{"id":165,"date":"2018-01-03T09:47:15","date_gmt":"2018-01-03T06:47:15","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=165"},"modified":"2020-11-02T12:00:49","modified_gmt":"2020-11-02T09:00:49","slug":"stal","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/pt\/aco\/","title":{"rendered":"A\u00e7o: propriedades, marca\u00e7\u00f5es, normas GOST e tipos de a\u00e7o"},"content":{"rendered":"<p>O a\u00e7o, como um dos metais mais comuns, recebeu a aplica\u00e7\u00e3o mais ampla hoje. Processamento e <a href=\"https:\/\/metallsmaster.pro\/pt\/todos-os-tipos-de-corte-de-metal\/\">corte<\/a> Este material \u00e9 uma tarefa que pode ser resolvida usando uma grande variedade de ferramentas e tecnologias. <strong>Propriedades do a\u00e7o <\/strong>permitir processamento preciso e de alta velocidade usando os seguintes tipos de processamento:<\/p>\n<ul>\n<li><a href=\"https:\/\/metallsmaster.pro\/pt\/gilotina-po-metallu\/\">corte mec\u00e2nico<\/a>;<\/li>\n<li>jato de \u00e1gua;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/pt\/soldagem-a-arco-de-argonio\/\">arco de arg\u00f4nio<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/pt\/soldagem-a-arco-eletrico-de-metal\/\">arco el\u00e9trico<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/pt\/equipamento-de-corte-de-gas\/\">g\u00e1s<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/pt\/corte-a-arco-de-plasma\/\">plasma<\/a>;<\/li>\n<li><a href=\"https:\/\/metallsmaster.pro\/pt\/corte-a-laser\/\">laser<\/a>.<\/li>\n<\/ul>\n<p>Dependendo de <strong>graus de a\u00e7o<\/strong> e os resultados desejados, utilize a tecnologia de processamento de metal mais apropriada.<\/p>\n<h2>Propriedades do a\u00e7o<\/h2>\n<p>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<br \/>\nExistem 4 \u00e1reas principais de indicadores que distinguem o a\u00e7o e suas ligas.<\/p>\n<p>Entre essas \u00e1reas:<\/p>\n<ul>\n<li>propriedades qu\u00edmicas do a\u00e7o;<\/li>\n<li>tecnol\u00f3gica;<\/li>\n<li>propriedades mec\u00e2nicas do a\u00e7o;<\/li>\n<li>propriedades magn\u00e9ticas do a\u00e7o.<\/li>\n<\/ul>\n<p>Agora vamos falar sobre cada um deles com mais detalhes.<\/p>\n<h3>Propriedades qu\u00edmicas do a\u00e7o<\/h3>\n<ul>\n<li><strong>Oxidabilidade.<\/strong>\u00a0Esta \u00e9 uma medida da capacidade de se combinar com o oxig\u00eanio. A oxida\u00e7\u00e3o aumenta com o aumento da temperatura do metal. A\u00e7os de baixo carbono oxidam e formam ferrugem (\u00f3xidos de ferro) quando expostos \u00e0 \u00e1gua ou ao ar \u00famido;<\/li>\n<li><strong>Resist\u00eancia \u00e0 corros\u00e3o.\u00a0<\/strong>Portanto, isso significa que a subst\u00e2ncia n\u00e3o sofre rea\u00e7\u00f5es qu\u00edmicas e n\u00e3o oxida. No entanto, \u00e9 importante observar que essa propriedade n\u00e3o \u00e9 encontrada em todas as ligas de a\u00e7o e \u00e9 mais caracter\u00edstica de graus excepcionais;<\/li>\n<li><strong>Resist\u00eancia ao calor.