{"id":5482,"date":"2025-04-29T09:12:45","date_gmt":"2025-04-29T01:12:45","guid":{"rendered":"https:\/\/uniasen.com\/?p=5482"},"modified":"2025-04-29T09:17:08","modified_gmt":"2025-04-29T01:17:08","slug":"astm-a500-specification","status":"publish","type":"post","link":"https:\/\/uniasen.com\/pt\/blog\/especificacao-astm-a500\/","title":{"rendered":"Especifica\u00e7\u00f5es ASTM A500"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4772\" src=\"https:\/\/uniasen.com\/wp-content\/uploads\/2024\/09\/Advantages_of_Black_Steel_Pipe.webp\" alt=\"Vantagens do tubo de a\u00e7o preto\" width=\"703\" height=\"527\" srcset=\"https:\/\/uniasen.com\/wp-content\/uploads\/2024\/09\/Advantages_of_Black_Steel_Pipe.webp 1000w, https:\/\/uniasen.com\/wp-content\/uploads\/2024\/09\/Advantages_of_Black_Steel_Pipe-300x225.webp 300w, https:\/\/uniasen.com\/wp-content\/uploads\/2024\/09\/Advantages_of_Black_Steel_Pipe-768x576.webp 768w, https:\/\/uniasen.com\/wp-content\/uploads\/2024\/09\/Advantages_of_Black_Steel_Pipe-16x12.webp 16w\" sizes=\"auto, (max-width: 703px) 100vw, 703px\" \/><\/p>\n<h2><strong><b>Especifica\u00e7\u00f5es t\u00e9cnicas ASTM A500<\/b><\/strong><\/h2>\n<p>A American Society for Testing and Materials prescreve o padr\u00e3o A500 para tubos de a\u00e7o carbono. Ela consiste em requisitos exaustivos de material, f\u00edsicos e metrol\u00f3gicos. Os tubos de a\u00e7o que atendem a essas especifica\u00e7\u00f5es s\u00e3o aprovados como tubos padr\u00e3o A500. Os tubos A500 s\u00e3o caracteristicamente formados a frio e perfeitamente soldados. Eles s\u00e3o fabricados em uma variedade de formatos. O ASTM A500 \u00e9 um padr\u00e3o vers\u00e1til de a\u00e7o doce adequado para transporte, suporte e constru\u00e7\u00e3o.<\/p>\n<h3><strong><b>Alcance e forma<\/b><\/strong><\/h3>\n<p>Um dos principais motivos pelos quais recomendamos os tubos de a\u00e7o A500 \u00e9 sua variedade de formatos. Sua disponibilidade em diferentes formas significa que voc\u00ea certamente encontrar\u00e1 o melhor produto para sua aplica\u00e7\u00e3o. Por exemplo, os tubos em formato de cubo e cuboidal s\u00e3o comumente usados em estruturas de constru\u00e7\u00e3o e suporte.<\/p>\n<p>Os tubos de a\u00e7o A500 com se\u00e7\u00f5es transversais circulares podem transportar qualquer meio, como \u00e1gua, \u00f3leo, g\u00e1s ou hidrocarbonetos. Eles tamb\u00e9m s\u00e3o fornecidos em uma grande variedade de dimens\u00f5es. O encanamento interno geralmente utiliza tubos A500 com um di\u00e2metro externo de 0,25 polegadas. No entanto, ele pode chegar a 24 polegadas em aplica\u00e7\u00f5es que exigem maior capacidade. A maior espessura da parede aumenta a propriedade de manuseio de press\u00e3o do tubo. Dependendo de suas preocupa\u00e7\u00f5es com resist\u00eancia e press\u00e3o, \u00e9 poss\u00edvel obter espessuras de tubo entre 3 e 12 mm.<\/p>\n<h3><strong><b>Grau e propriedades mec\u00e2nicas<\/b><\/strong><\/h3>\n<p>A ASTM dividiu os v\u00e1rios atributos f\u00edsicos e de composi\u00e7\u00e3o dos tubos de a\u00e7o em v\u00e1rios graus para encapsular sua composi\u00e7\u00e3o. Os tubos A500 s\u00e3o fornecidos em quatro graus, a saber, grau A, grau B, grau C e grau D. Voc\u00ea pode esperar que cada grau tenha um desempenho diferente. As caracter\u00edsticas comuns do a\u00e7o diferem em cada grau. As diferen\u00e7as s\u00e3o observadas no rendimento e na resist\u00eancia \u00e0 tra\u00e7\u00e3o. O alongamento, o custo e a disponibilidade s\u00e3o outras preocupa\u00e7\u00f5es.