{"id":2426,"date":"2026-01-17T08:42:10","date_gmt":"2026-01-17T07:42:10","guid":{"rendered":"https:\/\/www.nickelcasting.com\/?p=2426"},"modified":"2026-01-30T03:02:13","modified_gmt":"2026-01-30T02:02:13","slug":"hastelloy-c276-vs-hastelloy-c22","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/fr\/hastelloy-c276-vs-hastelloy-c22\/","title":{"rendered":"Hastelloy C276 vs Hastelloy C22"},"content":{"rendered":"<p data-path-to-node=\"8\">Dans le monde des alliages de nickel-chrome-molybd\u00e8ne \u00e0 haute performance, deux noms dominent les conversations : Hastelloy C276 et <a href=\"https:\/\/www.nickelcasting.com\/pt\/ligas-de-niquel\/hastelloy-nickel-alloys\/hastelloy-c-22\/\">Hastelloy C22<\/a>. For engineers and procurement specialists in the chemical processing industry, distinguishing between these two &#8220;C-type&#8221; alloys is critical. While they share a lineage, their distinct chemical compositions dictate how they behave under severe corrosive stress.<\/p>\n<p data-path-to-node=\"9\">Ce guide pr\u00e9sente les nuances techniques et vous aide \u00e0 optimiser le choix des mat\u00e9riaux pour garantir la long\u00e9vit\u00e9 et la s\u00e9curit\u00e9.<\/p>\n<p data-path-to-node=\"9\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-2427\" src=\"http:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/61.jpg\" alt=\"\" width=\"1200\" height=\"655\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/61.jpg 1200w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/61-300x164.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/61-1024x559.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/61-768x419.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/61-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h2 data-path-to-node=\"10\">Diff\u00e9rences entre C276 et C22<\/h2>\n<p data-path-to-node=\"11\">The fundamental C276 vs C22 differences lie in their elemental &#8220;recipes.&#8221; While both are Ni-Cr-Mo superalloys designed to resist aggressive corrosion, the balance of Chromium (Cr) and Molybdenum (Mo) sets them apart.<\/p>\n<p data-path-to-node=\"12\">Hastelloy C276 (UNS N10276) is considered the &#8220;workhorse&#8221; of the industry. It relies on a high Molybdenum content (15-17%) and Tungsten (3-4.5%) to provide exceptional resistance to reducing environments (like hydrochloric acid). However, its Chromium content is lower (approx. 14.5-16.5%).<\/p>\n<p data-path-to-node=\"13\">L'Hastelloy C22 (UNS N06022), souvent consid\u00e9r\u00e9 comme une am\u00e9lioration, ajuste cet \u00e9quilibre. Il augmente le chrome \u00e0 environ 20-22.5% tout en diminuant l\u00e9g\u00e8rement le molybd\u00e8ne (12.5-14.5%).<\/p>\n<p data-path-to-node=\"14\">Pourquoi cela est-il important ?<\/p>\n<ul data-path-to-node=\"15\">\n<li>\n<p data-path-to-node=\"15,0,0\">R\u00e9sistance \u00e0 l'oxydation : La teneur plus \u00e9lev\u00e9e en chrome du C22 lui conf\u00e8re une r\u00e9sistance nettement sup\u00e9rieure aux milieux oxydants (tels que le chlore humide, les m\u00e9langes d'acide nitrique ou les sels ferriques) par rapport au C276.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"15,1,0\">Soudabilit\u00e9 : Les deux poss\u00e8dent une excellente soudabilit\u00e9, mais le C22 r\u00e9siste mieux \u00e0 la pr\u00e9cipitation des joints de grains dans la zone affect\u00e9e thermiquement par la soudure (HAZ), ce qui le rend l\u00e9g\u00e8rement plus robuste dans les conditions de soudage pour les usines \u00e0 processus multiples.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"16\">Pour quantifier ce ph\u00e9nom\u00e8ne, nous examinons l'indice \u00e9quivalent de r\u00e9sistance \u00e0 la piq\u00fbre (PREN).<\/p>\n<div data-path-to-node=\"17\">\n<div data-math=\"PREN = \\%Cr + 3.3(\\%Mo + 0.5\\%W) + 16\\%N\"><span aria-hidden=\"true\">PREN=%Cr+3.3(%Mo+0.5%W)+16%N<\/span><\/div>\n<\/div>\n<p data-path-to-node=\"18\">En g\u00e9n\u00e9ral, le C22 pr\u00e9sente un PREN plus \u00e9lev\u00e9, ce qui indique une meilleure r\u00e9sistance \u00e0 la corrosion localis\u00e9e par piq\u00fbres et crevasses dans des environnements stagnants \u00e0 forte teneur en chlorure.