Material

Steel  B2

Size

Dia.  20 – 80 mm

Composition %

C 0.72-1.05, Mn 0.30-1.20, Si 0.15-0.35, Cr 0.20-0.80, P / S ≤0.035, Ni ≤0.25

Hardness

60 – 64 HRC

Breakage

0.5% Max

Impact

14 J/cm2 min

Tolerance (mm)

20 / 25 / 30 / 40 / 50 mm Balls:   +2 / -1

60 / 65 mm Balls:                      +2 / -1.5

70 / 75 / 80 mm Balls:                +3 / -2