Aproximadamente 0,40% de carbono, 1% de cromo e 0,2% de molibd\u00eanio conferem-lhe um forte equil\u00edbrio entre resist\u00eancia, tenacidade e temperabilidade, de modo que uma \u00fanica classe cobre uma ampla faixa de n\u00edveis de resist\u00eancia por meio do tratamento t\u00e9rmico.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Internacionalmente, o mesmo a\u00e7o \u00e9 vendido como 42CrMo4 (1.7225) sob EN\/DIN, SCM440 sob JIS, 42CrMo sob GB e G41400 sob UNS. Os limites de composi\u00e7\u00e3o qu\u00edmica s\u00e3o pr\u00f3ximos, mas n\u00e3o id\u00eanticos, e as diferen\u00e7as est\u00e3o listadas na tabela de graus equivalentes abaixo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Um ponto \u00e9 importante para a sele\u00e7\u00e3o de material: o 4140 \u00e9 um a\u00e7o estrutural ligado, n\u00e3o um a\u00e7o ferramenta. Sua aplica\u00e7\u00e3o t\u00edpica s\u00e3o eixos, engrenagens, semi-eixos, parafusos, acoplamentos e pe\u00e7as de m\u00e1quinas que suportam carga e resistem \u00e0 fadiga. Ele n\u00e3o \u00e9 projetado para ferramentas de corte, estampagem ou conforma\u00e7\u00e3o, onde dominam a resist\u00eancia ao desgaste e a alta dureza de trabalho. Saber onde fica essa linha \u00e9 a diferen\u00e7a entre uma pe\u00e7a que dura e uma que falha precocemente.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/11\/AISI-4140-Reference-Card.pdf\" download>Baixar a ficha do 4140, 414 KB<\/a><\/div>\n<\/div>\n\n\n\n<h2 id=\"h-chemical-composition\" class=\"wp-block-heading\">Composi\u00e7\u00e3o Qu\u00edmica<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Elemento<\/td><td>AISI 4140 (peso %)<\/td><td>42CrMo4 \/ EN (peso %)<\/td><td>GB 42CrMo (peso %)<\/td><\/tr><tr><td>Carbon (C)<\/td><td>0.38\u20130.43<\/td><td>0.38\u20130.45<\/td><td>0.38\u20130.45<\/td><\/tr><tr><td>Mangan\u00eas (Mn)<\/td><td>0.75\u20131.00<\/td><td>0.60\u20130.90<\/td><td>0.50\u20130.80<\/td><\/tr><tr><td>Sil\u00edcio (Si)<\/td><td>0.15\u20130.35<\/td><td>0,40 m\u00e1x.<\/td><td>0.17\u20130.37<\/td><\/tr><tr><td>Cromo (Cr)<\/td><td>0.80\u20131.10<\/td><td>0.90-1.20<\/td><td>0.90-1.20<\/td><\/tr><tr><td>Molibd\u00eanio (Mo)<\/td><td>0.15\u20130.25<\/td><td>0.15\u20130.30<\/td><td>0.15\u20130.25<\/td><\/tr><tr><td>F\u00f3sforo (P)<\/td><td>0,035 m\u00e1x.<\/td><td>0,035 m\u00e1x.<\/td><td>0,035 m\u00e1x.<\/td><\/tr><tr><td>Enxofre (S)<\/td><td>0,040 m\u00e1ximo<\/td><td>0,035 m\u00e1x.<\/td><td>0,035 m\u00e1x.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O cromo e o molibd\u00eanio s\u00e3o o que separam o 4140 de um a\u00e7o carbono comum como o 1045. O cromo aumenta a temperabilidade e a resist\u00eancia ao desgaste; o molibd\u00eanio melhora ainda mais a temperabilidade, mant\u00e9m a resist\u00eancia em temperatura moderada e limita a fragiliza\u00e7\u00e3o revers\u00edvel por revenimento. Juntos, eles permitem que se\u00e7\u00f5es mais espessas endure\u00e7am de forma mais uniforme do que o a\u00e7o carbono.<\/p>\n\n\n\n<h2 id=\"h-tempering-response\" class=\"wp-block-heading\">Resposta ao Revenimento e Propriedades Mec\u00e2nicas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O 4140 raramente \u00e9 usado em uma \u00fanica condi\u00e7\u00e3o fixa. A mesma barra pode ser um eixo tenaz pr\u00f3ximo de 30 HRC ou uma superf\u00edcie dura de desgaste acima de 50 HRC, e apenas a temperatura de revenimento decide qual. A tabela abaixo \u00e9 a resposta padr\u00e3o ao revenimento para uma barra de 25 mm temperada em \u00f3leo a partir de 845\u2013870 \u00b0C.