{"id":1753,"date":"2025-12-01T07:55:14","date_gmt":"2025-12-01T06:55:14","guid":{"rendered":"https:\/\/www.nickelcasting.com\/?p=1753"},"modified":"2026-01-30T03:07:49","modified_gmt":"2026-01-30T02:07:49","slug":"what-is-the-difference-between-625-and-725-alloy","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/de\/what-is-the-difference-between-625-and-725-alloy\/","title":{"rendered":"Was ist der Unterschied zwischen den Legierungen 625 und 725?"},"content":{"rendered":"<p data-path-to-node=\"17\">Sie haben zwar einen nahezu identischen genetischen Code in Bezug auf die Korrosionsbest\u00e4ndigkeit, doch der Unterschied liegt ausschlie\u00dflich darin, wie sie mit mechanischer Belastung umgehen.<\/p>\n<p data-path-to-node=\"17\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-1754 aligncenter\" src=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13.jpg\" alt=\"\" width=\"1200\" height=\"675\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13.jpg 1200w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-300x169.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-1024x576.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-768x432.jpg 768w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-18x10.jpg 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h2>Chemische Zusammensetzung<\/h2>\n<p data-path-to-node=\"19\">Um den Unterschied zu verstehen, m\u00fcssen wir uns zun\u00e4chst mit der Chemie befassen. Die Legierung 625 ist eine Nickel-Chrom-Molybd\u00e4n-Legierung mit Niob. Diese Kombination bietet eine hervorragende Best\u00e4ndigkeit gegen Lochfra\u00df und Spaltkorrosion.<\/p>\n<p data-path-to-node=\"20\"><b>Legierung 725 (UNS N07725)<\/b> ist im Wesentlichen Alloy 625 mit einer spezifischen Modifikation. Metallurgen nahmen die bew\u00e4hrte korrosionsbest\u00e4ndige Basis von 625 und f\u00fcgten kleine, pr\u00e4zise Mengen von <b>Titan (Ti) und Aluminium (Al)<\/b>.<\/p>\n<ul data-path-to-node=\"21\">\n<li>\n<p data-path-to-node=\"21,0,0\"><b>Legierung 625:<\/b> Verst\u00e4rkt vor allem durch die versteifende Wirkung von Molybd\u00e4n und Niob in der Nickel-Chrom-Matrix (Festigkeitssteigerung durch Mischkristalle).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,1,0\"><b>Legierung 725:<\/b> Verfestigt durch die Ausscheidung von mikroskopischen Gamma-Kalk- und Gamma-Doppelkalk-Phasen w\u00e4hrend der W\u00e4rmebehandlung (Ausscheidungsh\u00e4rtung).<\/p>\n<\/li>\n<\/ul>\n<h2>Der Kernunterschied: Streckgrenze<\/h2>\n<p data-path-to-node=\"23\">Wenn die Korrosionsbest\u00e4ndigkeit das Schild ist, ist die Streckgrenze der Muskel. Dies ist der Punkt, an dem die <b>Unterschied zwischen den Legierungen 625 und 725<\/b> wird unbestreitbar.<\/p>\n<p data-path-to-node=\"24\">Alloy 625 is tough, but in its annealed state, its yield strength is typically around 60-70 ksi (414-483 MPa). To make it stronger, it must be &#8220;cold worked&#8221; (physically compressed or drawn), which limits the shapes and sizes you can produce.<\/p>\n<p data-path-to-node=\"25\">Die Legierung 725 ver\u00e4ndert das Spiel. Aufgrund des hinzugef\u00fcgten Titans und Aluminiums kann es w\u00e4rmebehandelt (gealtert) werden, um eine extrem hohe Festigkeit zu erreichen, ohne dass eine Kaltbearbeitung erforderlich ist. <b>Die Legierung 725 erreicht routinem\u00e4\u00dfig Streckgrenzen von mehr als 120 ksi (827 MPa) - etwa doppelt so hoch wie die von gegl\u00fchtem Alloy 625.<\/b><\/p>\n<p data-path-to-node=\"26\">Damit ist Alloy 725 die beste Wahl f\u00fcr gro\u00dfe, komplexe Profile, die eine hohe Festigkeit erfordern, aber zu dick sind, um effektiv kaltverformt zu werden.<\/p>\n<h2>Korrosionsbest\u00e4ndigkeit<\/h2>\n<p data-path-to-node=\"28\">Engineers often fear that increasing strength means sacrificing corrosion resistance. Fortunately, with these two alloys, that isn&#8217;t the case.<\/p>\n<p data-path-to-node=\"29\">Denn die Grundchemie (hoher Nickel- und Molybd\u00e4ngehalt) bleibt gleich, <b>Die Legierung 725 weist im Wesentlichen die gleiche Korrosionsbest\u00e4ndigkeit auf wie die Legierung 625.