{"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\/ja\/what-is-the-difference-between-625-and-725-alloy\/","title":{"rendered":"625\u5408\u91d1\u3068725\u5408\u91d1\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p data-path-to-node=\"17\">\u8010\u98df\u6027\u306b\u95a2\u3057\u3066\u306f\u307b\u307c\u540c\u3058\u907a\u4f1d\u6697\u53f7\u3092\u5171\u6709\u3057\u3066\u3044\u308b\u304c\u3001\u305d\u306e\u9055\u3044\u306f\u6a5f\u68b0\u7684\u30b9\u30c8\u30ec\u30b9\u3078\u306e\u5bfe\u51e6\u306e\u4ed5\u65b9\u306b\u3042\u308b\u3002.<\/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>\u5316\u5b66\u7d44\u6210<\/h2>\n<p data-path-to-node=\"19\">\u3053\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u307e\u305a\u5316\u5b66\u7684\u6027\u8cea\u306b\u76ee\u3092\u5411\u3051\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u5408\u91d1625\u306f\u3001\u30cb\u30aa\u30d6\u3092\u542b\u3080\u30cb\u30c3\u30b1\u30eb-\u30af\u30ed\u30e0-\u30e2\u30ea\u30d6\u30c7\u30f3\u5408\u91d1\u3067\u3059\u3002\u3053\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u5b54\u98df\u3084\u9699\u9593\u8150\u98df\u306b\u5bfe\u3057\u3066\u5353\u8d8a\u3057\u305f\u8010\u6027\u3092\u767a\u63ee\u3057\u307e\u3059\u3002.<\/p>\n<p data-path-to-node=\"20\"><b>\u5408\u91d1725 (UNS N07725)<\/b> \u306f\u3001\u57fa\u672c\u7684\u306b\u5408\u91d1625\u306b\u7279\u6b8a\u306a\u6539\u826f\u3092\u52a0\u3048\u305f\u3082\u306e\u3067\u3042\u308b\u3002\u51b6\u91d1\u5b66\u8005\u306f\u3001625\u306e\u5b9f\u7e3e\u306e\u3042\u308b\u8010\u98df\u6027\u3092\u30d9\u30fc\u30b9\u306b\u3001\u5c11\u91cf\u3067\u6b63\u78ba\u306a\u91cf\u306e <b>\u30c1\u30bf\u30f3\uff08Ti\uff09\u3068\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\uff08Al\uff09<\/b>.<\/p>\n<ul data-path-to-node=\"21\">\n<li>\n<p data-path-to-node=\"21,0,0\"><b>\u30a2\u30ed\u30a4625<\/b> \u4e3b\u306b\u30cb\u30c3\u30b1\u30eb\u30fb\u30af\u30ed\u30e0\u30de\u30c8\u30ea\u30c3\u30af\u30b9\u4e2d\u306e\u30e2\u30ea\u30d6\u30c7\u30f3\u3068\u30cb\u30aa\u30d6\u306e\u525b\u6027\u52b9\u679c\u306b\u3088\u3063\u3066\u5f37\u5316\u3055\u308c\u308b\uff08\u56fa\u6eb6\u5f37\u5316\uff09\u3002.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,1,0\"><b>\u5408\u91d1725\uff1a<\/b> \u71b1\u51e6\u7406\u4e2d\u306b\u5fae\u7d30\u306a\u30ac\u30f3\u30de\u30d7\u30e9\u30a4\u30e0\u76f8\u3068\u30ac\u30f3\u30de\u30c0\u30d6\u30eb\u30d7\u30e9\u30a4\u30e0\u76f8\u304c\u6790\u51fa\u3059\u308b\u3053\u3068\u3067\u5f37\u5316\u3055\u308c\u308b\uff08\u6790\u51fa\u786c\u5316\uff09\u3002.<\/p>\n<\/li>\n<\/ul>\n<h2>\u30b3\u30a2\u306e\u9055\u3044\u964d\u4f0f\u5f37\u5ea6<\/h2>\n<p data-path-to-node=\"23\">\u8010\u98df\u6027\u304c\u76fe\u306a\u3089\u3001\u964d\u4f0f\u5f37\u5ea6\u306f\u7b4b\u8089\u3067\u3042\u308b\u3002\u3053\u3053\u304c <b>625\u5408\u91d1\u3068725\u5408\u91d1\u306e\u9055\u3044<\/b> \u306f\u5426\u5b9a\u3067\u304d\u306a\u304f\u306a\u308b\u3002.<\/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\">\u5408\u91d1725\u306f\u30b2\u30fc\u30e0\u3092\u5909\u3048\u307e\u3059\u3002\u30c1\u30bf\u30f3\u3068\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u304c\u6dfb\u52a0\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u51b7\u9593\u52a0\u5de5\u3092\u5fc5\u8981\u3068\u305b\u305a\u3001\u71b1\u51e6\u7406\uff08\u6642\u52b9\u51e6\u7406\uff09\u306b\u3088\u308a\u8d85\u9ad8\u5f37\u5ea6\u3092\u9054\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002. <b>\u5408\u91d1725\u306f\u3001\u65e5\u5e38\u7684\u306b120ksi\uff08827MPa\uff09\u3092\u8d85\u3048\u308b\u964d\u4f0f\u5f37\u5ea6\u3092\u9054\u6210\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306f\u713c\u920d\u3055\u308c\u305f\u5408\u91d1625\u306e\u307b\u307c2\u500d\u3067\u3042\u308b\u3002.