{"id":17946,"date":"2023-11-23T08:51:49","date_gmt":"2023-11-23T08:51:49","guid":{"rendered":"https:\/\/www.uf-tools.com\/?p=17946"},"modified":"2023-11-23T08:51:53","modified_gmt":"2023-11-23T08:51:53","slug":"chromium-molybdenum-or-chromium-vanadium-steel-which-is-better%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.uf-tools.com\/pt\/cromo-molibdenio-ou-cromo-vanadio-aco-que-e-melhor%ef%bc%9f\/","title":{"rendered":"A\u00e7o cr\u00f3mio-molibd\u00e9nio ou a\u00e7o cr\u00f3mio-van\u00e1dio QUAL \u00c9 O MELHOR PARA FERRAMENTAS DE M\u00c3O?"},"content":{"rendered":"<p class=\"\">Cr\u00f3mio-molibd\u00e9nio (tamb\u00e9m designado por cr\u00f3mio-molibd\u00e9nio, cr\u00f3mio-molibd\u00e9nio ou Cr-Mo) e cr\u00f3mio-van\u00e1dio (tamb\u00e9m designado por cr\u00f3mio-van\u00e1dio ou Cr-V) s\u00e3o nomes de duas fam\u00edlias de ligas de a\u00e7o utilizadas no fabrico de ferramentas manuais. Qual delas \u00e9 a melhor? Quando corretamente fabricadas e tratadas termicamente, s\u00e3o quimicamente quase id\u00eanticas e t\u00eam um desempenho semelhante.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>O que \u00e9 o a\u00e7o?<\/strong><\/h2>\n\n\n\n<p class=\"\">O a\u00e7o \u00e9, em peso, maioritariamente ferro (frequentemente 90% ou mais) com pequenas quantidades de carbono (normalmente 0,1% a 2%) e, por vezes, elementos de liga misturados. Sem tratamento t\u00e9rmico e sem elementos de liga, o a\u00e7o \u00e9 demasiado macio para ser utilizado nas melhores ferramentas manuais. Ao misturar elementos de liga e submeter a mistura a altas temperaturas para alterar a sua dureza, podemos modificar as propriedades mec\u00e2nicas como a dureza, a resist\u00eancia, a tenacidade e a ductilidade.<\/p>\n\n\n\n<p class=\"\">No entanto, mesmo nas melhores circunst\u00e2ncias, algumas destas propriedades implicam compromissos. Por exemplo, um a\u00e7o extremamente duro ser\u00e1 forte, mas tamb\u00e9m fr\u00e1gil. Em vez de se deformar elasticamente e depois recuperar quando a tens\u00e3o \u00e9 removida, o a\u00e7o duro tende a partir-se sob tens\u00e3o elevada.<\/p>\n\n\n\n<p class=\"\">Algumas propriedades comuns do a\u00e7o incluem o seguinte:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Dureza: resist\u00eancia de um material ao desgaste e aos riscos.<\/li>\n\n\n\n<li class=\"\">Resist\u00eancia: a capacidade de um material ser sujeito a tens\u00f5es sem se deformar permanentemente.<\/li>\n\n\n\n<li class=\"\">Ductilidade: capacidade de um material se deformar permanentemente sob tens\u00e3o antes de se partir.<\/li>\n\n\n\n<li class=\"\">Dureza: combina\u00e7\u00e3o de resist\u00eancia e ductilidade de um material que lhe permite absorver energia sem se partir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tratamento t\u00e9rmico<\/strong><\/h2>\n\n\n\n<p class=\"\">O tratamento t\u00e9rmico significa aumentar a temperatura do a\u00e7o e arrefec\u00ea-lo em passos precisos e controlados para alterar a sua estrutura interna. A n\u00edvel microsc\u00f3pico, o a\u00e7o \u00e9 feito de pequenos gr\u00e3os, que s\u00e3o grupos de \u00e1tomos de metal dispostos em cristais.<\/p>\n\n\n\n<p class=\"\">O tratamento t\u00e9rmico pode alterar tanto as dimens\u00f5es dos gr\u00e3os como a disposi\u00e7\u00e3o geom\u00e9trica dos \u00e1tomos no a\u00e7o. As diferentes dimens\u00f5es e disposi\u00e7\u00f5es dos gr\u00e3os reagem de forma diferente \u00e0 tens\u00e3o. Por exemplo, os gr\u00e3os maiores deslizam uns sobre os outros mais facilmente, o que torna o a\u00e7o mais macio do que seria com gr\u00e3os mais pequenos para resistir melhor ao movimento.