AISI 52100 Round Bar (UNS G52986)
AISI 52100 Round Bar is a high-carbon, chromium alloy steel renowned for its exceptional hardness, wear resistance, and fatigue strength. Commonly referred to as bearing steel, this grade is engineered for precision components where dimensional stability and long service life are critical. AISI 52100 responds extremely well to heat treatment, achieving very high hardness levels with excellent contact fatigue resistance.
Key Features
- High carbon–chromium alloy steel (bearing grade)
- Outstanding wear and abrasion resistance
- Excellent rolling and contact fatigue strength
- High hardness after heat treatment
- Good dimensional stability in hardened condition
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| EN | 100Cr6 |
| DIN | 1.3505 |
| JIS | SUJ2 |
| IS | EN31 |
| GB | GCr15 |
Sizes
- Diameter: 10 mm to 450 mm
- Length: 3 m, 6 m, or cut-to-length
- Precision ground sizes available on request
AISI 52100 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.98 – 1.10 |
| Chromium (Cr) | 1.30 – 1.60 |
| Manganese (Mn) | 0.25 – 0.45 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Iron (Fe) | Balance |
52100 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 900 – 1200 MPa |
| Yield Strength | ~650 MPa |
| Elongation | 8 – 12% |
| Hardness | 58 – 65 HRC |
UNS G52986 Physical Properties
| Property | Value |
|---|---|
| Density | 7.81 g/cm³ |
| Melting Point | ~1420°C |
| Thermal Conductivity | 46.6 W/m·K |
| Modulus of Elasticity | 210 GPa |
Types of AISI 52100 Round Bar
- Hot Rolled Round Bar
- Forged Round Bar
- Peeled Round Bar
- Turned & Polished Round Bar
- Ground & Polished Bearing Steel Bar
Applications
- Ball, roller, and needle bearings
- Bearing races and rings
- Precision shafts and spindles
- Automotive and industrial bearing components
- High-wear machine parts and tools
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