{"id":1320,"date":"2026-02-14T09:00:00","date_gmt":"2026-02-14T09:00:00","guid":{"rendered":"https:\/\/www.ykyvalve.com\/?p=1320"},"modified":"2026-03-03T07:16:47","modified_gmt":"2026-03-03T07:16:47","slug":"cf8-vs-cf8m-vs-cf3m-gate-valve","status":"publish","type":"post","link":"https:\/\/www.ykyvalve.com\/pt\/blog\/material\/cf8-vs-cf8m-vs-cf3m-gate-valve\/","title":{"rendered":"V\u00e1lvula de gaveta CF8 vs. V\u00e1lvula de gaveta CF8M vs. V\u00e1lvula de gaveta CF3M"},"content":{"rendered":"<p class=\"wp-block-paragraph\">As v\u00e1lvulas de gaveta CF8, CF8M e CF3M s\u00e3o fabricadas com a\u00e7o inoxid\u00e1vel austen\u00edtico de alta qualidade para aplica\u00e7\u00f5es industriais, o que determina diretamente sua resist\u00eancia \u00e0 corros\u00e3o, vida \u00fatil e n\u00edvel de seguran\u00e7a.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este guia compara os tr\u00eas tipos mais comuns de a\u00e7o inoxid\u00e1vel fundido para v\u00e1lvulas de gaveta, incluindo sua composi\u00e7\u00e3o qu\u00edmica e <a href=\"https:\/\/www.ykyvalve.com\/pt\/certificates\/\" target=\"_blank\" rel=\"noreferrer noopener\">certifica\u00e7\u00f5es globais<\/a>. A escolha do material certo garante uma longa durabilidade. <a href=\"https:\/\/www.ykyvalve.com\/pt\/quality\/\" target=\"_blank\" rel=\"noreferrer noopener\">vida \u00fatil<\/a> e evita falhas do sistema.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Decodificando c\u00f3digos alfanum\u00e9ricos de marcas<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A primeira letra \u201cC\u201d: Identifica\u00e7\u00e3o do processo de fundi\u00e7\u00e3o (que \u00e9 diferente da forja \u201cAISI 304\u201d).\u00a0<\/li>\n\n\n\n<li>A segunda letra \u201cF\u201d: Liga austen\u00edtica \u00e0 base de ferro (sistema Fe-Cr-Ni).\u00a0<\/li>\n\n\n\n<li>Os n\u00fameros \u201c8\u201d ou \u201c3\u201d: \u201c8\u201d \u2192 Carbono padr\u00e3o (\u22640,08%) \u2192 Resist\u00eancia b\u00e1sica \u00e0 corros\u00e3o. J\u00e1 \u201c3\u201d \u2192 Carbono ultrabaixo (\u22640,03%) \u2192 Resist\u00eancia \u00e0 corros\u00e3o intergranular.<\/li>\n\n\n\n<li>O sufixo \u201cM\u201d indica a adi\u00e7\u00e3o de molibd\u00eanio, uma vers\u00e3o aprimorada que oferece maior resist\u00eancia \u00e0 corros\u00e3o por \u00edons cloreto.\u00a0<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Classes de forjamento equivalentes (refer\u00eancia fundamental para compradores)<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Graus de fundi\u00e7\u00e3o<\/td><td>Grau equivalente de forjados<\/td><td>Normas internacionais<\/td><td>Principais diferen\u00e7as&nbsp;<\/td><\/tr><tr><td>CF8<\/td><td>ASTM 304<\/td><td>ASTM A351<\/td><td>A estrutura da pe\u00e7a fundida \u00e9 mais grosseira e a resist\u00eancia \u00e0 press\u00e3o \u00e9 inferior a 10%.<\/td><\/tr><tr><td>CF8M<\/td><td>ASTM 316<\/td><td>EN 1.4408<\/td><td>O teor de molibd\u00eanio \u00e9 de 2\u20133%, melhorando a resist\u00eancia \u00e0 \u00e1gua do mar.<\/td><\/tr><tr><td>CF3M&nbsp;<\/td><td>ASTM 316L<\/td><td>ISO 4991<\/td><td>Baixo teor de carbono com molibd\u00eanio para forte resist\u00eancia \u00e0 corros\u00e3o e boa soldabilidade.