{"id":16434,"date":"2026-07-01T12:56:43","date_gmt":"2026-07-01T04:56:43","guid":{"rendered":"https:\/\/aobosteel.com\/?p=16434"},"modified":"2026-07-01T12:56:44","modified_gmt":"2026-07-01T04:56:44","slug":"plastic-injection-mold-steel-selection","status":"publish","type":"post","link":"https:\/\/aobosteel.com\/pt\/blog\/plastic-injection-mold-steel-selection\/","title":{"rendered":"Sele\u00e7\u00e3o de a\u00e7o para moldes pl\u00e1sticos | Fornecedor de a\u00e7o para ferramentas Aobo Steel"},"content":{"rendered":"<h1 id=\"h-how-to-select-steel-for-plastic-injection-molds\" class=\"wp-block-heading\">Como selecionar o a\u00e7o para moldes de inje\u00e7\u00e3o de pl\u00e1stico<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o utilizado em um molde de inje\u00e7\u00e3o de pl\u00e1stico determina o desempenho do molde, o custo de manuten\u00e7\u00e3o, a qualidade de cada pe\u00e7a produzida e sua vida \u00fatil. Um a\u00e7o de grau adequado mant\u00e9m a toler\u00e2ncia sob press\u00e3o, resiste ao desgaste e \u00e0 corros\u00e3o durante o processo de moldagem e controla o tempo de polimento e usinagem. Um a\u00e7o de grau inadequado pode causar problemas posteriores, como marcas de afundamento, cavidades trincadas, canais de refrigera\u00e7\u00e3o enferrujados ou um molde que se desgasta muito antes do t\u00e9rmino da produ\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os aspectos econ\u00f4micos refor\u00e7am essa ideia. O a\u00e7o ferramenta bruto normalmente representa apenas 10 a 20% do custo total de um molde acabado, com os 80% restantes destinados \u00e0 usinagem, polimento e montagem. Optar por um a\u00e7o mais barato para economizar em mat\u00e9ria-prima raramente compensa, pois a economia \u00e9 pequena em compara\u00e7\u00e3o com a m\u00e3o de obra j\u00e1 investida no molde e o custo da inatividade caso o molde apresente falhas prematuras. O a\u00e7o precisa ser adequado \u00e0 finalidade, o que significa que suas propriedades devem ser compat\u00edveis com o pl\u00e1stico, o volume de produ\u00e7\u00e3o e o acabamento superficial exigido pela pe\u00e7a.<\/p>\n\n\n\n<h2 id=\"h-what-a-mold-steel-has-to-do\" class=\"wp-block-heading\">O que um a\u00e7o para moldes precisa fazer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de comparar as classes de a\u00e7o, \u00e9 importante entender claramente as exig\u00eancias que um a\u00e7o para moldes deve atender, pois cada requisito est\u00e1 relacionado a uma falha espec\u00edfica que o uso de um material inadequado causaria.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A usinabilidade \u00e9 importante porque a maior parte do custo de um molde vem do corte e da fura\u00e7\u00e3o de cavidades complexas. Um a\u00e7o que seja f\u00e1cil de usinar reduz esse trabalho e diminui o custo de fabrica\u00e7\u00e3o, o que explica, em parte, a ampla utiliza\u00e7\u00e3o de a\u00e7os pr\u00e9-endurecidos fornecidos prontos para corte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A capacidade de polimento determina se o molde pode produzir pe\u00e7as transparentes ou com alto brilho. Lentes, componentes \u00f3pticos e superf\u00edcies cosm\u00e9ticas exigem um acabamento espelhado, e esse acabamento requer a\u00e7o com estrutura uniforme, alta dureza superficial e alto grau de limpeza. Inclus\u00f5es n\u00e3o met\u00e1licas aparecem como poros e estrias que nenhum polimento consegue remover; portanto, os a\u00e7os de qualidade para moldes destinados a essas aplica\u00e7\u00f5es s\u00e3o refinados para manter