{"id":19688,"date":"2026-11-13T16:56:28","date_gmt":"2026-11-13T11:26:28","guid":{"rendered":"https:\/\/aluminiummagazine.com\/mag\/?p=19688"},"modified":"2026-11-13T16:56:29","modified_gmt":"2026-11-13T11:26:29","slug":"aluminium-6351-t6-structural-alloy","status":"publish","type":"post","link":"https:\/\/aluminiummagazine.com\/mag\/aluminium\/aluminium-6351-t6-structural-alloy.html","title":{"rendered":"Aluminium 6351 T6: The High\u2011Strength Structural Alloy for Marine and Transport Applications"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Aluminium 6351 T6<\/strong> \u2013 also known as Aluminum 6351 T6 \u2013 is a heat\u2011treatable aluminium\u2011magnesium\u2011silicon alloy belonging to the 6000 series. While the broader 6xxx family is valued for balanced properties, <strong>6351 T6<\/strong> is specifically recognised for delivering <strong>higher strength than 6061<\/strong> while retaining excellent weldability, good corrosion resistance and moderate extrudability. In the T6 temper \u2013 solution heat treated and artificially aged \u2013 it achieves minimum tensile strength of 295 MPa and yield strength of 255 MPa, making it a practical structural alloy for marine, defence, transport and general engineering applications where 6061 lacks sufficient strength and 7xxx alloys would introduce unnecessary cost or corrosion complexity.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What is Aluminium 6351 T6?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium alloy 6351 is a member of the 6000 series (aluminium\u2011magnesium\u2011silicon) and is chemically positioned between 6061 and 6082 in terms of strength. Its magnesium and silicon contents (each approximately 0.4\u20130.8%) form magnesium\u2011silicide (Mg\u2082Si) precipitates during artificial ageing, which is the primary strengthening mechanism. The manganese addition (0.4\u20130.8%) contributes to grain structure control and toughness, while the low copper content keeps the alloy readily weldable and corrosion\u2011resistant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>T6 temper<\/strong> is the most widely specified condition for structural use. It involves solution heat treatment followed by artificial ageing to achieve a stable, high\u2011strength condition with moderate ductility. Aluminium 6351 T6 is commonly supplied as <strong>extruded bar, rod, tube and profile<\/strong>, and is widely known under designations such as <strong>EN AW\u2011AlSi1Mg0.5Mn, ISO AlSi1Mg0.5Mn, UNS A96351 and AFNOR A\u2011SGM0.7<\/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<div class=\"afb-block features-list-block\"><h3 class=\"afb-title\"><svg class=\"afb-icon\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"3\"><\/circle><path d=\"M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z\"><\/path><\/svg> Key Characteristics at a Glance<\/h3><ul><li>\u2713 <strong>Density:<\/strong> 2.71 g\/cm\u00b3<\/li><li>\u2713 <strong>Melting point:<\/strong> 554\u00b0C<\/li><li>\u2713 <strong>Thermal conductivity:<\/strong> 176 W\/m\u00b7K (T6)<\/li><li>\u2713 <strong>Modulus of elasticity:<\/strong> 68.9\u201369 GPa<\/li><li>\u2713 <strong>Minimum tensile strength (T6, &lt;150 mm):<\/strong> 295 MPa<\/li><li>\u2713 <strong>Typical tensile strength (T6):<\/strong> 310 MPa (MatWeb, AA typical)<\/li><li>\u2713 <strong>Minimum yield strength (T6, &lt;150 mm):<\/strong> 255 MPa<\/li><li>\u2713 <strong>Typical yield strength (T6):<\/strong> 283 MPa (MatWeb, AA typical)<\/li><li>\u2713 <strong>Elongation (T6):<\/strong> 8% minimum (product standard) to 14% (AA typical)<\/li><li>\u2713 <strong>Hardness:<\/strong> 95 HB<\/li><li>\u2713 <strong>Electrical conductivity:<\/strong> 46% IACS<\/li><\/ul><\/div>\n\n\n<p class=\"wp-block-paragraph\"><em>Data compiled from BlueScope Distribution, MatWeb and Referans Metal.<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Chemical Composition<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 6351 is a magnesium\u2011 and silicon\u2011rich alloy with manganese as a secondary addition. The balanced Mg\/Si ratio promotes efficient Mg\u2082Si precipitation, while the manganese refines grain structure and supports toughness. Unlike 6061, 6351 contains no intentional chromium addition, and its copper limit is tighter, contributing to its good weldability and corrosion behaviour.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Element<\/th><th>Percentage (%)<\/th><\/tr><\/thead><tbody><tr><td>Aluminium (Al)<\/td><td>96 \u2013 98.5<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>0.70 \u2013 1.30<\/td><\/tr><tr><td>Magnesium (Mg)<\/td><td>0.40 \u2013 0.80<\/td><\/tr><tr><td>Manganese (Mn)<\/td><td>0.40 \u2013 0.80<\/td><\/tr><tr><td>Iron (Fe)<\/td><td>\u2264 0.50<\/td><\/tr><tr><td>Copper (Cu)<\/td><td>\u2264 0.10<\/td><\/tr><tr><td>Zinc (Zn)<\/td><td>\u2264 0.20<\/td><\/tr><tr><td>Titanium (Ti)<\/td><td>\u2264 0.20<\/td><\/tr><tr><td>Others (Each)<\/td><td>\u2264 0.05<\/td><\/tr><tr><td>Others (Total)<\/td><td>\u2264 0.15<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Source: BlueScope Distribution \/ Referans Metal (EN AW\u2011AlSi1Mg0.5Mn)<\/em><\/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<p class=\"wp-block-paragraph\">The low copper and iron limits help maintain corrosion resistance and weld integrity, while the silicon and magnesium levels are optimised for the T6 strengthening response.