Standard: SAE Chemical Composition(%): C 0.45-0.75 Mn 0.40-1.20 Si 0.10-0.30 S <0.04 P <0.04 Hardness: HRC 36-48 Hardness Deviation: Max Deviation ?.0 HRC Tensile Strength: 1.0mm: 1750-2150 Mpa 1.5mm: 1250-1450 Mpa Metallographical structure: Deformation Pearlite Min Density(Can be determined By alcoholic displacement): 7.8g/cm3