{"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\/pt\/what-is-the-difference-between-625-and-725-alloy\/","title":{"rendered":"Qual \u00e9 a diferen\u00e7a entre a liga 625 e a liga 725?"},"content":{"rendered":"<p data-path-to-node=\"17\">Embora partilhem um c\u00f3digo gen\u00e9tico quase id\u00eantico no que respeita \u00e0 resist\u00eancia \u00e0 corros\u00e3o, a distin\u00e7\u00e3o reside inteiramente na forma como lidam com o stress mec\u00e2nico.<\/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>Composi\u00e7\u00e3o qu\u00edmica<\/h2>\n<p data-path-to-node=\"19\">Para compreender a diferen\u00e7a, temos de olhar primeiro para a qu\u00edmica. A liga 625 \u00e9 uma liga de n\u00edquel-cr\u00f3mio-molibd\u00e9nio que cont\u00e9m ni\u00f3bio. Esta combina\u00e7\u00e3o proporciona uma excelente resist\u00eancia \u00e0 corros\u00e3o por picadas e em fendas.<\/p>\n<p data-path-to-node=\"20\"><b>Liga 725 (UNS N07725)<\/b> \u00e9 essencialmente a liga 625 com uma modifica\u00e7\u00e3o espec\u00edfica. Os metal\u00fargicos utilizaram a base comprovadamente resistente \u00e0 corros\u00e3o da 625 e adicionaram pequenas quantidades precisas de <b>Tit\u00e2nio (Ti) e Alum\u00ednio (Al)<\/b>.<\/p>\n<ul data-path-to-node=\"21\">\n<li>\n<p data-path-to-node=\"21,0,0\"><b>Liga 625:<\/b> Refor\u00e7ado principalmente pelo efeito de endurecimento do molibd\u00e9nio e do ni\u00f3bio na matriz de n\u00edquel-cr\u00f3mio (Refor\u00e7o de solu\u00e7\u00e3o s\u00f3lida).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,1,0\"><b>Liga 725:<\/b> Refor\u00e7ado pela precipita\u00e7\u00e3o de fases microsc\u00f3picas gama-prime e gama-double-prime durante o tratamento t\u00e9rmico (endurecimento por precipita\u00e7\u00e3o).<\/p>\n<\/li>\n<\/ul>\n<h2>A diferen\u00e7a do n\u00facleo: For\u00e7a de rendimento<\/h2>\n<p data-path-to-node=\"23\">Se a resist\u00eancia \u00e0 corros\u00e3o \u00e9 o escudo, o limite de elasticidade \u00e9 o m\u00fasculo. \u00c9 aqui que o <b>diferen\u00e7a entre a liga 625 e a liga 725<\/b> torna-se ineg\u00e1vel.<\/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\">A liga 725 muda o jogo. Devido \u00e0 adi\u00e7\u00e3o de tit\u00e2nio e alum\u00ednio, pode ser tratada termicamente (envelhecida) para obter uma resist\u00eancia ultraelevada sem necessidade de trabalho a frio. <b>A liga 725 atinge rotineiramente limites de elasticidade superiores a 120 ksi (827 MPa) - praticamente o dobro da liga 625 recozida.<\/b><\/p>\n<p data-path-to-node=\"26\">Isto faz com que a liga 725 seja a melhor escolha para sec\u00e7\u00f5es grandes e complexas que requerem uma elevada resist\u00eancia, mas que s\u00e3o demasiado espessas para serem eficazmente trabalhadas a frio.<\/p>\n<h2>Resist\u00eancia \u00e0 corros\u00e3o<\/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\">Porque a qu\u00edmica de base (alto teor de n\u00edquel e molibd\u00e9nio) permanece consistente, <b>A liga 725 mant\u00e9m essencialmente a mesma resist\u00eancia \u00e0 corros\u00e3o que a liga 625.<\/b> Ambas as ligas oferecem uma resist\u00eancia excecional \u00e0<\/p>\n<ul data-path-to-node=\"30\">\n<li>\n<p data-path-to-node=\"30,0,0\">\u00c1gua do mar e ambientes marinhos.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"30,1,0\">Corros\u00e3o por picadas e corros\u00e3o em fendas.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"30,2,0\">Fissura\u00e7\u00e3o por tens\u00e3o de sulfureto (SSC).<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"31\">Esta combina\u00e7\u00e3o \u00fanica coloca a liga 725 numa categoria distinta: oferece a resist\u00eancia \u00e0 corros\u00e3o da liga 625 com a for\u00e7a da liga 718.<\/p>\n<h2>Cen\u00e1rios de aplica\u00e7\u00e3o: Quando usar qual?