<\/b> Beide Legierungen bieten eine au\u00dfergew\u00f6hnliche Best\u00e4ndigkeit gegen:<\/p>\n<ul data-path-to-node=\"30\">\n<li>\n<p data-path-to-node=\"30,0,0\">Meerwasser und Meeresumwelt.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"30,1,0\">Lochfra\u00df und Spaltkorrosion.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"30,2,0\">Sulfidische Spannungsrissbildung (SSC).<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"31\">Diese einzigartige Kombination stellt Alloy 725 in eine besondere Kategorie: Es bietet die Korrosionsbest\u00e4ndigkeit von 625 mit der Festigkeit von Alloy 718.<\/p>\n<h2>Anwendungsszenarien: Wann sollte man was verwenden?<\/h2>\n<p data-path-to-node=\"33\">Die Wahl zwischen ihnen h\u00e4ngt in der Regel von der mechanischen Belastung der Anwendung ab.<\/p>\n<p data-path-to-node=\"34\"><b>W\u00e4hlen Sie Alloy 625, wenn:<\/b><\/p>\n<ul data-path-to-node=\"35\">\n<li>\n<p data-path-to-node=\"35,0,0\">Sie brauchen eine hervorragende Verarbeitbarkeit und Schwei\u00dfbarkeit.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"35,1,0\">Dabei handelt es sich um Verkleidungen (\u00dcberz\u00fcge) oder Blechkomponenten wie Abluftkan\u00e4le.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"35,2,0\">Extreme Streckgrenze ist nicht die Hauptanforderung.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"36\"><b>W\u00e4hlen Sie Alloy 725, wenn:<\/b><\/p>\n<ul data-path-to-node=\"37\">\n<li>\n<p data-path-to-node=\"37,0,0\">You are designing <a href=\"https:\/\/www.nickelcasting.com\/pt\/product-forms\/fasteners\/\">Verbindungselemente<\/a>, hangers, or landing nipples for Sour Gas service (NACE MR0175).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"37,1,0\">Das Material muss massiven Zugbelastungen in Meeresumgebungen standhalten.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"37,2,0\">Bei dem Bauteil handelt es sich um eine Stange oder ein Schmiedest\u00fcck mit gro\u00dfem Querschnitt, bei dem eine Kaltbearbeitung nicht m\u00f6glich ist.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"39\"><img decoding=\"async\" class=\"size-full wp-image-1416 aligncenter\" src=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/11\/suoluetu.jpg\" alt=\"\" width=\"1200\" height=\"675\" srcset=\"https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/11\/suoluetu.jpg 1200w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/11\/suoluetu-300x169.jpg 300w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/11\/suoluetu-1024x576.jpg 1024w, https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/11\/suoluetu-768x432.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h3>H\u00e4ufig gestellte Fragen (FAQs)<\/h3>\n<p data-path-to-node=\"42\"><b>F1: L\u00e4sst sich die Legierung 725 genauso leicht schwei\u00dfen wie die Legierung 625?<\/b><\/p>\n<p data-path-to-node=\"42\">Beide k\u00f6nnen zwar geschwei\u00dft werden, aber die Legierung 625 gilt im Allgemeinen als besser schwei\u00dfbar und wird h\u00e4ufig selbst als Schwei\u00dfzusatzwerkstoff verwendet. Die Legierung 725 kann geschwei\u00dft werden, aber da es sich um eine aush\u00e4rtbare Legierung handelt, muss sie in der Regel nach dem Schwei\u00dfen w\u00e4rmebehandelt werden, um ihre hochfesten Eigenschaften in der W\u00e4rmeeinflusszone wiederherzustellen.<\/p>\n<p data-path-to-node=\"43\"><b>F2: Ist Alloy 725 magnetisch?<\/b><\/p>\n<p data-path-to-node=\"43\">Wie Alloy 625 ist auch Alloy 725 eine Superlegierung auf Nickelbasis und unter allen Bedingungen unmagnetisch. Daher eignen sich beide Legierungen f\u00fcr Anwendungen, bei denen die magnetische Permeabilit\u00e4t minimiert werden muss, wie z. B. bei empfindlichen Elektronikgeh\u00e4usen oder U-Boot-Komponenten.<\/p>\n<p data-path-to-node=\"44\"><b>F3: Warum ist Alloy 725 teurer als 625?<\/b><\/p>\n<p data-path-to-node=\"44\">Der Kostenunterschied ergibt sich aus der Komplexit\u00e4t der Verarbeitung. W\u00e4hrend die Rohstoffkosten vergleichbar sind, erfordert die Legierung 725 ein pr\u00e4zises Vakuumschmelzen und l\u00e4ngere W\u00e4rmebehandlungszyklen (L\u00f6sungsgl\u00fchen plus zweistufige Alterung), um ihre mechanischen Eigenschaften zu erreichen. Au\u00dferdem wird die Legierung 625 in viel gr\u00f6\u00dferen Mengen hergestellt, was Gr\u00f6\u00dfenvorteile bietet.