{"id":6214,"date":"2020-07-08T08:14:33","date_gmt":"2020-07-08T08:14:33","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6214"},"modified":"2025-07-01T06:30:47","modified_gmt":"2025-07-01T06:30:47","slug":"o-papel-do-cromo-no-aco-inoxidavel","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/the-role-of-chromium-in-stainless-steel\/","title":{"rendered":"O papel do cromo no a\u00e7o inoxid\u00e1vel"},"content":{"rendered":"<h2 class=\"wp-block-heading\">O cromo \u00e9 o elemento de liga mais importante no a\u00e7o inoxid\u00e1vel austen\u00edtico. <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Qual \u00e9 a fun\u00e7\u00e3o do cromo no a\u00e7o inoxid\u00e1vel? A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel austen\u00edtico se deve principalmente ao fato de que o cromo no a\u00e7o inoxid\u00e1vel promove a passiva\u00e7\u00e3o do a\u00e7o e mant\u00e9m o a\u00e7o em um estado est\u00e1vel e passivo sob a a\u00e7\u00e3o do material encontrado.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>O efeito do cromo na estrutura de a\u00e7o inoxid\u00e1vel<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No a\u00e7o inoxid\u00e1vel austen\u00edtico, o cromo \u00e9 um elemento que forma e estabiliza fortemente a ferrita, estreitando a zona de austenita, \u00e0 medida que o teor do a\u00e7o aumenta, a ferrita (\u03b4) pode aparecer na organiza\u00e7\u00e3o do a\u00e7o inoxid\u00e1vel austen\u00edtico, pesquisas mostram que no cromo-n\u00edquel a\u00e7o inoxid\u00e1vel austen\u00edtico, quando o teor de carbono \u00e9 0,1% e o teor de cromo \u00e9 18%, para se obter uma estrutura de austenita \u00fanica est\u00e1vel \u00e9 necess\u00e1rio o teor m\u00ednimo de n\u00edquel, cerca de 8%. A este respeito, o a\u00e7o inoxid\u00e1vel austen\u00edtico de cromo-n\u00edquel 18Cr-8Ni comumente usado \u00e9 o mais adequado para o teor de cromo-n\u00edquel.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.kaysuns.com\/pt\/tubulacoes-de-aco-inoxidavel\/\" target=\"_blank\"><img fetchpriority=\"high\" decoding=\"async\" width=\"393\" height=\"393\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/03\/stainless-steel-tubes.jpg\" alt=\"tubos de a\u00e7o inoxid\u00e1vel kaysuns\" class=\"wp-image-5709\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/03\/stainless-steel-tubes.jpg 393w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/03\/stainless-steel-tubes-300x300.jpg 300w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/03\/stainless-steel-tubes-150x150.jpg 150w\" sizes=\"(max-width: 393px) 100vw, 393px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Nos a\u00e7os inoxid\u00e1veis austen\u00edticos, com o aumento do teor de cromo, aumenta a tend\u00eancia de forma\u00e7\u00e3o de algumas fases intermet\u00e1licas (como a fase \u03b4).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quando o a\u00e7o cont\u00e9m <a href=\"https:\/\/www.kaysuns.com\/pt\/papel-do-molibdenio-em-tubos-e-conexoes-de-aco-inoxidavel\/\" target=\"_blank\">molibd\u00eanio<\/a>O teor de cromo aumentar\u00e1 e x se formar\u00e1 igual, como mencionado anteriormente, a precipita\u00e7\u00e3o da fase \u03c3, x n\u00e3o s\u00f3 reduz significativamente a plasticidade e a tenacidade do a\u00e7o, mas tamb\u00e9m reduz a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o sob determinadas condi\u00e7\u00f5es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O aumento do teor de cromo no a\u00e7o inoxid\u00e1vel austen\u00edtico pode fazer a martensita diminuir a temperatura do hidrocarboneto (Ms), melhorando assim a estabilidade da matriz de austenita. Portanto, o a\u00e7o inoxid\u00e1vel austen\u00edtico com alto teor de cromo (por exemplo, mais do que 20%) \u00e9 dif\u00edcil de obter uma estrutura de martensita, mesmo ap\u00f3s trabalho a frio e tratamento a baixa temperatura.