{"id":21799,"date":"2025-04-06T08:28:00","date_gmt":"2025-04-06T00:28:00","guid":{"rendered":"https:\/\/steelprogroup.com\/?p=21799"},"modified":"2025-04-07T09:57:06","modified_gmt":"2025-04-07T01:57:06","slug":"nitralloy-135m-steel","status":"publish","type":"post","link":"https:\/\/steelprogroup.com\/pt\/alloy-steel\/nitralloy-135m-steel\/","title":{"rendered":"A\u00e7o Nitralloy 135M | Guia de A\u00e7o Vac-Arc Modificado Nitralloy 135"},"content":{"rendered":"<p class=\"c2 wp-block-paragraph\"><span class=\"c7\">Ind\u00fastrias que exigem resist\u00eancia ao desgaste e estabilidade superiores contam com o Nitralloy 135M por seu desempenho excepcional. No SteelPro Group, fornecemos materiais como o Nitralloy 135M de alta qualidade em diversos formatos e tamanhos, adaptados \u00e0s especifica\u00e7\u00f5es exatas. Este artigo explora suas principais propriedades, padr\u00f5es da ind\u00fastria, op\u00e7\u00f5es de produtos e processos essenciais de tratamento t\u00e9rmico.<\/span><\/p><h2 class=\"wp-block-heading c2 c28\" id=\"h.sovzh6gsi4ou\"><span class=\"c18\">O que \u00e9 a\u00e7o Nitralloy 135?<\/span><\/h2><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">O Nitralloy 135M \u00e9 um a\u00e7o de nitreta\u00e7\u00e3o de baixa liga projetado para alta dureza superficial, resist\u00eancia ao desgaste e resist\u00eancia do n\u00facleo. Ele forma uma camada nitretada r\u00edgida sem distor\u00e7\u00e3o significativa, tornando-o ideal para engrenagens, eixos, virabrequins e parafusos em aplica\u00e7\u00f5es aeroespaciais, industriais e de defesa.<\/span><\/p><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">Produzido por refus\u00e3o VAC-ARC ou VIM-VAR, apresenta alta microlimpeza e estrutura de gr\u00e3os refinados, aumentando a resist\u00eancia \u00e0 fadiga e a durabilidade. Ao contr\u00e1rio dos a\u00e7os convencionais, atinge a dureza por nitreta\u00e7\u00e3o em vez de t\u00eampera, garantindo maior estabilidade dimensional. <\/span><\/p><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">O Nitralloy 135M da SteelPro Group est\u00e1 dispon\u00edvel em diversos formatos, incluindo barras laminadas a quente, tarugos, barras retificadas sem centro e barras trefiladas a frio. Nossos produtos atendem a diversas especifica\u00e7\u00f5es do setor, como AMS 6470, AMS 6471 e AMS-S-6709.<\/span><\/p><h2 class=\"wp-block-heading c2 c28\" id=\"h.qylfhs1ubm4c\"><span class=\"c18\">Especifica\u00e7\u00f5es do A\u00e7o Nitralloy 135<\/span><\/h2><ul class=\"wp-block-list c1 lst-kix_iwcg5ybhzll0-0 start\"><li><span class=\"c12\">AMS 6470, AMS 6471, AMS-S-6709<\/span><span class=\"c7\">\u00a0\u2013 Especifica\u00e7\u00f5es de a\u00e7o de nitreta\u00e7\u00e3o de grau aeroespacial<\/span><\/li>\n\n<li><span class=\"c12\">ASTM A29, ASTM A355<\/span><span class=\"c7\">\u00a0\u2013 Barras de a\u00e7o-liga e padr\u00f5es de tratamento t\u00e9rmico<\/span><\/li>\n\n<li><span class=\"c12\">B50TA314 (GE), Bell Helicopter 299-947-036, 299-947-083<\/span><span