{"id":16029,"date":"2026-06-23T12:40:22","date_gmt":"2026-06-23T04:40:22","guid":{"rendered":"https:\/\/aobosteel.com\/?p=16029"},"modified":"2026-06-23T12:40:23","modified_gmt":"2026-06-23T04:40:23","slug":"case-hardening-steel-guide","status":"publish","type":"post","link":"https:\/\/aobosteel.com\/pt\/blog\/case-hardening-steel-guide\/","title":{"rendered":"Guia de cementa\u00e7\u00e3o do a\u00e7o: processo e aplica\u00e7\u00f5es"},"content":{"rendered":"<h1 id=\"h-case-hardening-steel-process-grades-and-when-to-use-it\" class=\"wp-block-heading has-large-font-size\">A\u00e7o para cementa\u00e7\u00e3o: processo, classes e quando utiliz\u00e1-lo<\/h1>\n\n\n\n<h2 id=\"h-what-is-case-hardening\" class=\"wp-block-heading\">O que \u00e9 cementa\u00e7\u00e3o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A cementa\u00e7\u00e3o \u00e9 um conjunto de tratamentos superficiais que produzem uma camada externa dura e resistente ao desgaste (a &quot;camada endurecida&quot;) sobre um n\u00facleo tenaz e d\u00factil. O m\u00e9todo mais comum \u00e9 a cementa\u00e7\u00e3o, que difunde carbono na superf\u00edcie do a\u00e7o de baixo carbono. Os m\u00e9todos de difus\u00e3o relacionados s\u00e3o a carbonitreta\u00e7\u00e3o (carbono e nitrog\u00eanio) e a nitreta\u00e7\u00e3o (somente nitrog\u00eanio). Todos eles endurecem a superf\u00edcie alterando sua composi\u00e7\u00e3o qu\u00edmica e, em seguida, resfriando a pe\u00e7a onde o processo o exige.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A cementa\u00e7\u00e3o n\u00e3o deve ser confundida com a t\u00eampera por indu\u00e7\u00e3o ou por chama. Esses processos tamb\u00e9m endurecem uma camada superficial, mas o fazem aquecendo e resfriando localmente o a\u00e7o que j\u00e1 cont\u00e9m carbono suficiente, sem adicionar nenhum novo elemento. Este guia aborda os processos de cementa\u00e7\u00e3o por difus\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uma pe\u00e7a cementada \u00e9 projetada para oferecer duas propriedades simultaneamente:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uma superf\u00edcie dura e resistente ao desgaste, tipicamente com dureza entre 58 e 64 HRC.<\/li>\n\n\n\n<li>Um n\u00facleo resistente e \u00e0 prova de choque, normalmente com dureza Rockwell C (30 a 45 HRC).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Um a\u00e7o temperado em toda a sua extens\u00e3o a 60 HRC seria demasiado quebradi\u00e7o para uma pe\u00e7a sujeita a impactos, enquanto um n\u00facleo com dureza de 35 HRC sofreria desgaste r\u00e1pido se exposto na superf\u00edcie. A cementa\u00e7\u00e3o separa os dois requisitos em duas zonas da mesma pe\u00e7a.<\/p>\n\n\n\n<h2 id=\"h-how-case-hardening-works\" class=\"wp-block-heading\">Como funciona o endurecimento superficial<\/h2>\n\n\n\n<h3 id=\"h-carburizing-most-common\" class=\"wp-block-heading\">Cementa\u00e7\u00e3o (mais comum)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A cementa\u00e7\u00e3o adiciona carbono \u00e0 superf\u00edcie do a\u00e7o de baixo carbono (tipicamente de 0,10 a 0,25% de carbono), o que n\u00e3o \u00e9 suficiente para endurec\u00ea-lo por si s\u00f3.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Difus\u00e3o de carbono: a pe\u00e7a \u00e9 mantida a 900-950\u00b0C em uma atmosfera rica em carbono (g\u00e1s, sal l\u00edquido ou composto s\u00f3lido). O carbono se dissolve na austenita na superf\u00edcie e difunde-se para o interior.<\/li>\n\n\n\n<li>Profundidade da camada cementada: a profundidade efetiva t\u00edpica da camada cementada \u00e9 de 0,5 a 2,0 mm. O crescimento segue a raiz quadrada do tempo, em vez de uma taxa constante, portanto, uma camada cementada mais profunda leva um tempo desproporcionalmente maior. Aproximadamente dobrar a profundidade da camada cementada requer cerca de quatro vezes o tempo de cementa\u00e7\u00e3o a uma determinada temperatura.