<\/p>\n<h2 data-path-to-node=\"19\">C276 vs C22 applications de traitement chimique<\/h2>\n<p data-path-to-node=\"20\">Lorsque l'on compare les applications de traitement chimique du C276 \u00e0 celles du C22, la d\u00e9cision d\u00e9pend g\u00e9n\u00e9ralement du flux d'acide sp\u00e9cifique et de la pr\u00e9sence d'oxydants.<\/p>\n<p data-path-to-node=\"21\">Hastelloy C276 est la norme pour :<\/p>\n<ul data-path-to-node=\"22\">\n<li>\n<p data-path-to-node=\"22,0,0\">Acides r\u00e9ducteurs purs : Il donne d'excellents r\u00e9sultats dans les environnements d'acides chlorhydrique et sulfurique o\u00f9 il n'y a pas d'agents oxydants.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"22,1,0\">P\u00e2tes et papiers : Les digesteurs et les usines de blanchiment utilisent souvent le C276.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"22,2,0\">Puits de gaz acide : Les environnements de fond de puits riches en <span aria-hidden=\"true\">H2S<\/span> (sulfure d'hydrog\u00e8ne) et <span aria-hidden=\"true\">CO2<\/span>.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"23\">Hastelloy C22 est le choix pr\u00e9f\u00e9r\u00e9 pour :<\/p>\n<ul data-path-to-node=\"24\">\n<li>\n<p data-path-to-node=\"24,0,0\">Fabrication de produits pharmaceutiques : Parce que le C22 est moins susceptible de se corroder et de contaminer les lots sensibles, il est la norme pour les cuves de r\u00e9action API (Active Pharmaceutical Ingredient).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"24,1,0\">Agrochemicals &amp; Pesticides: Production lines that switch between oxidizing and reducing steps (&#8220;swing&#8221; processes) require the versatility of C22.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"24,2,0\">\u00c9purateurs et d\u00e9sulfuration : Dans les syst\u00e8mes de d\u00e9sulfuration des gaz de combustion (FGD) o\u00f9 les liquides de lavage peuvent devenir tr\u00e8s acides et oxydants \u00e0 cause des cendres volantes, le C22 est plus performant que le C276.<\/p>\n<\/li>\n<\/ul>\n<h2 data-path-to-node=\"25\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-2428\" src=\"http:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/62.jpg\" alt=\"\" width=\"1200\" height=\"655\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/62.jpg 1200w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/62-300x164.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/62-1024x559.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/62-768x419.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2026\/01\/62-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/h2>\n<h2 data-path-to-node=\"25\">C276 vs C22 comment choisir<\/h2>\n<p data-path-to-node=\"26\">Determining C276 vs C22 how to choose requires a specific analysis of your process media. It is not always about buying the &#8220;better&#8221; alloy, but the &#8220;right&#8221; one.<\/p>\n<ol start=\"1\" data-path-to-node=\"27\">\n<li>\n<p data-path-to-node=\"27,0,0\">Analyser les oxydants : Si votre flux contient des ions ferriques (<span aria-hidden=\"true\">Fe3+<\/span>), les ions cuivres (<span aria-hidden=\"true\">Cu2+<\/span>), du chlore libre ou de l'acide nitrique, choisissez C22. Le C276 peut souffrir d'une d\u00e9faillance pr\u00e9matur\u00e9e dans ces conditions en raison de sa plus faible teneur en chrome.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"27,1,0\">Evaluate &#8220;Upset&#8221; Conditions: If your plant runs a consistent reducing acid stream, C276 is sufficient and cost-effective. However, if your process is prone to &#8220;upsets&#8221; (accidental air ingress or temperature spikes creating oxidizing conditions), C22 acts as an insurance policy.