<\/b><\/p>\n<p data-path-to-node=\"26\">\u3053\u306e\u305f\u3081\u3001\u5408\u91d1725\u306f\u3001\u9ad8\u5f37\u5ea6\u3092\u8981\u6c42\u3055\u308c\u308b\u3082\u306e\u306e\u3001\u539a\u3059\u304e\u3066\u51b7\u9593\u52a0\u5de5\u304c\u52b9\u679c\u7684\u306b\u884c\u3048\u306a\u3044\u5927\u578b\u3067\u8907\u96d1\u306a\u90e8\u4f4d\u306b\u9069\u3057\u305f\u512a\u308c\u305f\u9078\u629e\u80a2\u3068\u306a\u3063\u3066\u3044\u308b\u3002.<\/p>\n<h2>\u8010\u98df\u6027<\/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\">\u30d9\u30fc\u30b9\u3068\u306a\u308b\u5316\u5b66\u7684\u6027\u8cea\uff08\u9ad8\u30cb\u30c3\u30b1\u30eb\u3068\u30e2\u30ea\u30d6\u30c7\u30f3\uff09\u306f\u4e00\u8cab\u3057\u3066\u3044\u308b\u304b\u3089\u3060\u3001, <b>\u5408\u91d1725\u306f\u3001\u57fa\u672c\u7684\u306b\u5408\u91d1625\u3068\u540c\u3058\u8010\u98df\u6027\u3092\u4fdd\u6301\u3059\u308b\u3002.<\/b> \u4e21\u5408\u91d1\u3068\u3082\u512a\u308c\u305f\u8010\u6027\u3092\u6301\u3064\uff1a<\/p>\n<ul data-path-to-node=\"30\">\n<li>\n<p data-path-to-node=\"30,0,0\">\u6d77\u6c34\u3068\u6d77\u6d0b\u74b0\u5883\u3002.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"30,1,0\">\u5b54\u98df\u3068\u9699\u9593\u8150\u98df\u3002.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"30,2,0\">\u786b\u5316\u7269\u5fdc\u529b\u5272\u308c\uff08SSC\uff09\u3002.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"31\">625\u306e\u8010\u98df\u6027\u3068718\u306e\u5f37\u5ea6\u3092\u4f75\u305b\u6301\u3064\u3002.<\/p>\n<h2>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30b7\u30ca\u30ea\u30aa\u3044\u3064\u4f7f\u3046\uff1f<\/h2>\n<p data-path-to-node=\"33\">\u3053\u308c\u3089\u306e\u3069\u3061\u3089\u3092\u9078\u3076\u304b\u306f\u3001\u901a\u5e38\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6a5f\u68b0\u7684\u8ca0\u8377\u306b\u3088\u308b\u3002.<\/p>\n<p data-path-to-node=\"34\"><b>\u30a2\u30ed\u30a4625\u3092\u9078\u3076\u306a\u3089<\/b><\/p>\n<ul data-path-to-node=\"35\">\n<li>\n<p data-path-to-node=\"35,0,0\">\u512a\u308c\u305f\u52a0\u5de5\u6027\u3068\u6eb6\u63a5\u6027\u304c\u5fc5\u8981\u3060\u3002.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"35,1,0\">\u3053\u306e\u7528\u9014\u306b\u306f\u3001\u6392\u6c17\u30c0\u30af\u30c8\u306e\u3088\u3046\u306a\u30af\u30e9\u30c3\u30c9\uff08\u91cd\u306d\u5f35\u308a\uff09\u3084\u30b7\u30fc\u30c8\u30e1\u30bf\u30eb\u90e8\u54c1\u304c\u542b\u307e\u308c\u308b\u3002.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"35,2,0\">\u6975\u7aef\u306a\u964d\u4f0f\u5f37\u5ea6\u306f\u7b2c\u4e00\u306e\u8981\u4ef6\u3067\u306f\u306a\u3044\u3002.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"36\"><b>\u30a2\u30ed\u30a4725\u3092\u9078\u3076\u306a\u3089<\/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\/\">\u30d5\u30a1\u30b9\u30ca\u30fc<\/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\">\u6d77\u6d0b\u74b0\u5883\u3067\u306e\u5927\u304d\u306a\u5f15\u5f35\u5fdc\u529b\u306b\u8010\u3048\u308b\u7d20\u6750\u304c\u5fc5\u8981\u3060\u3002.