<\/p>","protected":false},"excerpt":{"rendered":"<p>While they share a nearly identical genetic code regarding corrosion resistance, the distinction lies entirely in how they handle mechanical stress. Chemical Composition To understand the difference, we must first look at the chemistry. Alloy 625 is a nickel-chromium-molybdenum alloy containing niobium. This combination delivers outstanding resistance to pitting and crevice corrosion. Alloy 725 (UNS [&hellip;]<\/p>","protected":false},"author":1,"featured_media":1754,"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-1753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"spectra_custom_meta":{"_edit_lock":["1769738869:1"],"_edit_last":["1"],"_thumbnail_id":["1754"],"_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"],"_yoast_wpseo_primary_category":["3"],"_yoast_wpseo_focuskw":["What is the difference between 625 and 725 alloy"],"_yoast_wpseo_title":["%%title%% %%page%% %%sep%% 28Nickel"],"_yoast_wpseo_metadesc":["What is the difference between 625 and 725 alloy? While chemically similar, Alloy 725 offers significantly higher strength through precipitation hardening."],"_yoast_wpseo_linkdex":["70"],"_yoast_wpseo_content_score":["90"],"_yoast_wpseo_estimated-reading-time-minutes":["4"],"rank_math_primary_category":["3"],"rank_math_title":["%title% %page% %sep% 28Nickel"],"rank_math_description":["What is the difference between 625 and 725 alloy? While chemically similar, Alloy 725 offers significantly higher strength through precipitation hardening."],"rank_math_focus_keyword":["What is the difference between 625 and 725 alloy"],"rank_math_news_sitemap_robots":["index"],"rank_math_robots":["a:1:{i:0;s:5:\"index\";}"],"rank_math_seo_score":["55"],"rank_math_internal_links_processed":["1"],"ilj_blacklistdefinition":["a:0:{}"],"ilj_linkdefinition":["a:1:{i:0;s:48:\"What is the difference between 625 and 725 alloy\";}"],"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:\"1775384825\";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-1753.css"]},"uagb_featured_image_src":{"full":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13.jpg",1200,675,false],"thumbnail":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-150x150.jpg",150,150,true],"medium":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-300x169.jpg",300,169,true],"medium_large":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-768x432.jpg",768,432,true],"large":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-1024x576.jpg",1024,576,true],"1536x1536":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13.jpg",1200,675,false],"2048x2048":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13.jpg",1200,675,false],"trp-custom-language-flag":["https:\/\/www.nickelcasting.com\/wp-content\/uploads\/2025\/12\/13-18x10.jpg",18,10,true]},"uagb_author_info":{"display_name":"nickel","author_link":"https:\/\/www.nickelcasting.com\/de\/author\/nickel\/"},"uagb_comment_info":0,"uagb_excerpt":"While they share a nearly identical genetic code regarding corrosion resistance, the distinction lies entirely in how they handle mechanical stress. Chemical Composition To understand the difference, we must first look at the chemistry. Alloy 625 is a nickel-chromium-molybdenum alloy containing niobium. This combination delivers outstanding resistance to pitting and crevice corrosion. Alloy 725 (UNS&hellip;","_links":{"self":[{"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/posts\/1753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/comments?post=1753"}],"version-history":[{"count":2,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/posts\/1753\/revisions"}],"predecessor-version":[{"id":2555,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/posts\/1753\/revisions\/2555"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/media\/1754"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/media?parent=1753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/categories?post=1753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/de\/wp-json\/wp\/v2\/tags?post=1753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}