{"id":5502,"date":"2020-01-10T06:41:16","date_gmt":"2020-01-10T06:41:16","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=5502"},"modified":"2026-03-03T02:36:30","modified_gmt":"2026-03-03T02:36:30","slug":"o-que-e-o-aco-inoxidavel-duplex-e-quais-sao-suas-vantagens-e-desvantagens","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/o-que-e-o-aco-inoxidavel-duplex-e-quais-sao-suas-vantagens-e-desvantagens\/","title":{"rendered":"O que \u00e9 a\u00e7o inoxid\u00e1vel duplex e quais s\u00e3o suas vantagens e desvantagens"},"content":{"rendered":"<h2>O que \u00e9 a\u00e7o inoxid\u00e1vel duplex? Vantagens e desvantagens<\/h2>\n<figure id=\"attachment_5503\" aria-describedby=\"caption-attachment-5503\" style=\"width: 449px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipes123.jpg\" target=\"_blank\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-5503\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipes123.jpg\" alt=\"tubos duplex\" width=\"449\" height=\"320\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipes123.jpg 449w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipes123-300x214.jpg 300w\" sizes=\"(max-width: 449px) 100vw, 449px\" \/><\/a><figcaption id=\"caption-attachment-5503\" class=\"wp-caption-text\">tubos duplex<\/figcaption><\/figure>\n<p>O a\u00e7o inoxid\u00e1vel duplex tem excelente resist\u00eancia \u00e0 corros\u00e3o por pite e tamb\u00e9m \u00e9 um a\u00e7o inoxid\u00e1vel duplex (DSS) que economiza n\u00edquel. Refere-se a ferrita e austenita, cada uma respondendo por cerca de 50%. Geralmente, o conte\u00fado de menos fase \u00e9 o m\u00ednimo. Tamb\u00e9m \u00e9 necess\u00e1rio atingir 30% de a\u00e7o inoxid\u00e1vel.<\/p>\n<p>No caso de baixo conte\u00fado de C, o conte\u00fado de Cr \u00e9 de 18% a 28%, e o conte\u00fado de Ni \u00e9 de 3% a 10%. Alguns a\u00e7os tamb\u00e9m cont\u00eam elementos de liga, como Mo, Cu, Nb, Ti e N. Este tipo de a\u00e7o tem as caracter\u00edsticas de austenita e a\u00e7o inoxid\u00e1vel ferr\u00edtico.<\/p>\n<p>Em compara\u00e7\u00e3o com a ferrita, tem maior plasticidade e resist\u00eancia, sem fragilidade \u00e0 temperatura ambiente, melhorando significativamente <a href=\"https:\/\/www.kaysuns.com\/pt\/perigo-oculto-da-corrosao-intergranular\/\" target=\"_blank\" rel=\"noopener\">corros\u00e3o intergranular<\/a> resist\u00eancia e desempenho de soldagem, al\u00e9m de fragilidade a 475 \u00b0C, alta condutividade t\u00e9rmica e superplasticidade.<\/p>\n<p>Comparado com o a\u00e7o inoxid\u00e1vel austen\u00edtico, tem maior resist\u00eancia e resist\u00eancia significativamente melhorada \u00e0 corros\u00e3o intergranular e corros\u00e3o sob tens\u00e3o de cloreto.<\/p>\n<hr \/>\n<h3>O a\u00e7o inoxid\u00e1vel duplex geralmente pode ser dividido em quatro categorias:<\/h3>\n<p>O primeiro tipo de baixa liga, representando o grau <a href=\"https:\/\/www.kaysuns.com\/pt\/tubo-lean-duplex-uns-s32304\/\" target=\"_blank\" rel=\"noopener\">UNSS32304<\/a>, n\u00e3o cont\u00e9m molibd\u00eanio no a\u00e7o, PREN: 24-25, e pode ser usado no lugar do AISI304 ou 316 em termos de resist\u00eancia \u00e0 corros\u00e3o sob tens\u00e3o.<\/p>\n<p>O segundo tipo \u00e9 do tipo liga m\u00e9dia, representando o grau UNSS31803, PREN: 32-33, com resist\u00eancia \u00e0 corros\u00e3o entre o a\u00e7o inoxid\u00e1vel austen\u00edtico AISI316L e 6% MO N.