... , JIS G 3521-1991, GB 4357-89 1.Steel Grade/Material: 45#, 42A, 42B, 60#, 65#, 65Mn, 70#, 72A, 72B, 80 ... , EN 10270, GB 3206-82, YB/T 5005-934.Chemical Composition MaterialCarbon%Silicon%Manganese%Phosphorus%Sulphur %Chromium%Nickel%Cuprum%10080.080 ...