... Gr3,Gr4,Gr5,Gr7,Gr9 Standard ASTM B863,GB/T 3623-1998Specification 0.03mm ~ 7.0mm Delivery ... Surface 1. Black: The surface with oxide; 2. White: ... treatment, the surface is the material color, glossy.Features 1.Toughness, light weight, 2. High property of acid and ... welding materials, etc.Yield Strength >=138MpaElongation >=20% ERTi-1 titanium wire