{"id":2167,"date":"2021-07-15T06:50:11","date_gmt":"2021-07-15T06:50:11","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2167"},"modified":"2021-07-15T06:54:20","modified_gmt":"2021-07-15T06:54:20","slug":"nickel-austenitic-stainless-steel-grades","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/pt\/nickel-austenitic-stainless-steel-grades\/","title":{"rendered":"Grades de a\u00e7o inoxid\u00e1vel austen\u00edtico de n\u00edquel"},"content":{"rendered":"<p>O n\u00edquel \u00e9 conhecido por ser um elemento de liga\u00e7\u00e3o caro e \u00e9 essencial em algumas aplica\u00e7\u00f5es em que tanto a resist\u00eancia \u00e0 corros\u00e3o por tens\u00e3o quanto a estrutura austen\u00edtica s\u00e3o necess\u00e1rias. Por exemplo, a resist\u00eancia ao atrito \u00e9 importante em ambientes de alta temperatura, onde o a\u00e7o austen\u00edtico \u00e9 mais suscet\u00edvel a essa corros\u00e3o. <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">A\u00e7o inoxid\u00e1vel<\/a> S\u00e3o necess\u00e1rios a\u00e7o inoxid\u00e1vel austen\u00edtico semelhante aos tradicionais, pois a presen\u00e7a de uma segunda face \u00e9 uma caracter\u00edstica importante dos a\u00e7os inoxid\u00e1veis austen\u00edticos ricos em n\u00edquel devido \u00e0 menor energia de falhas de empilhamento. Os a\u00e7os inoxid\u00e1veis austen\u00edticos s\u00e3o propensos a fissuras de corros\u00e3o por tens\u00e3o (SCC). No entanto, a resist\u00eancia \u00e0 corros\u00e3o por tens\u00e3o \u00e9 significativamente melhorada quando o teor de n\u00edquel excede 20%. O efeito do n\u00edquel na intensidade da tens\u00e3o de corte (105 \u00b0C, solu\u00e7\u00e3o aquosa de NaCl 22%) em ligas Fe-Ni-Cr contendo 16 % a 21% de cromo \u00e9 estudado. O a\u00e7o inoxid\u00e1vel austen\u00edtico rico em n\u00edquel (NiASS) pode ser considerado uma classe distinta de a\u00e7o inoxid\u00e1vel. Na verdade, a resist\u00eancia \u00e0 corros\u00e3o por tens\u00e3o dos a\u00e7os inoxid\u00e1veis bif\u00e1sicos e ferr\u00edticos \u00e9 compar\u00e1vel \u00e0 resist\u00eancia desses a\u00e7os quando o teor de n\u00edquel excede 30%. Alguns lotes limitados de a\u00e7o inoxid\u00e1vel austen\u00edtico rico em n\u00edquel <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">A\u00e7o inoxid\u00e1vel<\/a> Est\u00e3o listados na tabela abaixo. Os a\u00e7os inoxid\u00e1veis super-aust\u00eanicos 254SMO e 654SMO foram desenvolvidos especificamente para a ind\u00fastria de petr\u00f3leo e g\u00e1s. As aplica\u00e7\u00f5es t\u00edpicas s\u00e3o o resfriamento de \u00e1gua do mar, a branqueamento de celulose e a instala\u00e7\u00e3o de tubula\u00e7\u00f5es hidr\u00e1ulicas e instrumentais.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Grades de a\u00e7o inoxid\u00e1vel Ni-Austen\u00edtico<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"118\">Liga de alum\u00ednio<\/td>\n<td width=\"63\">C<\/td>\n<td width=\"63\">Si<\/td>\n<td width=\"63\">Mn<\/td>\n<td width=\"63\">Cr<\/td>\n<td width=\"63\">Ni<\/td>\n<td width=\"63\">Mo<\/td>\n<td width=\"63\">W<\/td>\n<td width=\"63\">Co<\/td>\n<td width=\"63\">Cu<\/td>\n<td width=\"63\">Nb<\/td>\n<td width=\"63\">N<\/td>\n<\/tr>\n<tr>\n<td width=\"118\">254SMo<\/td>\n<td width=\"63\">0.01<\/td>\n<td width=\"63\">0.8<\/td>\n<td width=\"63\">1.0<\/td>\n<td width=\"63\">20<\/td>\n<td width=\"63\">18<\/td>\n<td width=\"63\">6.1<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">0.7<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">0.2<\/td>\n<\/tr>\n<tr>\n<td width=\"118\">654SMo<\/td>\n<td