<\/p>\n<p>O terceiro tipo de tipo de alta liga, geralmente cont\u00e9m 25% CR, tamb\u00e9m cont\u00e9m molibd\u00eanio e nitrog\u00eanio, e alguns tamb\u00e9m cont\u00eam cobre e tungst\u00eanio. Os graus padr\u00e3o s\u00e3o UNSS32550, PREN: resist\u00eancia \u00e0 corros\u00e3o 38-39 superior a a\u00e7o inoxid\u00e1vel duplex 22% Cr.<\/p>\n<p>O quarto tipo de a\u00e7o inoxid\u00e1vel super duplex cont\u00e9m alto teor de molibd\u00eanio e nitrog\u00eanio. Os graus padr\u00e3o s\u00e3o UNSS32750 e alguns tamb\u00e9m cont\u00eam tungst\u00eanio e cobre. PREN&gt; 40, que pode ser usado em condi\u00e7\u00f5es m\u00e9dias adversas e tem boa resist\u00eancia \u00e0 corros\u00e3o e propriedades mec\u00e2nicas abrangentes. Compar\u00e1vel com a\u00e7o inoxid\u00e1vel super austen\u00edtico.<\/p>\n<p>* Nota: PREN: N\u00famero equivalente de resist\u00eancia de corros\u00e3o de corros\u00e3o<\/p>\n<hr \/>\n<h3>Vantagens do a\u00e7o inoxid\u00e1vel duplex<\/h3>\n<h4><strong>1. Comparado com a\u00e7o inoxid\u00e1vel austen\u00edtico<\/strong><\/h4>\n<ul>\n<li>1) A resist\u00eancia da vestimenta \u00e9 mais do que o dobro do a\u00e7o inoxid\u00e1vel austen\u00edtico comum e possui resist\u00eancia pl\u00e1stica suficiente para a conforma\u00e7\u00e3o. A espessura do tanque de armazenamento ou vaso de press\u00e3o feito de a\u00e7o inoxid\u00e1vel duplex \u00e9 30-50% menor do que a do a\u00e7o inoxid\u00e1vel austen\u00edtico comum, o que \u00e9 ben\u00e9fico para a redu\u00e7\u00e3o de custos.<\/li>\n<li>2) Possui excelente resist\u00eancia \u00e0 corros\u00e3o sob tens\u00e3o, principalmente em ambientes contendo \u00edons cloreto. Mesmo o a\u00e7o inoxid\u00e1vel duplex com o menor teor de liga tem maior resist\u00eancia \u00e0 corros\u00e3o sob tens\u00e3o do que o a\u00e7o inoxid\u00e1vel austen\u00edtico. A corros\u00e3o sob tens\u00e3o O problema principal \u00e9 que o a\u00e7o inoxid\u00e1vel austen\u00edtico comum \u00e9 dif\u00edcil de resolver.<\/li>\n<li>3) A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel duplex 2205 mais comum \u00e9 melhor do que a do a\u00e7o inoxid\u00e1vel austen\u00edtico 316L comum em muitos meios. O a\u00e7o inoxid\u00e1vel super duplex tem uma resist\u00eancia \u00e0 corros\u00e3o extremamente alta. Em alguns meios, como \u00e1cido ac\u00e9tico, etc. Ele pode at\u00e9 mesmo substituir o a\u00e7o inoxid\u00e1vel austen\u00edtico de alta liga e at\u00e9 mesmo ligas resistentes \u00e0 corros\u00e3o.<\/li>\n<li>4) Possui boa resist\u00eancia \u00e0 corros\u00e3o local. Comparado com o a\u00e7o inoxid\u00e1vel austen\u00edtico com teor de liga, sua resist\u00eancia ao desgaste e desempenho \u00e0 fadiga por corros\u00e3o s\u00e3o melhores do que o a\u00e7o inoxid\u00e1vel austen\u00edtico.<\/li>\n<li>5) Possui coeficiente de expans\u00e3o linear menor que o a\u00e7o inoxid\u00e1vel austen\u00edtico, \u00e9 pr\u00f3ximo ao a\u00e7o carbono e \u00e9 adequado para conex\u00e3o com a\u00e7o carbono. Tem um importante significado de engenharia, como a produ\u00e7\u00e3o de placas ou revestimentos compostos.