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"37,2,0\">\u3053\u306e\u90e8\u54c1\u306f\u3001\u51b7\u9593\u52a0\u5de5\u304c\u4e0d\u53ef\u80fd\u306a\u5927\u65ad\u9762\u306e\u68d2\u6750\u3084\u935b\u9020\u54c1\u3067\u3042\u308b\u3002.<\/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>\u3088\u304f\u3042\u308b\u8cea\u554f (FAQ)<\/h3>\n<p data-path-to-node=\"42\"><b>Q1: \u30a2\u30ed\u30a4725\u306f\u30a2\u30ed\u30a4625\u306e\u3088\u3046\u306b\u7c21\u5358\u306b\u6eb6\u63a5\u3067\u304d\u307e\u3059\u304b\uff1f<\/b><\/p>\n<p data-path-to-node=\"42\">\u4e21\u8005\u3068\u3082\u6eb6\u63a5\u306f\u53ef\u80fd\u3067\u3042\u308b\u304c\u3001\u4e00\u822c\u306b\u5408\u91d1625 \u306e\u65b9\u304c\u6eb6\u63a5\u6027\u306b\u512a\u308c\u3001\u6eb6\u52a0\u6750\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u5408\u91d1725\u306f\u6eb6\u63a5\u304c\u53ef\u80fd\u3067\u3042\u308b\u304c\u3001\u6642\u52b9\u786c\u5316\u6027 \u5408\u91d1\u3067\u3042\u308b\u305f\u3081\u3001\u71b1\u5f71\u97ff\u90e8\u306e\u9ad8\u5f37\u5ea6\u7279\u6027\u3092\u56de\u5fa9\u3059\u308b\u305f \u3081\u306b\u306f\u3001\u4e00\u822c\u306b\u6eb6\u63a5\u5f8c\u306e\u71b1\u51e6\u7406\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002.<\/p>\n<p data-path-to-node=\"43\"><b>Q2: \u30a2\u30ed\u30a4725\u306f\u78c1\u6027\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/b><\/p>\n<p data-path-to-node=\"43\">\u5408\u91d1725\u306f\u3001\u5408\u91d1625\u3068\u540c\u69d8\u306b\u30cb\u30c3\u30b1\u30eb\u57fa\u8d85\u5408\u91d1 \u3067\u3042\u308a\u3001\u3042\u3089\u3086\u308b\u6761\u4ef6\u4e0b\u3067\u975e\u78c1\u6027\u3067\u3042\u308b\u3002\u3053\u306e\u305f\u3081\u3001\u4e21\u5408\u91d1\u306f\u3001\u7e4a\u7d30\u306a\u96fb\u5b50\u7b50\u4f53\u3084\u6d77\u5e95\u90e8\u54c1\u306a\u3069\u3001\u900f\u78c1\u7387\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u7528\u9014\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n<p data-path-to-node=\"44\"><b>Q3: \u306a\u305c\u5408\u91d1725\u306f625\u3088\u308a\u9ad8\u3044\u306e\u3067\u3059\u304b\uff1f<\/b><\/p>\n<p data-path-to-node=\"44\">\u30b3\u30b9\u30c8\u306e\u9055\u3044\u306f\u3001\u52a0\u5de5\u306e\u8907\u96d1\u3055\u306b\u8d77\u56e0\u3059\u308b\u3002\u539f\u6599\u30b3\u30b9\u30c8\u306f\u540c\u7a0b\u5ea6\u3067\u3042\u308b\u304c\u3001\u5408\u91d1725\u306f\u305d\u306e\u6a5f\u68b0\u7684\u7279\u6027\u3092\u5f97\u308b\u305f\u3081\u306b\u7cbe\u5bc6\u306a\u771f\u7a7a\u6eb6\u89e3\u3068\u9577\u6642\u9593\u306e\u71b1\u51e6\u7406\u30b5\u30a4\u30af\u30eb\uff08\u6eb6\u4f53\u5316\u51e6\u7406\u30682\u6bb5\u968e\u306e\u6642\u52b9\u51e6\u7406\uff09\u3092\u5fc5\u8981\u3068\u3059\u308b\u3002\u52a0\u3048\u3066\u3001Alloy 625\u306f\u306f\u308b\u304b\u306b\u5927\u91cf\u306b\u751f\u7523\u3055\u308c\u308b\u305f\u3081\u3001\u898f\u6a21\u306e\u7d4c\u6e08\u6027\u304c\u3042\u308a\u307e\u3059\u3002.<\/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 N07725) is essentially Alloy 625 with a specific modification. Metallurgists took the proven corrosion-resistant base of 625 and added small, precise amounts of Titanium (Ti) and Aluminum (Al). Alloy 625: Strengthened primarily by the stiffening effect of molybdenum and niobium in the nickel-chromium matrix (Solid Solution Strengthening). Alloy 725: Strengthened by the precipitation of microscopic [&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? 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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. 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