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Compara\u00e7\u00e3o do conte\u00fado dos elementos principais (Norma ASTM A351)&nbsp;<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Elementos<\/td><td>CF8<\/td><td>CF8M<\/td><td>CF3M<\/td><td>Fun\u00e7\u00e3o e impacto<\/td><td>Linha vermelha cr\u00edtica e impacto no desempenho<\/td><\/tr><tr><td>Carbono (C)<\/td><td>\u22640,08%<\/td><td>\u22640,08%<\/td><td>\u22640,03%<\/td><td>Um maior teor de carbono aumenta a resist\u00eancia, mas reduz a durabilidade. <a href=\"https:\/\/www.ykyvalve.com\/pt\/blog\/application\/technical-considerations-for-high-temperature-valve-design\/\" target=\"_blank\" rel=\"noreferrer noopener\">corros\u00e3o intergranular<\/a>.<\/td><td>Acima de 0,03%: Maior risco de corros\u00e3o intergranular nas \u00e1reas de solda.&nbsp;<\/td><\/tr><tr><td>Cromo (Cr)<\/td><td>18.0-21.0%<\/td><td>18.0-21.0%<\/td><td>17.0-21.0%<\/td><td>Elementos essenciais para meios de oxida\u00e7\u00e3o resistentes.<\/td><td>Abaixo de 17%: A taxa de corros\u00e3o por \u00e1cido n\u00edtrico e ac\u00e9tico aumenta cerca de tr\u00eas vezes.&nbsp;<\/td><\/tr><tr><td>N\u00edquel (Ni)<\/td><td>8.0-11.0%<\/td><td>9.0-12.0%<\/td><td>9.0-13.0%<\/td><td>Estrutura austen\u00edtica est\u00e1vel com resist\u00eancia a \u00e1cidos aprimorada.<\/td><td>Abaixo de 8%: Maior probabilidade de fissuras por curvatura a frio.&nbsp;<\/td><\/tr><tr><td>Molibd\u00eanio (Mo)<\/td><td>N\u00e3o adicionado<\/td><td>2.0-3.0%<\/td><td>2.0-3.0%<\/td><td>Fundamental para a resist\u00eancia \u00e0 corros\u00e3o por pite (particularmente contra \u00edons cloreto).<\/td><td>Sem molibd\u00eanio: a vida \u00fatil contra corros\u00e3o por \u00e1gua do mar pode ser inferior a um ano.<\/td><\/tr><tr><td>Mangan\u00eas (Mn)<\/td><td>\u22641,50%<\/td><td>\u22641,50%<\/td><td>\u22641,50%<\/td><td>Aumenta a efici\u00eancia e a efic\u00e1cia da desoxida\u00e7\u00e3o.<\/td><td>Acima de 2%: A resist\u00eancia ao impacto diminui em torno de 30%.&nbsp;<\/td><\/tr><tr><td>Sil\u00edcio (Si)<\/td><td>\u22642,00%<\/td><td>\u22641,50%<\/td><td>\u22641,50%<\/td><td>Melhora a veda\u00e7\u00e3o e a resist\u00eancia \u00e0 corros\u00e3o.<\/td><td>Acima de 1,5%: Maior risco de porosidade na fundi\u00e7\u00e3o.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Observa\u00e7\u00e3o:&nbsp;<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>O baix\u00edssimo teor de carbono (C\u22640,03%) do CF3M \u00e9 o principal componente de sua propriedade anticorrosiva de soldagem.<\/em><\/li>\n\n\n\n<li><em>O teor de molibd\u00eanio do CF8M\/CF3M (Mo = 2-3%) determina a resist\u00eancia aos \u00edons cloreto.\u00a0<\/em><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Regras \u00fateis para compras&nbsp;<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Tipos de m\u00eddia<\/td><td>Elementos obrigat\u00f3rios<\/td><td>Notas recomendadas<\/td><td>Notas proibidas<\/td><\/tr><tr><td>\u00c1cido sulf\u00farico ou \u00e1cido ac\u00e9tico dilu\u00eddo<\/td><td>Cr\u226518%<\/td><td>CF8&nbsp;<\/td><td>\u2013<\/td><\/tr><tr><td>Solu\u00e7\u00e3o de \u00edons cloreto<\/td><td>Mo\u22652,0%<\/td><td>CF8M\/CF3M<\/td><td>CF8<\/td><\/tr><tr><td>Tubula\u00e7\u00e3o de soldagem de alta temperatura<\/td><td>C\u22640,03%<\/td><td>CF3M<\/td><td>CF8\/CF8M<\/td><\/tr><tr><td>\u00c1cido n\u00edtrico concentrado (\uff1e65%)<\/td><td>Cr\u226520%<\/td><td>A\u00e7o especial com alto teor de cromo<\/td><td>Todos os modelos da s\u00e9rie CF<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Nota: Desvios nos elementos podem causar falhas. Portanto, selecionar o a\u00e7o inoxid\u00e1vel adequado ao ambiente garante a seguran\u00e7a da tubula\u00e7\u00e3o.