<\/p>\n\n\n\n<p class=\"\">O tratamento t\u00e9rmico tamb\u00e9m pode alterar a disposi\u00e7\u00e3o dos \u00e1tomos. Os cientistas deram nomes a diferentes arranjos geom\u00e9tricos, tais como \"austenite\", \"ferrite\" e \"martensite\". A mesma liga de a\u00e7o tem propriedades diferentes consoante a forma como os \u00e1tomos est\u00e3o dispostos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Elementos de liga<\/strong><\/h2>\n\n\n\n<p class=\"\">O a\u00e7o feito apenas de ferro e carbono \u00e9 designado por \"a\u00e7o-carbono\". N\u00e3o \u00e9 considerado uma liga de a\u00e7o. O a\u00e7o de baixo teor de carbono, que tem muito pouco carbono, \u00e9 fraco e n\u00e3o responde bem ao tratamento t\u00e9rmico. O a\u00e7o com alto teor de carbono tamb\u00e9m come\u00e7a por ser fraco, mas pode ser convertido num a\u00e7o forte e quebradi\u00e7o atrav\u00e9s de tratamento t\u00e9rmico.<\/p>\n\n\n\n<p class=\"\">Os elementos de liga podem ser adicionados ao ferro e ao carbono para produzir a\u00e7o com combina\u00e7\u00f5es desej\u00e1veis de propriedades mec\u00e2nicas para aplica\u00e7\u00f5es espec\u00edficas. Os elementos de liga mais comuns incluem o boro, o cr\u00f3mio, o mangan\u00eas, o molibd\u00e9nio, o n\u00edquel e o van\u00e1dio.<\/p>\n\n\n\n<p class=\"\">Eis algumas propriedades afectadas por estes elementos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Boro: facilita o endurecimento do a\u00e7o.<\/li>\n\n\n\n<li class=\"\">Cr\u00f3mio: torna o a\u00e7o mais forte, mais duro e mais f\u00e1cil de endurecer; aumenta a resist\u00eancia \u00e0 corros\u00e3o. Em concentra\u00e7\u00f5es elevadas, produz o \"a\u00e7o inoxid\u00e1vel\", que resiste fortemente \u00e0 corros\u00e3o.<\/li>\n\n\n\n<li class=\"\">Mangan\u00eas: melhora o processamento do a\u00e7o ao limitar a oxida\u00e7\u00e3o.<\/li>\n\n\n\n<li class=\"\">Molibd\u00e9nio: torna o a\u00e7o mais forte, mais duro e mais f\u00e1cil de endurecer. Aumenta a dureza com elevada resist\u00eancia.<\/li>\n\n\n\n<li class=\"\">N\u00edquel: aumenta a dureza com uma resist\u00eancia elevada. Tamb\u00e9m aumenta a resist\u00eancia \u00e0 corros\u00e3o.<\/li>\n\n\n\n<li class=\"\">Van\u00e1dio: aumenta a tenacidade com elevada resist\u00eancia; reduz o tamanho dos gr\u00e3os.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>De que a\u00e7o devem ser feitas as ferramentas manuais?<\/strong><\/h2>\n\n\n\n<p class=\"\">Embora o a\u00e7o com elevado teor de carbono possa ser adequado para ferramentas manuais cujo principal requisito \u00e9 uma superf\u00edcie dura, como algumas l\u00e2minas, a maioria das ferramentas manuais beneficia de uma combina\u00e7\u00e3o de dureza, tenacidade e resist\u00eancia \u00e0 corros\u00e3o. As ligas como o cr\u00f3mio-molibd\u00e9nio e o cr\u00f3mio-van\u00e1dio s\u00e3o mais eficazes do que o a\u00e7o com elevado teor de carbono para obter estas propriedades combinadas.<\/p>\n\n\n\n<p class=\"\">Por cr\u00f3mio-molibd\u00e9nio entende-se especificamente uma fam\u00edlia de ligas de a\u00e7o que, quando utilizadas em ferramentas manuais, t\u00eam uma quantidade moderada de carbono (frequentemente entre 0,4% e 0,5%), cerca de 1% de cr\u00f3mio, cerca de 0,15% a 0,20% de molibd\u00e9nio e uma gama de outros elementos de liga. A designa\u00e7\u00e3o dada pela Society of Automotive Engineers (SAE) segue normalmente o padr\u00e3o 4XXX. Por exemplo, 4140 \u00e9 um a\u00e7o comum de cr\u00f3mio-molibd\u00e9nio com 0,40% de carbono, que \u00e9 o que o 40 em 4140 indica.<\/p>\n\n\n\n<p class=\"\">Cromo-van\u00e1dio significa especificamente uma fam\u00edlia de ligas de a\u00e7o que, quando utilizadas em ferramentas manuais, t\u00eam uma quantidade moderada de carbono (frequentemente entre 0,4% e 0,5%), cerca de 1% de cr\u00f3mio, cerca de 0,15% - 0,20% de van\u00e1dio e uma gama de outros elementos de liga. A designa\u00e7\u00e3o SAE segue normalmente o padr\u00e3o 6XXX. Por exemplo, 6150 \u00e9 um a\u00e7o cromo-van\u00e1dio comum com 0,50% de carbono, que \u00e9 o que o 50 em 6150 indica.