class=\"c7\">\u00a0\u2013 Requisitos espec\u00edficos do fabricante para componentes de precis\u00e3o<\/span><\/li><\/ul><h2 class=\"wp-block-heading c25\" id=\"h.7398zygjosas\">Nitralloy 135<span class=\"c18\">&nbsp;Vis\u00e3o geral das propriedades do a\u00e7o de liga<\/span><\/h2><ul class=\"wp-block-list c1 lst-kix_wdukjxlugosv-0 start\"><li><span class=\"c7\">Alta dureza (60+ HRC ap\u00f3s nitreta\u00e7\u00e3o)<\/span><\/li>\n\n<li><span class=\"c7\">Resist\u00eancia superior ao desgaste e \u00e0 fadiga<\/span><\/li>\n\n<li><span class=\"c7\">Distor\u00e7\u00e3o m\u00ednima durante o tratamento t\u00e9rmico<\/span><\/li>\n\n<li>Boa resist\u00eancia \u00e0 corros\u00e3o<\/li><\/ul><h2 class=\"wp-block-heading c2 c28\" id=\"h.ei826o403ifj\"><span class=\"c18\">Composi\u00e7\u00e3o qu\u00edmica do a\u00e7o Nitralloy 135<\/span><\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Elementos<\/strong><\/td><td><strong>Conte\u00fado<\/strong><\/td><\/tr><tr><td>Carbono (C)<\/td><td>0.38 &#8211; 0.43%<\/td><\/tr><tr><td>Sil\u00edcio (Si)<\/td><td>0.20 &#8211; 0.40%<\/td><\/tr><tr><td>Mangan\u00eas (Mn)<\/td><td>0.50 &#8211; 0.80%<\/td><\/tr><tr><td>Cromo (Cr)<\/td><td>1.40 &#8211; 1.80%<\/td><\/tr><tr><td>Molibd\u00eanio (Mo)<\/td><td>0.30 &#8211; 0.40%<\/td><\/tr><tr><td>Alum\u00ednio (Al)<\/td><td>0.95 &#8211; 1.30%<\/td><\/tr><tr><td>N\u00edquel (Ni)<\/td><td>\u2264 0,25%<\/td><\/tr><tr><td>Cobre (Cu)<\/td><td>\u2264 0,35%<\/td><\/tr><tr><td>Enxofre (S)<\/td><td>\u2264 0,025%<\/td><\/tr><tr><td>F\u00f3sforo (P)<\/td><td>\u2264 0,025%<\/td><\/tr><tr><td>Ferro (Fe)<\/td><td>Equil\u00edbrio<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading c2 c28\" id=\"h.aoaybovkfuj0\">Propriedades mec\u00e2nicas do a\u00e7o Nitralloy 135<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td rowspan=\"2\"><strong>Propriedade<\/strong><\/td><td colspan=\"3\"><strong>Tamanho (polegadas\/cm)<\/strong><\/td><\/tr><tr><td><strong>\u2264 1\u00bd polegadas (\u22643,8 cm)<\/strong><\/td><td><strong>1\u00bd \u2013 3 polegadas (3,8 \u2013 7,6 cm)<\/strong><\/td><td><strong>3 \u2013 5 polegadas (7,6 \u2013 12,7 cm)<\/strong><\/td><\/tr><tr><td>Resist\u00eancia \u00e0 tra\u00e7\u00e3o<\/td><td>135 ksi (930 MPa)<\/td><td>125 ksi (860 MPa)<\/td><td>110 ksi (760 MPa)<\/td><\/tr><tr><td>Resist\u00eancia ao rendimento<\/td><td>100 ksi (690 MPa)<\/td><td>90 ksi (620 MPa)<\/td><td>85 ksi (580 MPa)<\/td><\/tr><tr><td>Alongamento (%)<\/td><td>16%<\/td><td>15%<\/td><td>15%<\/td><\/tr><tr><td>Redu\u00e7\u00e3o de \u00c1rea (%)<\/td><td>50%<\/td><td>40%<\/td><td>40%<\/td><\/tr><tr><td>Dureza (HBW)<\/td><td>280 &#8211; 340<\/td><td>280 \u2013 340 (superf\u00edcie)<\/td><td>269 \u2013 321 (superf\u00edcie)<\/td><\/tr><tr><td>M\u00e9todo de t\u00eampera<\/td><td>Temperado em \u00f3leo<\/td><td>Temperado em \u00f3leo<\/td><td>Temperado em \u00e1gua<\/td><\/tr><tr><td>Temperatura de t\u00eampera<\/td><td>1200\u00b0F (648\u00b0C), resfriado a ar<\/td><td>1200\u00b0F (648\u00b0C), resfriado