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Compara\u00e7\u00e3o detalhada de desempenho<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Resist\u00eancia \u00e0 corros\u00e3o: \u00edons cloreto vs. meio \u00e1cido&nbsp;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O papel decisivo do molibd\u00eanio (Mo), como nas condi\u00e7\u00f5es de trabalho em \u00e1gua do mar.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Material<\/td><td>\u00cdndice de Corros\u00e3o por Pite (PRE)<\/td><td>Concentra\u00e7\u00e3o permitida de \u00edons cloreto<\/td><td>Expectativa de vida t\u00edpica<\/td><\/tr><tr><td>CF8<\/td><td>18.5<\/td><td>\u2264200 ppm<\/td><td>1-2 anos (risco de perfura\u00e7\u00e3o)<\/td><\/tr><tr><td>CF8M<\/td><td>25.5<\/td><td>\u22645000 ppm<\/td><td>Mais de 15 anos<\/td><\/tr><tr><td>CF3M<\/td><td>25.5<\/td><td>\u22645000 ppm<\/td><td>Mais de 15 anos<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Resist\u00eancia mec\u00e2nica: Alta temperatura versus temperatura ambiente&nbsp;<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Material<\/td><td>resist\u00eancia \u00e0 tra\u00e7\u00e3o \u00e0 temperatura ambiente (MPa)<\/td><td>taxa de reten\u00e7\u00e3o de for\u00e7a de 538\u2103<\/td><td>temperatura de alerta cr\u00edtica<\/td><\/tr><tr><td>CF8<\/td><td>485<\/td><td>58%<\/td><td>\u2265425\u2103 precisam ter sua pot\u00eancia reduzida.<\/td><\/tr><tr><td>CF8M<\/td><td>485<\/td><td>55%<\/td><td>Igual ao CF8<\/td><\/tr><tr><td>CF3M<\/td><td>450<\/td><td>60%<\/td><td>Baixos n\u00edveis de carbono melhoram a plasticidade em altas temperaturas.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Limite de temperatura: Limite de seguran\u00e7a do material&nbsp;<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Dimens\u00e3o de desempenho<\/td><td>CF8\/CF8M<\/td><td>CF3M<\/td><td>Solu\u00e7\u00e3o inovadora<\/td><\/tr><tr><td>Limite de temperatura baixa<\/td><td>-196\u2103<\/td><td>-254\u2103<\/td><td>CF3M para v\u00e1lvula de foguete de oxig\u00eanio l\u00edquido<\/td><\/tr><tr><td>Oxida\u00e7\u00e3o em alta temperatura<\/td><td>870\u2103 (cont\u00ednuo)<\/td><td>870\u2103 (cont\u00ednuo)<\/td><td>Temperaturas acima de 870\u00b0C requerem HK40<\/td><\/tr><tr><td>ruptura por flu\u00eancia<\/td><td>425\u2103<\/td><td>425\u2103<\/td><td>Inconel 625 para sobrelimite<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Tabela Resumo de Desempenho&nbsp;<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Material<\/td><td>Resist\u00eancia \u00e0 corros\u00e3o da \u00e1gua do mar<\/td><td>soldabilidade<\/td><td>Resist\u00eancia a altas temperaturas<\/td><td>Rela\u00e7\u00e3o custo-benef\u00edcio<\/td><td>Cen\u00e1rios recomendados<\/td><\/tr><tr><td>CF8<\/td><td>1\/5 estrelas<\/td><td>2\/5 estrelas<\/td><td>3\/5 estrelas<\/td><td>5\/5 estrelas<\/td><td>Meio de cultura comum \u00e0 temperatura normal, sem cloro.<\/td><\/tr><tr><td>CF8M<\/td><td>5\/5 estrelas<\/td><td>2\/5 estrelas<\/td><td>3\/5 estrelas<\/td><td>3\/5 estrelas<\/td><td>\u00c1gua do mar ou fluidos de processo clorados<\/td><\/tr><tr><td>CF3M<\/td><td>5\/5 estrelas<\/td><td>5\/5 estrelas<\/td><td>4\/5 estrelas<\/td><td>3\/5 estrelas<\/td><td>Uma op\u00e7\u00e3o vers\u00e1til para condi\u00e7\u00f5es exigentes.