Pipe, sheet made of titanium grade 38
European titanium alloy grade 38 belongs to alpha + beta high-strength alloys. It is developed in the 90s. It was conceived as alloy of a lower cost, for recycling streams with a high content of oxygen, salts of iron and chloride. In consists of 4% of aluminium, 2.5% of vanadium, 1.5% of iron. Iron reduces an amount of vanadium needed to protect against corrosion. Products made of an alloy can be used when working at high temperatures (up to 600 ° F). Alloy can be successfully welded by conventional methods of arc welding under a protection of inert gas. Acetylene welding, in this case, is not applicable.
Percentage composition of alloy according to ASTM
|basis||3.5- 4.5||2 — 3||0.2 — 0.3||≤ 0,03||≤ 0,03||1.2- 1.8||≤0.0015||≤ 0,03|
Grade 38 (Ti 4Al-2.5 V) has good plasticity. Its structure is similar to grade 9 (Ti-3Al-2.5 V). Its strength properties are similar to titanium alloy grade 5 (Ti-6Al-4V).
Impact hardness significantly increases in a temperature range of 200−300°C. The other mechanical properties do not change notably. If annealing occurs at a temperature of above 500 °C after deformation, impact hardness greatly reduces. It is caused by redistribution of oxygen and nitrogen between grain boundaries. It leads to a loss of mechanical properties.
Used in manufacture of airframe hulls, sports cars, vessels and marine equipment, sports equipment.
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