a ar<\/td><td>1200\u00b0F (648\u00b0C), resfriado a ar<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading c2 c28\" id=\"h.b5yts9exvwur\"><span class=\"c18\">Propriedades f\u00edsicas do a\u00e7o Nitralloy 135<\/span><\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Propriedade<\/strong><\/td><td><strong>Valor imperial<\/strong><\/td><td><strong>Valor m\u00e9trico<\/strong><\/td><\/tr><tr><td>Densidade<\/td><td>0,297 lbs\/pol\u00b3<\/td><td>8,22 g\/cm\u00b3<\/td><\/tr><tr><td>Ponto de fus\u00e3o<\/td><td>~2600\u00b0F<\/td><td>~1427\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading c2 c28\" id=\"h.drwqidqli630\"><span class=\"c18\">Especifica\u00e7\u00e3o de produtos de a\u00e7o Nitralloy 135<\/span><\/h2><p class=\"c2 wp-block-paragraph\">O SteelPro Group oferece <span class=\"c12\">barras de 135 m laminadas a quente, retificadas sem centro, torneadas em bruto e trefiladas a frio<\/span><span class=\"c7\">, garantindo alta precis\u00e3o e confiabilidade para aplica\u00e7\u00f5es exigentes. Tamanhos personalizados podem ser fornecidos mediante solicita\u00e7\u00e3o para atender a requisitos espec\u00edficos de engenharia.<\/span><\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Formul\u00e1rio do produto<\/strong><\/td><td><strong>Faixa de di\u00e2metro\/espessura<\/strong><\/td><td><strong>Comprimento<\/strong><\/td><\/tr><tr><td>Barras redondas laminadas a quente<\/td><td>0,50\u201d \u2013 10\u201d (12,7 mm \u2013 254 mm)<\/td><td>At\u00e9 20 p\u00e9s (6 m)<\/td><\/tr><tr><td>Barras redondas trefiladas a frio<\/td><td>0,25\u201d \u2013 3\u201d (6,35 mm \u2013 76,2 mm)<\/td><td>At\u00e9 12 p\u00e9s (3,6 m)<\/td><\/tr><tr><td>Barras de aterramento sem centro<\/td><td>0,50\u201d \u2013 4\u201d (12,7 mm \u2013 101,6 mm)<\/td><td>At\u00e9 12 p\u00e9s (3,6 m)<\/td><\/tr><tr><td>Barras torneadas em bruto<\/td><td>2\u201d \u2013 12\u201d (50,8 mm \u2013 304,8 mm)<\/td><td>Comprimentos personalizados dispon\u00edveis<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading c25\" id=\"h.syd4m5ybpl6\"><span class=\"c18\">Aplica\u00e7\u00f5es do A\u00e7o Nitralloy 135<\/span><\/h2><p class=\"c2 wp-block-paragraph\">O Nitralloy 135M \u00e9 amplamente utilizado em ind\u00fastrias que exigem <span class=\"c12\">alta dureza superficial, resist\u00eancia ao desgaste e estabilidade dimensional<\/span><span class=\"c7\">&nbsp;ap\u00f3s nitreta\u00e7\u00e3o.<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_byzd27sj3nmy-0 start\"><li><span class=\"c12\">Aeroespacial<\/span><span class=\"c7\">: Engrenagens, eixos, pinh\u00f5es, virabrequins, \u00e1rvores de cames e parafusos de alta resist\u00eancia para aeronaves.<\/span><\/li>\n\n<li><span class=\"c12\">Defesa<\/span><span class=\"c7\">: Componentes de armas, equipamentos para ve\u00edculos militares e pe\u00e7as estruturais de n\u00edvel aeroespacial.<\/span><\/li>\n\n<li><span class=\"c12\">Industrial e Transporte<\/span><span class=\"c7\">: Virabrequins de alto desempenho, fixadores de precis\u00e3o, componentes de m\u00e1quinas de carga pesada.