<\/p>\n\n\n\n<p class=\"\">O cr\u00f3mio-molibd\u00e9nio e o cr\u00f3mio-van\u00e1dio produzidos com o mesmo cuidado e endurecidos a n\u00edveis semelhantes t\u00eam propriedades mec\u00e2nicas muito semelhantes. De facto, s\u00e3o praticamente id\u00eanticos do ponto de vista qu\u00edmico, sendo a principal diferen\u00e7a muito inferior a 0,5% em peso sob a forma de molibd\u00e9nio ou de van\u00e1dio. Por conseguinte, n\u00e3o podemos dizer que o cr\u00f3mio-molibd\u00e9nio ou o cr\u00f3mio-van\u00e1dio s\u00e3o melhores. Tanto o Cr-Mo como o Cr-V s\u00e3o uma excelente escolha para todas as utiliza\u00e7\u00f5es normais de chaves, chaves de caixa manuais, chaves de impacto, roquetes e outras ferramentas semelhantes. A diferen\u00e7a metal\u00fargica entre o Cr-Mo e o Cr-V \u00e9 insignificante nestas aplica\u00e7\u00f5es. Em vez disso, a consist\u00eancia do material, a geometria da ferramenta, a dureza a que \u00e9 aquecida e a conce\u00e7\u00e3o e implementa\u00e7\u00e3o do processo de fabrico controlam as diferen\u00e7as na qualidade das ferramentas manuais.<\/p>\n\n\n\n<p class=\"\">Por vezes, as ferramentas Cr-Mo custam mais do que as ferramentas Cr-V e os utilizadores de ferramentas querem saber a raz\u00e3o. A diferen\u00e7a de custo n\u00e3o se deve, normalmente, ao facto de um a\u00e7o ser melhor do que o outro. Devido \u00e0s capacidades de desempenho intr\u00ednseco semelhantes do Cr-Mo e do Cr-V, o custo mais elevado das ferramentas de Cr-Mo parece ser uma pr\u00e1tica de marketing que \u00e9 dif\u00edcil de justificar atrav\u00e9s da ci\u00eancia. As percep\u00e7\u00f5es tornam-se auto-realiz\u00e1veis, uma vez que os utilizadores de ferramentas esperam por vezes ver determinadas ligas em determinadas ferramentas. As cadeias de fornecimento criam-se em torno destas percep\u00e7\u00f5es e isso pode tornar uma liga de a\u00e7o muito mais econ\u00f3mica do que outra para um determinado produto.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>O que \u00e9 que a UF utiliza?<\/strong><\/h2>\n\n\n\n<p class=\"\">Na UF, utilizamos, entre outras, ligas das fam\u00edlias do cr\u00f3mio-molibd\u00e9nio e do cr\u00f3mio-van\u00e1dio para fabricar as nossas ferramentas. Uma vez estabelecidas as cadeias de fornecimento numa ind\u00fastria, pode ser mais eficiente n\u00e3o variar os tipos de a\u00e7o dentro dessas cadeias de fornecimento. Por exemplo, nas nossas cadeias de abastecimento nos EUA, o cr\u00f3mio-molibd\u00e9nio 4140 est\u00e1 mais facilmente dispon\u00edvel na forma de chapa laminada de que necessitamos para fabricar as nossas chaves de bocas angulares e o cr\u00f3mio-molibd\u00e9nio-n\u00edquel 8650 est\u00e1 mais facilmente dispon\u00edvel para fabricar as nossas chaves de fendas. Por raz\u00f5es semelhantes, algumas das nossas chaves de caixa manuais e de impacto fabricadas em Taiwan utilizam uma liga de 4140 Cr-Mo e outras utilizam uma liga de 50BV30 Cr-V. Em todos estes casos, as ligas cumprem todas as especifica\u00e7\u00f5es de desempenho, e a escolha resume-se \u00e0 din\u00e2mica da cadeia de fornecimento e ao custo.<\/p>\n\n\n\n<p class=\"\">O m\u00e9todo de fabrico tamb\u00e9m pode afetar a nossa sele\u00e7\u00e3o de materiais. Por exemplo, a varia\u00e7\u00e3o de cr\u00f3mio-van\u00e1dio chamada 50BV30 cont\u00e9m boro e funciona melhor para algumas ferramentas forjadas a frio. A adi\u00e7\u00e3o de boro permite que o a\u00e7o seja macio para o forjamento a frio e depois, ap\u00f3s o forjamento, altamente endurec\u00edvel atrav\u00e9s de tratamento t\u00e9rmico.<\/p>\n\n\n\n<p class=\"\">Se tiver d\u00favidas sobre a UFmaterials, contacte-nos.