os n\u00edveis de inclus\u00e3o baixos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A resist\u00eancia ao desgaste e \u00e0 abras\u00e3o torna-se crucial quando o pr\u00f3prio pl\u00e1stico \u00e9 abrasivo. Fibras de vidro, cargas minerais e outros refor\u00e7os desgastam o caminho do fluxo e o ponto de inje\u00e7\u00e3o, e o a\u00e7o macio sofre eros\u00e3o primeiro nessas \u00e1reas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A resist\u00eancia \u00e0 corros\u00e3o \u00e9 essencial para pl\u00e1sticos que se decomp\u00f5em durante a moldagem. O PVC e o ABS retardante de chamas liberam cloreto de hidrog\u00eanio e fluoreto de hidrog\u00eanio \u00e0 medida que se decomp\u00f5em, e esses gases atacam o a\u00e7o comum, corroendo a cavidade e danificando os canais de refrigera\u00e7\u00e3o. Os moldes para esses pl\u00e1sticos precisam ser de um material resistente \u00e0 corros\u00e3o, caso contr\u00e1rio, degradam-se internamente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A tenacidade e a resist\u00eancia do n\u00facleo mant\u00eam o molde intacto sob press\u00e3o de fechamento e ciclos t\u00e9rmicos. Altas cargas de compress\u00e3o podem fazer com que uma cavidade subdimensionada afunde, e o aquecimento e resfriamento repetidos de cada ciclo induzem fadiga t\u00e9rmica que trinca o a\u00e7o fr\u00e1gil. O material precisa de resist\u00eancia suficiente no n\u00facleo para manter sua forma e tenacidade suficiente para suportar os ciclos sem falhar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A estabilidade dimensional favorece a\u00e7os que necessitam de pouco ou nenhum acabamento ap\u00f3s o tratamento t\u00e9rmico. Qualquer a\u00e7o que precise ser endurecido ap\u00f3s a usinagem corre o risco de distor\u00e7\u00e3o; portanto, os a\u00e7os pr\u00e9-endurecidos, que atingem a dureza de trabalho e entram em servi\u00e7o imediatamente, evitam completamente esse risco.<\/p>\n\n\n\n<h2 id=\"h-the-main-families-of-mold-steel\" class=\"wp-block-heading\">Principais fam\u00edlias de a\u00e7o para moldes<\/h2>\n\n\n\n<h3 id=\"h-prehardened-medium-carbon-steels-the-p20-family\" class=\"wp-block-heading\">A\u00e7os pr\u00e9-endurecidos de m\u00e9dio carbono: a fam\u00edlia P20<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Para moldes de uso geral, a fam\u00edlia P20 abrange a grande maioria dos materiais utilizados na ind\u00fastria. O P20 e seus equivalentes europeus DIN 1.2738, 1.2311 e 1.2312 s\u00e3o fornecidos pr\u00e9-endurecidos com dureza aproximada de 30-36 HRC e dureza de cerca de 300 HB. Essa condi\u00e7\u00e3o de pr\u00e9-endurecimento \u00e9 o principal objetivo. O a\u00e7o pode ser usinado e colocado em servi\u00e7o diretamente, sem a necessidade de um processo de t\u00eampera em alta temperatura, o que elimina a distor\u00e7\u00e3o que o tratamento t\u00e9rmico introduziria na cavidade acabada. O P20 \u00e9 adequado para moldes de grande porte usinados, pe\u00e7as automotivas como pain\u00e9is e para-choques, e bens de consumo em geral. Quando o desgaste superficial se torna um problema posteriormente, o molde pode ser cementado, temperado por chama ou nitretado para adicionar uma camada mais dura. O P21, um a\u00e7o de endurecimento por precipita\u00e7\u00e3o com suporte de alum\u00ednio, tamb\u00e9m fornecido pr\u00e9-endurecido com dureza de 32 a 36 HRC, \u00e9 a escolha ideal quando a capacidade de polimento e os acabamentos cr\u00edticos s\u00e3o mais importantes do que qualquer outro material desta classe.