Standard: SAE Chemical Composition(%): C 0.85-1.20 Mn 0.60-1.20 Si 0.40-1.20 S <0.05 P <0.05 Hardness: HRC 40-50 Hardness Deviation: Max Deviation ?.0 HRC Metallographical structure: Even Tempered Martensite Min Density(Can be determined By alcoholic displacement): >7.2g/cm3