<\/strong>\u00a0A resist\u00eancia ao calor caracteriza a capacidade de um material de n\u00e3o oxidar sob a influ\u00eancia de altas temperaturas e n\u00e3o formar incrusta\u00e7\u00f5es;<\/li>\n<li><strong>Resist\u00eancia ao calor.<\/strong>\u00a0A resist\u00eancia ao calor determina a capacidade de uma liga de manter sua resist\u00eancia em altas temperaturas. Isso permite que o a\u00e7o seja utilizado na cria\u00e7\u00e3o de componentes e mecanismos sujeitos a estresse t\u00e9rmico.<\/li>\n<\/ul>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Propriedades tecnol\u00f3gicas do a\u00e7o<\/h3>\n<p>As propriedades tecnol\u00f3gicas do a\u00e7o refletem a capacidade de um metal ou liga de passar por diversos tipos de processamento. Entre elas:<\/p>\n<ul>\n<li>Usinabilidade. Todos os a\u00e7os s\u00e3o f\u00e1ceis de usinar, tanto manualmente (com serra, cinzel ou lima) quanto em m\u00e1quinas-ferramentas (fura\u00e7\u00e3o, torneamento ou fresamento).<\/li>\n<li>Maleabilidade. Esta propriedade \u00e9 levada em considera\u00e7\u00e3o durante a lamina\u00e7\u00e3o, o forjamento e a estampagem. O a\u00e7o apresenta uma maleabilidade bastante boa quando aquecido.<\/li>\n<li>Soldabilidade. Este processo \u00e9 aplic\u00e1vel a todos os tipos de a\u00e7o.<\/li>\n<li>Fluidez. Esta propriedade \u00e9 essencial para a produ\u00e7\u00e3o de produtos semiacabados \u2014 pe\u00e7as fundidas que se assemelham a pe\u00e7as acabadas e requerem apenas uma pequena usinagem adicional.<\/li>\n<li>Temperabilidade. A temperabilidade depende do tamanho das pe\u00e7as e produtos, bem como da composi\u00e7\u00e3o qu\u00edmica do a\u00e7o. Para aumentar a temperabilidade, componentes de liga como cromo e tungst\u00eanio s\u00e3o adicionados ao a\u00e7o.<\/li>\n<li>Resist\u00eancia ao desgaste. Para aumentar a resist\u00eancia ao desgaste, as pe\u00e7as de atrito (dentes da engrenagem) s\u00e3o submetidas a tratamento t\u00e9rmico (endurecimento) e tratamento qu\u00edmico-t\u00e9rmico (cementa\u00e7\u00e3o, nitreta\u00e7\u00e3o). Elementos de liga como mangan\u00eas e sil\u00edcio s\u00e3o adicionados ao a\u00e7o para o mesmo prop\u00f3sito.<\/li>\n<li>Resist\u00eancia \u00e0 corros\u00e3o. Para aumentar essa resist\u00eancia, n\u00edquel, cromo e tit\u00e2nio s\u00e3o adicionados ao a\u00e7o, produzindo os chamados a\u00e7os inoxid\u00e1veis.<\/li>\n<\/ul>\n<h3>Propriedades mec\u00e2nicas do a\u00e7o<\/h3>\n<ul>\n<li><strong>For\u00e7a.<\/strong>\u00a0Capacidade de um metal de suportar cargas externas significativas. Essa propriedade \u00e9 caracterizada por seu limite de escoamento e resist\u00eancia \u00e0 tra\u00e7\u00e3o.\n<ul>\n<li><strong>Resist\u00eancia \u00e0 trac\u00e7\u00e3o.<\/strong>\u00a0A tens\u00e3o mec\u00e2nica m\u00e1xima acima da qual o a\u00e7o falha.<\/li>\n<li><strong>Limite de escoamento.<\/strong>\u00a0Este par\u00e2metro mostra a tens\u00e3o mec\u00e2nica acima da qual o material continua a se alongar sob condi\u00e7\u00f5es sem carga.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Pl\u00e1stico.