{"id":5520,"date":"2020-01-23T06:36:23","date_gmt":"2020-01-23T06:36:23","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=5520"},"modified":"2025-07-01T06:36:38","modified_gmt":"2025-07-01T06:36:38","slug":"caracteristicas-classificacao-e-desenvolvimento-de-tubos-de-aco-inoxidavel-duplex","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/caracteristicas-classificacao-e-desenvolvimento-de-tubos-de-aco-inoxidavel-duplex\/","title":{"rendered":"Caracter\u00edsticas, Classifica\u00e7\u00e3o e Desenvolvimento de Tubos Duplex de A\u00e7o Inoxid\u00e1vel"},"content":{"rendered":"<h2>Caracter\u00edsticas, Classifica\u00e7\u00e3o e Desenvolvimento de Tubos Duplex de A\u00e7o Inoxid\u00e1vel<\/h2>\n<h3>Desenvolvimento de a\u00e7o inoxid\u00e1vel duplex<\/h3>\n<p>Os a\u00e7os inoxid\u00e1veis duplex s\u00e3o chamados de \u201cduplex\u201d porque sua microestrutura metal\u00fargica consiste em dois tipos de ferrita e gr\u00e3os de a\u00e7o inoxid\u00e1vel austen\u00edtico. Quando o a\u00e7o inoxid\u00e1vel duplex derrete, ele primeiro se solidifica em uma estrutura de ferrite completa quando se solidifica do estado l\u00edquido. Conforme o material esfria at\u00e9 a temperatura ambiente, cerca de metade dos gr\u00e3os de ferrita s\u00e3o transformados em gr\u00e3os de austenita. Como resultado, cerca de 50% da microestrutura era uma fase de austenita e 50% era uma fase de ferrita.<\/p>\n<p><a href=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipe.jpg\" target=\"_blank\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-5521\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipe.jpg\" alt=\"tubo duplex\" width=\"258\" height=\"342\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipe.jpg 258w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/01\/duplex-pipe-226x300.jpg 226w\" sizes=\"(max-width: 258px) 100vw, 258px\" \/><\/a><\/p>\n<p>A resist\u00eancia do a\u00e7o inoxid\u00e1vel duplex \u00e9 cerca de duas vezes maior do que a do a\u00e7o inoxid\u00e1vel austen\u00edtico convencional ou do a\u00e7o inoxid\u00e1vel ferr\u00edtico. Portanto, os projetistas podem reduzir a espessura da parede em algumas aplica\u00e7\u00f5es. A resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel depende principalmente de sua composi\u00e7\u00e3o qu\u00edmica. Na maioria das aplica\u00e7\u00f5es, os a\u00e7os inoxid\u00e1veis duplex apresentam alta resist\u00eancia \u00e0 corros\u00e3o devido ao seu alto teor de cromo, que \u00e9 vantajoso em \u00e1cidos oxidantes, e cont\u00eam quantidades suficientes de <a href=\"https:\/\/www.kaysuns.com\/pt\/papel-do-molibdenio-em-tubos-e-conexoes-de-aco-inoxidavel\/\" target=\"_blank\" rel=\"noopener\">molibd\u00eanio<\/a> e n\u00edquel para resistir a \u00e1cidos moderadamente redutores. Corros\u00e3o do meio.<\/p>\n<p>Os a\u00e7os inoxid\u00e1veis duplex s\u00e3o resistentes \u00e0 corros\u00e3o por picadas de cloreto e fendas, dependendo de seus teores de cromo, molibd\u00eanio, tungst\u00eanio e nitrog\u00eanio. O teor relativamente alto de cromo, molibd\u00eanio e nitrog\u00eanio dos a\u00e7os inoxid\u00e1veis duplex os torna muito resistentes \u00e0 corros\u00e3o por picadas e rachaduras de cloretos. Eles t\u00eam uma s\u00e9rie de propriedades de resist\u00eancia \u00e0 corros\u00e3o diferentes, ambas equivalentes \u00e0 resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel 316, como o a\u00e7o inoxid\u00e1vel duplex econ\u00f4mico 2101 \u00a9, e o equivalente ao a\u00e7o inoxid\u00e1vel molibd\u00eanio 6%, como <a href=\"https:\/\/www.kaysuns.com\/pt\/duplex-2205-stainless-steel-pipe\/\" target=\"_blank\">SAF 2507<\/a> \u00a9.<\/p>\n<h3>Caracter\u00edsticas do a\u00e7o inoxid\u00e1vel duplex<\/h3>\n<p>O a\u00e7o inoxid\u00e1vel duplex tem uma resist\u00eancia muito boa a <a href=\"https:\/\/www.kaysuns.com\/pt\/rachaduras-por-corrosao-sob-tensao-em-aco-inoxidavel\/\" target=\"_blank\" rel=\"noopener\">rachaduras por corros\u00e3o sob tens\u00e3o<\/a> (SCC). Essa propriedade \u00e9 \"herdada\" do lado da ferrita. A resist\u00eancia de todos os a\u00e7os inoxid\u00e1veis duplex \u00e0 rachadura por corros\u00e3o sob tens\u00e3o por cloreto \u00e9 significativamente melhor do que a dos a\u00e7os inoxid\u00e1veis austen\u00edticos da s\u00e9rie 300. Os tipos de a\u00e7o inoxid\u00e1vel austen\u00edtico padr\u00e3o, como 304 e 316, podem sofrer rachaduras por corros\u00e3o sob tens\u00e3o na presen\u00e7a de \u00edons cloreto, ar \u00famido e temperaturas elevadas. Portanto, em muitas aplica\u00e7\u00f5es no setor qu\u00edmico, onde h\u00e1 um risco maior de corros\u00e3o sob tens\u00e3o, os a\u00e7os inoxid\u00e1veis austen\u00edticos da s\u00e9rie 300 podem sofrer rachaduras por corros\u00e3o sob tens\u00e3o, <a href=\"https:\/\/www.kaysuns.com\/pt\/duplex-2205-stainless-steel-pipe\/\" target=\"_blank\">tubos de a\u00e7o inoxid\u00e1vel duplex<\/a> s\u00e3o frequentemente usados em vez de tubos de a\u00e7o inoxid\u00e1vel austen\u00edtico.<\/p>","protected":false},"featured_media":5521,"template":"","categories":[186],"tags":[],"class_list":["post-5520","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>Characteristics, Classification And Development Of Duplex Stainless Steel Pipes - 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\/caracteristicas-classificacao-e-desenvolvimento-de-tubos-de-aco-inoxidavel-duplex\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Characteristics, Classification And Development Of Duplex Stainless Steel Pipes - Stainless Steel Pipe and Fittings | KAYSUNS\" \/>\n<meta property=\"og:description\" content=\"Characteristics, Classification And Development Of Duplex Stainless Steel Pipes Development\u00a0of duplex stainless steel Duplex stainless steels are called \u201cduplex\u201d because their metallurgical microstructure consists of two types of ferrite and austenitic stainless steel grains. 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