Gcr15(AISI 52100) Bearing Steel Balls is magnetic,HRC is 60-66. 1.Material: AISI E52100 2.Chemical component( % for reference only):C:0.95-1.10;Si:0.15-0.35;Mn≤0.50;P≤0.025;S≤0.025;Cr:1.30-1.60 3.Grade name:G5,G10,4.Diameter 2.0mm,2.381mm,3.175mm,3.969mm,4.763mm,5.953mm,6.35mm5.HRC: 62-66...