{"id":1802,"date":"2025-12-11T03:49:13","date_gmt":"2025-12-11T02:49:13","guid":{"rendered":"https:\/\/www.nickelcasting.com\/?p=1802"},"modified":"2026-01-30T03:04:22","modified_gmt":"2026-01-30T02:04:22","slug":"inconel-625-vs-inconel-718","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/pt\/inconel-625-vs-inconel-718\/","title":{"rendered":"Inconel 625 vs Inconel 718"},"content":{"rendered":"<p data-path-to-node=\"6\">No dom\u00ednio da metalurgia extrema, <b><a href=\"https:\/\/www.nickelcasting.com\/pt\/ligas-de-niquel\/ligas-de-niquel-inconel\/inconel-625\/\">Inconel 625<\/a><\/b> e <b><a href=\"https:\/\/www.nickelcasting.com\/pt\/ligas-de-niquel\/ligas-de-niquel-inconel\/inconel-718\/\">Inconel 718<\/a><\/b> s\u00e3o os padr\u00f5es da ind\u00fastria para as superligas \u00e0 base de n\u00edquel. Embora partilhem uma composi\u00e7\u00e3o de base de n\u00edquel e cr\u00f3mio, os seus mecanismos de refor\u00e7o microestrutural distintos determinam aplica\u00e7\u00f5es muito diferentes.<\/p>\n<p data-path-to-node=\"7\">For engineers and metallurgists, the choice between these two grades is rarely about &#8220;better&#8221; or &#8220;worse&#8221;\u2014it is about optimizing for <b>resist\u00eancia \u00e0 corros\u00e3o<\/b> (625) versus <b>resist\u00eancia mec\u00e2nica<\/b> (718). Este guia analisa as distin\u00e7\u00f5es cr\u00edticas em termos de metalurgia, estabilidade t\u00e9rmica e maquinabilidade.<\/p>\n<h2 data-path-to-node=\"8\">Compara\u00e7\u00e3o entre Inconel 625 e 718<\/h2>\n<p data-path-to-node=\"9\">A diferen\u00e7a fundamental reside na forma como estas ligas atingem a sua resist\u00eancia.<\/p>\n<ul data-path-to-node=\"10\">\n<li>\n<p data-path-to-node=\"10,0,0\"><b>Inconel 625 (UNS N06625)<\/b> \u00e9 principalmente um <b>solu\u00e7\u00e3o s\u00f3lida refor\u00e7ada<\/b> liga. A sua resist\u00eancia resulta do efeito de refor\u00e7o do molibd\u00e9nio (Mo) e do ni\u00f3bio (Nb) na matriz de n\u00edquel-cr\u00f3mio. N\u00e3o necessita de tratamentos t\u00e9rmicos de endurecimento por envelhecimento para atingir as suas propriedades, mantendo uma excelente ductilidade e soldabilidade.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"10,1,0\"><b>Inconel 718 (UNS N07718)<\/b> \u00e9 um <b>endurecido por precipita\u00e7\u00e3o<\/b> (endurecida pelo tempo). A adi\u00e7\u00e3o de tit\u00e2nio (Ti) e alum\u00ednio (Al), juntamente com o ni\u00f3bio, permite a forma\u00e7\u00e3o da liga Gamma Double Prime (<span class=\"math-inline\" data-math=\"\\gamma''\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">\u03b3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">\u2032\u2032<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>) precipita (<span class=\"math-inline\" data-math=\"Ni_3Nb\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">N<\/span><span class=\"mord\"><span class=\"mord mathnormal\">i<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">3<\/span><\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mord mathnormal\">N<\/span><span class=\"mord mathnormal\">b<\/span><\/span><\/span><\/span><\/span>) durante o tratamento t\u00e9rmico. Esta microestrutura proporciona um limite de elasticidade excecionalmente elevado.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"11\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-1803\" src=\"http:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/45.jpg\" alt=\"\" width=\"1024\" height=\"572\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/45.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/45-300x168.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/45-768x429.