{"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\/fr\/inconel-625-vs-inconel-718\/","title":{"rendered":"Inconel 625 vs Inconel 718"},"content":{"rendered":"<p data-path-to-node=\"6\">Dans le domaine de la m\u00e9tallurgie extr\u00eame, <b><a href=\"https:\/\/www.nickelcasting.com\/pt\/ligas-de-niquel\/ligas-de-niquel-inconel\/inconel-625\/\">Inconel 625<\/a><\/b> et <b><a href=\"https:\/\/www.nickelcasting.com\/pt\/ligas-de-niquel\/ligas-de-niquel-inconel\/inconel-718\/\">Inconel 718<\/a><\/b> sont les normes industrielles pour les superalliages \u00e0 base de nickel. Bien qu'ils partagent une composition de base de nickel et de chrome, leurs m\u00e9canismes de renforcement microstructurels distincts dictent des applications tr\u00e8s diff\u00e9rentes.<\/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>r\u00e9sistance \u00e0 la corrosion<\/b> (625) contre <b>r\u00e9sistance m\u00e9canique<\/b> (718). Ce guide analyse les distinctions essentielles en mati\u00e8re de m\u00e9tallurgie, de stabilit\u00e9 thermique et d'usinabilit\u00e9.<\/p>\n<h2 data-path-to-node=\"8\">Comparaison entre l'Inconel 625 et l'Inconel 718<\/h2>\n<p data-path-to-node=\"9\">La diff\u00e9rence fondamentale r\u00e9side dans la mani\u00e8re dont ces alliages atteignent leur r\u00e9sistance.<\/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> est avant tout un <b>solide-solution renforc\u00e9e<\/b> Il s'agit d'un alliage de nickel-chrome. Il tire sa r\u00e9sistance de l'effet raidisseur du molybd\u00e8ne (Mo) et du niobium (Nb) dans la matrice nickel-chrome. Il ne n\u00e9cessite pas de traitement thermique de durcissement par vieillissement pour atteindre ses propri\u00e9t\u00e9s, conservant une excellente ductilit\u00e9 et soudabilit\u00e9.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"10,1,0\"><b>Inconel 718 (UNS N07718)<\/b> est un <b>durci par pr\u00e9cipitation<\/b> (durci par le temps). L'ajout de titane (Ti) et d'aluminium (Al), ainsi que de niobium, permet la formation de l'alliage 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>) pr\u00e9cipite (<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>) pendant le traitement thermique. Cette microstructure offre une limite d'\u00e9lasticit\u00e9 exceptionnellement \u00e9lev\u00e9e.<\/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\">Diff\u00e9rences de composition chimique<\/h3>\n<table data-path-to-node=\"12\">\n<thead>\n<tr>\n<td><strong>\u00c9l\u00e9ment<\/strong><\/td>\n<td><strong>Inconel 625 (Poids %)<\/strong><\/td>\n<td><strong>Inconel 718 (poids %)<\/strong><\/td>\n<td><strong>Impact sur les performances<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"12,1,0,0\"><b>Nickel (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\">Le 625 a une teneur en nickel plus \u00e9lev\u00e9e pour une meilleure r\u00e9sistance \u00e0 la corrosion.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,2,0,0\"><b>Chrome (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\">Les deux offrent une excellente r\u00e9sistance \u00e0 l'oxydation.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,3,0,0\"><b>Molybd\u00e8ne (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>Principale diff\u00e9rence :<\/b> La teneur \u00e9lev\u00e9e en Mo du 625 lui conf\u00e8re une r\u00e9sistance sup\u00e9rieure \u00e0 la corrosion par piq\u00fbre.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,4,0,0\"><b>Niobium (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\">Un taux plus \u00e9lev\u00e9 de Nb dans le 718 entra\u00eene une r\u00e9action de durcissement par pr\u00e9cipitation.