{"id":2469,"date":"2026-01-24T07:57:10","date_gmt":"2026-01-24T06:57:10","guid":{"rendered":"https:\/\/www.nickelcasting.com\/?p=2469"},"modified":"2026-01-30T02:59:56","modified_gmt":"2026-01-30T01:59:56","slug":"inconel-625-vs-incoloy-825","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/fr\/inconel-625-vs-incoloy-825\/","title":{"rendered":"Inconel 625 vs Incoloy 825"},"content":{"rendered":"

Dans le monde de la m\u00e9tallurgie de haute performance, le choix entre Inconel 625<\/a> (UNS N06625) et Incoloy 825<\/a> (UNS N08825) est une d\u00e9cision cruciale pour les ing\u00e9nieurs travaillant dans des environnements difficiles. Bien que ces deux superalliages \u00e0 base de nickel soient con\u00e7us pour lutter contre la corrosion extr\u00eame, leurs compositions chimiques, leurs r\u00e9sistances m\u00e9caniques et leurs structures de co\u00fbts diff\u00e8rent consid\u00e9rablement.<\/p>\n

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Comparaison entre 625 et 825 : Composition chimique et propri\u00e9t\u00e9s<\/h2>\n

La diff\u00e9rence fondamentale entre ces deux alliages r\u00e9side dans leur teneur en nickel et en fer. L'Inconel 625 est un alliage de nickel-chrome-molybd\u00e8ne auquel on a ajout\u00e9 du niobium, qui agit comme un renfor\u00e7ateur de la solution solide. En revanche, l'Incoloy 825 est un alliage nickel-fer-chrome auquel ont \u00e9t\u00e9 ajout\u00e9s du cuivre et du titane, ce qui le rend plus rentable en raison de sa teneur en fer plus \u00e9lev\u00e9e.<\/p>\n

Principales sp\u00e9cifications techniques<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Propri\u00e9t\u00e9<\/td>\nInconel 625 (UNS N06625)<\/td>\nIncoloy 825 (UNS N08825)<\/td>\n<\/tr>\n<\/thead>\n
Teneur en nickel<\/td>\n58.0% min<\/td>\n38.0% – 46.0%<\/td>\n<\/tr>\n
Teneur en fer<\/td>\n5,0% max<\/td>\n22.0% min (Balance)<\/td>\n<\/tr>\n
Chrome<\/td>\n20.0% – 23.0%<\/td>\n19.5% – 23.5%<\/td>\n<\/tr>\n
Molybd\u00e8ne<\/td>\n8.0% – 10.0%<\/td>\n2.5% – 3.5%<\/td>\n<\/tr>\n
Niobium (+Ta)<\/td>\n3.15% – 4.15%<\/td>\nN\/A<\/td>\n<\/tr>\n
R\u00e9sistance \u00e0 la traction (psi)<\/td>\n120,000<\/td>\n85,000<\/td>\n<\/tr>\n
Principal avantage<\/td>\nHaute r\u00e9sistance et r\u00e9sistance \u00e0 la fatigue<\/td>\nExcellente r\u00e9sistance \u00e0 l'acide et rentabilit\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

625 vs 825 pour la corrosion par les chlorures<\/h2>\n

Lors de l'\u00e9valuation de la corrosion par le chlorure entre 625 et 825, l'indice \u00e9quivalent de r\u00e9sistance \u00e0 la piq\u00fbre (PREN) est la mesure la plus fiable.<\/p>\n

    \n
  • \n

    L'Inconel 625 a une teneur en molybd\u00e8ne beaucoup plus \u00e9lev\u00e9e (jusqu'\u00e0 10%), ce qui lui conf\u00e8re un PREN g\u00e9n\u00e9ralement sup\u00e9rieur \u00e0 45. Il est donc pratiquement insensible \u00e0 la corrosion par piq\u00fbres et crevasses induite par les chlorures dans les environnements d'eau de mer et de saumure. Il s'agit de l'\u00e9talon-or pour les zones d'\u00e9claboussures en mer et le mat\u00e9riel marin.<\/p>\n<\/li>\n

