... service life, resistance to corrosion. 1. Grand:W1,W22. Purity :>=99.95%3. Characteristic:Melting Point: 3410 Degrees CelsiusBoiling Point: 5927 ... life, resistance to corrosion..6. Chemical composition Main Comp.W≥99.98Other Content≤Fe0.0026Al0.0006Si0.001Ca0.001Ni0.0009O0.0018Cu0.0005N0 ... , mainly used to guns, artillery, rockets, satellite, airplane and ship. 99.95% Round Tungsten Bar