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O cromo \u00e9 um forte elemento formador de carboneto e n\u00e3o \u00e9 exce\u00e7\u00e3o no a\u00e7o inoxid\u00e1vel austen\u00edtico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>O efeito do cromo no desempenho<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Geralmente vem, enquanto o austen\u00edtico <a href=\"https:\/\/www.kaysuns.com\/pt\/tubos-de-aco-inoxidavel\/\" target=\"_blank\">tubo de a\u00e7o inoxid\u00e1vel<\/a> mant\u00e9m uma estrutura de austenita completa sem a forma\u00e7\u00e3o de ferrita delta, etc., apenas melhora o teor de cromo n\u00e3o ter\u00e1 um efeito significativo nas propriedades mec\u00e2nicas, e o cromo afetar\u00e1 a austenita.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O efeito mais importante do desempenho do a\u00e7o inoxid\u00e1vel \u00e9 a resist\u00eancia \u00e0 corros\u00e3o, principalmente como segue: <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O cromo melhora o desempenho do meio de resist\u00eancia \u00e0 oxida\u00e7\u00e3o do a\u00e7o e do meio de cloreto \u00e1cido; sob a a\u00e7\u00e3o combinada de n\u00edquel, molibd\u00eanio e cobre, o cromo melhora a resist\u00eancia do a\u00e7o a alguns meios redutores, \u00e1cido org\u00e2nico, ureia e meios alcalinos; o cromo tamb\u00e9m melhora a resist\u00eancia do a\u00e7o \u00e0 corros\u00e3o localizada, como <a href=\"https:\/\/www.kaysuns.com\/pt\/perigo-oculto-da-corrosao-intergranular\/\" target=\"_blank\">corros\u00e3o intergranular<\/a>corros\u00e3o por pite, corros\u00e3o em fendas e desempenho sob tens\u00e3o sob determinadas condi\u00e7\u00f5es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tem o maior impacto na sensibilidade do a\u00e7o inoxid\u00e1vel austen\u00edtico intergranular, o fator \u00e9 o teor de carbono no a\u00e7o e outros elementos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O papel do cromo na resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel com as condi\u00e7\u00f5es do meio experimental e o ambiente real de uso.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na solu\u00e7\u00e3o de ebuli\u00e7\u00e3o de MgCl2, o papel do cromo \u00e9 geralmente prejudicial, mas em meio aquoso contendo Cl- e oxig\u00eanio, sob alta temperatura e alta press\u00e3o de \u00e1gua e condi\u00e7\u00f5es de corros\u00e3o sob tens\u00e3o com corros\u00e3o por pite como origem, aumentando o teor de cromo no a\u00e7o. ben\u00e9fico para a resist\u00eancia \u00e0 corros\u00e3o sob tens\u00e3o. O cromo tamb\u00e9m pode prevenir a austenita de a\u00e7o inoxid\u00e1vel e ligas que tendem a aparecer entre os gr\u00e3os devido ao aumento do teor de n\u00edquel. A tend\u00eancia de corros\u00e3o sob tens\u00e3o, o efeito do cromo na corros\u00e3o sob tens\u00e3o de causticidade aberta (Nq0H) tamb\u00e9m \u00e9 ben\u00e9fica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Al\u00e9m de ter uma influ\u00eancia importante na resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel austen\u00edtico de n\u00famero negativo, o cromo tamb\u00e9m pode melhorar significativamente a resist\u00eancia \u00e0 oxida\u00e7\u00e3o, a resist\u00eancia \u00e0 sulfeta\u00e7\u00e3o e a resist\u00eancia \u00e0 corros\u00e3o por sal de fus\u00e3o de tais a\u00e7os.<\/p>","protected":false},"featured_media":5709,"template":"","categories":[186],"tags":[],"class_list":["post-6214","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Role Of Chromium In Stainless Steel - 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