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"12,5,0,0\"><b>Titane\/Aluminium<\/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>Propri\u00e9t\u00e9s m\u00e9caniques (temp\u00e9rature ambiante typique)<\/h3>\n<table data-path-to-node=\"14\">\n<thead>\n<tr>\n<td><strong>Propri\u00e9t\u00e9<\/strong><\/td>\n<td><strong>Inconel 625 (recuit)<\/strong><\/td>\n<td><strong>Inconel 718 (mis en solution + vieilli)<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"14,1,0,0\"><b>Limite d'\u00e9lasticit\u00e9 (d\u00e9calage de 0,2%)<\/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>R\u00e9sistance \u00e0 la traction<\/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>Duret\u00e9 (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>\u00c9longation<\/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>Verdict :<\/b> Si votre application exige une rigidit\u00e9 structurelle sous une charge extr\u00eame, l'Inconel 718 offre une limite d'\u00e9lasticit\u00e9 pr\u00e8s de deux fois sup\u00e9rieure \u00e0 celle du 625.<\/p>\n<h2 data-path-to-node=\"16\">Performance \u00e0 haute temp\u00e9rature de l'Inconel 625 par rapport \u00e0 l'Inconel 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. Rupture par fluage et stabilit\u00e9 de la r\u00e9sistance<\/h3>\n<p data-path-to-node=\"19\">L'Inconel 718 est le choix dominant pour les applications soumises \u00e0 des contraintes \u00e9lev\u00e9es, jusqu'\u00e0 <b>700\u00b0C (1300\u00b0F)<\/b>. A l'int\u00e9rieur de cette fourchette, le <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> bloquent efficacement le mouvement des dislocations, emp\u00eachant ainsi le fluage. Toutefois, au-del\u00e0 de 700\u00b0C, ces pr\u00e9cipit\u00e9s deviennent instables et deviennent plus grossiers, ce qui entra\u00eene une chute rapide de la r\u00e9sistance m\u00e9canique.<\/p>\n<h3 data-path-to-node=\"20\">2. Stabilit\u00e9 \u00e0 l'oxydation et \u00e0 la chaleur<\/h3>\n<p data-path-to-node=\"21\">L'Inconel 625 pr\u00e9sente une stabilit\u00e9 sup\u00e9rieure \u00e0 des temp\u00e9ratures tr\u00e8s \u00e9lev\u00e9es (jusqu'\u00e0 <b>982\u00b0C \/ 1800\u00b0F<\/b>). Comme il s'appuie sur le renforcement de la solution solide plut\u00f4t que sur les pr\u00e9cipit\u00e9s, il ne souffre pas des m\u00eames probl\u00e8mes d'usure que le 718. Pour les composants non charg\u00e9s ou \u00e0 faible contrainte expos\u00e9s \u00e0 une chaleur extr\u00eame (comme les conduits d'\u00e9chappement ou les torch\u00e8res), le 625 est l'option la plus s\u00fbre.<\/p>\n<h3 data-path-to-node=\"22\">3. Performances cryog\u00e9niques<\/h3>\n<p data-path-to-node=\"23\">Les deux alliages sont excellents pour la cryog\u00e9nie, mais l'Inconel 718 est souvent pr\u00e9f\u00e9r\u00e9 pour les boulons cryog\u00e9niques et les boulons en acier inoxydable. <a href=\"https:\/\/www.nickelcasting.com\/pt\/product-forms\/fasteners\/\">fixations<\/a> parce qu'il conserve sa grande r\u00e9sistance \u00e0 la traction sans devenir cassant \u00e0 des temp\u00e9ratures proches du z\u00e9ro absolu.<\/p>\n<h2 data-path-to-node=\"24\">Inconel 625 vs 718 Comment choisir<\/h2>\n<p data-path-to-node=\"25\">Pour rationaliser la d\u00e9cision d'achat, \u00e9valuez les trois contraintes suivantes :<\/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\">Sc\u00e9nario A : Corrosion extr\u00eame (marine et chimique)<\/h3>\n<p data-path-to-node=\"27\"><b>Choisissez l'Inconel 625.