  • \n

    L'Incoloy 825 a un PREN compris entre 26 et 32. Bien qu'il offre une excellente r\u00e9sistance \u00e0 la corrosion sous contrainte (SCC) gr\u00e2ce \u00e0 sa teneur en nickel, il est plus sensible aux piq\u00fbres localis\u00e9es dans les eaux stagnantes \u00e0 forte teneur en chlorure que l'alliage 625. Cependant, l'ajout de cuivre dans l'alliage 825 lui conf\u00e8re une sup\u00e9riorit\u00e9 unique dans le traitement de l'acide sulfurique et de l'acide phosphorique.<\/p>\n<\/li>\n<\/ul>\n

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    625 ou 825 : Comment choisir le bon alliage<\/h2>\n

    Le dilemme \u201c625 vs 825 comment choisir\u201d se r\u00e9sume g\u00e9n\u00e9ralement \u00e0 trois facteurs : La temp\u00e9rature, la pression et le budget.<\/p>\n

      \n
    1. \n

      Exigences en mati\u00e8re de temp\u00e9rature : Si votre application d\u00e9passe 540\u00b0C (1000\u00b0F), l'Inconel 625 est le choix obligatoire. Sa matrice renforc\u00e9e au niobium maintient une r\u00e9sistance \u00e9lev\u00e9e au fluage et \u00e0 la rupture \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es o\u00f9 l'Incoloy 825 pourrait se ramollir.<\/p>\n<\/li>\n

    2. \n

      Chargement m\u00e9canique : Pour les tuyauteries \u00e0 haute pression ou les soufflets soumis \u00e0 des contraintes cycliques, la r\u00e9sistance sup\u00e9rieure \u00e0 la traction et \u00e0 la fatigue du 625 justifie la prime.<\/p>\n<\/li>\n

    3. \n

      Consid\u00e9rations \u00e9conomiques : L'Incoloy 825 est nettement moins cher car il remplace une grande partie du nickel par du fer. Pour les tubes de fond de puits de p\u00e9trole et de gaz o\u00f9 de l'acide sulfurique ou du CO2 sont pr\u00e9sents mais o\u00f9 la r\u00e9sistance extr\u00eame \u00e0 la piq\u00fbre du 625 n'est pas requise, le 825 est la solution la plus \u201crentable\u201d.<\/p>\n<\/li>\n<\/ol>\n

      \n

      Questions et r\u00e9ponses connexes<\/h3>\n

      Q1 : L'Inconel 625 peut-il remplacer l'Incoloy 825 dans toutes les applications ? Techniquement, oui, en raison de sa solidit\u00e9 et de sa r\u00e9sistance \u00e0 la corrosion sup\u00e9rieures. Toutefois, cela est rarement le cas dans la pratique, car l'Inconel 625 est environ 2 \u00e0 3 fois plus cher.<\/p>\n

      Q2 : Quel est le meilleur alliage pour le soudage ? Les deux alliages pr\u00e9sentent une excellente soudabilit\u00e9. Cependant, l'Inconel 625 est fr\u00e9quemment utilis\u00e9 comme m\u00e9tal d'apport (comme l'ERNiCrMo-3) pour souder d'autres m\u00e9taux dissemblables en raison de sa teneur \u00e9lev\u00e9e en alliage et de sa r\u00e9sistance \u00e0 la fissuration.<\/p>\n

      Q3 : L'Incoloy 825 est-il meilleur pour l'acide sulfurique que l'Inconel 625 ? Oui. Gr\u00e2ce \u00e0 l'ajout sp\u00e9cifique de cuivre, l'Incoloy 825 offre une r\u00e9sistance exceptionnelle \u00e0 l'acide sulfurique \u00e0 diff\u00e9rentes concentrations, surpassant souvent l'Alliage 625 dans des environnements de traitement chimique sp\u00e9cialis\u00e9s.<\/p>","protected":false},"excerpt":{"rendered":"

