{"id":18084,"date":"2026-04-24T10:40:08","date_gmt":"2026-04-24T05:10:08","guid":{"rendered":"https:\/\/aluminiummagazine.com\/mag\/?p=18084"},"modified":"2026-04-25T11:22:55","modified_gmt":"2026-04-25T05:52:55","slug":"aluminium-7020-alloy-properties-weldability-military","status":"publish","type":"post","link":"https:\/\/aluminiummagazine.com\/mag\/aluminium\/aluminium-7020-alloy-properties-weldability-military.html","title":{"rendered":"Aluminium 7020 Alloy: Properties, Weldability, and Military-Grade Applications"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Aluminium 7020 is a high-strength, heat-treatable alloy belonging to the <strong>Al-Zn-Mg (7000) series<\/strong>. Unlike many other 7000-series alloys that contain copper, 7020 is <strong>copper-free<\/strong>, which gives it exceptional <strong>weldability<\/strong> and <strong>stress corrosion cracking resistance<\/strong>. This makes it a preferred material for structural applications in military, transportation, and general engineering where welding is required.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Chemical Composition of Aluminium 7020<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below shows the typical composition limits for Aluminum 7020 (according to EN 573-3 standard).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"><strong>Element<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Weight %<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Aluminium (Al)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Balance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Zinc (Zn)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">4.0 \u2013 5.0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Magnesium (Mg)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">1.0 \u2013 1.4<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Manganese (Mn)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">0.05 \u2013 0.50<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Chromium (Cr)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">0.10 \u2013 0.20<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Zirconium (Zr)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">0.08 \u2013 0.20<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Titanium (Ti)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">0.01 \u2013 0.10<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Silicon (Si)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u2264 0.35<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Iron (Fe)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u2264 0.40<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Copper (Cu)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u2264 0.10<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Others (each)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u2264 0.05<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">The absence of copper is the key differentiator from alloys like <strong>Aluminium 7075<\/strong> \u2013 it dramatically improves weldability and corrosion resistance in welded conditions.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Mechanical &amp; Physical Properties<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 7020 is typically supplied in the <strong>T6<\/strong> or <strong>T651<\/strong> temper (solution heat-treated and artificially aged). Its properties strike an excellent balance between strength and ductility.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"><strong>Property<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Value (T6 Temper)<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Tensile Strength (Ultimate)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">350 \u2013 410 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Yield Strength (0.2% offset)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">280 \u2013 350 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Elongation at Break<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">8 \u2013 12%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Hardness (Brinell)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">~100 HB<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Fatigue Strength<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">140 \u2013 160 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Elastic Modulus<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">70 GPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Density<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">2.78 g\/cm\u00b3<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Thermal Conductivity<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">130 \u2013 150 W\/m\u00b7K<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Electrical Resistivity<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">0.045 \u2013 0.055 \u03bc\u03a9\u00b7m<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Heat Treatment and Weldability<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Heat Treatment<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solution Heat Treatment:<\/strong> 450 \u2013 480\u00b0C<\/li>\n\n\n\n<li><strong>Quenching:<\/strong> Water or forced air<\/li>\n\n\n\n<li><strong>Artificial Aging:<\/strong> 120 \u2013 140\u00b0C for 12 \u2013 24 hours (T6 temper)<\/li>\n\n\n\n<li><strong>Natural Aging:<\/strong> 7020 can also naturally age to a stable condition over several weeks.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Weldability \u2013 The Standout Feature<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 7020 has <strong>excellent weldability<\/strong> using MIG, TIG, and resistance welding. Because it contains <strong>no copper<\/strong>, the heat-affected zone (HAZ) does not suffer from severe strength loss or cracking.