... , black surface or millingAnnealed, hardness , HB207~255Width, 205~610mm Thickness, 20~300mm 3.GeneralThorough hardenability, high tough resistance, high oxidation resistance4.Chemical ... analysisCSiMnCrVMo1.40~1.600.30~0.500.20~0.5011.0~13.0≤1.100.70~1.205 ...