Bearing Steel
Grade 52100 (GCr15 / SUJ2)
High hardness and wear resistance bearing steel - the most widely produced bearing steel globally.
High hardness - Superior wear resistance
Global standard - Most widely used
Precision applications
Bearing Steel
Grade 52100 (GCr15 / SUJ2)
Grade 52100, also known as GCr15 (Chinese standard) or SUJ2 (Japanese standard), is the most widely produced bearing steel globally. This high-carbon chromium steel offers exceptional hardness and wear resistance, making it ideal for precision bearing applications.
Key Features
- High hardness - Excellent wear resistance
- Superior fatigue resistance - Long service life
- Good dimensional stability - Maintains precision
- Excellent hardenability - Uniform hardness distribution
- High compressive strength
- Good machinability in annealed condition
Applications
- Ball bearings and rollers
- Bearing rings (inner and outer races)
- Precision bearing components
- High-speed bearing applications
- Automotive bearings
- Industrial machinery bearings
- Aerospace bearing components
Heat Treatment
- Annealing: 780-820°C
- Hardening: 840-870°C, oil quench
- Tempering: 150-200°C
- Final hardness: 60-65 HRC
Chemical Composition
- Carbon (C): 0.95-1.05%
- Chromium (Cr): 1.30-1.65%
- Manganese (Mn): 0.25-0.45%
- Silicon (Si): 0.15-0.35%
- Phosphorus (P): 0.025% max
- Sulfur (S): 0.025% max
Mechanical Properties (Heat Treated)
- Tensile Strength: 2000+ MPa
- Hardness: 60-65 HRC
- Compressive Strength: 2500+ MPa
- Fatigue Strength: Excellent
Equivalent Grades
- AISI/SAE: 52100
- Chinese (GB): GCr15
- Japanese (JIS): SUJ2
- German (DIN): 100Cr6
- British (BS): EN31
Available Forms
- Seamless tubes and pipes
- Cold drawn seamless (CDS)
- Precision ground tubes
- Round bars
- Custom sizes available