width=\"63\">0.01<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">3.5<\/td>\n<td width=\"63\">24<\/td>\n<td width=\"63\">22<\/td>\n<td width=\"63\">7.3<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">0.5<\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Sanicro 25<\/td>\n<td width=\"63\">0.1<\/td>\n<td width=\"63\">0.2<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">22.5<\/td>\n<td width=\"63\">25<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">3.6<\/td>\n<td width=\"63\">3.5<\/td>\n<td width=\"63\">3.0<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">0.23<\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Sanicro 28<\/td>\n<td width=\"63\">0.02<\/td>\n<td width=\"63\">0.6<\/td>\n<td width=\"63\">2.0<\/td>\n<td width=\"63\">27<\/td>\n<td width=\"63\">31<\/td>\n<td width=\"63\">3.5<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">1.0<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Liga 800<\/td>\n<td width=\"63\">0.07<\/td>\n<td width=\"63\">0.6<\/td>\n<td width=\"63\">0.6<\/td>\n<td width=\"63\">20.5<\/td>\n<td width=\"63\">30.5<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<\/tr>\n<tr>\n<td width=\"118\">353MA<\/td>\n<td width=\"63\">0.05<\/td>\n<td width=\"63\">1.6<\/td>\n<td width=\"63\">1.5<\/td>\n<td width=\"63\">25<\/td>\n<td width=\"63\">35<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">0.16<\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Liga 825<\/td>\n<td width=\"63\">0.03<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">0.8<\/td>\n<td width=\"63\">20<\/td>\n<td width=\"63\">38.5<\/td>\n<td width=\"63\">2.6<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Liga 625<\/td>\n<td width=\"63\">0.03<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">21<\/td>\n<td width=\"63\">Bal<\/td>\n<td width=\"63\">8.5<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Liga 690<\/td>\n<td width=\"63\">0.02<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\">30<\/td>\n<td width=\"63\">60<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<\/tr>\n<tr>\n<td width=\"118\">Liga 600<\/td>\n<td width=\"63\">0.05<\/td>\n<td width=\"63\">0.4<\/td>\n<td width=\"63\">0.8<\/td>\n<td width=\"63\">16.5<\/td>\n<td width=\"63\">Bal<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\">0.5<\/td>\n<td width=\"63\"><\/td>\n<td width=\"63\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>O SANICRO 25, uma liga de 22Cr-25Ni, \u00e9 projetado para uso em caldeiras at\u00e9 700 \u00b0C. \u00c9 um material adequado para superaquecedores e reaquecedores devido \u00e0 sua boa resist\u00eancia \u00e0 fratura por cisalhamento e \u00e0 alta resist\u00eancia \u00e0 corros\u00e3o a altas temperaturas. Na verdade, a resist\u00eancia \u00e0 fratura por cisalhamento do SANICRO 25 \u00e9 superior \u00e0 de a maioria dos a\u00e7os inoxid\u00e1veis austen\u00edticos na faixa de 600~750 \u00b0C. Em ambientes altamente corrosivos e \u00e1cidos, o Sanicro 28 geralmente \u00e9 a melhor escolha. \u00c9 utilizado em po\u00e7os de perfura\u00e7\u00e3o de alta intensidade com tubos, revestimentos e revestimentos de g\u00e1s \u00e1cido, e outras aplica\u00e7\u00f5es incluem aquecedores, sistemas de bomba e bombas e recipientes em plantas de \u00e1cido fosf\u00f3rico de alta intensidade e plantas de \u00e1cido fosf\u00f3rico superintensivo.