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Filler wire:<\/strong> ER5356 or ER5183 are recommended.<\/li>\n\n\n\n<li><strong>Preheating:<\/strong> Not required for sections under 12 mm; for thicker plates, preheat to 100\u2013150\u00b0C.<\/li>\n\n\n\n<li><strong>Post-weld aging:<\/strong> A low-temperature aging treatment (100\u2013120\u00b0C for 8\u201316 hours) can restore up to 90% of the original strength.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For a comparison of weldability across different 7000-series alloys, see our guide on <strong>Aluminium 7005<\/strong>, which also offers excellent welding characteristics for structural applications.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Applications of Aluminum 7020<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thanks to its high strength, weldability, and corrosion resistance, 7020 is used in demanding structural applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Military and Defence<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Military bridges<\/strong> (e.g., portable assault bridges)<\/li>\n\n\n\n<li><strong>Armoured vehicle components<\/strong> (non-ballistic structural parts)<\/li>\n\n\n\n<li><strong>Helicopter landing platforms<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Railway and Transport<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Railcar bodies<\/strong> and underframes<\/li>\n\n\n\n<li><strong>Truck and trailer chassis<\/strong> components<\/li>\n\n\n\n<li><strong>Bus superstructures<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Bicycle Frames<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 7020 is a popular choice for <strong>mountain bike and touring bike frames<\/strong>. It offers a slightly higher strength-to-weight ratio than 7005 and is often welded without post-weld heat treatment.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Learn more about aluminium\u2019s role in modern <strong>bicycle frames<\/strong> and why it dominates the cycling industry.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">4. General Structural Engineering<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Crane components<\/strong><\/li>\n\n\n\n<li><strong>Scaffolding and access towers<\/strong><\/li>\n\n\n\n<li><strong>Offshore platforms<\/strong> (where weldability and corrosion resistance are critical)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. Marine Applications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">7020 shows good resistance to seawater corrosion, especially in welded conditions, making it suitable for <strong>boat hull reinforcements<\/strong> and <strong>superstructures<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Comparison with Other Aluminium Alloys<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"><strong>Alloy<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Strength<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Weldability<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Corrosion Resistance<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Typical Applications<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>7020<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">High (350\u2013410 MPa)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Excellent<\/td><td class=\"has-text-align-left\" data-align=\"left\">Good (SCC resistant)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Military bridges, railcars, bikes<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>7005<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">Medium-High (350\u2013450 MPa)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Excellent<\/td><td class=\"has-text-align-left\" data-align=\"left\">Very Good<\/td><td class=\"has-text-align-left\" data-align=\"left\">Bicycle frames, scaffolding<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>7050<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">Very High (490\u2013550 MPa)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Poor (not recommended)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Excellent (thick sections)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Aerospace wing skins, fuselage<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>7075<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">Highest (570 MPa+)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Very Poor<\/td><td class=\"has-text-align-left\" data-align=\"left\">Moderate<\/td><td class=\"has-text-align-left\" data-align=\"left\">Aircraft fittings, rock climbing gear<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>6061<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">Medium (310 MPa)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Excellent<\/td><td class=\"has-text-align-left\" data-align=\"left\">Good<\/td><td class=\"has-text-align-left\" data-align=\"left\">General purpose, marine, pipes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Key takeaway:<\/strong> Choose <strong>7020<\/strong> when you need high strength <strong>and<\/strong> reliable weldability for structural components. Choose <strong>7075<\/strong> only for machined parts that will not be welded. Choose <strong>6061<\/strong> for lower-cost, general-purpose applications.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">For a deep dive into another highly weldable alloy, read our complete guide on <strong><a href=\"https:\/\/aluminiummagazine.com\/mag\/aluminium\/aluminum-7005-alloy-properties-weldability-guide.html\" data-type=\"post\" data-id=\"18071\">Aluminium 7005 \u2013 properties, applications, and weldability<\/a><\/strong>.<\/p><div class=\"pai-ad\" style=\"min-height:250px;visibility:hidden;\"><span style=\"display: block; text-align: center; font-size: 10px; margin: 0 0 10px 0; color: #999999;\">Ads<\/span>\r\n<!