Gr9 titanium alloy is a low alloying near α titanium alloy, the nominal composition is Ti-3Al-2.5V, is used as cold processing pipe applications and developed, has good cold formability and welding properties, room temperature strength is 20%~50% higher than industrial pure titanium, has good corrosion resistance in many media. Gr9 has better welding performance and cold forming performance than TC4 alloy.

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When alloying elements are added to steel, iron and carbon, the basic components of steel, interact with alloying elements. The purpose of steel alloying is to improve the microstructure and properties of steel by the interaction of alloying elements with iron and carbon and the influence on the phase diagram of iron and carbon and the heat treatment of steel.