<\/li>\n\n\n\n<li>T\u00eampera: a pe\u00e7a \u00e9 temperada em \u00f3leo ou \u00e1gua. A superf\u00edcie rica em carbono transforma-se em martensita dura com dureza entre 60 e 64 HRC, enquanto o n\u00facleo com baixo teor de carbono permanece mais macio e resistente.<\/li>\n\n\n\n<li>Revenimento: um revenimento a baixa temperatura, entre 150 e 200 \u00b0C, alivia a tens\u00e3o com pouca perda de dureza superficial.<\/li>\n<\/ol>\n\n\n\n<h3 id=\"h-carbonitriding\" class=\"wp-block-heading\">Carbonitreta\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A carbonitreta\u00e7\u00e3o \u00e9 essencialmente um processo de cementa\u00e7\u00e3o com adi\u00e7\u00e3o de nitrog\u00eanio \u00e0 atmosfera. O nitrog\u00eanio aumenta a temperabilidade da camada endurecida e reduz a temperatura de t\u00eampera, permitindo que a pe\u00e7a opere a temperaturas entre 800 e 870 \u00b0C e seja resfriada em \u00f3leo. A profundidade da camada endurecida \u00e9 menor do que na cementa\u00e7\u00e3o, geralmente de 0,1 a 0,5 mm, e o ciclo \u00e9 mais r\u00e1pido. \u00c9 um processo adequado para pe\u00e7as menores e componentes sujeitos a desgaste em grande volume.<\/p>\n\n\n\n<h3 id=\"h-nitriding\" class=\"wp-block-heading\">Nitreta\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A nitreta\u00e7\u00e3o difunde nitrog\u00eanio na superf\u00edcie a baixa temperatura, em torno de 500 a 550 \u00b0C, em g\u00e1s am\u00f4nia ou em um banho de sal. N\u00e3o \u00e9 necess\u00e1rio resfriamento r\u00e1pido, pois a dureza prov\u00e9m dos nitretos duros que se formam no local. A camada superficial \u00e9 fina, com aproximadamente 0,1 a 0,5 mm de espessura, mas extremamente dura, em torno de 700 a 1100 HV, e a distor\u00e7\u00e3o \u00e9 m\u00ednima, pois n\u00e3o h\u00e1 resfriamento r\u00e1pido nem mudan\u00e7a de fase no n\u00facleo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A nitreta\u00e7\u00e3o n\u00e3o \u00e9 utilizada em a\u00e7os cementados comuns de baixo carbono. Ela requer a\u00e7os que contenham elementos formadores de nitretos, como cromo, molibd\u00eanio, alum\u00ednio ou van\u00e1dio. Na pr\u00e1tica, isso significa a\u00e7os-liga de m\u00e9dio carbono (por exemplo, a\u00e7os de a\u00e7o-liga ..., <a href=\"https:\/\/aobosteel.com\/pt\/blog\/4140-steel-properties\/\">4140<\/a> e a\u00e7os espec\u00edficos para nitreta\u00e7\u00e3o) e muitos a\u00e7os para ferramentas. <a href=\"https:\/\/aobosteel.com\/pt\/h13-tool-steel\/\">H13<\/a>, Por exemplo, o a\u00e7o \u00e9 rotineiramente nitretado para melhorar a resist\u00eancia ao desgaste e \u00e0 eros\u00e3o da superf\u00edcie em ferramentas de fundi\u00e7\u00e3o e extrus\u00e3o.<\/p>\n\n\n\n<h2 id=\"h-steels-suitable-for-case-hardening\" class=\"wp-block-heading\">A\u00e7os adequados para cementa\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Os processos de cementa\u00e7\u00e3o e carbonitreta\u00e7\u00e3o exigem um a\u00e7o base com baixo teor de carbono. A adi\u00e7\u00e3o de elementos de liga nas classes superiores aumenta a resist\u00eancia do n\u00facleo e a capacidade de endurecimento superficial em se\u00e7\u00f5es mais espessas.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Grau (AISI\/GB)<\/th><th>Carbono<\/th><th>Liga chave<\/th><th>Uso t\u00edpico<\/th><\/tr><\/thead><tbody><tr><td>1018<\/td><td>~0.18%<\/td><td>Mn<\/td><td>Pe\u00e7as de desgaste de baixa tens\u00e3o, custo mais baixo<\/td><\/tr><tr><td>1020<\/td><td>~0.20%<\/td><td>Mn<\/td><td>Prop\u00f3sito geral<\/td><\/tr><tr><td>8620<\/td><td>~0.20%<\/td><td>Ni-Cr-Mo<\/td><td>Engrenagens, eixos, pinos, eixos de comando<\/td><\/tr><tr><td>4320<\/td><td>~0.20%<\/td><td>Ni-Cr-Mo<\/td><td>Engrenagens refor\u00e7adas<\/td><\/tr><tr><td>9310<\/td><td>~0.10%<\/td><td>Ni-Cr-Mo<\/td><td>Engrenagens de aeronaves, alta confiabilidade<\/td><\/tr><tr><td>20CrMnTi<\/td><td>~0.20%<\/td><td>Cr-Mn-Ti<\/td><td>Engrenagens