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Revenimento<\/td><td>Resist\u00eancia \u00e0 trac\u00e7\u00e3o<\/td><td>Limite de escoamento<\/td><td>Dureza HB (~HRC)<\/td><\/tr><tr><td>205 \u00b0C<\/td><td>1965 MPa<\/td><td>1740 MPa<\/td><td>578 (55)<\/td><\/tr><tr><td>260 \u00b0C<\/td><td>1860 MPa<\/td><td>1650 MPa<\/td><td>534 (53)<\/td><\/tr><tr><td>315 \u00b0C<\/td><td>1720 MPa<\/td><td>1570 MPa<\/td><td>495 (50)<\/td><\/tr><tr><td>370 \u00b0C<\/td><td>1590 MPa<\/td><td>1460 MPa<\/td><td>461 (47)<\/td><\/tr><tr><td>425 \u00b0C<\/td><td>1450 MPa<\/td><td>1340 MPa<\/td><td>429 (45)<\/td><\/tr><tr><td>480 \u00b0C<\/td><td>1300 MPa<\/td><td>1210 MPa<\/td><td>388 (41)<\/td><\/tr><tr><td>540 \u00b0C<\/td><td>1150 MPa<\/td><td>1050 MPa<\/td><td>341 (37)<\/td><\/tr><tr><td>595 \u00b0C<\/td><td>1020 MPa<\/td><td>910 MPa<\/td><td>311 (34)<\/td><\/tr><tr><td>650 \u00b0C<\/td><td>900 MPa<\/td><td>790 MPa<\/td><td>277 (30)<\/td><\/tr><tr><td>705 \u00b0C<\/td><td>810 MPa<\/td><td>690 MPa<\/td><td>235 (22)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Os valores s\u00e3o t\u00edpicos, n\u00e3o m\u00ednimos garantidos. A dureza \u00e9 apresentada em HB no material de origem; o valor em HRC entre par\u00eanteses \u00e9 uma convers\u00e3o. As propriedades certificadas devem sempre estar vinculadas a um tamanho de se\u00e7\u00e3o definido e a um local de ensaio declarado.<\/p>\n\n\n\n<h2 id=\"h-hardness-by-section\" class=\"wp-block-heading\">Dureza por Tamanho de Se\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A dureza superficial ap\u00f3s t\u00eampera em \u00f3leo diminui \u00e0 medida que a barra aumenta, porque o 4140 tem apenas temperabilidade moderada. Em se\u00e7\u00f5es finas, a t\u00eampera produz quase martensita total; acima de aproximadamente 75\u2013100 mm, o centro nunca atinge esse n\u00edvel.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Di\u00e2metro da barra<\/td><td>HRC<\/td><td>HB (aprox.)<\/td><td>Condi\u00e7\u00e3o<\/td><\/tr><tr><td>13 mm (0.5 in)<\/td><td>57<\/td><td>596<\/td><td>Ap\u00f3s a t\u00eampera<\/td><\/tr><tr><td>25 mm (1 in)<\/td><td>55<\/td><td>560<\/td><td>Ap\u00f3s a t\u00eampera<\/td><\/tr><tr><td>50 mm (2 in)<\/td><td>49<\/td><td>469<\/td><td>Ap\u00f3s a t\u00eampera<\/td><\/tr><tr><td>25 mm (1 in)<\/td><td>\u2014<\/td><td>335<\/td><td>Revenido a 540 \u00b0C<\/td><\/tr><tr><td>50 mm (2 in)<\/td><td>\u2014<\/td><td>202<\/td><td>Revenido a 540 \u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As duas \u00faltimas linhas s\u00e3o o ponto principal. Na mesma temperatura de revenimento, uma barra de 25 mm atinge 335 HB e uma barra de 50 mm atinge 202 HB. Quando uma pe\u00e7a precisa ser dura em toda a se\u00e7\u00e3o, este \u00e9 o n\u00famero que define o grau ou o processo \u2014 um revenimento mais longo n\u00e3o fecha a diferen\u00e7a.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dureza por condi\u00e7\u00e3o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Recozido:<\/strong> 197 HB. Mole, usin\u00e1vel, e a condi\u00e7\u00e3o em que o material em barra \u00e9 normalmente fornecido.