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"27,2,0\">Co\u00fbt et disponibilit\u00e9 : Historiquement, le C276 \u00e9tait nettement moins cher. Aujourd'hui, l'\u00e9cart de prix s'est r\u00e9duit, mais le C276 reste plus largement disponible en stock (feuilles, barres, etc.), <a href=\"https:\/\/www.nickelcasting.com\/pt\/product-forms\/flanges\/\">brides<\/a>). Si vous avez besoin d'une r\u00e9paration rapide pour une ligne de r\u00e9duction standard, le C276 est souvent la solution logistique la plus avantageuse.<\/p>\n<\/li>\n<\/ol>\n<hr data-path-to-node=\"28\" \/>\n<h3 data-path-to-node=\"29\">Questions et r\u00e9ponses connexes<\/h3>\n<p data-path-to-node=\"30\">Q1 : Puis-je souder de l'Hastelloy C22 \u00e0 du C276 ?<\/p>\n<p data-path-to-node=\"30\">R : Oui, le soudage dissemblable est courant. Vous devez g\u00e9n\u00e9ralement utiliser le m\u00e9tal d'apport de soudage ayant la teneur en alliage la plus \u00e9lev\u00e9e (surcompatibilit\u00e9). Dans ce cas, utilisez le m\u00e9tal d'apport C22 (ERNiCrMo-10) pour que le cordon de soudure ait une r\u00e9sistance \u00e0 la corrosion \u00e9gale ou sup\u00e9rieure \u00e0 celle du m\u00e9tal de base C276.<\/p>\n<p data-path-to-node=\"31\">Q2 : L'Hastelloy C22 est-il toujours meilleur que le C276 ?<\/p>\n<p data-path-to-node=\"31\">A: No. In purely reducing hydrochloric acid environments at specific concentrations and temperatures, the higher Molybdenum content in C276 can actually offer slightly better corrosion rates than C22. C22 is &#8220;better&#8221; specifically for mixed or oxidizing streams.<\/p>\n<p data-path-to-node=\"32\">Q3 : Comment les distinguer visuellement ?<\/p>\n<p data-path-to-node=\"32\">R : Il est impossible de les distinguer \u00e0 l'\u0153il nu ; les deux m\u00e9taux sont brillants et gris argent\u00e9. Vous devez utiliser un \u00e9quipement d'identification positive des mat\u00e9riaux (analyseur portable XRF) pour v\u00e9rifier le rapport chrome\/molybd\u00e8ne ou rechercher l'indice de chaleur et le rapport d'essai de l'usine (MTR).<\/p>","protected":false},"excerpt":{"rendered":"<p>In the world of high-performance nickel-chromium-molybdenum alloys, two names dominate the conversation: Hastelloy C276 and Hastelloy C22. For engineers and procurement specialists in the chemical processing industry, distinguishing between these two &#8220;C-type&#8221; alloys is critical. While they share a lineage, their distinct chemical compositions dictate how they behave under severe corrosive stress. This guide breaks 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c22"],"_thumbnail_id":["2427"],"_wp_page_template":["default"],"rank_math_internal_links_processed":["1"],"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:31:\"Hastelloy C276 vs Hastelloy C22\";}"],"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) 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the world of high-performance nickel-chromium-molybdenum alloys, two names dominate the conversation: Hastelloy C276 and Hastelloy C22. For engineers and procurement specialists in the chemical processing industry, distinguishing between these two &#8220;C-type&#8221; alloys is critical. While they share a lineage, their distinct chemical compositions dictate how they behave under severe corrosive stress. This guide breaks\u2026","_links":{"self":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/2426","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=2426"}],"version-history":[{"count":1,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/2426\/revisions"}],"predecessor-version":[{"id":2429,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/posts\/2426\/revisions\/2429"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/media\/2427"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/media?parent=2426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/categories?post=2426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/fr\/wp-json\/wp\/v2\/tags?post=2426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}