... for the sake of its high tolerance strength, hardness, yield strength, elongation, crush resistance, torsion resistance and shearing ... ). Main material are CK45, AISI 4140&4130, 5CrMnMo, 40Cr, 42CrMo, 20Cr2Ni4, 5CrNiMo, 15CrNiMo, 20CrNiMo, 35CrMo, 40CrNiMo, etc. (8). ... and guide!Specifications:Material standard:GB, ASTM, AISI, ASME, DIN, BS, EN,JISMaterial:Carbon Steel, Stainless Steel, Alloy ...