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High-C Cr Bearing Steel Spec Table
High-C Cr Bearing Steel KS Specifications — 1 sizes
KS D 3525
Bearing steel represented by SUJ2 (52100) with high hardness and fatigue life, used for ball and roller bearings.
Practical Notes
- SUJ2 (52100) is the global standard bearing steel. HRC 60–65 after quenching with excellent hardness and fatigue life.
- Spherical machining and grinding precision directly affect bearing life. Ultra-precision surfaces of Ra ≤0.025μm are required.
KSHigh-C Cr Bearing Steel
1 sizes| Name | Type | Tensile | Yield | Hardness | Use |
|---|---|---|---|---|---|
| SUJ2 | Bearing | - | - | HRC60~65(Heat TreatedAfter) | Bearing, Bearing, Bearing |
Key Features
- STB2 (SUJ2) representative; C 1.0% + Cr 1.5% achieves HRC 62–64 ultra-hardness and fatigue resistance
- Steel grade designed to maximize contact fatigue life (L10) of rolling elements and raceways
- Strict cleanliness (oxide inclusion) control; vacuum degassing (VD) steelmaking required
Key Applications
Ball bearings (inner/outer ring/balls), roller bearings, linear guide rails, ball screw nuts, precision pins
FAQ
Chemical composition of SUJ2?
C: 0.95–1.10%, Cr: 1.30–1.60%, Si: 0.15–0.35%, Mn: ≤0.50%. High carbon + chromium achieves extreme hardness (HRC 60–65) and excellent fatigue life.