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/45-18x10.jpg 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/h3>\n<h3 data-path-to-node=\"11\">Diferen\u00e7as de composi\u00e7\u00e3o qu\u00edmica<\/h3>\n<table data-path-to-node=\"12\">\n<thead>\n<tr>\n<td><strong>Elemento<\/strong><\/td>\n<td><strong>Inconel 625 (Peso %)<\/strong><\/td>\n<td><strong>Inconel 718 (Peso %)<\/strong><\/td>\n<td><strong>Impacto no desempenho<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"12,1,0,0\"><b>N\u00edquel (Ni)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,1,1,0\">~58% (Min)<\/span><\/td>\n<td><span data-path-to-node=\"12,1,2,0\">~50 &#8211; 55%<\/span><\/td>\n<td><span data-path-to-node=\"12,1,3,0\">625 tem um Ni mais elevado para uma melhor resist\u00eancia \u00e0 corros\u00e3o.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,2,0,0\"><b>Cr\u00f3mio (Cr)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,2,1,0\">20 &#8211; 23%<\/span><\/td>\n<td><span data-path-to-node=\"12,2,2,0\">17 &#8211; 21%<\/span><\/td>\n<td><span data-path-to-node=\"12,2,3,0\">Ambos oferecem uma excelente resist\u00eancia \u00e0 oxida\u00e7\u00e3o.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,3,0,0\"><b>Molibd\u00e9nio (Mo)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,3,1,0\"><b>8 &#8211; 10%<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,3,2,0\">2.8 &#8211; 3.3%<\/span><\/td>\n<td><span data-path-to-node=\"12,3,3,0\"><b>Diferen\u00e7a fundamental:<\/b> O elevado teor de Mo no 625 confere uma resist\u00eancia superior \u00e0 corros\u00e3o.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,4,0,0\"><b>Ni\u00f3bio (Nb)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,4,1,0\">3.15 &#8211; 4.15%<\/span><\/td>\n<td><span data-path-to-node=\"12,4,2,0\"><b>4.75 &#8211; 5.5%<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,4,3,0\">O maior teor de Nb no 718 impulsiona a resposta de endurecimento por precipita\u00e7\u00e3o.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,5,0,0\"><b>Tit\u00e2nio\/Alum\u00ednio<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,5,1,0\">&lt; 0,4%<\/span><\/td>\n<td><span data-path-to-node=\"12,5,2,0\"><b>Ti: 0,65-1,15% \/ Al: 0,2-0,8%<\/b><\/span><\/td>\n<td><span data-path-to-node=\"12,5,3,0\">Essential for 718&#8217;s age-hardening process.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Propriedades mec\u00e2nicas (temperatura ambiente t\u00edpica)<\/h3>\n<table data-path-to-node=\"14\">\n<thead>\n<tr>\n<td><strong>Im\u00f3veis<\/strong><\/td>\n<td><strong>Inconel 625 (recozido)<\/strong><\/td>\n<td><strong>Inconel 718 (Solu\u00e7\u00e3o + Envelhecido)<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"14,1,0,0\"><b>Resist\u00eancia ao escoamento (0.2% Offset)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"14,1,1,0\">414 &#8211; 650 MPa<\/span><\/td>\n<td><span data-path-to-node=\"14,1,2,0\"><b>1034 &#8211; 1100 MPa<\/b><\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"14,2,0,0\"><b>Resist\u00eancia \u00e0 tra\u00e7\u00e3o<\/b><\/span><\/td>\n<td><span data-path-to-node=\"14,2,1,0\">827 &#8211; 1000 MPa<\/span><\/td>\n<td><span data-path-to-node=\"14,2,2,0\"><b>1240 &#8211; 1350 MPa<\/b><\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"14,3,0,0\"><b>Dureza (Rockwell)<\/b><\/span><\/td>\n<td><span data-path-to-node=\"14,3,1,0\">145 &#8211; 220 HB<\/span><\/td>\n<td><span data-path-to-node=\"14,3,2,0\">331 &#8211; 444 HB (36-44 HRC)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"14,4,0,0\"><b>Alongamento<\/b><\/span><\/td>\n<td><span data-path-to-node=\"14,4,1,0\">30 &#8211; 60% (High Ductility)<\/span><\/td>\n<td><span data-path-to-node=\"14,4,2,0\">12 &#8211; 21%<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-path-to-node=\"15\"><b>Veredicto:<\/b> Se a sua aplica\u00e7\u00e3o exigir rigidez estrutural sob carga extrema, o Inconel 718 fornece quase o dobro do limite de elasticidade do 625.