<\/h2>\n<p data-path-to-node=\"33\">A escolha entre eles resume-se geralmente \u00e0 carga mec\u00e2nica da aplica\u00e7\u00e3o.<\/p>\n<p data-path-to-node=\"34\"><b>Escolha Alloy 625 quando:<\/b><\/p>\n<ul data-path-to-node=\"35\">\n<li>\n<p data-path-to-node=\"35,0,0\">\u00c9 necess\u00e1ria uma excelente capacidade de fabrico e de soldadura.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"35,1,0\">A aplica\u00e7\u00e3o envolve o revestimento (sobreposi\u00e7\u00e3o) ou componentes de chapa met\u00e1lica, como condutas de escape.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"35,2,0\">O limite de elasticidade extremo n\u00e3o \u00e9 o requisito principal.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"36\"><b>Escolha a liga 725 quando:<\/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\/\">fixadores<\/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\">\u00c9 necess\u00e1rio que o material resista a uma enorme tens\u00e3o de tra\u00e7\u00e3o em ambientes mar\u00edtimos.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"37,2,0\">O componente \u00e9 uma barra de grande sec\u00e7\u00e3o ou um forjamento em que \u00e9 imposs\u00edvel trabalhar a frio.<\/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>Perguntas frequentes (FAQs)<\/h3>\n<p data-path-to-node=\"42\"><b>Q1: A liga 725 pode ser soldada t\u00e3o facilmente como a liga 625?<\/b><\/p>\n<p data-path-to-node=\"42\">Embora ambas possam ser soldadas, a liga 625 \u00e9 geralmente considerada como tendo uma soldabilidade superior e \u00e9 frequentemente utilizada como metal de adi\u00e7\u00e3o. A liga 725 pode ser soldada, mas como \u00e9 uma liga endurec\u00edvel por envelhecimento, normalmente requer tratamento t\u00e9rmico p\u00f3s-soldagem para restaurar as suas propriedades de alta resist\u00eancia na zona afetada pelo calor.<\/p>\n<p data-path-to-node=\"43\"><b>Q2: A liga 725 \u00e9 magn\u00e9tica?<\/b><\/p>\n<p data-path-to-node=\"43\">N\u00e3o. Tal como a liga 625, a liga 725 \u00e9 uma superliga \u00e0 base de n\u00edquel e n\u00e3o \u00e9 magn\u00e9tica em todas as condi\u00e7\u00f5es. Isto torna ambas as ligas adequadas para aplica\u00e7\u00f5es em que a permeabilidade magn\u00e9tica deve ser minimizada, como em caixas electr\u00f3nicas sens\u00edveis ou componentes submarinos.<\/p>\n<p data-path-to-node=\"44\"><b>Q3: Porque \u00e9 que a liga 725 \u00e9 mais cara do que a 625?<\/b><\/p>\n<p data-path-to-node=\"44\">A diferen\u00e7a de custos resulta da complexidade do processamento. Embora os custos das mat\u00e9rias-primas sejam compar\u00e1veis, a liga 725 requer uma fus\u00e3o a v\u00e1cuo precisa e ciclos de tratamento t\u00e9rmico alargados (recozimento em solu\u00e7\u00e3o e envelhecimento em duas fases) para atingir as suas propriedades mec\u00e2nicas. Al\u00e9m disso, a liga 625 \u00e9 produzida em volumes muito maiores, oferecendo economias de escala.<\/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\/pt\/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\/pt\/wp-json\/wp\/v2\/posts\/1753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/comments?post=1753"}],"version-history":[{"count":2,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts\/1753\/revisions"}],"predecessor-version":[{"id":2555,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/posts\/1753\/revisions\/2555"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/media\/1754"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/media?parent=1753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/categories?post=1753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/pt\/wp-json\/wp\/v2\/tags?post=1753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}