{"id":3987,"date":"2026-09-16T00:41:58","date_gmt":"2026-09-15T21:41:58","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3987"},"modified":"2026-09-17T23:06:28","modified_gmt":"2026-09-17T20:06:28","slug":"ti-grade-5-aisi-4340-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/16\/ti-grade-5-aisi-4340-difference\/","title":{"rendered":"What Is the Difference Between Ti Grade 5 and AISI 4340?"},"content":{"rendered":"<p><strong>Ti Grade 5<\/strong> (Ti6Al4V) and <strong>AISI 4340<\/strong> frequently come up against each other for the same part in aerospace and defence projects. One is a titanium alloy, the other an alloy steel \u2014 so the comparison is made not at the chemical level but at the level of an <strong>engineering choice<\/strong>.<\/p>\n<h3>Strength, or specific strength?<\/h3>\n<p>In absolute strength AISI 4340 is ahead: according to our datasheets, when hardened and tempered its tensile strength is <strong>1793 MPa<\/strong> and its yield strength <strong>1496 MPa<\/strong>. In Ti Grade 5 those values are <strong>\u2265895<\/strong> and <strong>\u2265830 N\/mm\u00b2<\/strong>.<\/p>\n<p>But the densities are very different. The density of Ti Grade 5 is <strong>\u22654.43 g\/cm\u00b3<\/strong> against roughly 7.85 g\/cm\u00b3 for steel \u2014 that is, titanium is <strong>half the weight<\/strong>. When strength per unit weight (specific strength) is taken into account the two materials come very close, and in some design scenarios titanium moves ahead.<\/p>\n<p>The real decisive difference is elsewhere: <strong>corrosion<\/strong>. AISI 4340 rusts; it requires plating, paint or cadmium\/zinc protection. Ti Grade 5 can be used uncoated in seawater, salt-laden air and many chemicals. On the other hand the modulus of elasticity of titanium is far lower (<strong>114 kN\/mm\u00b2<\/strong> against roughly 205 GPa for steel), so it deflects twice as much under the same load \u2014 a serious constraint if stiffness is critical.<\/p>\n<p>Finally, cost and manufacturing: titanium is markedly expensive, its machining is slow and welding requires a shielding gas environment. 4340 can be machined and heat treated in any workshop.<\/p>\n<h3>Comparison in numbers<\/h3>\n<div style=\"overflow-x:auto;border:1px solid #d7dfe4;background:#fff;margin:10px 0 26px;\">\n<table style=\"border-collapse:collapse;width:100%;font-size:15px;\">\n<thead>\n<tr style=\"background:#DD3333;\">\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">PROPERTY<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">Ti Grade 5 (Ti6Al4V)<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AISI 4340<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Material class<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Titanium alloy<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Alloy steel<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Main elements<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5.50\u20136.75% Al \u00b7 3.50\u20134.50% V<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.65\u20132.00% Ni \u00b7 0.70\u20130.90% Cr \u00b7 0.20\u20130.30% Mo<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Carbon (C)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2264 0.08%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.38 \u2013 0.43%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Tensile strength Rm<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 895 N\/mm\u00b2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1793 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Yield strength Rp0.2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 830 N\/mm\u00b2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1496 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Elongation<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 10%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">10%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Hardness<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 310 HB<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Density<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 4.43 g\/cm\u00b3<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~7.85 g\/cm\u00b3<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Modulus of elasticity<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">114 kN\/mm\u00b2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~205 GPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Corrosion resistance<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Resists seawater uncoated<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Requires plating or paint<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Thermal conductivity<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2265 7.1 W\/m\u00b7K<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">UNS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">R56400<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">G43406<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">AMS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">4928 \u00b7 4911<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">6414 \u00b7 6415 \u00b7 6484<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size:13px;color:#6b7a84;margin-top:-16px;\">Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n<h3>Which one, and when?<\/h3>\n<p><strong>Ti Grade 5 is required<\/strong> \u2014 aircraft and space structures where weight converts directly into performance, marine and offshore equipment, corrosive environments where coating is not possible, medical and prosthetic applications, parts that must be non-magnetic.<\/p>\n<p><strong>AISI 4340 is required<\/strong> \u2014 parts demanding high absolute strength and stiffness such as landing gear and shaft assemblies, gear and spindle applications, anywhere weight is not critical and cost comes first. If the specification calls out <strong>AMS 6414<\/strong> or <strong>AMS 6415<\/strong>, substituting titanium is not an option.<\/p>\n<p>A practical rule: <strong>weight and corrosion \u2192 titanium; stiffness, absolute strength and cost \u2192 4340<\/strong>.<\/p>\n<h3>Neighbouring materials<\/h3>\n<p>For the steps above 4340, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4340-300m-difference\/\">AISI 4340 \u2013 300M<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/300m-aermet-100-difference\/\">300M \u2013 AerMet 100<\/a> comparisons; on the titanium side, our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/ti-grade-2-ti-grade-5-difference\/\">Ti Grade 2 \u2013 Grade 5 article<\/a>.<\/p>\n<div style=\"border:1px solid #d7dfe4;border-left:4px solid #24BEE5;background:#f7fafb;padding:18px 20px;margin:26px 0;\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#20303c;\">Technical datasheets<\/p>\n<p style=\"margin:0 0 6px;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/ti-grade-5-ti6al4v\/\">Ti Grade 5 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n<p style=\"margin:0 0 12px;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-4340\/\">AISI 4340 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n<p style=\"margin:0;color:#6b7a84;font-size:14px;\">Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/contact\/\">Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ti Grade 5 is half the density and corrosion resistant; AISI 4340 is stronger and far more economical.<\/p>\n","protected":false},"author":1,"featured_media":3512,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is the Difference Between Ti Grade 5 and AISI 4340? 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