weld and fabricability. "This alpha-beta alloy is the workhorse alloy of the titanium industry. The alloy is fully heat treatable in section sizes up to 15 mm and is used up to approximately 400 °C (750 °F). Since it is the most commonly used alloy – over 70% of all alloy grades melted are a sub-grade of Ti6Al4V, its uses span many aerospace airframe and engine component uses and also major non-aerospace applications in the marine, offshore and power generation industries in particular." "Applications: Blades, discs, rings, airframes, fasteners, components. Vessels, cases, hubs, forgings. Biomedical implants." Generally, Ti-6Al-4V is used in applications up to 400 degrees Celsius. It has a density of roughly 4420 kg/m3, Young's modulus of 120 GPa, and tensile strength of 1000 MPa. By comparison, annealed type 316 stainless steel has a density of 8000 kg/m3, modulus of 193 GPa, and tensile strength of 570 MPa. Tempered 6061 aluminium alloy has a density of 2700 kg/m3, modulus of 69 GPa, and tensile strength of 310 MPa, respectively. Ti-6Al-4V standard specifications include: AMS: 4911, 4928, 4965, 4967, 6930, 6931, T-9046, T9047 ASTM: B265, B348, F1472 MIL: T9046 T9047 DMS: 1592, 1570 Grade 6 contains 5% aluminium and 2.5% tin. It is also known as Ti-5Al-2.5Sn. This alloy is used in airframes and jet engines due to its good weldability, stability and strength at elevated temperatures. Grade 7 contains 0.12 to 0.25% palladium. This grade is similar to Grade 2. The small quantity of palladium added gives it enhanced crevice corrosion resistance at low temperatures and high pH. Grade 7H is identical to Grade 7 with enhanced corrosion resistance. Grade 9 contains 3.0% aluminium and 2.5% vanadium. This grade is a compromise between the ease of welding and manufacturing of the "pure" grades and the high strength of Grade 5. It is commonly used in aircraft tubing for hydraulics and in athletic equipment. Grade 11 contains 0.12 to 0.25% palladium. This grade has enhanced corrosion resistance. Grade 12 contains 0.3% molybdenum and 0.8% nickel. Grades 13, 14, and 15 all contain 0.5% nickel and 0.05% ruthenium. Grade 16 contains 0.04 to 0.08% palladium. This grade has enhanced corrosion resistance. Grade 16H contains 0.04 to 0.08% palladium. Grade 17 contains 0.04 to 0.08% palladium. This grade has enhanced corrosion resistance. Grade 18 contains 3% aluminium, 2.5% vanadium and 0.04 to 0.08% palladium. This grade is identical to Grade 9 in