{"id":17053,"date":"2021-12-09T14:22:55","date_gmt":"2021-12-09T14:22:55","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=17053"},"modified":"2025-07-01T06:23:43","modified_gmt":"2025-07-01T06:23:43","slug":"composicao-de-aco-inoxidavel","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/composicao-de-aco-inoxidavel\/","title":{"rendered":"Composi\u00e7\u00e3o em A\u00e7o Inoxid\u00e1vel"},"content":{"rendered":"
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Composi\u00e7\u00e3o em A\u00e7o Inoxid\u00e1vel<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Como voc\u00ea sabe, os materiais de a\u00e7o inoxid\u00e1vel s\u00e3o compostos de v\u00e1rios elementos met\u00e1licos e n\u00e3o met\u00e1licos - claro, estamos falando aqui de a\u00e7o inoxid\u00e1vel austen\u00edtico. Portanto, hoje vamos apresentar brevemente a composi\u00e7\u00e3o em a\u00e7o inoxid\u00e1vel e o desempenho de cada elemento.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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a) Cr\u00f3mio - Elemento B\u00e1sico em A\u00e7o Inoxid\u00e1vel<\/strong><\/h3>

O cromo \u00e9 o elemento mais b\u00e1sico para determinar a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel. No meio oxidante, o cromo pode formar uma pel\u00edcula de oxida\u00e7\u00e3o insol\u00favel e rica em cromo para evitar a passagem do meio corrosivo. Este filme \u00e9 muito denso, e \u00e9 firmemente combinado com o metal, de modo que protege o a\u00e7o contra a oxida\u00e7\u00e3o posterior pelo meio externo. Al\u00e9m disso, o cromo tamb\u00e9m pode ajudar a aumentar o potencial do eletrodo de a\u00e7o. Quando os \u00e1tomos no cromo excedem 12,5%, o potencial do eletrodo de a\u00e7o pode ser mudado de potencial negativo para positivo. Portanto, a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o pode ser significativamente melhorada. Se houver mais conte\u00fado de cromo, melhor resist\u00eancia \u00e0 corros\u00e3o o a\u00e7o ser\u00e1. Quando os \u00e1tomos com conte\u00fado de cromo alcan\u00e7arem 25% e 37,5%, a segunda e terceira muta\u00e7\u00f5es vir\u00e3o, fazendo com que o a\u00e7o tenha maior resist\u00eancia \u00e0 corros\u00e3o.<\/p>

b) N\u00edquel - N\u00e3o pode formar a\u00e7o inoxid\u00e1vel por si s\u00f3<\/strong><\/h3>

O n\u00edquel tem influ\u00eancia sobre a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel, mas sua efic\u00e1cia s\u00f3 pode ser plenamente alcan\u00e7ada com o cromo. Se o a\u00e7o de n\u00edquel de baixo carbono requer uma estrutura de austenita pura, seu conte\u00fado de n\u00edquel precisa atingir 24%. Ou se houver necessidade de alterar a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o em alguns meios, o teor de n\u00edquel deve exceder 27%. Portanto, o n\u00edquel n\u00e3o pode formar a\u00e7o inoxid\u00e1vel por si s\u00f3. Entretanto, sob temperatura normal, quando o n\u00edquel 9% \u00e9 misturado ao a\u00e7o cromo 18%, o a\u00e7o pode obter uma \u00fanica estrutura de austenita, que pode melhorar a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o ao meio n\u00e3o oxidante (como dilu\u00eddo, \u00e1cido fosf\u00f3rico, etc.), e pode melhorar o desempenho do a\u00e7o no processo de soldagem e dobra a frio.<\/p>

\u00a0<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Composi\u00e7\u00e3o\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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c) Mangan\u00eas e Nitrog\u00eanio - Substitui\u00e7\u00e3o do N\u00edquel<\/strong><\/h3>

Em compara\u00e7\u00e3o com o n\u00edquel, o mangan\u00eas e o nitrog\u00eanio desempenham fun\u00e7\u00e3o similar no a\u00e7o inoxid\u00e1vel. Para o mangan\u00eas, ele tem apenas metade da efic\u00e1cia do n\u00edquel. Quanto ao nitrog\u00eanio, sua efic\u00e1cia \u00e9 40 vezes melhor que a do n\u00edquel. Portanto, o mangan\u00eas e o nitrog\u00eanio podem ser utilizados para substituir o n\u00edquel na estrutura \u00fanica da austenita. Entretanto, a resist\u00eancia \u00e0 corros\u00e3o ser\u00e1 reduzida se for adicionado mangan\u00eas em a\u00e7o inoxid\u00e1vel com baixo teor de cromo. Al\u00e9m disso, o a\u00e7o austen\u00edtico com \u00e9 dif\u00edcil de processar. Portanto, o n\u00edquel n\u00e3o ser\u00e1 totalmente substitu\u00eddo por mangan\u00eas em a\u00e7o inoxid\u00e1vel.<\/p>

d) Molibd\u00eanio e Cobre - Melhoria da Resist\u00eancia \u00e0 Corros\u00e3o para A\u00e7o Inoxid\u00e1vel<\/strong><\/h3>