<\/strong>\u00a0Capacidade de mudar de forma sob carga e mant\u00ea-la quando descarregada. \u00c9 quantificada pelo alongamento relativo e \u00e2ngulo de flex\u00e3o;<\/li>\n<li><strong>Resist\u00eancia ao impacto.<\/strong>\u00a0Capacidade de um metal de resistir a cargas din\u00e2micas. Essa caracter\u00edstica \u00e9 avaliada quantitativamente pelo trabalho necess\u00e1rio para fraturar o corpo de prova, dividido pela sua \u00e1rea de se\u00e7\u00e3o transversal;<\/li>\n<li><strong>Dureza.<\/strong>\u00a0Capacidade de resistir ao impacto de objetos s\u00f3lidos. Caracterizada quantitativamente pela carga por \u00e1rea da indenta\u00e7\u00e3o quando pressionada com uma pir\u00e2mide de diamante (m\u00e9todo Vickers) ou uma esfera de a\u00e7o (m\u00e9todo Brinell).<\/li>\n<\/ul>\n<h3>Propriedades magn\u00e9ticas do a\u00e7o<\/h3>\n<p>Como se sabe, quase todos os a\u00e7os (exceto alguns a\u00e7os inoxid\u00e1veis) s\u00e3o magn\u00e9ticos.<\/p>\n<blockquote><p>Vale dizer desde j\u00e1 que o a\u00e7o inoxid\u00e1vel \u00e9, na verdade, magn\u00e9tico.<\/p><\/blockquote>\n<p>Nem todo a\u00e7o inoxid\u00e1vel \u00e9 magn\u00e9tico, mas ainda assim \u00e9. N\u00e3o h\u00e1 uma afirma\u00e7\u00e3o definitiva, pois as propriedades magn\u00e9ticas das ligas s\u00e3o determinadas pelas propriedades de seus componentes estruturais. Portanto, um tipo de a\u00e7o inoxid\u00e1vel pode atrair um \u00edm\u00e3 com sucesso, enquanto outro \u00e9 completamente indiferente. Ent\u00e3o, como isso funciona?<\/p>\n<p>\u00c9 tudo uma quest\u00e3o de composi\u00e7\u00e3o estrutural.<\/p>\n<p class=\"font_8\">A martensita, do ponto de vista das propriedades magn\u00e9ticas, \u00e9 um ferromagneto puro.<\/p>\n<p class=\"font_8\">A ferrita pode apresentar duas modifica\u00e7\u00f5es. Em temperaturas abaixo do ponto de Curie, ela, assim como a martensita, \u00e9 ferromagn\u00e9tica. A ferrita delta em altas temperaturas \u00e9 paramagn\u00e9tica.<\/p>\n<p class=\"font_8\">Assim, a\u00e7os resistentes \u00e0 corros\u00e3o cuja estrutura consiste em martensita s\u00e3o a\u00e7os inoxid\u00e1veis magn\u00e9ticos. Essas ligas reagem a um \u00edm\u00e3 como o a\u00e7o carbono comum. A\u00e7os ferr\u00edticos ou ferr\u00edtico-martens\u00edticos podem ter propriedades diferentes dependendo da propor\u00e7\u00e3o de seus componentes de fase, mas s\u00e3o mais frequentemente ferromagn\u00e9ticos.<\/p>\n<p>Como resultado, o cromo e algumas ligas de a\u00e7o inoxid\u00e1vel de cromo-n\u00edquel s\u00e3o consideradas magn\u00e9ticas.<\/p>\n<p>Ligas n\u00e3o magn\u00e9ticas incluem a\u00e7os de cromo-n\u00edquel e cromo-mangan\u00eas-n\u00edquel.<\/p>\n<p>\u00c9 muito f\u00e1cil determinar se o a\u00e7o com o qual voc\u00ea est\u00e1 lidando \u00e9 a\u00e7o inoxid\u00e1vel genu\u00edno. Limpe a superf\u00edcie at\u00e9 que brilhe e, em seguida, aplique e esfregue duas ou tr\u00eas gotas de uma solu\u00e7\u00e3o concentrada de sulfato de cobre. Se o revestimento de cobre aparecer (o sulfato se transforma em um revestimento de cobre), n\u00e3o \u00e9 a\u00e7o inoxid\u00e1vel. Se n\u00e3o houver altera\u00e7\u00e3o ou impacto, voc\u00ea est\u00e1 lidando com a\u00e7o inoxid\u00e1vel genu\u00edno.