... Stainless Steel|Alloy SteelMaterial Standard:GB|ASTM|AISI|ASME|DIN|BS|EN|JISProduct Name:Forged Steel RingTechanical Test: ... ). Main material are CK45, AISI 4140&4130, 5CrMnMo, 40Cr, 42CrMo, 20Cr2Ni4, 5CrNiMo, 15CrNiMo, 20CrNiMo, 35CrMo, 40CrNiMo, etc. (8). Regularly ... and guide!Specifications:Material standard:GB, ASTM, AISI, ASME, DIN, BS, EN,JISMaterial:Carbon Steel, Stainless Steel, Alloy Steel ...