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Key Properties of Aluminium 6351 T6<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udcaa High Strength \u2013 Higher than 6061, Close to 6082<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 6351 T6 delivers <strong>higher strength than 6061 T6<\/strong> and sits just below 6082 T6 in the 6xxx hierarchy. This makes it a useful middle\u2011ground structural alloy: stronger than general\u2011purpose 6061, yet more readily extrudable and weldable than some higher\u2011strength alternatives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical Mechanical Properties (T6 Temper):<\/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<figure class=\"wp-block-table\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Property<\/th><th class=\"has-text-align-center\" data-align=\"center\">Value<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Ultimate tensile strength (product standard, &lt;150 mm)<\/td><td class=\"has-text-align-center\" data-align=\"center\">295 MPa minimum<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Ultimate tensile strength (AA typical)<\/td><td class=\"has-text-align-center\" data-align=\"center\">310 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Yield strength (product standard, &lt;150 mm)<\/td><td class=\"has-text-align-center\" data-align=\"center\">255 MPa minimum<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Yield strength (AA typical)<\/td><td class=\"has-text-align-center\" data-align=\"center\">283 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Elongation<\/td><td class=\"has-text-align-center\" data-align=\"center\">8% min (standard) \/ 14% (AA typical)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Shear strength<\/td><td class=\"has-text-align-center\" data-align=\"center\">200 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Fatigue strength<\/td><td class=\"has-text-align-center\" data-align=\"center\">89.6\u201390 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hardness<\/td><td class=\"has-text-align-center\" data-align=\"center\">95 HB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Sources: BlueScope Distribution \/ MatWeb \/ Referans Metal<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In research settings, optimised T6 treatments have achieved UTS up to 320 MPa and YS up to 270 MPa, with elongation around 12%, confirming the alloy\u2019s response to controlled artificial ageing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udee1\ufe0f Excellent Corrosion Resistance \u2013 Marine\u2011Grade Capability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 6351 T6 exhibits <strong>excellent corrosion resistance<\/strong> in normal atmospheres and marine environments, owing to the thin, self\u2011healing aluminium oxide film that forms on its surface. The 6xxx series is widely regarded as a marine\u2011grade family, and 6351 T6 is specifically used in <strong>scuba tanks, boat fittings and offshore structural components<\/strong>. Its corrosion performance is superior to that of copper\u2011rich 2xxx and zinc\u2011rich 7xxx alloys in many service environments, making it a practical choice where both strength and long\u2011term durability are required.<\/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<h3 class=\"wp-block-heading\">\ud83d\udd27 Excellent Weldability \u2013 A Defining Advantage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">One of the strongest practical arguments for 6351 T6 is its <strong>excellent weldability by all standard methods<\/strong>, including GMAW (MIG) and GTAW (TIG). Recommended filler alloys are <strong>4043<\/strong> as the primary choice and <strong>5356<\/strong> as a suitable alternative. The alloy can also be brazed. Because it is heat\u2011treatable, some strength reduction occurs in the heat\u2011affected zone after welding, but the welded joint retains good mechanical integrity and corrosion resistance, enabling reliable fabrication of large structural assemblies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2699\ufe0f Good Machinability and Formability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Machinability of 6351 is rated as <strong>good in the T5 and T6 tempers<\/strong>, and the alloy also offers <strong>very good formability<\/strong> in appropriate conditions. It can be extruded, forged and rolled, although its extrudability is moderate rather than exceptional \u2013 suitable for structural profiles but not for the most complex thin\u2011wall shapes. For forming operations, softer tempers such as O or T4 are preferred, while T6 is typically specified for finished machined or welded components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd25 Heat Treatment \u2013 The T6 Temper<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The T6 designation indicates that the alloy has been <strong>solution heat treated and then artificially aged<\/strong> to achieve a stable, high\u2011strength condition. This