de transmiss\u00e3o automotiva (comuns na China)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A liga 8620 \u00e9 a mais utilizada para cementa\u00e7\u00e3o, equilibrando a tenacidade do n\u00facleo com uma temperabilidade moderada. A liga 20CrMnTi adiciona tit\u00e2nio para refinamento de gr\u00e3os e domina a produ\u00e7\u00e3o de engrenagens automotivas na China. As ligas de carbono simples 1018 e 1020 s\u00e3o as op\u00e7\u00f5es mais baratas, mas oferecem resist\u00eancia do n\u00facleo e temperabilidade limitadas, sendo, portanto, mais adequadas para aplica\u00e7\u00f5es de menor exig\u00eancia.<\/p>\n\n\n\n<h2 id=\"h-case-hardening-vs-through-hardening\" class=\"wp-block-heading\">Endurecimento superficial versus t\u00eampera total<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Aspecto<\/th><th>Endurecimento superficial<\/th><th>Por meio do endurecimento<\/th><\/tr><\/thead><tbody><tr><td>A\u00e7o carbono base<\/td><td>0,10 a 0,25%<\/td><td>~0,30% e acima<\/td><\/tr><tr><td>dureza superficial<\/td><td>58 a 64 HRC<\/td><td>58 a 64 HRC (a\u00e7o ferramenta)<\/td><\/tr><tr><td>Dureza do n\u00facleo<\/td><td>25 a 45 HRC<\/td><td>Igual \u00e0 superf\u00edcie<\/td><\/tr><tr><td>resist\u00eancia central<\/td><td>Alto<\/td><td>Baixa dureza em alta dureza<\/td><\/tr><tr><td>Resist\u00eancia ao desgaste<\/td><td>Somente superf\u00edcie<\/td><td>Se\u00e7\u00e3o transversal completa<\/td><\/tr><tr><td>Ap\u00f3s o desgaste<\/td><td>N\u00facleo fr\u00e1gil exposto, falha rapidamente<\/td><td>Usa uniformemente<\/td><\/tr><tr><td>Resist\u00eancia \u00e0 fadiga<\/td><td>Excelente, devido \u00e0 tens\u00e3o superficial compressiva.<\/td><td>Bom<\/td><\/tr><tr><td>Mudan\u00e7a dimensional<\/td><td>Alguns, devido ao resfriamento brusco<\/td><td>Varia, os graus de endurecimento ao ar distorcem menos<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A tens\u00e3o residual de compress\u00e3o deixada em uma camada cementada \u00e9 uma vantagem real para pe\u00e7as submetidas a contato de flex\u00e3o ou rolamento, pois suprime o in\u00edcio de trincas de fadiga na superf\u00edcie.<\/p>\n\n\n\n<h2 id=\"h-choosing-between-case-hardening-and-tool-steel\" class=\"wp-block-heading\">Escolhendo entre cementa\u00e7\u00e3o e a\u00e7o ferramenta<\/h2>\n\n\n\n<h3 id=\"h-case-hardening-is-the-right-choice-when\" class=\"wp-block-heading\">O endurecimento superficial \u00e9 a escolha certa quando<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Componentes que necessitam de um n\u00facleo resistente para suportar impactos ou flex\u00f5es incluem engrenagens, eixos e \u00e1rvores de cames.<\/li>\n\n\n\n<li>O desgaste fica restrito \u00e0 superf\u00edcie, e a pe\u00e7a pode tolerar uma profundidade limitada de desgaste.<\/li>\n\n\n\n<li>O formato \u00e9 complexo, pois a cementa\u00e7\u00e3o segue superf\u00edcies contornadas e proporciona uma camada uniforme.<\/li>\n\n\n\n<li>A resist\u00eancia \u00e0 fadiga por flex\u00e3o ou contato \u00e9 crucial, sendo que a tens\u00e3o superficial compressiva proporciona um benef\u00edcio direto.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-through-hardened-tool-steel-is-the-right-choice-when\" class=\"wp-block-heading\">O a\u00e7o ferramenta temperado em toda a sua extens\u00e3o \u00e9 a escolha certa quando<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A pe\u00e7a \u00e9 uma ferramenta de corte que ser\u00e1 afiada novamente, portanto a aresta deve ter propriedades consistentes em toda a sua profundidade.<\/li>\n\n\n\n<li>O desgaste pode penetrar al\u00e9m de uma camada superficial fina, como em processos de estampagem, cisalhamento e extrus\u00e3o de grande porte.<\/li>\n\n\n\n<li>\u00c9 necess\u00e1ria uma elevada dureza a quente, por exemplo, H13 na fundi\u00e7\u00e3o sob press\u00e3o.