<\/p>\n<p>Por exemplo, o grau B ser\u00e1 adequado se voc\u00ea precisar de um tubo de a\u00e7o vers\u00e1til com baixa resist\u00eancia e classifica\u00e7\u00e3o de press\u00e3o. Ele pode fornecer uma resist\u00eancia ao escoamento de pelo menos 46.000 psi. Sua resist\u00eancia \u00e0 tra\u00e7\u00e3o \u00e9 de 58.000 psi. Ele pode ser alongado em um m\u00ednimo de 23% em duas polegadas. Para aplica\u00e7\u00f5es pesadas, o grau C \u00e9 mais adequado. A resist\u00eancia ao escoamento desse tubo chega a 50.000 psi. Ele pode atingir uma resist\u00eancia \u00e0 tra\u00e7\u00e3o ainda maior, de 62.000 psi. Consequentemente, ele tem um alongamento menor, de 21% em duas polegadas.<\/p>\n<h3><strong><b>Composi\u00e7\u00e3o qu\u00edmica<\/b><\/strong><\/h3>\n<p>Como voc\u00ea deve ter percebido, os tubos A500 s\u00e3o principalmente tubos de a\u00e7o doce. Portanto, seus principais componentes s\u00e3o ferro e carbono. A ASTM descreve v\u00e1rios outros metais que melhoram as propriedades do a\u00e7o doce. Seus componentes e a t\u00e9cnica de fabrica\u00e7\u00e3o caracterizam cada grau. Podemos classificar os graus A, B e D juntos. Eles t\u00eam um teor de carbono de 0,30% por massa. Al\u00e9m disso, possuem f\u00f3sforo e enxofre, 0,045% por massa. \u00c0s vezes, eles podem ser rotulados como a\u00e7o cobre. Nesses casos, voc\u00ea tamb\u00e9m pode esperar 0,18% de cobre por massa.<\/p>\n<p>Por outro lado, o grau C tem um teor m\u00e1ximo de carbono de 0,27% em massa e 1,40% de mangan\u00eas. O mangan\u00eas n\u00e3o est\u00e1 presente nos graus A, B e D. A porcentagem de f\u00f3sforo, enxofre e cobre \u00e9 semelhante \u00e0 dos outros graus.<\/p>\n<h3><strong><b>Toler\u00e2ncia dimensional<\/b><\/strong><\/h3>\n<p>Uma das caracter\u00edsticas superiores dos tubos A500 \u00e9 sua toler\u00e2ncia dimensional. Ela permite que v\u00e1rios fabricantes os implementem com confian\u00e7a e seguran\u00e7a. Se o fabricante tiver estabelecido um di\u00e2metro externo n\u00e3o superior a 1,9 pol., a toler\u00e2ncia ser\u00e1 de 0,5%. A magnitude calculada n\u00e3o deve diferir em mais de 0,005 pol. ou 0,13 mm.<\/p>\n<p>As regras s\u00e3o diferentes quando o fabricante estabelece um di\u00e2metro externo de mais de 2 pol. Nesse caso, a toler\u00e2ncia \u00e9 definida como 0,75%. O valor medido deve ficar abaixo de 0,005 pol. ou 0,13 mm. Deve-se observar que a medi\u00e7\u00e3o do di\u00e2metro externo \u00e9 feita a mais de 2 polegadas da abertura do tubo.<\/p>\n<p>Os tubos A500 se destacam por sua toler\u00e2ncia superior \u00e0 espessura da parede. Eles t\u00eam uma toler\u00e2ncia m\u00ednima e m\u00e1xima de 10% para a espessura da parede. Nenhum dos dois valores deve ultrapassar 10% das especifica\u00e7\u00f5es do desenho.<\/p>\n<p>A toler\u00e2ncia do \u00e2ngulo reto determina a retid\u00e3o dos tubos A500. Para tubos de a\u00e7o estrutural, a varia\u00e7\u00e3o permitida \u00e9 de 10,4 mm multiplicada por 0,2 vezes o comprimento total do tubo em metros. Da mesma forma, os cantos externos dos tubos quadrados e retangulares n\u00e3o devem ultrapassar 3 vezes a espessura da parede dos tubos.