<\/li>\n\n<li><strong>Normalizado:<\/strong> 241\u2013302 HB.<\/li>\n\n<li><strong>Temperado em \u00f3leo e revenido:<\/strong> 229\u2013341 HB, definida pela temperatura de revenimento e pela se\u00e7\u00e3o.<\/li>\n\n<li><strong>Fornecimento pr\u00e9-endurecido:<\/strong> no topo da faixa revenida, aproximadamente 300 HB (cerca de 30 HRC).<\/li>\n\n<li><strong>Superf\u00edcie por indu\u00e7\u00e3o, chama ou nitretada:<\/strong> a camada \u00e9 muito mais dura que o n\u00facleo; o n\u00facleo ainda define a capacidade de carga.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-equivalent-grades\" class=\"wp-block-heading\">graus equivalentes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O mesmo a\u00e7o circula sob nomes diferentes, e os limites de composi\u00e7\u00e3o qu\u00edmica n\u00e3o s\u00e3o id\u00eanticos. O mangan\u00eas \u00e9 a faixa que mais varia: 0,75\u20131,00% no AISI 4140, 0,60\u20130,85% no SCM440, 0,50\u20130,80% no GB 42CrMo.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Padr\u00e3o<\/td><td>Grau<\/td><td>Composi\u00e7\u00e3o qu\u00edmica (% em peso)<\/td><\/tr><tr><td>ASTM A29\/A29M-03<\/td><td>4140 (G41400)<\/td><td>C 0,38\u20130,43 \u00b7 Mn 0,75\u20131,00 \u00b7 Si 0,15\u20130,35 \u00b7 Cr 0,80\u20131,10 \u00b7 Mo 0,15\u20130,25 \u00b7 P 0,035 \u00b7 S 0,040<\/td><\/tr><tr><td>SAE J404 JUN00<\/td><td>4140 (G41400)<\/td><td>C 0,38\u20130,43 \u00b7 Mn 0,75\u20131,00 \u00b7 Si 0,15\u20130,35 \u00b7 Cr 0,80\u20131,10 \u00b7 Mo 0,15\u20130,25 \u00b7 P 0,030 \u00b7 S 0,040<\/td><\/tr><tr><td>JIS G4053:2003<\/td><td>SCM 440<\/td><td>C 0,38\u20130,43 \u00b7 Mn 0,60\u20130,85 \u00b7 Si 0,15\u20130,35 \u00b7 Cr 0,90\u20131,20 \u00b7 Mo 0,15\u20130,30 \u00b7 P 0,030 \u00b7 S 0,030<\/td><\/tr><tr><td>EN 10083-1:1991<\/td><td>42CrMo4 (1,7225)<\/td><td>C 0,38\u20130,45 \u00b7 Mn 0,60\u20130,90 \u00b7 Si 0,40 m\u00e1x \u00b7 Cr 0,90\u20131,20 \u00b7 Mo 0,15\u20130,30 \u00b7 P 0,035 \u00b7 S 0,035<\/td><\/tr><tr><td>EN 10083-1:1991<\/td><td>42CrMoS4 (1.7227)<\/td><td>C 0,38\u20130,45 \u00b7 Mn 0,60\u20130,90 \u00b7 Si 0,40 m\u00e1x \u00b7 Cr 0,90\u20131,20 \u00b7 Mo 0,15\u20130,30 \u00b7 S 0,020\u20130,040<\/td><\/tr><tr><td>GB (China)<\/td><td>42CrMo<\/td><td>C 0,38\u20130,45 \u00b7 Mn 0,50\u20130,80 \u00b7 Si 0,17\u20130,37 \u00b7 Cr 0,90\u20131,20 \u00b7 Mo 0,15\u20130,25<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Estes s\u00e3o graus equivalentes mais pr\u00f3ximos, n\u00e3o pe\u00e7as intercambi\u00e1veis. As faixas de mangan\u00eas e enxofre diferem, assim como a faixa de temperabilidade permitida por cada norma. Antes de substituir um pelo outro, verifique as toler\u00e2ncias de composi\u00e7\u00e3o qu\u00edmica na norma de compra e a dureza que a pe\u00e7a deve atingir no tamanho de sua se\u00e7\u00e3o \u2014 um grau que atende \u00e0 composi\u00e7\u00e3o qu\u00edmica ainda pode n\u00e3o atingir a dureza.