<\/span><\/li>\n\n<li><span class=\"c12\">Ferramentaria e Fabrica\u00e7\u00e3o<\/span><span class=\"c7\">: Componentes de moldes e matrizes, ferramentas de corte e ferramentas de conforma\u00e7\u00e3o.<\/span><\/li><\/ul><h2 class=\"wp-block-heading c2 c28\" id=\"h.vrtife2y7ry5\"><span class=\"c18\">Tratamento t\u00e9rmico do a\u00e7o Nitralloy 135<\/span><\/h2><h3 class=\"wp-block-heading c5\" id=\"h.5cp926btn7wo\"><span class=\"c26\">1. Forjamento<\/span><\/h3><ul class=\"wp-block-list c1 lst-kix_9i6i3ck4b65m-0 start\"><li><span class=\"c12\">Temperatura de aquecimento<\/span>: <span class=\"c9\">2000-2025\u00b0F (1093-1107\u00b0C)<\/span><\/li>\n\n<li><span class=\"c12\">Temperatura m\u00ednima de forjamento<\/span>: <span class=\"c9\">1700\u00b0F (927\u00b0C)<\/span><\/li>\n\n<li><span class=\"c12\">M\u00e9todo de resfriamento<\/span>: <span class=\"c12\">Resfriamento ao ar ap\u00f3s forjamento<\/span><span class=\"c7\">\u00a0para evitar o engrossamento indesejado dos gr\u00e3os.<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\">Manter uma distribui\u00e7\u00e3o uniforme de calor \u00e9 crucial para evitar inconsist\u00eancias estruturais. O a\u00e7o n\u00e3o deve ser forjado abaixo <span class=\"c12\">1700\u00b0F (927\u00b0C)<\/span><span class=\"c7\">&nbsp;para manter propriedades mec\u00e2nicas ideais.<\/span><\/p><h3 class=\"wp-block-heading c5\" id=\"h.fz3qvk7ow25\"><span class=\"c26\">2. Recozimento<\/span><\/h3><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">Dois m\u00e9todos de recozimento podem ser aplicados dependendo da aplica\u00e7\u00e3o final:<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_chikombkqjfe-0 start\"><li><span class=\"c12\">Recozimento total<\/span><span class=\"c7\">:<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">Temperatura<\/span>: <span class=\"c9\">1700\u00b0F (927\u00b0C)<\/span><\/p><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">M\u00e9todo de resfriamento<\/span>: <span class=\"c12\">Resfriamento lento<\/span><span class=\"c7\">&nbsp;na fornalha.<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_chikombkqjfe-0\"><li><span class=\"c12\">Recozimento subcr\u00edtico<\/span><span class=\"c7\">\u00a0(Al\u00edvio do estresse):<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">Temperatura<\/span>: <span class=\"c9\">1250-1300\u00b0F (675-704\u00b0C)<\/span><\/p><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">M\u00e9todo de resfriamento<\/span>: <span class=\"c12\">Resfriamento lento controlado<\/span><span class=\"c7\">&nbsp;para melhorar a usinabilidade.<\/span><\/p><p class=\"c2 wp-block-paragraph\">Esta etapa \u00e9 crucial para melhorar <span class=\"c12\">ductilidade e usinabilidade<\/span><span class=\"c7\">, especialmente antes de outros tratamentos t\u00e9rmicos ou processos de usinagem.