Bearing Steel
Bearing Steel
Bearing steel is special steel featuring high wear resistance and rolling fatigue strength. High-carbon chromium bearing steel, engineering steel and some types of stainless steel and heat resistant steel are used as materials of bearings and for other purposes.
Features of Bearing Steel
- High Hardness & Wear Resistance: Contains high carbon (0.95–1.10%) and chromium (1.3–1.6%) for extreme surface hardness (60–65 HRC) and resistance to abrasive wear in high-pressure environments.
- Exceptional Fatigue Strength: Optimized microstructure and alloy design (e.g., silicon, manganese) prevent crack initiation under cyclic loads, ensuring longevity in rotating applications.
- Controlled Purity & Uniformity: Ultra-low oxygen and sulfur content (<15 ppm) minimizes inclusions, while fine carbide distribution ensures consistent performance under stress.
Parameter of Bearing steel
| Topic | Content |
| Standard | – International Standards: ASTM (e.g., ASTM A295, AISI 52100); GB (e.g., GB/T 18254); JIS (e.g., JIS G4805); DIN (e.g., DIN EN ISO 683-17); ISO (e.g., ISO 683-17) – Industry Standards: SAE, EN, ABMA, etc. |
| Grades | – ASTM: 52100, 440C, M50 – GB: GCr15, GCr18Mo, GCr15SiMn – JIS: SUJ2, SUJ3, SUJ5 – DIN: 100Cr6, 100CrMn6, 105Cr4 – ISO: 100Cr6, 100CrMn6, 105Cr4 |
| Classification | 1. By Composition: – High-Carbon Chromium Steel (e.g., 52100, GCr15) – Stainless Bearing Steel (e.g., 440C, SUJ5) – High-Temperature Bearing Steel (e.g., M50) 2. By Application: – General-Purpose Bearings (e.g., 52100, SUJ2) – High-Temperature Bearings (e.g., M50) – Corrosion-Resistant Bearings (e.g., 440C) 3. By Heat Treatment: Through-hardening, case-hardening, and induction-hardening steel |
| Size | – Bars: Diameter 10~300mm (round steel), standard lengths of 6m/12m – Tubes: Outer diameter 20~200mm, wall thickness 5~50mm – Rings and Races: Custom sizes based on bearing design – Wire: Diameter 1~10mm for small bearings and precision applications |
Industries Using Steel
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