{"id":552,"date":"2019-02-01T12:36:16","date_gmt":"2019-02-01T09:36:16","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=552"},"modified":"2020-11-02T11:42:52","modified_gmt":"2020-11-02T08:42:52","slug":"sredneuglerodistaya-stal","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/pt\/aco-carbono-medio\/","title":{"rendered":"A\u00e7os de m\u00e9dio carbono: graus, propriedades e caracter\u00edsticas da liga"},"content":{"rendered":"<p>A\u00e7o de m\u00e9dio carbono \u00e9 um a\u00e7o que n\u00e3o cont\u00e9m elementos de liga e possui 0,25-0,6% de carbono e impurezas constantes. Esta liga \u00e9 classificada como um a\u00e7o de qualidade padr\u00e3o, fundido em fornos de oxig\u00eanio b\u00e1sico, e \u00e9 considerada barata devido aos seus custos de produ\u00e7\u00e3o relativamente baixos. Suas propriedades mec\u00e2nicas s\u00e3o significativamente inferiores \u00e0s de outras ligas.<\/p>\n<p>Este tipo de a\u00e7o tamb\u00e9m \u00e9 considerado um a\u00e7o endurec\u00edvel, o que significa que requer tratamento t\u00e9rmico adicional, incluindo t\u00eampera e revenimento em alta temperatura. O a\u00e7o de m\u00e9dio carbono pode ser ligado, o que lhe confere propriedades mec\u00e2nicas \u00fanicas. A adi\u00e7\u00e3o de mangan\u00eas aumenta a resist\u00eancia do a\u00e7o e confere-lhe altas propriedades el\u00e1sticas; essas propriedades s\u00e3o adquiridas ap\u00f3s t\u00eampera, revenimento e, \u00e0s vezes, normaliza\u00e7\u00e3o. A adi\u00e7\u00e3o de cromo e n\u00edquel aumenta a resist\u00eancia, a tenacidade e outras propriedades de processamento. Ligas desta classe apresentam temperabilidade profunda.<\/p>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>O a\u00e7o de m\u00e9dio carbono e baixa liga \u00e9 utilizado na engenharia mec\u00e2nica ap\u00f3s tratamento t\u00e9rmico, t\u00eampera e revenimento. Alguns tipos tamb\u00e9m s\u00e3o revenidos e normalizados. Isso permite a fabrica\u00e7\u00e3o de pe\u00e7as que operam sob condi\u00e7\u00f5es de atrito relativamente alto, com altas vibra\u00e7\u00f5es e cargas est\u00e1ticas. O a\u00e7o estrutural de m\u00e9dio carbono \u00e9 utilizado com sucesso em pe\u00e7as de m\u00e1quinas, mas requer maior refinamento. \u00c9 utilizado na fabrica\u00e7\u00e3o de embreagens de freio de funcionamento a seco e pe\u00e7as sujeitas a altas cargas de atrito.<\/p>\n<p>Como esta liga mant\u00e9m alta dureza e excelentes propriedades de corte por muito tempo, ela \u00e9 utilizada na fabrica\u00e7\u00e3o de ferramentas de corte. O teor de sil\u00edcio aumenta a resist\u00eancia ao mesmo tempo em que reduz a tenacidade, resultando em menor temperabilidade das pe\u00e7as. Este tipo de liga \u00e9 utilizado na fabrica\u00e7\u00e3o de molas. A presen\u00e7a de cromo e mangan\u00eas no a\u00e7o de m\u00e9dio carbono tamb\u00e9m aumenta a resist\u00eancia mec\u00e2nica e ao desgaste. O metal \u00e9 sold\u00e1vel, tornando-o adequado para a cria\u00e7\u00e3o de estruturas ou componentes soldados dur\u00e1veis.<\/p>\n<h2>Graus de a\u00e7o de m\u00e9dio carbono<\/h2>\n<blockquote><p>Os graus de a\u00e7o de m\u00e9dio carbono s\u00e3o regulamentados pelos GOSTs: GOST 1050-75, GOST 380-71.<\/p><\/blockquote>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>De acordo com os padr\u00f5es estabelecidos, todas as ligas s\u00e3o divididas em grupos:<\/p>\n<ul>\n<li>A - fornecido de acordo com as propriedades mec\u00e2nicas;<\/li>\n<li>B - por composi\u00e7\u00e3o qu\u00edmica;<\/li>\n<li>B \u2013 de acordo com as propriedades mec\u00e2nicas, mas levando em considera\u00e7\u00e3o os requisitos individuais de composi\u00e7\u00e3o qu\u00edmica.<\/li>\n<\/ul>\n<p>Os a\u00e7os de m\u00e9dio carbono do grupo A t\u00eam os seguintes nomes:<\/p>\n<ul>\n<li>Arte. 0;<\/li>\n<li>Arte. 1;<\/li>\n<li>Arte. 2;<\/li>\n<li>Arte. 3;<\/li>\n<li>Arte. 4\u00ba;<\/li>\n<li>Arte. 5\u00ba;<\/li>\n<li>Arte. 6\u00ba;<\/li>\n<li>Arte. 7.<\/li>\n<\/ul>\n<p>Se a liga estiver em ebuli\u00e7\u00e3o, a abreviatura \u201ckp\u201d \u00e9 indicada, semi-morta \u2013 \u201cps\u201d, na aus\u00eancia de uma abreviatura deve-se presumir que o a\u00e7o est\u00e1 morto.<\/p>\n<blockquote><p>Os a\u00e7os de m\u00e9dio carbono do grupo B s\u00e3o produzidos usando m\u00e9todos de conversor, Bessemer e forno aberto.<\/p><\/blockquote>\n<p>Na marca\u00e7\u00e3o, o m\u00e9todo de produ\u00e7\u00e3o \u00e9 indicado por uma abrevia\u00e7\u00e3o de letra:<\/p>\n<ul>\n<li>&quot;M&quot; - lareira aberta;<\/li>\n<li>&quot;B&quot; Bessemer;<\/li>\n<li>Envelope &quot;K&quot;.<\/li>\n<\/ul>\n<p>Para o grupo de a\u00e7o Bessemer B, \u00e9 comum produzir apenas os seguintes graus: BSt. O, BSt. 3, BSt. 4, BSt. 5, BSt. 6.<\/p>\n<p>Os a\u00e7os de m\u00e9dio carbono do grupo B s\u00e3o produzidos pelos processos de convers\u00e3o e forno aberto. Os seguintes graus s\u00e3o aceitos para a\u00e7os de forno aberto do grupo B: VMSt. 2, VMSt. 3, VMSt. 4, VMSt. 5. Para a\u00e7os de convers\u00e3o do grupo B, os mesmos graus s\u00e3o designados pela letra &quot;K&quot; (VKSt. 2, VKSt. 3).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-553 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0440\u0435\u0434\u043d\u0435\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f-\u0441\u0442\u0430\u043b\u044c.webp\" alt=\"A\u00e7o carbono m\u00e9dio\" width=\"688\" height=\"417\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0440\u0435\u0434\u043d\u0435\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f-\u0441\u0442\u0430\u043b\u044c.webp 688w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0440\u0435\u0434\u043d\u0435\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f-\u0441\u0442\u0430\u043b\u044c-300x182.webp 300w, 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