<\/span><\/p><h3 class=\"wp-block-heading c5\" id=\"h.k88jv7xusyeu\"><span class=\"c26\">3. Normalizando<\/span><\/h3><ul class=\"wp-block-list c1 lst-kix_lx1vzhe2m86h-0 start\"><li><span class=\"c12\">Temperatura<\/span>: <span class=\"c9\">1800\u00b0F (982\u00b0C)<\/span><\/li>\n\n<li><span class=\"c12\">Tempo de imers\u00e3o<\/span>: <span class=\"c12\">1 a 4 horas<\/span><span class=\"c7\">, dependendo da espessura da se\u00e7\u00e3o.<\/span><\/li>\n\n<li><span class=\"c12\">M\u00e9todo de resfriamento<\/span>: <span class=\"c12\">Resfriamento a ar<\/span><span class=\"c7\">.<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">A normaliza\u00e7\u00e3o refina a estrutura do gr\u00e3o, remove tens\u00f5es residuais e melhora a tenacidade antes das opera\u00e7\u00f5es de t\u00eampera.<\/span><\/p><h3 class=\"wp-block-heading c5\" id=\"h.kj04ws5ewmpl\"><span class=\"c26\">4. Austenitiza\u00e7\u00e3o e t\u00eampera<\/span><\/h3><p class=\"c2 wp-block-paragraph\">Para atingir a resist\u00eancia e a microestrutura do n\u00facleo desejadas antes da nitreta\u00e7\u00e3o, <span class=\"c12\">austenitiza\u00e7\u00e3o e t\u00eampera<\/span><span class=\"c7\">&nbsp;deve ser realizado:<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_8kaqgs8v0c2t-0 start\"><li><span class=\"c12\">Temperatura de Austenitiza\u00e7\u00e3o<\/span><span class=\"c7\">:<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c9\">1700-1750\u00b0F (927-954\u00b0C)<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_8kaqgs8v0c2t-0\"><li><span class=\"c12\">Tempo de espera<\/span><span class=\"c7\">:<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">0,5 horas por polegada (2,54 cm) de se\u00e7\u00e3o transversal<\/span><span class=\"c7\">.<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_8kaqgs8v0c2t-0\"><li><span class=\"c12\">Meio de t\u00eampera<\/span><span class=\"c7\">:<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">T\u00eampera em \u00f3leo<\/span><span class=\"c7\">&nbsp;(recomendado para se\u00e7\u00f5es transversais \u22641 polegada ou 2,54 cm).<\/span><\/p><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">T\u00eampera em \u00e1gua<\/span><span class=\"c7\">&nbsp;(preferido para se\u00e7\u00f5es &gt;1 polegada ou 2,54 cm para garantir dureza uniforme).<\/span><\/p><p class=\"c2 wp-block-paragraph\">Este processo garante <span class=\"c12\">alta resist\u00eancia e tenacidade<\/span><span class=\"c7\">, preparando o material para posterior revenimento e nitreta\u00e7\u00e3o.<\/span><\/p><h3 class=\"wp-block-heading c5\" id=\"h.nrsoovu719ow\"><span class=\"c26\">5. T\u00eampera<\/span><\/h3><ul class=\"wp-block-list c1 lst-kix_v28i90ui5xfc-0 start\"><li><span class=\"c12\">Faixa de temperatura<\/span>: <span class=\"c9\">1000-1300\u00b0F (538-704\u00b0C)<\/span><\/li>\n\n<li><span class=\"c12\">Tempo de imers\u00e3o<\/span>: <span class=\"c9\">1 hora por polegada (2,54 cm) de espessura<\/span><\/li>\n\n<li><span class=\"c12\">M\u00e9todo de resfriamento<\/span>: <span class=\"c9\">Resfriamento a ar<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">O revenimento alivia tens\u00f5es residuais da t\u00eampera e ajusta a dureza com base nos requisitos da aplica\u00e7\u00e3o.