<\/p>\n\n\n\n<h3 id=\"h-low-carbon-hubbing-steels-p2-p4-p6\" class=\"wp-block-heading\">A\u00e7os de baixo carbono para cubos: P2, P4, P6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Um grupo menor de classes, P2, P4 e P6, possui um teor de carbono muito baixo, entre 0,05 e 0,15%, e \u00e9 fornecido em estado macio e recozido. O baixo teor de carbono permite que a cavidade seja formada por cunhagem a frio, prensando um cubo mestre endurecido no tarugo macio em vez de usinar a cavidade. Uma vez formada a cavidade, o molde \u00e9 cementado para uma camada dura de 58-61 HRC sobre um n\u00facleo resistente e com alta resist\u00eancia a impactos. Dentre essas classes, a P4 oferece a maior temperabilidade e resist\u00eancia ao desgaste, tornando-a ideal para moldes de inje\u00e7\u00e3o e compress\u00e3o de alta press\u00e3o, onde o desgaste superficial \u00e9 a principal preocupa\u00e7\u00e3o.<\/p>\n\n\n\n<h3 id=\"h-stainless-and-corrosion-resistant-steels\" class=\"wp-block-heading\">A\u00e7os inoxid\u00e1veis e resistentes \u00e0 corros\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Quando o pl\u00e1stico \u00e9 corrosivo ou o ambiente da oficina deixa os canais de refrigera\u00e7\u00e3o propensos \u00e0 ferrugem, os a\u00e7os inoxid\u00e1veis martens\u00edticos s\u00e3o a solu\u00e7\u00e3o. <a href=\"https:\/\/aobosteel.com\/pt\/420-stainless-steel\/\">AISI 420<\/a>, O a\u00e7o inoxid\u00e1vel DIN 1.2083 \u00e9 o mais comum. Seu teor de cromo de aproximadamente 13% proporciona uma forte combina\u00e7\u00e3o de resist\u00eancia \u00e0 corros\u00e3o, resist\u00eancia \u00e0 abras\u00e3o e capacidade de polimento espelhado, sendo tipicamente endurecido a uma dureza de 46 a 52 HRC. Quando a distor\u00e7\u00e3o por tratamento t\u00e9rmico \u00e9 uma preocupa\u00e7\u00e3o, os a\u00e7os inoxid\u00e1veis pr\u00e9-endurecidos, como o DIN 1.2316 e o tipo 414, oferecem resist\u00eancia \u00e0 ferrugem sem a necessidade de endurecimento, raz\u00e3o pela qual s\u00e3o comuns em moldagem de PVC e em aplica\u00e7\u00f5es m\u00e9dicas e \u00f3pticas.<\/p>\n\n\n\n<h3 id=\"h-hot-work-and-high-hardness-tool-steels-h13-s7\" class=\"wp-block-heading\">A\u00e7os para ferramentas de alta dureza e para trabalho a quente: H13, S7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Para produ\u00e7\u00e3o em larga escala ou moldes que exigem alta tenacidade e resist\u00eancia ao calor, os a\u00e7os-ferramenta para trabalho a quente s\u00e3o usados na moldagem de pl\u00e1sticos em vez da fundi\u00e7\u00e3o sob press\u00e3o. O H13 \u00e9 altamente ligado, tenaz e resistente no n\u00facleo. Ele sofre tratamento t\u00e9rmico para atingir dureza de 48 a 54 HRC e nitreta excepcionalmente bem, alcan\u00e7ando uma dureza superficial de 65 a 70 HRC que resiste ao desgaste abrasivo severo. <a href=\"https:\/\/aobosteel.com\/pt\/s7-tool-steel\/\">S7<\/a> \u00c9 a dureza ideal quando a resist\u00eancia a impactos e a resist\u00eancia mec\u00e2nica s\u00e3o prioridades. Atinge cerca de 58 HRC e permite um polimento suficientemente bom para pl\u00e1sticos transparentes.