<\/p>","protected":false},"excerpt":{"rendered":"<p>Cr\u00f3mio-molibd\u00e9nio (tamb\u00e9m designado por cr\u00f3mio-molibd\u00e9nio, cr\u00f3mio-molibd\u00e9nio ou Cr-Mo) e cr\u00f3mio-van\u00e1dio (tamb\u00e9m designado por cr\u00f3mio-van\u00e1dio ou Cr-V) s\u00e3o nomes de duas fam\u00edlias de ligas de a\u00e7o utilizadas no fabrico de ferramentas manuais. Qual delas \u00e9 a melhor? Quando corretamente fabricadas e tratadas termicamente, s\u00e3o quimicamente quase id\u00eanticas e t\u00eam um desempenho semelhante. O que \u00e9 o a\u00e7o? O a\u00e7o \u00e9, em peso, [...]<\/p>","protected":false},"author":1,"featured_media":17947,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-17946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-repair"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chromium-Molybdenum or Chromium-Vanadium Steel Which is Better\uff1f<\/title>\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.uf-tools.com\/pt\/cromo-molibdenio-ou-cromo-vanadio-aco-que-e-melhor\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chromium-Molybdenum or Chromium-Vanadium Steel Which is Better\uff1f\" \/>\n<meta property=\"og:description\" content=\"Chromium-molybdenum (also called chrome molybdenum, chrome moly, or Cr-Mo) and chromium-vanadium (also called chrome vanadium or Cr-V) are names for two families of steel alloys used in hand tool manufacturing. Which one is better? When properly manufactured and heat treated, they are chemically almost identical and perform similarly. What is Steel? Steel is, by weight, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.uf-tools.com\/pt\/cromo-molibdenio-ou-cromo-vanadio-aco-que-e-melhor\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"UF Tools Wholesale Suppliers\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/UFTOOLS\/?show_switched_toast=0&amp;show_invite_to_follow=0&amp;show_switched_tooltip=0&amp;show_podcast_settings=0&amp;show_community_review_changes=0&amp;show_community_rollback=0&amp;show_follower_visibility_disclosure=0\" \/>\n<meta property=\"article:published_time\" content=\"2023-11-23T08:51:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-23T08:51:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.uf-tools.com\/wp-content\/uploads\/2023\/11\/\u5fae\u4fe1\u622a\u56fe_20231123165040.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"819\" \/>\n\t<meta property=\"og:image:height\" content=\"482\" \/>\n\t<meta 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class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.uf-tools.com\/chromium-molybdenum-or-chromium-vanadium-steel-which-is-better%ef%bc%9f\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.uf-tools.com\/chromium-molybdenum-or-chromium-vanadium-steel-which-is-better%ef%bc%9f\/\"},\"author\":{\"name\":\"Kevin\",\"@id\":\"http:\/\/www.uf-tools.com\/ja\/#\/schema\/person\/425294407519bf01193618df2fa9185a\"},\"headline\":\"Chromium-Molybdenum or Chromium-Vanadium Steel WHICH IS BETTER FOR HAND TOOLS?\",\"datePublished\":\"2023-11-23T08:51:49+00:00\",\"dateModified\":\"2023-11-23T08:51:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.uf-tools.com\/chromium-molybdenum-or-chromium-vanadium-steel-which-is-better%ef%bc%9f\/\"},\"wordCount\":1115,\"commentCount\":0,\"publisher\":{\"@id\":\"http:\/\/www.uf-tools.com\/ja\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.uf-tools.com\/chromium-molybdenum-or-chromium-vanadium-steel-which-is-better%ef%bc%9f\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.uf-tools.com\/wp-content\/uploads\/2023\/11\/\u5fae\u4fe1\u622a\u56fe_20231123165040.jpg\",\"articleSection\":[\"HOW TO 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