<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_crk1k1wpagxb-0 start\"><li><span class=\"c12\">Temperaturas de t\u00eampera mais baixas (~1000\u00b0F \/ 538\u00b0C)<\/span><span class=\"c7\">\u00a0\u2192 Maior dureza<\/span><\/li>\n\n<li><span class=\"c12\">Temperaturas de t\u00eampera mais altas (~1300\u00b0F \/ 704\u00b0C)<\/span><span class=\"c7\">\u00a0\u2192 Resist\u00eancia melhorada<\/span><\/li><\/ul><h3 class=\"wp-block-heading c5\" id=\"h.1tfbzt6190gn\"><span class=\"c26\">6. Nitreta\u00e7\u00e3o<\/span><\/h3><p class=\"c2 wp-block-paragraph\"><span class=\"c12\">A nitreta\u00e7\u00e3o \u00e9 o processo mais cr\u00edtico para o Nitralloy 135M, proporcionando dureza superficial e resist\u00eancia ao desgaste superiores.<br><\/span><span class=\"c7\">Os par\u00e2metros do ciclo de nitreta\u00e7\u00e3o dependem de requisitos de desempenho espec\u00edficos:<\/span><\/p><ul class=\"wp-block-list c1 lst-kix_qooudqpc7v15-0 start\"><li><span class=\"c12\">Faixa de temperatura<\/span>: <span class=\"c9\">900-1100\u00b0F (482-593\u00b0C)<\/span><\/li>\n\n<li><span class=\"c12\">Atmosfera de Processo<\/span>: <span class=\"c9\">G\u00e1s de am\u00f4nia dissociado ou ambiente de nitreta\u00e7\u00e3o controlado<\/span><\/li>\n\n<li><span class=\"c12\">Tempo<\/span>: <span class=\"c9\">Varia de acordo com a aplica\u00e7\u00e3o<\/span><\/li><\/ul><p class=\"c2 wp-block-paragraph\">Durante a nitreta\u00e7\u00e3o, o nitrog\u00eanio difunde-se na superf\u00edcie, formando uma <span class=\"c12\">camada de nitreto de alta dureza<\/span>&nbsp;preservando a for\u00e7a do n\u00facleo. Isto <span class=\"c12\">elimina a necessidade de t\u00eampera adicional<\/span><span class=\"c7\">, minimizando a distor\u00e7\u00e3o dimensional.<\/span><\/p><h2 class=\"wp-block-heading c28 c32\" id=\"h.hjp06n97861v\"><span class=\"c18\">Obtenha a\u00e7o Nitralloy 135M de alto desempenho<\/span><\/h2><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">&nbsp;No SteelPro Group, fornecemos a\u00e7o de alta qualidade, como o Nitralloy 135M, em diversos tamanhos e formatos, garantindo um desempenho confi\u00e1vel. Nossos materiais atendem aos rigorosos padr\u00f5es da ind\u00fastria e passam por rigoroso controle de qualidade, para que voc\u00ea tenha um a\u00e7o com desempenho consistente em condi\u00e7\u00f5es extremas. <\/span><\/p><p class=\"c2 wp-block-paragraph\"><span class=\"c7\">N\u00e3o importa se voc\u00ea precisa de tamanhos padr\u00e3o ou solu\u00e7\u00f5es personalizadas, nossos especialistas est\u00e3o prontos para ajudar voc\u00ea a encontrar o ajuste certo!<\/span><\/p><p class=\"wp-block-paragraph\">&nbsp;<\/p><p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Descubra as propriedades, especifica\u00e7\u00f5es e tratamento t\u00e9rmico do a\u00e7o Nitralloy 135M. 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