is the most common temper for structural extrusions, bar and tube. The T6 treatment produces a fine, well\u2011dispersed precipitate distribution that maximises strength, albeit with lower elongation than softer tempers. Other available tempers include <strong>O (annealed), T4 (solution treated and naturally aged), T5 (cooled from hot working and artificially aged) and T651 (stress\u2011relieved by stretching)<\/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<h2 class=\"wp-block-heading\">Applications of Aluminium 6351 T6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 6351 T6 is a <strong>structural workhorse<\/strong> whose combination of higher\u2011than\u20116061 strength, excellent weldability and marine\u2011grade corrosion resistance makes it suitable for demanding fabricated structures across multiple industries.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2693 Marine and Offshore \u2013 A Core Application<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">6351 T6 is widely used in <strong>marine structures, boat hulls and fittings, scuba tanks and offshore components<\/strong> where resistance to seawater corrosion and weldability are essential. Its ability to be welded into large assemblies without severe loss of performance makes it practical for shipyards and boatbuilders.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\ude9b Transport and Structural Engineering<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The alloy is used in <strong>truck bodies, recreational trailers, automotive componentry, rail structures and bridge and civil structural supports<\/strong>. Its higher strength than 6061 allows weight savings or increased load capacity in these applications without moving to a less weldable or more corrosion\u2011sensitive alloy family.<\/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<h3 class=\"wp-block-heading\">\ud83d\udee1\ufe0f Defence and General Engineering<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Defence applications include <strong>strong alloy plates and structural components<\/strong>, while general engineering uses include <strong>food processing equipment, pipes and tubes, and high\u2011stress mechanical parts<\/strong>. The alloy is also used in <strong>aircraft fuel tank brackets and non\u2011primary aerospace structures<\/strong> where its strength\u2011to\u2011weight ratio and corrosion resistance are advantageous.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83c\udfd7\ufe0f Extruded Profiles and Tubing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Because 6351 T6 is commonly supplied as <strong>extruded bar, rod, tube and profile<\/strong>, it is frequently specified for <strong>structural framing, handrails, support members and general extruded sections<\/strong> in construction and industrial equipment.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"afb-block dont-miss-block\"><h3 class=\"afb-title\">Don&#039;t Miss<\/h3><a href=\"https:\/\/aluminiummagazine.com\/mag\/aluminium\/cylinder\/aluminium-cylinder-heads.html\" class=\"dont-miss-link\"><div class=\"dont-miss-thumb\" role=\"img\" aria-label=\"Thumbnail\" style=\"background-image:url('https:\/\/aluminiummagazine.com\/mag\/wp-content\/uploads\/2026\/09\/aluminium-cylinder-head-heat-fatigue.jpg'); background-size: cover; background-position: center; aspect-ratio: 220\/130;\"><\/div><div class=\"dont-miss-content\"><h4 class=\"dont-miss-title\"><strong>Did You Know Why Aluminium Is Used for Cylinder Heads?<\/strong><\/h4><\/div><\/a><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Fabrication &amp; Workability \u2013 Quick Guide<\/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\">Aspect<\/th><th>Recommendation<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Welding<\/strong><\/td><td>Excellent \u2013 MIG and TIG suitable; use 4043 filler (primary) or 5356 (alternative)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Machining<\/strong><\/td><td>Good in T5 and T6 tempers; use appropriate cutting tools and lubrication<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Forming<\/strong><\/td><td>Very good in softer tempers (O, T4); limited in T6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Extrusion<\/strong><\/td><td>Moderate \u2013 suitable for structural profiles, not ultra\u2011thin complex shapes<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Heat treatment<\/strong><\/td><td>Solution treat and artificially age to T6; T651 available for stress\u2011relieved stock<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Corrosion protection<\/strong><\/td><td>Often used unpainted in marine atmospheres; anodising possible but not as critical as for 2xxx\/7xxx alloys<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Joining (non\u2011weld)<\/strong><\/td><td>Riveting and bolting are viable; adhesive bonding can supplement welded assemblies<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"afb-block pros-cons-block\"><div class=\"pros-section\"><h4 class=\"afb-subtitle\"><svg class=\"afb-icon\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"><\/path><\/svg> WHY CHOOSE ALUMINIUM 6351 T6?