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Ball Bearing Material

Standard material for rings and balls is a vacuum degassed high carbon chromium steel allowing for high efficiency, low torque, low noise level and long bearing life.For bearings requiring anti-corrosion or heat-resistance properties, martensitic stainless steel is used.
CHEMICAL COMPOSITION OF BEARING MATERIALS
MATERIAL
HIGH CARBON CHROMIUM STEEL STAINLESS STEEL
SYMBOL SUJ2
SUS440C KS440 (ACD34)
CHEMICAL COMPOSITION % C
0.95~1.10 0.95~1.20
0.60~0.75
Si 0.15~0.35 ≤1.00 ≤1.00
Mn ≤0.50 ≤1.00 ≤1.00
P ≤0.025 ≤0.040 ≤0.030
S ≤0.025 ≤0.030 ≤0.020
Cr 1.30~1.60 16.00~18.00 11.50~13.00
Mo ≤0.08 ≤0.75 ≤0.30
EQUIVALENT SAE52100, 100Cr6 AISI440C, X102CrMo17 X65Cr13