<\/li>\n<\/ul>\n<h4><strong>2. Comparado com o a\u00e7o inoxid\u00e1vel ferr\u00edtico, as vantagens do a\u00e7o inoxid\u00e1vel duplex s\u00e3o as seguintes:<\/strong><\/h4>\n<ul>\n<li>1) As propriedades mec\u00e2nicas abrangentes s\u00e3o superiores \u00e0s do a\u00e7o inoxid\u00e1vel ferr\u00edtico, especialmente a tenacidade do pl\u00e1stico. N\u00e3o \u00e9 t\u00e3o sens\u00edvel \u00e0 fragilidade quanto o a\u00e7o inoxid\u00e1vel ferr\u00edtico.<\/li>\n<li>2) Exceto a resist\u00eancia \u00e0 corros\u00e3o sob tens\u00e3o, outra resist\u00eancia \u00e0 corros\u00e3o local \u00e9 melhor do que o a\u00e7o inoxid\u00e1vel ferr\u00edtico.<\/li>\n<li>3) O desempenho do processo de trabalho a frio e o desempenho da conforma\u00e7\u00e3o a frio s\u00e3o muito melhores do que o a\u00e7o inoxid\u00e1vel ferr\u00edtico.<\/li>\n<li>4) O desempenho de soldagem \u00e9 muito melhor do que o a\u00e7o inoxid\u00e1vel ferr\u00edtico. Geralmente, nenhum pr\u00e9-aquecimento \u00e9 necess\u00e1rio antes da soldagem e nenhum tratamento t\u00e9rmico \u00e9 necess\u00e1rio.<\/li>\n<li>5) A faixa de aplica\u00e7\u00e3o \u00e9 mais ampla do que o a\u00e7o inoxid\u00e1vel ferr\u00edtico.<\/li>\n<\/ul>\n<h3><\/h3>\n<hr \/>\n<h3>Aplica\u00e7\u00f5es de a\u00e7o inoxid\u00e1vel duplex<\/h3>\n<p>Devido \u00e0 alta resist\u00eancia do a\u00e7o duplex, muitas vezes ele pode economizar material, como a redu\u00e7\u00e3o da espessura da parede do tubo duplex. Pegue um com a finalidade de <a href=\"https:\/\/www.kaysuns.com\/pt\/duplex-2205-stainless-steel-pipe\/\" target=\"_blank\">SAF2205<\/a>, SAF2507.<\/p>\n<p>SAF2205 \u00e9 adequado para uso em ambientes que contenham cloro. O material \u00e9 adequado para uso em refinarias contendo cloreto ou outros meios de processo.<\/p>\n<p>O SAF2205 \u00e9 especialmente adequado para trocadores de calor que usam solu\u00e7\u00f5es aquosas contendo cloro ou \u00e1gua salobra como meio de resfriamento. Este material tamb\u00e9m \u00e9 adequado para solu\u00e7\u00f5es dilu\u00eddas de \u00e1cido sulf\u00farico e \u00e1cidos org\u00e2nicos puros e suas misturas.<\/p>\n<p>Usado desde 1983, o SAF2507 foi desenvolvido para ambientes agressivos que cont\u00eam cloro e tem muitas aplica\u00e7\u00f5es importantes na ind\u00fastria de processamento.<\/p>","protected":false},"featured_media":5503,"template":"","categories":[186],"tags":[],"class_list":["post-5502","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Is Duplex Stainless Steel And What Are Its Advantages And Disadvantages - Stainless Steel Pipe and Fittings | KAYSUNS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kaysuns.com\/pt\/blog\/o-que-e-o-aco-inoxidavel-duplex-e-quais-sao-suas-vantagens-e-desvantagens\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is Duplex Stainless Steel And What Are Its Advantages And Disadvantages - Stainless Steel Pipe and Fittings | KAYSUNS\" \/>\n<meta property=\"og:description\" content=\"What Is Duplex Stainless Steel?\u00a0Advantages And Disadvantages Duplex stainless steel has excellent pitting corrosion resistance and is also a nickel-saving stainless steel Duplex Stainless Steel (DSS). 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It refers to ferrite and austenite each accounting for about 50%. Generally, the content of less phase is the least Also need to reach 30% of stainless steel. 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