<\/p>\n<h3><strong><b>Requisitos de teste<\/b><\/strong><\/h3>\n<p>A ASTM prescreve testes padronizados para garantir que os tubos fabricados atendam a todos os crit\u00e9rios necess\u00e1rios. Esses m\u00e9todos de teste garantem que o a\u00e7o estrutural e de transporte seja adequado para uso no setor. Os testes de estrutura qu\u00edmica garantem que o a\u00e7o usado nos tubos A500 atenda \u00e0s folhas de especifica\u00e7\u00e3o. Os testes mec\u00e2nicos garantem que o a\u00e7o estrutural atenda aos crit\u00e9rios de rendimento e resist\u00eancia \u00e0 tra\u00e7\u00e3o. As verifica\u00e7\u00f5es de toler\u00e2ncia de achatamento e tor\u00e7\u00e3o garantem que o tubo de a\u00e7o mantenha a retid\u00e3o em tubos retangulares ou quadrados.<\/p>\n<h3><strong><b>Processo de fabrica\u00e7\u00e3o<\/b><\/strong><\/h3>\n<p>Dois modos de produ\u00e7\u00e3o s\u00e3o empregados para fabricar os tubos ASTM A500. Uma das t\u00e9cnicas mais amplamente aplicadas \u00e9 o arco de soldagem por resist\u00eancia el\u00e9trica. Ela come\u00e7a com uma bobina de a\u00e7o como mat\u00e9ria-prima. A bobina de a\u00e7o \u00e9 nivelada, soldada na extremidade, laminada e soldada longitudinalmente para produzir tubos de a\u00e7o. A fabrica\u00e7\u00e3o de tubos ERW \u00e9 r\u00e1pida e econ\u00f4mica devido \u00e0 otimiza\u00e7\u00e3o da correia transportadora. O outro processo de fabrica\u00e7\u00e3o de tubos A500 \u00e9 a t\u00e9cnica sem costura. O principal ingrediente bruto desse m\u00e9todo s\u00e3o os tarugos de a\u00e7o. O tarugo \u00e9 perfurado longitudinalmente usando um moinho ou uma prensa de perfura\u00e7\u00e3o. Ele \u00e9 laminado e extrudado para dar a forma, a espessura e o di\u00e2metro corretos. Os tubos de a\u00e7o sem costura s\u00e3o caros, mas oferecem resist\u00eancia muito maior \u00e0 tra\u00e7\u00e3o e ao escoamento.<\/p>\n<h3><strong><b>Aplica\u00e7\u00e3o do tubo ASTM A500<\/b><\/strong><\/h3>\n<p>Os tubos de a\u00e7o ASTM A500 t\u00eam in\u00fameras aplica\u00e7\u00f5es no setor. Eles s\u00e3o componentes estruturais em colunas de constru\u00e7\u00e3o, andaimes e estruturas. O setor de petr\u00f3leo e g\u00e1s emprega tubos de a\u00e7o A500 por sua excelente resist\u00eancia e longevidade. Sistemas mec\u00e2nicos, como m\u00e1quinas hidr\u00e1ulicas e pneum\u00e1ticas, usam tubos de a\u00e7o A500 para transmiss\u00e3o de energia. Os tubos A500 t\u00eam uma finalidade semelhante nos setores automotivo e de energia. O padr\u00e3o ASTM A500 \u00e9 altamente vers\u00e1til e desej\u00e1vel nos setores.<\/p>","protected":false},"excerpt":{"rendered":"<p>Especifica\u00e7\u00f5es t\u00e9cnicas ASTM A500 A American Society for Testing and Materials prescreve o padr\u00e3o A500 para tubos de a\u00e7o carbono. Ela consiste em requisitos exaustivos de material, f\u00edsicos e metrol\u00f3gicos. Os tubos de a\u00e7o que atendem a essas especifica\u00e7\u00f5es s\u00e3o aprovados como tubos padr\u00e3o A500. Os tubos A500 s\u00e3o caracteristicamente formados a frio e perfeitamente soldados. Eles s\u00e3o fabricados em um...<\/p>","protected":false},"author":10,"featured_media":5485,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5482","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ASTM A500 Specifications | A500 Grades A, B, C, D<\/title>\n<meta name=\"description\" content=\"ASTM A500 outlines specifications for cold-formed, welded, and seamless carbon steel tubing in round, square, rectangular, or unique shapes for structural use. 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