2219 aluminum<\/a> is the 2xxx-series alloy built for temperature extremes \u2014 it holds strength at cryogenic temperatures and retains useful mechanical properties at elevated temperatures up to 315\u00b0C, a range where most aluminium<\/a> alloys soften significantly. Originally developed for aerospace fuel tanks and high-temperature structures, 2219 also stands out as one of the few 2xxx alloys that welds reliably. This guide maps where the alloy works, where the limits are, and how to compare it against 2024, 7075, and 6061.<\/p>\n 2219 is an Al-Cu-Mn system with small additions of titanium, vanadium, and zirconium for grain refinement and high-temperature stability:<\/p>\n In the T62 temper, 2219 reaches tensile strengths around 414\u2013455 MPa with yield strength in the 290\u2013345 MPa range. The defining advantage over 2024 and 7075 is retained strength at elevated temperature \u2014 2219 maintains useful mechanical properties above 250\u00b0C, where both 2024 and 7075 drop steeply. At cryogenic temperatures, tensile and yield strength increase without a corresponding loss in toughness.<\/p>\n 2219 delivers high fracture toughness in the T62 and T87 tempers \u2014 a critical property for aerospace pressure vessels and cryogenic tank structures. The alloy resists crack propagation better than most 7000-series alloys at equivalent strength levels.<\/p>\n 2219 is one of the few 2xxx-series alloys rated as weldable. GTAW (TIG) and GMAW (MIG) are the standard processes. Filler metal 2319 is recommended to match the base metal composition. Post-weld re-heat-treatment is typically required to restore full strength in the weld zone.<\/p>\n Like most 2xxx alloys, bare 2219 has limited corrosion resistance due to the high copper content. Cladding or protective coating is standard for outdoor or corrosive service. Exfoliation corrosion resistance improves in the T87 and T851 tempers through controlled grain structure.<\/p>\n 2024 delivers higher room-temperature strength (~470 MPa UTS in T4) and is the default aerospace sheet alloy. 2219 sacrifices some room-temperature strength for elevated-temperature performance and weldability \u2014 the deciding factor is whether the part operates above 150\u00b0C or requires fusion welding.<\/p>\n 7075-T6 has higher room-temperature strength (~570 MPa UTS) but is not recommended for fusion welding. 2219 wins when weldability, high-temperature strength retention, or cryogenic toughness are the critical factors. 7075 wins when peak room-temperature strength-to-weight ratio is the only requirement.<\/p>\n 6061 is weldable, corrosion-resistant, and widely available at lower cost, but its elevated-temperature performance is limited and strength is significantly lower (~310 MPa UTS in T6). 2219 is the choice when the service temperature range pushes past 6061’s practical limit.<\/p>\n Use this quick reference to decide whether 2219 fits your application.<\/p>\n Go \u2014 use 2219 when:<\/strong><\/p>\n No-Go \u2014 do not use 2219 when:<\/strong><\/p>\n The Go\/No-Go criteria above cover selection logic. The list below maps specific systems where 2219 is standard practice:<\/p>\n 2219 aluminum is the 2xxx alloy built for temperature extremes \u2014 it holds strength where 2024 and 7075 soften, and it welds where most other high-strength grades crack. The trade-offs are higher cost, narrower stock availability, and a mandatory need for cladding or coating in corrosive service.<\/p>\n Linsy Aluminum stocks 2219 plate, bar, and custom-extruded profiles, with low-MOQ custom production available for non-stock dimensions. Full MTC documentation comes with every order, and SGS testing for chemical composition, mechanical properties, and ultrasonic inspection is available on request. Send the drawing for a grade-fit and lead-time review.<\/p>\n 2219 shows increased tensile and yield strength at cryogenic temperatures without a corresponding loss in toughness \u2014 one of the reasons it was selected for the Space Shuttle external tank. Both strength and fracture toughness improve as temperature drops, making it a strong candidate for LNG, liquid oxygen, and liquid hydrogen storage systems.<\/p>\n Yes \u2014 2219 is weldable via GTAW (TIG) and GMAW (MIG). Filler metal 2319 is recommended to match the base metal chemistry. Post-weld re-heat-treatment is typically required to restore mechanical properties in the weld zone. Qualification testing with production-intent parameters is recommended.<\/p>\n Elevated-temperature strength retention and weldability. 2024 has higher room-temperature strength but softens significantly above 150\u00b0C and is not recommended for fusion welding. 2219 is the answer when the part will see heat or needs to be welded.<\/p>\n 2219 is primarily produced as plate, bar, forging stock, and extrusion. Sheet may be available depending on temper and thickness \u2014 for sheet-specific requirements, confirm availability with the supplier, including any minimum order quantity and lead time.<\/p>\n The T62, T87, and T851 tempers are supplied in the aged condition and generally do not require post-machining heat treatment. However, if welding is involved, re-heat-treatment of the weld zone is standard practice to restore strength. Confirm the required temper and post-process treatment with the mill before ordering.<\/p>","protected":false},"excerpt":{"rendered":" Introduction 2219 aluminum is the 2xxx-series alloy built for temperature extremes \u2014 it holds strength at cryogenic temperatures and retains useful mechanical properties at elevated temperatures up to 315\u00b0C, a range where most aluminum alloys soften significantly. Originally developed for aerospace fuel tanks and high-temperature structures, 2219 also stands out as one of the few […]<\/p>\n","protected":false},"author":1,"featured_media":8364,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"2219 Aluminum Alloy: Properties, Welding, and Temperature Performance Guide","_seopress_titles_desc":"In-depth guide to 2219 aluminum alloy covering elevated-temperature strength, cryogenic performance, TIG\/MIG welding parameters, and comparisons with 2024, 7075, and 6061. Includes Go\/No-Go limits for aerospace and industrial applications.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[174],"tags":[],"class_list":["post-8372","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-2000-series-aluminum"],"_links":{"self":[{"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/posts\/8372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/comments?post=8372"}],"version-history":[{"count":2,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/posts\/8372\/revisions"}],"predecessor-version":[{"id":10235,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/posts\/8372\/revisions\/10235"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/media\/8364"}],"wp:attachment":[{"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/media?parent=8372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/categories?post=8372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/premiumalu.com\/fr\/wp-json\/wp\/v2\/tags?post=8372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Composition chimique<\/h2>\n
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Propri\u00e9t\u00e9s principales<\/h2>\n
Strength and Elevated-Temperature Performance<\/h3>\n
R\u00e9sistance \u00e0 la rupture<\/h3>\n
Soudabilit\u00e9<\/h3>\n
R\u00e9sistance \u00e0 la corrosion<\/h3>\n
2219 vs. Other Alloys<\/h2>\n
2219 vs. 2024<\/h3>\n
2219 vs. 7075<\/h3>\n
2219 vs. 6061<\/h3>\n
Temp\u00e9raments courants<\/h2>\n
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Go\/No-Go Limits<\/h2>\n
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Applications<\/h2>\n
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Conclusion<\/h2>\n
Questions fr\u00e9quemment pos\u00e9es<\/h2>\n
How does 2219 perform at cryogenic temperatures?<\/h3>\n
Can 2219 be welded, and what filler is recommended?<\/h3>\n
What is the main advantage of 2219 over 2024?<\/h3>\n
Is 2219 available in sheet form?<\/h3>\n
Does 2219 require special heat treatment after machining?<\/h3>\n