-- Display-300x250-1 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:300px;height:250px\"\r\n     data-ad-client=\"ca-pub-3838168351244230\"\r\n     data-ad-slot=\"9933646018\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Machining and Forming<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Machinability:<\/strong> Fair to good. Use sharp carbide tools, moderate speeds, and plenty of coolant to avoid built-up edge. Stress-relieving after rough machining is recommended for tight tolerances.<\/li>\n\n\n\n<li><strong>Forming:<\/strong> 7020 has lower formability than 6061. Cold bending of thin sections is possible; thicker sections require hot forming (250\u2013350\u00b0C).<\/li>\n\n\n\n<li><strong>Corrosion protection:<\/strong> Anodizing or powder coating is recommended for outdoor exposure, especially in coastal or industrial environments.<br>See our article on <strong>powder coating vs. anodizing<\/strong> to choose the right finish for your 7020 components.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Standards and Equivalents<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"><strong>Standard<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Designation<\/strong><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>EN 573-3<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">EN AW\u20117020<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>UNS<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">A97020<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>DIN<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">3.4345<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Former USSR<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">D16 (similar, not identical)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div style=\"height:75px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Advantages and Limitations<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High strength-to-weight ratio<\/li>\n\n\n\n<li>Excellent weldability (no copper)<\/li>\n\n\n\n<li>Good stress corrosion cracking resistance<\/li>\n\n\n\n<li>Naturally aging possible<\/li>\n\n\n\n<li>Suitable for welded military and transport structures<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u274c Limitations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lower strength than 7050 or 7075<\/li>\n\n\n\n<li>Not suitable for high-temperature service (>150\u00b0C)<\/li>\n\n\n\n<li>Requires protective coating for long-term marine exposure<\/li>\n\n\n\n<li>More expensive than 6xxx series alloys<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Aluminum 7020<\/strong> is a specialist alloy that shines where others fail \u2013 in <strong>welded, high-strength structural applications<\/strong>. Its copper-free composition gives it a unique place in the 7000 series, making it the go-to material for military bridges, railway carriages, bicycle frames, and heavy-duty transport equipment. While it does not reach the extreme strength of 7075, its combination of weldability, corrosion resistance, and strength is unmatched among heat-treatable aluminium alloys.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For engineers and fabricators looking for a reliable, weldable, high-strength aluminium, 7020 is an outstanding choice.<\/p><script>document.addEventListener(\"DOMContentLoaded\",function(){\n        if(window.innerWidth <= 768){\n            if (\"immediate\" === \"delay\") {\n                setTimeout(function(){document.querySelectorAll(\".pai-ad\").forEach(el=>el.style.visibility=\"visible\")},0);\n            } else if (\"immediate\" === \"scroll\") {\n                window.addEventListener(\"scroll\",function(){\n                    let s=window.scrollY\/(document.body.scrollHeight-window.innerHeight);\n                    if(s>0.1){\n                        document.querySelectorAll(\".pai-ad\").forEach(el=>el.style.visibility=\"visible\");\n                    }\n                });\n            } else {\n                document.querySelectorAll(\".pai-ad\").forEach(el=>el.style.visibility=\"visible\");\n            }\n        } else {\n            document.querySelectorAll(\".pai-ad\").forEach(el=>el.remove());\n        }\n    });<\/script>","protected":false},"excerpt":{"rendered":"<p>Aluminium 7020 is a high-strength, heat-treatable alloy belonging to the Al-Zn-Mg (7000) series. Unlike many other 7000-series alloys that contain copper, 7020 is copper-free, which gives it exceptional weldability and stress corrosion cracking resistance. This makes it a preferred material for structural applications in military, transportation, and general engineering where welding is required. Chemical Composition &#8230; <a title=\"Aluminium 7020 Alloy: Properties, Weldability, and Military-Grade Applications\" class=\"read-more\" href=\"https:\/\/aluminiummagazine.com\/mag\/aluminium\/aluminium-7020-alloy-properties-weldability-military.html\" aria-label=\"Read more about Aluminium 7020 Alloy: Properties, Weldability, and Military-Grade Applications\">Read more<\/a><\/p>\n","protected":false},"author":12,"featured_media":18089,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[721],"tags":[4111,4109],"class_list":["post-18084","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aluminium","tag-aluminium-alloys","tag-aluminum"],"_links":{"self":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/18084","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/comments?post=18084"}],"version-history":[{"count":0,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/18084\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/media\/18089"}],"wp:attachment":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/media?parent=18084"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/categories?post=18084"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/tags?post=18084"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}