<\/p>\n<p>O a\u00e7o 800 \u00e9 frequentemente utilizado nos intervalos de temperatura de 550 a 1100 \u00b0C, o que exige excelente resist\u00eancia ao flu\u00eancia, boa resist\u00eancia \u00e0 corros\u00e3o a altas temperaturas e alta resist\u00eancia a altas temperaturas dos materiais. Estas ligas tamb\u00e9m s\u00e3o utilizadas nas entradas e sa\u00eddas das instala\u00e7\u00f5es de produ\u00e7\u00e3o de am\u00f4nia, metanol e g\u00e1s civil, bem como nos tubos de combust\u00e3o usados na produ\u00e7\u00e3o de cloreto de vinila e etileno. Outras aplica\u00e7\u00f5es incluem tubos de troca de calor e tubos de radia\u00e7\u00e3o para leitos de combust\u00e3o fluidizada e pe\u00e7as de fornos de tratamento t\u00e9rmico, como tubos de silenciador e mangas protetoras para termopares.<\/p>\n<p>A liga 353Ma, com base em 25Cr-35Ni, foi desenvolvida para uso em fornos de craquelamento e tubos de reforma\u00e7\u00e3o, onde os gases sint\u00e9ticos s\u00e3o tratados em ambientes onde a carboniza\u00e7\u00e3o e a absor\u00e7\u00e3o de nitrog\u00eanio podem ser problem\u00e1ticas. Apesar de haver outras alternativas que cont\u00eam mais cromo, a 353 MA \u00e9 a melhor escolha. Uma das raz\u00f5es \u00e9 que cont\u00e9m o elemento Ce, que ajuda a formar uma camada de \u00f3xido superficial muito est\u00e1vel.<\/p>\n<p>O a\u00e7o 690 cont\u00e9m 60% de n\u00edquel e \u00e9 utilizado principalmente na tubula\u00e7\u00e3o de geradores de vapor em usinas nucleares. A temperatura de opera\u00e7\u00e3o \u00e9 de 365\u00b0C, onde a fissura de corros\u00e3o estressante entre os gr\u00e3os \u00e9 um problema potencial. Nas condi\u00e7\u00f5es de servi\u00e7o adequadas, o a\u00e7o 690 \u00e9 praticamente livre de corros\u00e3o, tornando-o a op\u00e7\u00e3o preferida.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter  wp-image-2169\" src=\"https:\/\/wldstainless.com\/wp-content\/uploads\/2021\/07\/Sweden-over-the-rainbow.jpg\" alt=\"\" width=\"421\" height=\"561\" srcset=\"https:\/\/wldstainless.com\/wp-content\/uploads\/2021\/07\/Sweden-over-the-rainbow.jpg 480w, https:\/\/wldstainless.com\/wp-content\/uploads\/2021\/07\/Sweden-over-the-rainbow-225x300.jpg 225w, https:\/\/wldstainless.com\/wp-content\/uploads\/2021\/07\/Sweden-over-the-rainbow-450x600.jpg 450w\" sizes=\"auto, (max-width: 421px) 100vw, 421px\" \/><\/p>\n<p>\u00c9 interessante observar que o a\u00e7o inoxid\u00e1vel austen\u00edtico rico em n\u00edquel 254SMO tamb\u00e9m \u00e9 utilizado na arte. A escultura \u201cGod, Over the Rainbow\u201d, de Carl Milles, foi instalada em 1995 na costa sul do Nak Strand, em Estocolmo. A escultura tem cerca de 23 metros de altura e \u00e9 um local tur\u00edstico famoso onde um grande n\u00famero de marinheiros passa por l\u00e1 todos os dias. A \u00e1gua do mar circundante cont\u00e9m sal; o cloreto \u00e9 muito f\u00e1cil de causar corros\u00e3o superficial; o a\u00e7o inoxid\u00e1vel super austen\u00edtico de alta resist\u00eancia 254SMO \u00e9 muito adequado para este ambiente.<\/p>","protected":false},"excerpt":{"rendered":"<p>Nickel is known to be an expensive alloying element and is essential in some applications where both stress corrosion resistance and austenite structure are required. For example, creep resistance is important in high temperature environments, where austenitic stainless steels are needed. Similar to the traditional austenitic stainless steels, the twin boundary is a significant feature [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2171,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2167","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-social-activities"],"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 steels 254SMO and 654SMO are designed specifically for the oil and gas industry. 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