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Certifica\u00e7\u00f5es Globais<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>ASTM<\/td><td>EN<\/td><td>ISO<\/td><td>JIS<\/td><td>GB<\/td><\/tr><tr><td>CF8<\/td><td>GX5CrNi19-10<\/td><td>\u2013<\/td><td>SCS13<\/td><td>022Cr19Ni10<\/td><\/tr><tr><td>CF8M<\/td><td>GX5CrNiMo19-11-2<\/td><td>CF-8M<\/td><td>SCS14A<\/td><td>022Cr17Ni12Mo2<\/td><\/tr><tr><td>CF3M<\/td><td>GX2CrNiMo19-11-2<\/td><td>\u2013<\/td><td>SCS16A<\/td><td>022Cr17Ni12Mo2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclus\u00e3o<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A escolha entre CF8, CF8M e CF3M depende muito de <a href=\"https:\/\/www.ykyvalve.com\/pt\/applications\/chemical-industry\/\" target=\"_blank\" rel=\"noreferrer noopener\">exposi\u00e7\u00e3o a produtos qu\u00edmicos<\/a> e necessidades de soldagem. A v\u00e1lvula de gaveta CF8 \u00e9 ideal para aplica\u00e7\u00f5es gerais com \u00e1gua e alimentos, enquanto as v\u00e1lvulas CF8M e CF3M resistem a ambientes \u00e1cidos e salinos. A escolha do material espec\u00edfico da v\u00e1lvula de gaveta em a\u00e7o inoxid\u00e1vel para cada aplica\u00e7\u00e3o evita reparos dispendiosos e garante a seguran\u00e7a.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A YKY fabrica uma variedade de <a href=\"https:\/\/www.ykyvalve.com\/pt\/product-category\/gate-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">v\u00e1lvulas de gaveta<\/a> em diversos tipos de a\u00e7o inoxid\u00e1vel. Nossas solu\u00e7\u00f5es s\u00e3o projetadas para garantir desempenho sem vazamentos em diferentes aplica\u00e7\u00f5es, incluindo oleodutos submarinos e equipamentos para campos petrol\u00edferos, proporcionando assim seguran\u00e7a energ\u00e9tica a longo prazo. Al\u00e9m disso, oferecemos v\u00e1lvulas prontas para envio com embalagem neutra e quantidade m\u00ednima de pedido flex\u00edvel para facilitar a escalabilidade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fa\u00e7a parceria com a YKY para obter fornecimento est\u00e1vel, or\u00e7amentos r\u00e1pidos e solu\u00e7\u00f5es de v\u00e1lvulas personalizadas.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.ykyvalve.com\/pt\/contact-us\/\" style=\"color:#fffbfb;background-color:#f6771c\" target=\"_blank\" rel=\"noreferrer noopener\">Solicite um or\u00e7amento gratuito<\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>The CF8 gate valve, CF8M gate valve, CF3M gate valve are the core austenitic stainless steel materials for industrial settings, which directly determine the corrosion resistance<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":1321,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[73],"tags":[],"class_list":["post-1320","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-material"],"_links":{"self":[{"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/posts\/1320","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/comments?post=1320"}],"version-history":[{"count":1,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/posts\/1320\/revisions"}],"predecessor-version":[{"id":1322,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/posts\/1320\/revisions\/1322"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/media\/1321"}],"wp:attachment":[{"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/media?parent=1320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/categories?post=1320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ykyvalve.com\/pt\/wp-json\/wp\/v2\/tags?post=1320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}