产品介绍：
JB/T9860.1-1999 Purity W1≥99.95%Specific gravity ≥ 19.1g/cm3～19.3g/cm3Crystal grain number ≥ 10000 PCS / mm2Hardness HRA ≥ 71-74 Size allowable tolerance d.h±0.05mm (It can produce the goods according to the client’s coming drawings.)Seat nail material is low carbon steel whose carbon content is equal to or less than 0.10%.The copper purity of copper welding material is equal to or larger than 99.95%.Welding point strength ≥ 83MPaIt strictly produces the goods according to P. R. China Mechanical Industry Standard.JB/T9860.1-1999 产品数量 月产量１０００万片 型号3.0mm-10.0mm电寿命10（万次）