Molibd\u00eanio<\/a> e o cobre podem melhorar a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o inoxid\u00e1vel em alguns meios corrosivos, como o \u00e1cido ac\u00e9tico. No caso do molibd\u00eanio, ele tamb\u00e9m pode melhorar significativamente a resist\u00eancia \u00e0 corros\u00e3o de meios que cont\u00eam cloreto, como \u00e1cidos org\u00e2nicos. No entanto, o a\u00e7o inoxid\u00e1vel que cont\u00e9m molibd\u00eanio n\u00e3o pode ser aplicado ao \u00e1cido n\u00edtrico, pois a velocidade de corros\u00e3o do a\u00e7o inoxid\u00e1vel que cont\u00e9m molibd\u00eanio ser\u00e1 duplicada se colocado em \u00e1cido n\u00edtrico 65% em ebuli\u00e7\u00e3o. Al\u00e9m disso, se for adicionado cobre ao a\u00e7o inoxid\u00e1vel Cr-Mn, o corros\u00e3o intergranular<\/a> do a\u00e7o inoxid\u00e1vel ser\u00e1 acelerada.<\/p>

O molibd\u00eanio tem um efeito adverso sobre uma \u00fanica estrutura de austenita em a\u00e7o. Portanto, para que o a\u00e7o contendo molibd\u00eanio tenha uma \u00fanica estrutura de austenita ap\u00f3s tratamento t\u00e9rmico, o conte\u00fado de n\u00edquel no mangan\u00eas e outros elementos deve ser aumentado de acordo.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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e) Sil\u00edcio e Alum\u00ednio - Melhoria da Resist\u00eancia \u00e0 Oxida\u00e7\u00e3o do A\u00e7o Inoxid\u00e1vel<\/strong><\/h3>

O sil\u00edcio pode melhorar significativamente a resist\u00eancia \u00e0 oxida\u00e7\u00e3o do a\u00e7o cromo. Para o a\u00e7o com cromo 5% e sil\u00edcio 1%, sua resist\u00eancia \u00e0 oxida\u00e7\u00e3o \u00e9 igual a 12% de a\u00e7o cromo. Se for necess\u00e1rio que o a\u00e7o seja resistente \u00e0 oxida\u00e7\u00e3o em 1000\u2103, deve ser adicionado 22% cromo para o a\u00e7o com sil\u00edcio 0,5%. Entretanto, se o teor de sil\u00edcio atingir 2,5% a 3%, s\u00f3 ser\u00e1 necess\u00e1rio 12% de cromo. Os dados tamb\u00e9m mostram que a adi\u00e7\u00e3o de sil\u00edcio 2,5% ao a\u00e7o cromo-n\u00edquel Cr15Ni20, sua resist\u00eancia \u00e0 oxida\u00e7\u00e3o \u00e9 equivalente \u00e0 liga de cromo-n\u00edquel Cr15Ni60.<\/p>

Al\u00e9m disso, a adi\u00e7\u00e3o de alum\u00ednio a a\u00e7os de alto cromo tamb\u00e9m melhorar\u00e1 a resist\u00eancia \u00e0 oxida\u00e7\u00e3o. A fun\u00e7\u00e3o do alum\u00ednio \u00e9 como o sil\u00edcio.<\/p>

O objetivo de adicionar sil\u00edcio e alum\u00ednio ao a\u00e7o de alto cromo \u00e9 melhorar ainda mais a resist\u00eancia \u00e0 oxida\u00e7\u00e3o do a\u00e7o e economizar o cromo. Adicionar sil\u00edcio e alum\u00ednio pode ajudar muito na resist\u00eancia \u00e0 oxida\u00e7\u00e3o, mas tamb\u00e9m tem muitas desvantagens. A mais importante \u00e9 que ela aumentar\u00e1 a tend\u00eancia de gr\u00e3os grosseiros e quebradi\u00e7os.<\/p>

f) Tungst\u00eanio e Vanadium<\/strong><\/h3>

A adi\u00e7\u00e3o de Tungst\u00eanio e van\u00e1dio ao a\u00e7o ajuda principalmente na melhoria da resist\u00eancia t\u00e9rmica do a\u00e7o.<\/p>

g) Boro<\/strong><\/h3>

A adi\u00e7\u00e3o de boro 0,005% ao a\u00e7o inoxid\u00e1vel ferr\u00edtico de alto cromo (Cr17Mo2Ti) melhorar\u00e1 a resist\u00eancia \u00e0 corros\u00e3o do a\u00e7o em \u00e1cido ac\u00e9tico 65% fervente. E se for adicionado um tra\u00e7o de boro (cerca de 0,0006 ~ 0,0007%), a ductilidade a quente dos a\u00e7os inoxid\u00e1veis austen\u00edticos ser\u00e1 melhorada. O boro tem um bom efeito na melhoria da resist\u00eancia t\u00e9rmica do a\u00e7o inoxid\u00e1vel, o que pode melhorar significativamente a resist\u00eancia t\u00e9rmica do a\u00e7o inoxid\u00e1vel. Al\u00e9m disso, os a\u00e7os inoxid\u00e1veis Cr-Ni austen\u00edticos contendo boro tamb\u00e9m t\u00eam aplica\u00e7\u00f5es especiais na ind\u00fastria de energia at\u00f4mica.<\/p>

No entanto, a adi\u00e7\u00e3o de boro em a\u00e7o inoxid\u00e1vel reduzir\u00e1 a plasticidade e a tenacidade de impacto do a\u00e7o.<\/p>

h) Outros<\/strong><\/h3>

Al\u00e9m dos elementos listados acima, adicionar alguns elementos de metal raros ou elementos de terras raras tamb\u00e9m melhorar\u00e1 o desempenho de tubos e acess\u00f3rios de a\u00e7o inoxid\u00e1vel<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\tLinkedIn\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"featured_media":17055,"template":"","categories":[85],"tags":[],"class_list":["post-17053","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-news"],"yoast_head":"\nStainless Steel Composition - KAYSUNS<\/title>\n<meta name=\"description\" content=\"Stainless steel is composed of elements, we will briefly introduce stainless steel composition and the performance of each element.\" \/>\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\/composicao-de-aco-inoxidavel\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stainless Steel Composition - 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