<\/li>\n\n\n\n<li>Toda a se\u00e7\u00e3o transversal deve resistir \u00e0 deforma\u00e7\u00e3o pl\u00e1stica, como em pun\u00e7\u00f5es e matrizes de conforma\u00e7\u00e3o.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-why-case-hardening-cannot-replace-tool-steel-in-dies-and-cutting-tools\" class=\"wp-block-heading\">Por que a cementa\u00e7\u00e3o n\u00e3o pode substituir o a\u00e7o ferramenta em matrizes e ferramentas de corte?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A camada endurecida \u00e9 rasa, tipicamente de 0,5 a 2 mm. Uma vez que se desgasta, o n\u00facleo macio fica exposto e a pe\u00e7a falha rapidamente. As matrizes tamb\u00e9m s\u00e3o retificadas diversas vezes ao longo de sua vida \u00fatil, e cada retifica\u00e7\u00e3o remove material endurecido, de modo que uma matriz cementada eventualmente exporia seu n\u00facleo macio. Al\u00e9m disso, a resist\u00eancia ao desgaste de uma camada cementada prov\u00e9m exclusivamente da martensita rica em carbono, enquanto um a\u00e7o como o D2 possui uma alta fra\u00e7\u00e3o volum\u00e9trica de carbonetos de cromo duros, aproximadamente de 12 a 18% em volume, que resistem \u00e0 abras\u00e3o muito melhor. Para uma aresta de corte, a reten\u00e7\u00e3o de fio do a\u00e7o ferramenta temperado em toda a sua extens\u00e3o \u00e9 de uma classe superior.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A cementa\u00e7\u00e3o \u00e9 excelente para engrenagens, eixos e rolamentos. No entanto, \u00e9 a escolha errada para matrizes de estampagem, pun\u00e7\u00f5es, ferramentas de conforma\u00e7\u00e3o e ferramentas de corte, que exigem a\u00e7o ferramenta temperado em toda a sua extens\u00e3o.<\/p>\n\n\n\n<h2 id=\"h-quality-control-for-case-hardened-parts\" class=\"wp-block-heading\">Controle de Qualidade para Pe\u00e7as Cementadas<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Profundidade da camada endurecida: medida por um ensaio de dureza da superf\u00edcie at\u00e9 o n\u00facleo, ou por exame microsc\u00f3pico, em rela\u00e7\u00e3o \u00e0 profundidade efetiva especificada da camada endurecida.<\/li>\n\n\n\n<li>Dureza superficial: Rockwell C ou Vickers sob carga especificada.<\/li>\n\n\n\n<li>Dureza do n\u00facleo: geralmente medida no raio m\u00e9dio ou no centro.<\/li>\n\n\n\n<li>Microestrutura: martensita fina na camada superficial, aus\u00eancia de carbonetos cont\u00ednuos nos contornos de gr\u00e3o e austenita retida controlada.<\/li>\n\n\n\n<li>Distor\u00e7\u00e3o: verifica\u00e7\u00e3o dimensional ap\u00f3s tratamento t\u00e9rmico.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-related-pages\" class=\"wp-block-heading\">P\u00e1ginas relacionadas<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/aobosteel.com\/pt\/o-que-e-aco-para-ferramentas\/\">O que \u00e9 a\u00e7o ferramenta?<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/tool-steel-heat-treatment-guide\/\">Guia de Tratamento T\u00e9rmico de A\u00e7o Ferramenta<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/s7-tool-steel\/\">A\u00e7o ferramenta S7 resistente a choques<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/pt\/h13-tool-steel\/\">A\u00e7o para ferramentas H13<\/a><\/li>\n\n\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>Case Hardening Steel: Process, Grades, and When to Use It What Is Case Hardening? Case hardening is a group of surface treatments that produce a hard, wear-resistant outer layer (the &#8220;case&#8221;) over a tough, ductile core. The most common method is carburizing, which diffuses carbon into the surface of low-carbon steel. The related diffusion methods [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16030,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":""},"categories":[22],"tags":[],"class_list":["post-16029","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - 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