{"id":2179,"date":"2021-07-19T06:18:56","date_gmt":"2021-07-19T06:18:56","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2179"},"modified":"2021-07-19T08:32:55","modified_gmt":"2021-07-19T08:32:55","slug":"the-advantages-of-904l-stainless-steel","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/pt\/the-advantages-of-904l-stainless-steel\/","title":{"rendered":"Os benef\u00edcios do a\u00e7o inoxid\u00e1vel 904L"},"content":{"rendered":"<p>A\u00e7o inoxid\u00e1vel super austen\u00edtico 904L (<a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/904l-stainless-steel\/\">UNS N08904<\/a>, EN1.4539) \u00e9 um a\u00e7o inoxid\u00e1vel austen\u00edtico de alta liga com baixo teor de carbono, especialmente concebido para condi\u00e7\u00f5es de corros\u00e3o severas. Possui alto teor de cromo e n\u00edquel, a adi\u00e7\u00e3o de cobre o torna resistente a \u00e1cidos fortes, especialmente \u00e1cido sulf\u00farico dilu\u00eddo, especialmente resistente \u00e0 corros\u00e3o por brecas de cloreto e \u00e0 corros\u00e3o por tens\u00e3o, n\u00e3o \u00e9 f\u00e1cil aparecer manchas de eros\u00e3o e fendas, a resist\u00eancia ao ataque por cavita\u00e7\u00e3o \u00e9 ligeiramente superior \u00e0 de outros a\u00e7os. Possui boa usinabilidade e soldabilidade, em muitos campos industriais possui uma ampla gama de aplica\u00e7\u00f5es: vasos e tubula\u00e7\u00f5es petroqu\u00edmicas, como reatores, etc.; Unidade de dessulfura\u00e7\u00e3o de gases de combust\u00e3o de usinas de energia; Planta de tratamento de \u00e1gua do mar; Equipamentos da ind\u00fastria farmac\u00eautica, ind\u00fastria aliment\u00edcia e outros campos.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Estrutura metalogr\u00e1fica<\/strong><\/p>\n<p>O 904L \u00e9 completamente austen\u00edtico. Comparado com os a\u00e7os inoxid\u00e1veis austen\u00edticos com alto teor de molibd\u00eanio, o 904L \u00e9 menos sens\u00edvel \u00e0 precipita\u00e7\u00e3o de ferrita e fase \u03b1.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Desempenho de soldagem<\/strong><\/p>\n<p>Assim como o a\u00e7o inoxid\u00e1vel comum, o 904 L pode ser soldado de v\u00e1rias maneiras. Os m\u00e9todos de soldagem mais utilizados s\u00e3o a soldagem manual com arco el\u00e9trico ou a soldagem protegida por g\u00e1s inerte. O el\u00e9ctrodo ou o metal do fio baseiam-se na composi\u00e7\u00e3o do metal-base e t\u00eam uma pureza mais elevada. O teor de molibd\u00eanio \u00e9 superior ao do metal-base. Geralmente n\u00e3o \u00e9 necess\u00e1rio pr\u00e9-aquecimento antes da soldagem, exceto em climas frios, para evitar a condensa\u00e7\u00e3o de vapor de \u00e1gua; a parte junta ou a \u00e1rea adjacente podem ser aquecidas uniformemente. Note-se que a temperatura local n\u00e3o deve exceder 100 \u00b0C, para evitar a acumula\u00e7\u00e3o de carbono e a corros\u00e3o intergranular. Para a soldagem, deve ser utilizada energia de linha pequena, cont\u00ednua e com velocidade de soldagem r\u00e1pida. Geralmente, n\u00e3o \u00e9 necess\u00e1rio tratamento t\u00e9rmico ap\u00f3s a soldagem. Se for necess\u00e1rio tratamento t\u00e9rmico, este deve ser realizado a uma temperatura de 1100 ~ 1150 \u00b0C e depois rapidamente resfriado. Materiais de soldagem compat\u00edveis: el\u00e9ctrodo (E385-16\/17), fio de solda (ER385).<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Desempenho de usinagem<\/strong><\/p>\n<p>As caracter\u00edsticas de usinagem de <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/904l-stainless-steel\/\">904 L<\/a> S\u00e3o semelhantes aos de outros a\u00e7os inoxid\u00e1veis austen\u00edticos, e h\u00e1 uma tend\u00eancia \u00e0 pegajidade do corte e ao endurecimento durante a usinagem. \u00c9 necess\u00e1rio utilizar ferramentas de corte de carbeto com \u00e2ngulo positivo, com vulcaniza\u00e7\u00e3o e \u00f3leo clorado como refrigerante de corte; equipamentos e processos devem ser selecionados de forma a reduzir o endurecimento do corte como premissa. \u00c9 necess\u00e1rio evitar velocidades de corte lentas e alimenta\u00e7\u00e3o elevadas no processo de corte.