<\/p>\n\n\n\n<h2 id=\"h-heat-treatment\" class=\"wp-block-heading\">o tratamento t\u00e9rmico<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Normalizando:<\/strong> aquecer a 845\u2013925 \u00b0C e resfriar ao ar. Isso refina o gr\u00e3o e uniformiza a estrutura antes do endurecimento ou da usinagem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recozimento:<\/strong> aquecer a 830\u2013870 \u00b0C, manter, depois resfriar no forno a cerca de 15 \u00b0C\/h at\u00e9 480 \u00b0C e resfriar ao ar. O resultado \u00e9 uma estrutura mole e usin\u00e1vel pr\u00f3xima de 197 HB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Endurecimento:<\/strong> austenitizar a 830\u2013870 \u00b0C e temperar em \u00f3leo. O \u00f3leo \u00e9 o padr\u00e3o. A t\u00eampera em \u00e1gua aumenta o risco de trincas em formas complexas e raramente \u00e9 usada; quando \u00e9, a temperatura de austenitiza\u00e7\u00e3o cai para 815\u2013845 \u00b0C. Manter por no m\u00ednimo 1 hora, ou 15\u201320 minutos por 25 mm de se\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>T\u00eampera:<\/strong> duas faixas s\u00e3o usadas. 175\u2013230 \u00b0C para resist\u00eancia m\u00e1xima, ou 385\u2013705 \u00b0C para todo o resto, at\u00e9 um limite de escoamento abaixo de 1380 MPa. A temperatura de revenimento, n\u00e3o a t\u00eampera, define as propriedades finais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dois efeitos de fragiliza\u00e7\u00e3o merecem aten\u00e7\u00e3o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fragiliza\u00e7\u00e3o por martensita revenida<\/strong> \u2014 o 4140 normalmente n\u00e3o \u00e9 revenido entre 230 e 370 \u00b0C, a faixa de fragilidade azul, porque a tenacidade ao impacto cai acentuadamente nessa faixa.<\/li>\n\n<li><strong>Fragiliza\u00e7\u00e3o por revenido revers\u00edvel<\/strong> \u2014 pode se desenvolver em se\u00e7\u00f5es espessas que resfriam lentamente atrav\u00e9s de 375\u2013575 \u00b0C ap\u00f3s revenimento a alta temperatura, e est\u00e1 ligada ao f\u00f3sforo e a impurezas semelhantes. O molibd\u00eanio no 4140 reduz a tend\u00eancia; o resfriamento mais r\u00e1pido a partir da temperatura de revenimento a limita ainda mais.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-welding-4140\" class=\"wp-block-heading\">Soldagem do 4140<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O 4140 n\u00e3o \u00e9 um a\u00e7o para soldagem pr\u00e9-qualificado. Um procedimento de soldagem deve ser escrito e qualificado para a junta, e os quatro controles abaixo n\u00e3o s\u00e3o opcionais.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pr\u00e9-aquecimento acima da temperatura de in\u00edcio da martensita: <strong>290 \u00b0C (550 \u00b0F)<\/strong>. Acima desse n\u00edvel, a zona afetada pelo calor se transforma em bainita em vez de martensita n\u00e3o revenida, que \u00e9 o que trinca.<\/li>\n\n<li>Manter o pr\u00e9-aquecimento como temperatura entre passes. Se a pe\u00e7a cair abaixo disso, pare e reaque\u00e7a.<\/li>\n\n<li>Um processo com baixo hidrog\u00eanio e consum\u00edveis com baixo hidrog\u00eanio s\u00e3o obrigat\u00f3rios. O hidrog\u00eanio \u00e9 a outra metade da fissura\u00e7\u00e3o a frio.<\/li>\n\n<li>P\u00f3s-aquecimento n\u00e3o superior a 28 \u00b0C (50 \u00b0F) abaixo da temperatura de revenimento aplicada \u00e0 pe\u00e7a. Resfriar uma ZTA n\u00e3o revenida at\u00e9 a temperatura ambiente \u00e9 como um reparo se transforma em trinca.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-machining-4140\" class=\"wp-block-heading\">Usinagem do 4140<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">No estado recozido, com 187\u2013229 HB, o 4140 \u00e9 usinado a cerca de <strong>65%<\/strong> da taxa do AISI 1212 tomada como 100%. Essa \u00e9 uma classifica\u00e7\u00e3o normal de a\u00e7o-liga, n\u00e3o uma dif\u00edcil \u2014 a condi\u00e7\u00e3o de dureza \u00e9 o que altera o n\u00famero.