<\/b> La teneur \u00e9lev\u00e9e en molybd\u00e8ne (9%) conf\u00e8re \u00e0 l'acier 625 un indice \u00e9quivalent de r\u00e9sistance \u00e0 la piq\u00fbre (PREN) nettement sup\u00e9rieur \u00e0 celui de l'acier 718. Il est pratiquement immunis\u00e9 contre les fissures de corrosion sous contrainte dues aux ions chlorure.<\/p>\n<ul data-path-to-node=\"28\">\n<li>\n<p data-path-to-node=\"28,0,0\"><i>Applications typiques :<\/i> Tuyauterie sous-marine, \u00e9changeurs de chaleur dans le traitement des acides, syst\u00e8mes d'\u00e9chappement navals.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"29\">Sc\u00e9nario B : Charges statiques\/cycliques \u00e9lev\u00e9es (a\u00e9rospatiale et \u00e9nergie)<\/h3>\n<p data-path-to-node=\"30\"><b>Choisissez l'Inconel 718.<\/b> Lorsqu'une pi\u00e8ce doit r\u00e9sister \u00e0 des r\u00e9gimes \u00e9lev\u00e9s ou \u00e0 la pression sans se d\u00e9former, la limite d'\u00e9lasticit\u00e9 du 718 n'est pas n\u00e9gociable.<\/p>\n<ul data-path-to-node=\"31\">\n<li>\n<p data-path-to-node=\"31,0,0\"><i>Applications typiques :<\/i> Aubes de turbines \u00e0 gaz, rotors de turbocompresseurs, soupapes \u00e0 haute pression, chambres de pouss\u00e9e de moteurs de fus\u00e9es.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"32\">Sc\u00e9nario C : Fabrication et soudabilit\u00e9<\/h3>\n<p data-path-to-node=\"33\"><b>Choisissez l'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\">Questions et r\u00e9ponses connexes<\/h2>\n<p data-path-to-node=\"36\"><b>1. Quel est l'alliage le plus difficile \u00e0 usiner, l'Inconel 625 ou 718 ?<\/b> L'Inconel 718 est g\u00e9n\u00e9ralement plus difficile \u00e0 usiner. En raison de sa capacit\u00e9 de durcissement par pr\u00e9cipitation, il se durcit rapidement pendant la coupe, ce qui entra\u00eene des efforts de coupe plus importants et une dur\u00e9e de vie plus courte de l'outil par rapport \u00e0 l'Inconel 625 recuit.<\/p>\n<p data-path-to-node=\"37\"><b>2. L'Inconel 625 peut-il \u00eatre utilis\u00e9 comme m\u00e9tal d'apport pour le soudage de l'Inconel 718 ?<\/b> Oui. Le m\u00e9tal d'apport Inconel 625 (ERNiCrMo-3) est fr\u00e9quemment utilis\u00e9 pour souder des composants en Inconel 718, en particulier lorsque la soudure n\u00e9cessite une ductilit\u00e9 et une r\u00e9sistance \u00e0 la corrosion \u00e9lev\u00e9es afin d'\u00e9viter la fissuration dans la zone affect\u00e9e thermiquement (HAZ).<\/p>\n<p data-path-to-node=\"38\"><b>3. L'Inconel 718 est-il magn\u00e9tique ?<\/b> Non, l'Inconel 625 et l'Inconel 718 sont tous deux amagn\u00e9tiques. Cependant, un travail \u00e0 froid intensif ou des traitements thermiques sp\u00e9cifiques peuvent parfois induire une tr\u00e8s l\u00e9g\u00e8re perm\u00e9abilit\u00e9 magn\u00e9tique, mais pour la plupart des applications techniques, ils sont consid\u00e9r\u00e9s comme non magn\u00e9tiques.<\/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\u2026","_links":{"self":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/1802","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/comments?post=1802"}],"version-history":[{"count":2,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/1802\/revisions"}],"predecessor-version":[{"id":2552,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/1802\/revisions\/2552"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/media\/1803"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/media?parent=1802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/categories?post=1802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/tags?post=1802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}