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel 904L<\/strong><\/p>\n<p>O 904L possui boa capacidade de convers\u00e3o de ativa\u00e7\u00e3o-passiva\u00e7\u00e3o; possui excelente resist\u00eancia \u00e0 corros\u00e3o, resist\u00eancia a cavita\u00e7\u00e3o e boa resist\u00eancia \u00e0 corros\u00e3o por fenda em \u00e1cidos n\u00e3o oxidantes, como \u00e1cido sulf\u00farico, \u00e1cido ac\u00e9tico, \u00e1cido f\u00f3rmico e \u00e1cido fosf\u00f3rico; possui boa resist\u00eancia \u00e0 corros\u00e3o em meio neutro contendo \u00edons clorados. \u00c9 adequado para todas as concentra\u00e7\u00f5es de \u00e1cido sulf\u00farico abaixo de 70 \u00b0C e possui boa resist\u00eancia \u00e0 corros\u00e3o do \u00e1cido ac\u00e9tico e da mistura de \u00e1cido f\u00f3rmico e \u00e1cido ac\u00e9tico em qualquer concentra\u00e7\u00e3o e em qualquer temperatura sob press\u00e3o normal.<\/p>\n<p>Devido ao baixo teor de carbono (m\u00e1ximo de 0,020%) do 904L, n\u00e3o h\u00e1 precipita\u00e7\u00e3o de carboneto sob condi\u00e7\u00f5es normais de tratamento t\u00e9rmico e soldagem. Isso elimina a possibilidade de corros\u00e3o intergranular que normalmente ocorre ap\u00f3s o tratamento t\u00e9rmico e a soldagem. O alto teor de Cr-Ni-Mo e a adi\u00e7\u00e3o de cobre tornam o 904L passivado mesmo em ambientes de redu\u00e7\u00e3o, como \u00e1cido sulf\u00farico e \u00e1cido f\u00f3rmico. O alto teor de n\u00edquel faz com que ele tenha uma baixa taxa de corros\u00e3o no estado ativo. Na faixa de concentra\u00e7\u00e3o de 0 a 98% de \u00e1cido sulf\u00farico puro, o 904L pode ser utilizado a uma temperatura at\u00e9 40\u00b0C. Na faixa de concentra\u00e7\u00e3o de 0 a 85% de \u00e1cido fosf\u00f3rico puro, ele ainda apresenta boa resist\u00eancia \u00e0 corros\u00e3o.<\/p>\n<p><a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/904l-stainless-steel\/\">904L SS<\/a> \u00c9 superior ao a\u00e7o inoxid\u00e1vel comum em termos de resist\u00eancia \u00e0 corros\u00e3o de todos os fosfatos. No \u00e1cido n\u00edtrico altamente oxidante, o 904L apresenta uma baixa resist\u00eancia \u00e0 corros\u00e3o em compara\u00e7\u00e3o com os a\u00e7os de liga sem molibd\u00eanio. No \u00e1cido clor\u00eddrico, a utiliza\u00e7\u00e3o do 904L \u00e9 limitada a concentra\u00e7\u00f5es inferiores a 1-2%, onde a sua resist\u00eancia \u00e0 corros\u00e3o \u00e9 superior \u00e0 do a\u00e7o inoxid\u00e1vel convencional. O a\u00e7o 904L apresenta uma forte resist\u00eancia \u00e0 corros\u00e3o por fendas em solu\u00e7\u00f5es clor\u00eddricas, solu\u00e7\u00f5es de hidr\u00f3xido concentrado e ambientes ricos em sulfureto, devido ao seu alto teor de n\u00edquel, que reduz as taxas de corros\u00e3o em po\u00e7os e fendas. Os a\u00e7os inoxid\u00e1veis austen\u00edticos comuns podem ser sens\u00edveis \u00e0 corros\u00e3o por tens\u00e3o em temperaturas acima de 60 \u00b0 C em ambientes ricos em cloreto. Essa sensibilidade pode ser reduzida aumentando o teor de n\u00edquel do a\u00e7o inoxid\u00e1vel.<\/p>","protected":false},"excerpt":{"rendered":"<p>Super austenitic stainless steel 904L (UNS N08904, EN1.4539) is a high alloy Austenitic stainless steel with low carbon content, specially designed for harsh corrosion conditions. It has high chromium content and nickel content, the addition of copper makes it has strong acid resistance especially dilute sulfuric acid, especially high resistance to chloride gap corrosion and [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2180,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Super austenitic stainless steel 904L (UNS N08904, EN1.4539) is a high alloy Austenitic stainless steel with low carbon content, specially designed for harsh corrosion conditions.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"WLD Stainless\"\/>\n\t<link rel=\"canonical\" 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07:13:40","updated":"2026-09-23 08:20:40","focus_keyword":null,"additional_keywords":null,"truseo_locale":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/wldstainless.com\/pt\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/wldstainless.com\/pt\/category\/news\/\" title=\"News\">News<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tThe advantages of 904L stainless steel\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/wldstainless.com\/pt"},{"label":"News","link":"https:\/\/wldstainless.com\/pt\/category\/news\/"},{"label":"The advantages of 904L stainless 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