<\/p>\n<blockquote><p>\u00c9 importante observar que \u00e9 imposs\u00edvel determinar em casa se o a\u00e7o inoxid\u00e1vel \u00e9 de qualidade alimentar.<\/p><\/blockquote>\n<p>Portanto, voc\u00ea n\u00e3o deve usar metais n\u00e3o testados em utens\u00edlios de cozinha.<\/p>\n<h4>Um pouco mais sobre as propriedades dos a\u00e7os<\/h4>\n<p>O uso generalizado do metal se deve a uma s\u00e9rie de caracter\u00edsticas vantajosas. Entre elas, destacam-se: <strong>propriedades do a\u00e7o:<\/strong><\/p>\n<ul>\n<li>Capacidade t\u00e9rmica espec\u00edfica a 20 \u00b0C: 462 J\/(kg \u00b0C) (110 cal\/(kg \u00b0C));<\/li>\n<li>Densidade: 7700-7900 kg\/m\u00b3;<\/li>\n<li>Ponto de fus\u00e3o: 1450-1520 \u00b0C;<\/li>\n<li>Gravidade espec\u00edfica: 75500-77500 N\/m\u00b3 (7700-7900 kgf\/m\u00b3 no sistema MKGSS);<\/li>\n<li>Calor espec\u00edfico de fus\u00e3o: 84 kJ\/kg (20 kcal\/kg, 23 W h\/kg);<\/li>\n<li>O coeficiente de condutividade t\u00e9rmica varia dependendo do tipo de a\u00e7o e das impurezas em sua composi\u00e7\u00e3o e pode variar de 15,5 W\/(m K) a 54,4 W\/(m K);<\/li>\n<li>O coeficiente de expans\u00e3o linear t\u00e9rmica est\u00e1 dentro da faixa de 11,9 \u00b7 10<sup>-6 <\/sup>1\/<sup>0<\/sup>De 11,0 a 10<sup>-6 <\/sup>1\/<sup>0<\/sup>C e depende da marca e dos componentes adicionais da liga.<\/li>\n<\/ul>\n<p>A resist\u00eancia \u00e0 tra\u00e7\u00e3o \u00e9 determinada para cada tipo de a\u00e7o separadamente e possui os seguintes indicadores, dados abaixo:<\/p>\n<ul>\n<li>Estrutural 373-412 MPa;<\/li>\n<li>Sil\u00edcio-cromo-mangan\u00eas, utilizado na produ\u00e7\u00e3o de ferramentas 1,52 GPa;<\/li>\n<li>Engenharia de carbono 314-785 MPa;<\/li>\n<li>Ferrovia 690-785 MPa.<\/li>\n<\/ul>\n<p>As propriedades do material tamb\u00e9m variam em fun\u00e7\u00e3o do teor de carbono. Existem as seguintes <strong>tipos de a\u00e7o<\/strong>:<\/p>\n<ul>\n<li>baixo carbono (menos de 0,25% de carbono);<\/li>\n<li>carbono m\u00e9dio (0,3 \u2013 0,55% carbono);<\/li>\n<li>alto teor de carbono (0,6 \u2013 2% carbono).<\/li>\n<\/ul>\n<p>Para aumentar a usabilidade do a\u00e7o, \u00e9 realizada a liga \u2014 a adi\u00e7\u00e3o de metais ao a\u00e7o fundido altera as propriedades da liga (aumentando a resist\u00eancia mec\u00e2nica, a condutividade el\u00e9trica, a resist\u00eancia \u00e0 corros\u00e3o e a condutividade magn\u00e9tica e t\u00e9rmica). Molibd\u00eanio, alum\u00ednio, cromo, n\u00edquel e v\u00e1rios outros s\u00e3o usados como metais de liga. Destacam-se: <strong>tipos de a\u00e7o<\/strong> ligado:<\/p>\n<ul>\n<li>Baixa liga \u2013 inclus\u00f5es de metais de liga n\u00e3o superiores a 4%;<\/li>\n<li>Metais de liga m\u00e9dia \u2013 n\u00e3o constituem mais do que inclus\u00f5es de 11%;<\/li>\n<li>Alta liga \u2013 mais de 11%.