<\/p>\n<h2 data-path-to-node=\"16\">Desempenho a altas temperaturas do Inconel 625 vs 718<\/h2>\n<p data-path-to-node=\"17\">Defining &#8220;high temperature&#8221; is critical when choosing between these alloys, as their performance curves diverge significantly past <b>650\u00b0C (1200\u00b0F)<\/b>.<\/p>\n<h3 data-path-to-node=\"18\">1. Rutura por flu\u00eancia e estabilidade da resist\u00eancia<\/h3>\n<p data-path-to-node=\"19\">O Inconel 718 \u00e9 a escolha dominante para aplica\u00e7\u00f5es de alta tens\u00e3o at\u00e9 <b>700\u00b0C (1300\u00b0F)<\/b>. Dentro deste intervalo, o <span class=\"math-inline\" data-math=\"\\gamma''\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\">\u03b3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">\u2032\u2032<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> bloqueiam eficazmente o movimento de desloca\u00e7\u00e3o, impedindo a flu\u00eancia. No entanto, acima de 700\u00b0C, estes precipitados tornam-se inst\u00e1veis e grosseiros, causando uma r\u00e1pida queda na resist\u00eancia mec\u00e2nica.<\/p>\n<h3 data-path-to-node=\"20\">2. Oxida\u00e7\u00e3o e estabilidade t\u00e9rmica<\/h3>\n<p data-path-to-node=\"21\">O Inconel 625 apresenta uma estabilidade superior a temperaturas ultra-altas (at\u00e9 <b>982\u00b0C \/ 1800\u00b0F<\/b>). Uma vez que se baseia no refor\u00e7o por solu\u00e7\u00e3o s\u00f3lida em vez de precipitados, n\u00e3o sofre dos mesmos problemas de engrossamento que o 718. Para componentes sem carga ou de baixa tens\u00e3o expostos a calor extremo (como condutas de escape ou chamin\u00e9s), o 625 \u00e9 a op\u00e7\u00e3o mais segura.<\/p>\n<h3 data-path-to-node=\"22\">3. Desempenho criog\u00e9nico<\/h3>\n<p data-path-to-node=\"23\">Ambas as ligas s\u00e3o excelentes para a criogenia, mas o Inconel 718 \u00e9 frequentemente preferido para parafusos criog\u00e9nicos e <a href=\"https:\/\/www.nickelcasting.com\/pt\/product-forms\/fasteners\/\">fixadores<\/a> porque mant\u00e9m a sua elevada resist\u00eancia \u00e0 tra\u00e7\u00e3o sem se tornar fr\u00e1gil a temperaturas pr\u00f3ximas do zero absoluto.<\/p>\n<h2 data-path-to-node=\"24\">Inconel 625 vs 718 Como escolher<\/h2>\n<p data-path-to-node=\"25\">Para racionalizar a decis\u00e3o de aquisi\u00e7\u00e3o, avaliar as tr\u00eas restri\u00e7\u00f5es seguintes:<\/p>\n<p data-path-to-node=\"25\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-1804\" src=\"http:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/46.jpg\" alt=\"\" width=\"1024\" height=\"572\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/46.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/46-300x168.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/46-768x429.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/46-18x10.jpg 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h3 data-path-to-node=\"26\">Cen\u00e1rio A: Corros\u00e3o extrema (marinha e qu\u00edmica)<\/h3>\n<p data-path-to-node=\"27\"><b>Escolha o Inconel 625.<\/b> O elevado teor de molibd\u00e9nio (9%) confere ao 625 um n\u00famero equivalente de resist\u00eancia \u00e0 corros\u00e3o (PREN) significativamente superior ao 718. \u00c9 praticamente imune \u00e0 fissura\u00e7\u00e3o por corros\u00e3o sob tens\u00e3o por i\u00f5es cloreto.<\/p>\n<ul data-path-to-node=\"28\">\n<li>\n<p data-path-to-node=\"28,0,0\"><i>Aplica\u00e7\u00f5es t\u00edpicas:<\/i> Tubagens submarinas, permutadores de calor no processamento de \u00e1cidos, sistemas de exaust\u00e3o naval.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"29\">Cen\u00e1rio B: Cargas est\u00e1ticas\/c\u00edclicas elevadas (Aeroespacial e Energia)<\/h3>\n<p data-path-to-node=\"30\"><b>Escolha o Inconel 718.<\/b> Quando uma pe\u00e7a tem de suportar RPMs elevadas ou press\u00e3o sem se deformar, o limite de elasticidade do 718 n\u00e3o \u00e9 negoci\u00e1vel.