<\/p>\n\n\n\n<h3 id=\"h-wear-resistant-and-powder-metallurgy-steels-a2-d2-p-m-grades\" class=\"wp-block-heading\">A\u00e7os resistentes ao desgaste e a\u00e7os para metalurgia do p\u00f3: graus A2, D2 e P\/M<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Quando o pl\u00e1stico \u00e9 preenchido com uma grande quantidade de material abrasivo, como fibra de vidro ou p\u00f3 cer\u00e2mico, os a\u00e7os para moldes padr\u00e3o sofrem eros\u00e3o muito rapidamente para serem economicamente vi\u00e1veis. Os a\u00e7os para trabalho a frio com alto teor de carbono e cromo <a href=\"https:\/\/aobosteel.com\/pt\/a2-tool-steel\/\">A2<\/a> e <a href=\"https:\/\/aobosteel.com\/pt\/d2-tool-steel\/\">D2<\/a> Oferecem extrema resist\u00eancia \u00e0 abras\u00e3o e s\u00e3o comumente usados para pequenos insertos, pontos de desgaste e cavidades que operam com compostos abrasivos. Os a\u00e7os produzidos por metalurgia do p\u00f3 v\u00e3o al\u00e9m. Elmax, ASP-23 e CPM 440V possuem uma estrutura de carboneto ultrafina e uniformemente distribu\u00edda que combina alta resist\u00eancia ao desgaste com tenacidade, algo que a fus\u00e3o convencional n\u00e3o consegue igualar. O Elmax, um a\u00e7o inoxid\u00e1vel produzido por metalurgia do p\u00f3, adiciona resist\u00eancia \u00e0 corros\u00e3o e excelente polibilidade, al\u00e9m de sua resist\u00eancia ao desgaste, o que o torna ideal para moldes eletr\u00f4nicos e de circuitos integrados sujeitos a alto desgaste.<\/p>\n\n\n\n<h2 id=\"h-matching-the-grade-to-the-job\" class=\"wp-block-heading\">Adequar o n\u00edvel hier\u00e1rquico ao cargo<\/h2>\n\n\n\n<h3 id=\"h-by-production-volume\" class=\"wp-block-heading\">Por volume de produ\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O volume de produ\u00e7\u00e3o define a base. Moldes constru\u00eddos para alt\u00edssima produ\u00e7\u00e3o, da classe SPI 101, acima de um milh\u00e3o de ciclos, necessitam de a\u00e7os carbono e ferramentas de alta dureza, com H13, a\u00e7o inoxid\u00e1vel 420 ou A2 e D2 nas \u00e1reas de desgaste. Moldes de m\u00e9dio a alto volume, classes 102 e 103, s\u00e3o onde se utilizam a\u00e7os pr\u00e9-endurecidos P20 e <a href=\"https:\/\/aobosteel.com\/pt\/p20ni-steel\/\">DIN 1.2738<\/a> Conquistam seu lugar por combinarem vida \u00fatil adequada com baixo custo e aus\u00eancia de risco de tratamento t\u00e9rmico. Para prot\u00f3tipos e pequenas tiragens de alguns milhares de pe\u00e7as com baixa press\u00e3o de moldagem, ligas de alum\u00ednio de alta resist\u00eancia, como o 7075-T6 e o Alcoa QC-10, ou mesmo ferramentas de pol\u00edmero impressas em 3D, s\u00e3o muito mais econ\u00f4micas e conduzem melhor o calor do que o a\u00e7o.<\/p>\n\n\n\n<h3 id=\"h-by-plastic-material\" class=\"wp-block-heading\">Feito de material pl\u00e1stico<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O tipo de pl\u00e1stico a ser moldado restringe ainda mais as op\u00e7\u00f5es. Termopl\u00e1sticos padr\u00e3o, como polietileno, polipropileno e ABS, apresentam bom desempenho em a\u00e7os P20 e similares com teor m\u00e9dio de carbono. Pl\u00e1sticos corrosivos, incluindo PVC, fluoropl\u00e1sticos e ABS retardante de chamas, exigem a\u00e7os inoxid\u00e1veis como 420, 414, DIN 1.2083 e DIN 1.2316 para resistir aos gases \u00e1cidos que liberam; caso contr\u00e1rio, a cavidade apresentar\u00e1 corros\u00e3o e corros\u00e3o \u00e1spera. Pl\u00e1sticos abrasivos e refor\u00e7ados, como POM com fibra de vidro e policarbonato, requerem a\u00e7os ferramenta de alta dureza, como D2 e A2, H13 nitretado ou a\u00e7os produzidos por metalurgia do p\u00f3.