<\/h4><ul><li class=\"pro-item\">\u2713 Higher strength than 6061 T6 &#8211; 295 MPa minimum UTS vs. 260 MPa for 6061 T6<\/li><li class=\"pro-item\">\u2713 Excellent weldability &#8211; MIG, TIG and brazing all suitable; weld joints retain good integrity<\/li><li class=\"pro-item\">\u2713 Excellent corrosion resistance &#8211; suitable for marine and offshore service<\/li><li class=\"pro-item\">\u2713 Good machinability in T5 and T6 tempers<\/li><li class=\"pro-item\">\u2713 Very good formability in softer tempers<\/li><li class=\"pro-item\">\u2713 Moderate extrudability &#8211; practical for structural profiles and tubing<\/li><li class=\"pro-item\">\u2713 Heat treatable &#8211; T6 provides a stable high-strength condition<\/li><li class=\"pro-item\">\u2713 Good fatigue strength &#8211; approximately 90 MPa, suitable for cyclic structural loading<\/li><li class=\"pro-item\">\u2713 Versatile product forms &#8211; bar, rod, tube, profile and plate available<\/li><\/ul><\/div><div class=\"cons-section\"><h4 class=\"afb-subtitle\"><svg class=\"afb-icon\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2a2 2 0 0 1 2 2v7a2 2 0 0 1-2 2h-2\"><\/path><\/svg> CONS<\/h4><ul><li class=\"con-item\">\u2715 Lower strength than 7xxx alloys &#8211; not a substitute for 7075 or 7050 in highly stressed airframe applications<\/li><li class=\"con-item\">\u2715 Strength loss in weld heat-affected zone &#8211; inherent to heat-treatable 6xxx alloys; joint design must account for this<\/li><li class=\"con-item\">\u2715 Moderate extrudability &#8211; more demanding than 6061 for complex thin-wall profiles<\/li><li class=\"con-item\">\u2715 Anodising response &#8211; good but not as uniform or aesthetically critical as 6061 in decorative applications<\/li><li class=\"con-item\">\u2715 Limited formability in T6 &#8211; forming is best performed in O or T4 temper before final heat treatment<\/li><\/ul><\/div><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Aluminium 6351 T6 (Aluminum 6351 T6) is the <strong>high\u2011strength structural specialist of the 6000 series<\/strong> \u2013 an alloy that bridges the gap between the familiarity of 6061 and the higher performance of 6082. It offers <strong>295 MPa minimum tensile strength<\/strong>, <strong>excellent weldability with standard MIG and TIG methods<\/strong>, and <strong>marine\u2011grade corrosion resistance<\/strong>, making it a proven choice for boat hulls, scuba tanks, truck bodies, defence structures, bridges and extruded structural profiles.<\/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<p class=\"wp-block-paragraph\">From the shipyards of the marine industry to the fabrication shops of transport and defence engineering, Aluminium 6351 T6 provides the strength, weldability and corrosion reliability that structural fabricators demand. It is not a high\u2011temperature aerospace alloy like 7050, nor a free\u2011machining specialist like 6262 \u2013 it is the <strong>practical structural 6xxx alloy<\/strong> for engineers who need more strength than 6061 without sacrificing weldability or corrosion resistance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your application requires a weldable, corrosion\u2011resistant aluminium alloy with higher strength than 6061 for structural service, Aluminium 6351 T6 is the proven, practical solution.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/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><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 6351 T6 \u2013 also known as Aluminum 6351 T6 \u2013 is a heat\u2011treatable aluminium\u2011magnesium\u2011silicon alloy belonging to the 6000 series. While the broader 6xxx family is valued for balanced properties, 6351 T6 is specifically recognised for delivering higher strength than 6061 while retaining excellent weldability, good corrosion resistance and moderate extrudability. In the T6 &#8230; <a title=\"Aluminium 6351 T6: The High\u2011Strength Structural Alloy for Marine and Transport Applications\" class=\"read-more\" href=\"https:\/\/aluminiummagazine.com\/mag\/aluminium\/aluminium-6351-t6-structural-alloy.html\" aria-label=\"Read more about Aluminium 6351 T6: The High\u2011Strength Structural Alloy for Marine and Transport Applications\">Read more<\/a><\/p>\n","protected":false},"author":12,"featured_media":19689,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[721],"tags":[],"class_list":["post-19688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aluminium"],"_links":{"self":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/19688","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=19688"}],"version-history":[{"count":1,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/19688\/revisions"}],"predecessor-version":[{"id":19690,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/posts\/19688\/revisions\/19690"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/media\/19689"}],"wp:attachment":[{"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/media?parent=19688"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/categories?post=19688"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminiummagazine.com\/mag\/wp-json\/wp\/v2\/tags?post=19688"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}