<\/p>\n<ul data-path-to-node=\"31\">\n<li>\n<p data-path-to-node=\"31,0,0\"><i>Aplica\u00e7\u00f5es t\u00edpicas:<\/i> L\u00e2minas de turbinas a g\u00e1s, rotores de turbocompressores, v\u00e1lvulas de alta press\u00e3o, c\u00e2maras de impulso de motores de foguet\u00f5es.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"32\">Cen\u00e1rio C: Fabrico e soldabilidade<\/h3>\n<p data-path-to-node=\"33\"><b>Escolha o Inconel 625.<\/b> Inconel 718 is susceptible to &#8220;strain-age cracking&#8221; during post-weld heat treatment if not handled precisely. In contrast, Inconel 625 is one of the most weldable superalloys available; it is resistant to intergranular cracking and requires no post-weld aging to restore corrosion resistance.<\/p>\n<h2 data-path-to-node=\"35\">Perguntas e respostas relacionadas<\/h2>\n<p data-path-to-node=\"36\"><b>1. Qual \u00e9 a liga mais dif\u00edcil de maquinar, Inconel 625 ou 718?<\/b> O Inconel 718 \u00e9 geralmente mais dif\u00edcil de maquinar. Devido \u00e0 sua capacidade de endurecimento por precipita\u00e7\u00e3o, endurece rapidamente durante o corte, levando a for\u00e7as de corte mais elevadas e a uma vida \u00fatil mais curta da ferramenta em compara\u00e7\u00e3o com o Inconel 625 recozido.<\/p>\n<p data-path-to-node=\"37\"><b>2. O Inconel 625 pode ser utilizado como metal de adi\u00e7\u00e3o para a soldadura do Inconel 718?<\/b> Sim. O metal de adi\u00e7\u00e3o Inconel 625 (ERNiCrMo-3) \u00e9 frequentemente utilizado para soldar componentes Inconel 718, especialmente quando a soldadura requer uma elevada ductilidade e resist\u00eancia \u00e0 corros\u00e3o para evitar a fissura\u00e7\u00e3o na Zona Afetada pelo Calor (ZAC).<\/p>\n<p data-path-to-node=\"38\"><b>3. O Inconel 718 \u00e9 magn\u00e9tico?<\/b> N\u00e3o, tanto o Inconel 625 como o 718 n\u00e3o s\u00e3o magn\u00e9ticos. No entanto, o trabalho a frio pesado ou tratamentos t\u00e9rmicos espec\u00edficos podem por vezes induzir uma permeabilidade magn\u00e9tica muito ligeira, mas para a maioria dos fins de engenharia, s\u00e3o considerados n\u00e3o magn\u00e9ticos.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the realm of extreme metallurgy, Inconel 625 and Inconel 718 stand as the industry standards for nickel-based superalloys. While they share a base composition of nickel and chromium, their distinct microstructural strengthening mechanisms dictate vastly different applications. For engineers and metallurgists, the choice between these two grades is rarely about &#8220;better&#8221; or &#8220;worse&#8221;\u2014it is [&hellip;]<\/p>","protected":false},"author":1,"featured_media":1803,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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the realm of extreme metallurgy, Inconel 625 and Inconel 718 stand as the industry standards for nickel-based superalloys. While they share a base composition of nickel and chromium, their distinct microstructural strengthening mechanisms dictate vastly different applications. For engineers and metallurgists, the choice between these two grades is rarely about &#8220;better&#8221; or &#8220;worse&#8221;\u2014it is&hellip;","_links":{"self":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts\/1802","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/comments?post=1802"}],"version-history":[{"count":2,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts\/1802\/revisions"}],"predecessor-version":[{"id":2552,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts\/1802\/revisions\/2552"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/media\/1803"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/media?parent=1802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/categories?post=1802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/tags?post=1802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}