{"id":3971,"date":"2026-09-15T23:45:57","date_gmt":"2026-09-15T20:45:57","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3971"},"modified":"2026-09-17T23:06:47","modified_gmt":"2026-09-17T20:06:47","slug":"ti-grade-4-ti-grade-5-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/ti-grade-4-ti-grade-5-difference\/","title":{"rendered":"What Is the Difference Between Ti Grade 4 and Ti Grade 5?"},"content":{"rendered":"

Ti Grade 4<\/strong> is the strongest grade of commercially pure titanium. Ti Grade 5<\/strong> is the standard grade of alloyed titanium (Ti6Al4V). These are the two titanium classes that come closest to each other in strength \u2014 which is why the choice is sometimes debated.<\/p>\n

By impurity, or by alloying?<\/h3>\n

Grade 4 takes its strength from oxygen<\/strong>: according to our datasheet oxygen is \u22640.40% and iron \u22640.50% \u2014 the highest limits among the pure titanium grades. It contains no alloying elements.<\/p>\n

Grade 5 contains 5.50\u20136.75% aluminium<\/strong> and 3.50\u20134.50% vanadium<\/strong>. That moves the material into an alpha + beta structure and makes it hardenable by heat treatment<\/strong> \u2014 which is not possible with Grade 4.<\/p>\n

The figures show a clear step between them: the yield strength of Grade 4 is \u2265485 N\/mm\u00b2<\/strong> and its tensile strength \u2265550 N\/mm\u00b2<\/strong>. In Grade 5 those rise to \u2265830<\/strong> and \u2265895 N\/mm\u00b2<\/strong>. Hardness rises from \u2264200 HB to \u2265310 HB.<\/p>\n

The advantage of Grade 4 is on the corrosion side: being unalloyed, its corrosion resistance is somewhat better than that of Grade 5 and its weldability is higher. It is also preferred in some medical applications because it contains no aluminium or vanadium.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nTi Grade 4<\/th>\nTi Grade 5 (Ti6Al4V)<\/th>\n<\/tr>\n<\/thead>\n
Aluminium (Al)<\/td>\n\u2014<\/td>\n5.50 \u2013 6.75%<\/td>\n<\/tr>\n
Vanadium (V)<\/td>\n\u2014<\/td>\n3.50 \u2013 4.50%<\/td>\n<\/tr>\n
Oxygen (O)<\/td>\n\u2264 0.40%<\/td>\n\u2264 0.20%<\/td>\n<\/tr>\n
Iron (Fe)<\/td>\n\u2264 0.50%<\/td>\n\u2264 0.20%<\/td>\n<\/tr>\n
Nitrogen (N)<\/td>\n\u2264 0.05%<\/td>\n\u2264 0.05%<\/td>\n<\/tr>\n
Hardenable by heat treatment<\/td>\nNo<\/td>\nYes<\/td>\n<\/tr>\n
Tensile strength Rm<\/td>\n\u2265 550 N\/mm\u00b2<\/td>\n\u2265 895 N\/mm\u00b2<\/td>\n<\/tr>\n
Yield strength Rp0.2<\/td>\n\u2265 485 N\/mm\u00b2<\/td>\n\u2265 830 N\/mm\u00b2<\/td>\n<\/tr>\n
Elongation<\/td>\n\u2265 15%<\/td>\n\u2265 10%<\/td>\n<\/tr>\n
Hardness<\/td>\n\u2264 200 HB<\/td>\n\u2265 310 HB<\/td>\n<\/tr>\n
Density<\/td>\n4.51 g\/cm\u00b3<\/td>\n\u2265 4.43 g\/cm\u00b3<\/td>\n<\/tr>\n
Modulus of elasticity<\/td>\n106 kN\/mm\u00b2<\/td>\n114 kN\/mm\u00b2<\/td>\n<\/tr>\n
Thermal conductivity<\/td>\n18 W\/m\u00b7K<\/td>\n\u2265 7.1 W\/m\u00b7K<\/td>\n<\/tr>\n
UNS<\/td>\nR50700<\/td>\nR56400<\/td>\n<\/tr>\n
AMS<\/td>\n4901 \u00b7 4921<\/td>\n4928 \u00b7 4911<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n

Which one, and when?<\/h3>\n

Ti Grade 4 is preferred<\/strong> \u2014 dental implants and surgical screws, high-strength parts where corrosion comes first, welded pressure vessels, aircraft skin and piping systems. It takes the place of Grade 5 in medical and chemical applications that require an unalloyed material.<\/p>\n

Ti Grade 5 is required<\/strong> \u2014 aircraft structural parts, engine components, landing gear members, highly stressed fasteners, orthopaedic implants. If the strength-to-weight ratio is critical, Grade 4 is not enough.<\/p>\n

Neighbouring grades<\/h3>\n

For the softer pure titanium grades, see our Ti Grade 1 \u2013 Grade 2 comparison<\/a>; for medical applications, our Ti Grade 5 \u2013 Grade 5 ELI article<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

Ti Grade 4 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Ti Grade 5 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Ti Grade 4 is the strongest pure titanium grade; Grade 5 is alloyed and can be hardened by heat treatment.<\/p>\n","protected":false},"author":1,"featured_media":3423,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between Ti Grade 4 and Ti Grade 5? - Defence Metal<\/title>\n<meta name=\"description\" content=\"Ti Grade 4 is the strongest pure titanium grade; Grade 5 is alloyed and can be hardened by heat treatment.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/ti-grade-4-ti-grade-5-difference\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the Difference Between Ti Grade 4 and Ti Grade 5? 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