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recozido (187\u2013229 HB): a condi\u00e7\u00e3o mais r\u00e1pida, e na qual se deve usinar quando a pe\u00e7a passa por tratamento t\u00e9rmico depois.<\/li>\n\n<li>Temperado e revenido (229\u2013341 HB): velocidades menores, montagem mais r\u00edgida, maior desgaste da ferramenta. Usinar na condi\u00e7\u00e3o pr\u00e9-endurecida evita distor\u00e7\u00e3o e carepa de um tratamento t\u00e9rmico posterior.<\/li>\n\n<li>Pe\u00e7as t\u00edpicas cortadas do 4140: bielas, virabrequins, munh\u00f5es de dire\u00e7\u00e3o, eixos, engrenagens, prisioneiros, parafusos de alta resist\u00eancia, porta-ferramentas e hastes.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-4140-or-a-tool-steel\" class=\"wp-block-heading\">A\u00e7o 4140 ou a\u00e7o ferramenta? A escolha do a\u00e7o certo para cada aplica\u00e7\u00e3o.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O 4140 e os a\u00e7os-ferramenta se sobrep\u00f5em em algumas faixas de dureza, ent\u00e3o \u00e9 tentador substituir um pelo outro apenas pelo pre\u00e7o. A escolha correta decorre do que a pe\u00e7a precisa suportar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O 4140 \u00e9 a melhor resposta quando a pe\u00e7a suporta carga e fadiga em vez de corte ou abras\u00e3o: eixos, engrenagens, mandris, porta-ferramentas, bases e pe\u00e7as estruturais de m\u00e1quinas. \u00c9 mais tenaz e muito mais barato que o a\u00e7o-ferramenta, solda com mais facilidade e est\u00e1 dispon\u00edvel em uma faixa maior de tamanhos e formas. Quando vida ao desgaste extrema e 58+ HRC n\u00e3o s\u00e3o exigidos, pagar por a\u00e7o-ferramenta n\u00e3o traz nada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o-ferramenta \u00e9 a resposta correta quando os modos de falha s\u00e3o desgaste, reten\u00e7\u00e3o de fio ou calor. O 4140 n\u00e3o consegue manter um fio de corte nem resistir ao desgaste abrasivo de matrizes t\u00e3o bem quanto um grau de alto carboneto, e perde resist\u00eancia rapidamente acima de cerca de 400 \u00b0C. Vale a pena tra\u00e7ar claramente tr\u00eas linhas:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ferramentas de corte e estampagem<\/strong> precisam da dureza (60+ HRC) e do volume de carbonetos que o 4140 n\u00e3o tem. O D2 ou o A2 dura muito mais em uma matriz de desgaste.<\/li>\n\n<li><strong>Ferramental para trabalho a quente acima de ~400 \u00b0C<\/strong> precisa da dureza a quente do H13, que o 4140 n\u00e3o possui.<\/li>\n\n<li><strong>Qualquer pe\u00e7a que deva suportar 58+ HRC<\/strong> em uma se\u00e7\u00e3o real est\u00e1 fora do alcance do 4140, porque ele n\u00e3o consegue chegar l\u00e1 de forma confi\u00e1vel no tamanho de se\u00e7\u00e3o envolvido.