Seamless Steel Pipe, Steel Plate, Hot Rolled Steel Round Bar manufacturer / supplier in China, offering Hot Forged 42CrMo 42CrMo4 20cr 40cr 20crmo Quenched and Tempered Alloy Structure Steel Drill Hollow Bars, Jianlong Beiman Tianjin Qingdao SAE4340 SAE5120 SAE5140 ISO41cr4 Steel Solid and Hollow Steel Solid and Hollow Steel Rods Exported to Kuwait, Export to Malaysia Used as Oil Petroleum Drlling Tools Scm420 Scm440 Scm435 SAE1010 Peeling Surface Solid Rods and so on.