<\/p>\n\n\n\n<h3 id=\"h-by-surface-finish\" class=\"wp-block-heading\">Por acabamento de superf\u00edcie<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O acabamento exigido pela pe\u00e7a pode sobrepor-se a outros fatores. Um acabamento de alto brilho ou espelhado para lentes, pe\u00e7as \u00f3pticas e acr\u00edlicos transparentes depende de a\u00e7o isento de inclus\u00f5es, o que significa graus de qualidade de molde refinados por <a href=\"https:\/\/aobosteel.com\/pt\/knowledge-hub\/what-is-electroslag-remelting-esr\/\">refus\u00e3o por eletroesc\u00f3ria<\/a> ou refus\u00e3o por arco a v\u00e1cuo. Os a\u00e7os inoxid\u00e1veis P21 e 420, bem como os a\u00e7os especiais de endurecimento por precipita\u00e7\u00e3o ou maraging, proporcionam os melhores resultados nesse processo. Superf\u00edcies texturizadas e gravadas apresentam sensibilidade oposta. A fotograva\u00e7\u00e3o qu\u00edmica exige uma estrutura altamente homog\u00eanea para que o \u00e1cido penetre uniformemente, e a\u00e7os com alta segrega\u00e7\u00e3o ou a\u00e7os de usinagem livre com alto teor de enxofre, como o DIN 1.2312, devem ser evitados quando a uniformidade da textura for importante, pois suas varia\u00e7\u00f5es internas se manifestam como uma grava\u00e7\u00e3o irregular.<\/p>\n\n\n\n<h2 id=\"h-working-through-the-decision\" class=\"wp-block-heading\">Analisando a decis\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o existe um tipo de pl\u00e1stico ideal para todos os moldes. A escolha certa surge ao responder \u00e0s mesmas tr\u00eas perguntas, nesta ordem: quantas pe\u00e7as o molde precisa produzir, qual tipo de pl\u00e1stico ser\u00e1 utilizado e qual o acabamento necess\u00e1rio para a pe\u00e7a. Respondendo a essas perguntas, as op\u00e7\u00f5es geralmente se reduzem a dois ou tr\u00eas tipos de pl\u00e1stico, e a partir da\u00ed, a usinabilidade, a disponibilidade e o custo definem o restante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A maioria dos a\u00e7os desta categoria est\u00e1 em estoque na Aobo Steel. <a href=\"https:\/\/aobosteel.com\/pt\/plastic-mold-steels\/\">gama de a\u00e7o para moldes de pl\u00e1stico<\/a> A gama de a\u00e7os inoxid\u00e1veis pr\u00e9-endurecidos varia dos P20 e 420 para moldes de uso geral e resistentes \u00e0 corros\u00e3o, aos H13, S7, A2 e D2 para trabalhos de alto desgaste e grande volume. Para refer\u00eancias cruzadas entre as designa\u00e7\u00f5es AISI, DIN e JIS, consulte nosso cat\u00e1logo. <a href=\"https:\/\/aobosteel.com\/pt\/tool-steel-equivalent-grades\/\">Localizador de equival\u00eancia de a\u00e7o ferramenta<\/a> Abrange o mapeamento completo.<\/p>","protected":false},"excerpt":{"rendered":"<p>How to Select Steel for Plastic Injection Molds The steel used in a plastic injection mold determines how the mold performs, how much it costs to maintain, the quality of every part it produces, and how long it stays in service. A well-matched grade maintains tolerance under pressure, resists wear and corrosion during the molding [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16435,"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-16434","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 v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Plastic Mold Steel Selection | Aobo Steel Tool Steel Supplier<\/title>\n<meta name=\"description\" content=\"How to choose plastic injection mold steel by production volume, plastic type, and surface finish. Compare P20, 420 stainless, H13, S7, A2, D2, and P\/M grades\" \/>\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\/blog\/plastic-injection-mold-steel-selection\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plastic Mold Steel Selection | Aobo Steel Tool Steel Supplier\" \/>\n<meta property=\"og:description\" content=\"How to choose plastic injection mold steel by production volume, plastic type, and surface finish. 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