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Propriedade<\/td><td>4140<\/td><td>D2<\/td><td>H13<\/td><td>A2<\/td><\/tr><tr><td>Dureza m\u00e1xima (pr\u00e1tica)<\/td><td>~50\u201355 HRC<\/td><td>58\u201362 HRC<\/td><td>44\u201352 HRC<\/td><td>57\u201362 HRC<\/td><\/tr><tr><td>Resist\u00eancia ao desgaste<\/td><td>Baixo<\/td><td>Excelente<\/td><td>Moderado<\/td><td>Bom<\/td><\/tr><tr><td>Dureza quente<\/td><td>Baixa (abaixo de 400 \u00b0C)<\/td><td>Baixo<\/td><td>Excelente (at\u00e9 ~600 \u00b0C)<\/td><td>Baixo<\/td><\/tr><tr><td>Tenacidade<\/td><td>Bom<\/td><td>Moderado<\/td><td>Bom<\/td><td>Moderado<\/td><\/tr><tr><td>Custo relativo<\/td><td>Baixo<\/td><td>Alto<\/td><td>Alto<\/td><td>M\u00e9dio-alto<\/td><\/tr><tr><td>volume de carboneto<\/td><td>Nenhum<\/td><td>Alto (carbetos de Cr)<\/td><td>Baixo (carbonetos de liga)<\/td><td>Moderado (carbetos de Cr)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 id=\"h-standards-and-references\" class=\"wp-block-heading\">Normas e Refer\u00eancias<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O 4140 e seus equivalentes s\u00e3o cobertos pela ASTM A29\/A29M e SAE J404 (composi\u00e7\u00e3o de barras), ASTM A322 (tarugos e barras), EN 10083-1 (42CrMo4), JIS G4053 (SCM440) e GB\/T 3077 (42CrMo). As propriedades mec\u00e2nicas certificadas devem sempre estar vinculadas a uma norma declarada, tamanho de se\u00e7\u00e3o e local de ensaio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dados nesta p\u00e1gina:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Propriedades mec\u00e2nicas e pr\u00e1tica de tratamento t\u00e9rmico \u2014 ASM Handbook Vol. 4, Heat Treating, se\u00e7\u00e3o 4140.<\/li>\n\n<li>Dureza por tamanho de se\u00e7\u00e3o, faixas recozida \/ normalizada \/ revenida, classifica\u00e7\u00e3o de usinabilidade \u2014 Cutting Data for Turning of Steel, cap\u00edtulo AISI 4140.<\/li>\n\n<li>Graus equivalentes e qu\u00edmica \u2014 Handbook of Comparative World Steel Standards (ASTM DS 67B), tabela de a\u00e7os Cr-Mo.<\/li>\n\n<li>Pr\u00e1tica de soldagem \u2014 ASM Handbook Vol. 6, Welding, Brazing and Soldering.<\/li>\n\n<li>Ficha de refer\u00eancia do AISI 4140, PDF de 2 p\u00e1ginas, 414 KB. O PDF est\u00e1 em ingl\u00eas. As mesmas tabelas, para impress\u00e3o.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Leitura relacionada:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/aobosteel.com\/pt\/4140-vs-h13\/\">A\u00e7o ferramenta 4140 vs H13<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/d2-steel-vs-4140\/\">A\u00e7o ferramenta 4140 vs D2<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/4140-vs-a2-tool-steel\/\">4140 vs A\u00e7o-Ferramenta A2<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/scm415-alloy-steel\/\">A\u00e7o de liga SCM415<\/a><\/li>\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/4340-steel-properties\/\">Propriedades e tratamento t\u00e9rmico do a\u00e7o 4340<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/o-que-e-aco-para-ferramentas\/\">O que \u00e9 a\u00e7o para ferramentas?<\/a><\/li>\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/how-to-select-tool-steels\/\">Guia de Sele\u00e7\u00e3o de A\u00e7os para Ferramentas<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>4140 (42CrMo4 \/ SCM440) chromium-molybdenum steel: tempering response to 705 \u00b0C, hardness by section size, equivalent grades, welding and machinability.<\/p>","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 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-24959","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - 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