<\/li>\n<\/ul>\n<h3>Graus de a\u00e7o<\/h3>\n<p><strong>Marca\u00e7\u00e3o de a\u00e7o de acordo com GOST<\/strong> \u00e9 produzido por designa\u00e7\u00e3o de letras. Gra\u00e7as \u00e0 ordem das regras de designa\u00e7\u00e3o, \u00e9 poss\u00edvel conhecer e ler <strong>marca\u00e7\u00f5es de a\u00e7o <\/strong>N\u00e3o \u00e9 uma tarefa dif\u00edcil com tais designa\u00e7\u00f5es. Existem v\u00e1rias designa\u00e7\u00f5es estabelecidas que s\u00e3o usadas <strong>marca\u00e7\u00e3o<\/strong> <strong>a\u00e7o<\/strong> <strong>Por<\/strong> <strong>GOST<\/strong>:<\/p>\n<ul>\n<li>H \u2013 n\u00edquel;<\/li>\n<li>M \u2013 molibd\u00eanio;<\/li>\n<li>T \u2013 tit\u00e2nio;<\/li>\n<li>X \u2013 cromado;<\/li>\n<li>K \u2013 cobalto;<\/li>\n<li>B \u2013 tungst\u00eanio;<\/li>\n<li>T \u2013 tit\u00e2nio;<\/li>\n<li>D \u2013 cobre;<\/li>\n<li>G \u2013 mangan\u00eas;<\/li>\n<li>C \u2013 sil\u00edcio;<\/li>\n<li>F \u2013 van\u00e1dio;<\/li>\n<li>R \u2013 boro;<\/li>\n<li>A \u2013 nitrog\u00eanio;<\/li>\n<li>B \u2013 ni\u00f3bio;<\/li>\n<li>E \u2013 sel\u00eanio;<\/li>\n<li>C \u2013 zirc\u00f4nio;<\/li>\n<li>U \u2013 alum\u00ednio;<\/li>\n<li>\u0427 \u2013 significa a presen\u00e7a de metais de terras raras.<\/li>\n<\/ul>\n<p>Para designar diferentes tipos dependendo da composi\u00e7\u00e3o e finalidade do a\u00e7o, s\u00e3o utilizadas as seguintes s\u00e9ries de designa\u00e7\u00f5es de letras:<\/p>\n<ul>\n<li>PS \u2013 semi-calmo;<\/li>\n<li>KP \u2013 ebuli\u00e7\u00e3o;<\/li>\n<li>SP \u2013 calma.<\/li>\n<\/ul>\n<p>Dessa forma, ao observar as designa\u00e7\u00f5es mencionadas na marca\u00e7\u00e3o da liga, podemos determinar sua composi\u00e7\u00e3o e entender que tipo de material temos diante de n\u00f3s.<\/p>\n<p>Uma boa ajuda seria a mesa de marca\u00e7\u00e3o de a\u00e7o<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1278 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/\u0442\u0430\u0431\u043b\u0438\u0446\u0430-\u043c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0438-\u0441\u0442\u0430\u043b\u0438.png\" alt=\"\" width=\"295\" height=\"171\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/\u0442\u0430\u0431\u043b\u0438\u0446\u0430-\u043c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0438-\u0441\u0442\u0430\u043b\u0438.png 295w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/\u0442\u0430\u0431\u043b\u0438\u0446\u0430-\u043c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0438-\u0441\u0442\u0430\u043b\u0438-254x147.png 254w\" sizes=\"auto, (max-width: 295px) 100vw, 295px\" \/><strong><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-168 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main.webp\" alt=\"aplica\u00e7\u00e3o de a\u00e7o\" width=\"660\" height=\"325\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main.webp 660w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main-300x148.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/20_main-254x125.webp 254w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/strong><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>O a\u00e7o, como um dos metais mais comuns, recebeu a aplica\u00e7\u00e3o mais ampla 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