      Dans le monde de la m\u00e9tallurgie de haute performance, le choix entre l'Inconel 625 (UNS N06625) et l'Incoloy 825 (UNS N08825) est une d\u00e9cision cruciale pour les ing\u00e9nieurs travaillant dans des environnements difficiles. Bien que ces deux superalliages \u00e0 base de nickel soient con\u00e7us pour lutter contre la corrosion extr\u00eame, leurs compositions chimiques, leurs r\u00e9sistances m\u00e9caniques et leurs structures de co\u00fbts diff\u00e8rent consid\u00e9rablement. Comparaison 625 vs 825 : Composition chimique et propri\u00e9t\u00e9s [...]<\/p>","protected":false},"author":1,"featured_media":2471,"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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2469","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"spectra_custom_meta":{"_edit_lock":["1769738399:1"],"_edit_last":["1"],"rank_math_internal_links_processed":["1"],"rank_math_seo_score":["59"],"rank_math_description":["Compare Inconel 625 vs Incoloy 825. Learn about chloride corrosion resistance, mechanical properties, and cost-effective selection for extreme environments."],"rank_math_focus_keyword":["inconel 625 vs incoloy 825"],"_thumbnail_id":["2471"],"_wp_page_template":["default"],"site-sidebar-layout":["default"],"ast-site-content-layout":["default"],"site-content-style":["default"],"site-sidebar-style":["default"],"theme-transparent-header-meta":["default"],"ilj_blacklistdefinition":["a:0:{}"],"ilj_linkdefinition":["a:1:{i:0;s:26:\"Inconel 625 vs Incoloy 825\";}"],"astra-migrate-meta-layouts":["set"],"_uag_page_assets":["a:9:{s:3:\"css\";s:263:\".uag-blocks-common-selector{z-index:var(--z-index-desktop) !important}@media (max-width: 976px){.uag-blocks-common-selector{z-index:var(--z-index-tablet) !important}}@media (max-width: 767px){.uag-blocks-common-selector{z-index:var(--z-index-mobile) !important}}\n\";s:2:\"js\";s:0:\"\";s:18:\"current_block_list\";a:8:{i:0;s:11:\"core\/search\";i:1;s:10:\"core\/group\";i:2;s:12:\"core\/heading\";i:3;s:17:\"core\/latest-posts\";i:4;s:20:\"core\/latest-comments\";i:5;s:13:\"core\/archives\";i:6;s:15:\"core\/categories\";i:7;s:10:\"core\/image\";}s:8:\"uag_flag\";b:0;s:11:\"uag_version\";s:10:\"1776556632\";s:6:\"gfonts\";a:0:{}s:10:\"gfonts_url\";s:0:\"\";s:12:\"gfonts_files\";a:0:{}s:14:\"uag_faq_layout\";b:0;}"],"_elementor_page_assets":["a:0:{}"],"_uag_css_file_name":["uag-css-2469.css"]},"uagb_featured_image_src":{"full":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81.jpg",1200,670,false],"thumbnail":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81-150x150.jpg",150,150,true],"medium":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81-300x168.jpg",300,168,true],"medium_large":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81-768x429.jpg",768,429,true],"large":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81-1024x572.jpg",1024,572,true],"1536x1536":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81.jpg",1200,670,false],"2048x2048":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81.jpg",1200,670,false],"trp-custom-language-flag":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/81-18x10.jpg",18,10,true]},"uagb_author_info":{"display_name":"nickel","author_link":"https:\/\/www.nickelcasting.com\/fr\/author\/nickel\/"},"uagb_comment_info":0,"uagb_excerpt":"In the world of high-performance metallurgy, choosing between Inconel 625 (UNS N06625) and Incoloy 825 (UNS N08825) is a critical decision for engineers working in harsh environments. While both are nickel-based superalloys designed to combat extreme corrosion, their chemical compositions, mechanical strengths, and cost structures differ significantly. 625 vs 825 Comparison: Chemical Composition and Properties\u2026","_links":{"self":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/2469","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=2469"}],"version-history":[{"count":2,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/2469\/revisions"}],"predecessor-version":[{"id":2473,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/2469\/revisions\/2473"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/media\/2471"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/media?parent=2469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/categories?post=2469"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/tags?post=2469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}