EN9 Carbon Steel Round Bar (UNS G10550)
EN9 Round Bar is a high carbon steel grade widely used for applications requiring high strength, hardness, and wear resistance. Internationally identified by UNS G10550, EN9 steel typically contains 0.50–0.60% carbon, making it suitable for components subjected to heavy loads and repeated stress. It is commonly supplied in hot rolled or normalized condition and shows excellent response to quenching and tempering heat treatments.
Key Features
- High carbon content for superior strength and hardness
- Excellent wear and abrasion resistance
- Good heat treatability
- Reliable performance under high stress
- Cost-effective solution for heavy-duty engineering parts
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| BS | EN9 |
| EN | C55 / 1.1203 |
| DIN | CK55 |
| ASTM / SAE | AISI 1055 |
| JIS | S55C |
| IS | EN9 |
Sizes
- Diameter: 10 mm to 600 mm
- Length: 3 m, 6 m, or cut-to-length
- Custom sizes available on request
EN9 Round Bar Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.50 – 0.60 |
| Manganese (Mn) | 0.60 – 1.00 |
| Silicon (Si) | ≤ 0.40 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.045 |
EN9 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 650 – 800 MPa |
| Yield Strength | ≥ 380 MPa |
| Elongation | ≥ 12% |
| Hardness | 190 – 230 HB (Normalized) |
UNS G10550 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1460°C |
| Thermal Conductivity | 49 W/m·K |
| Modulus of Elasticity | 210 GPa |
Type of EN9 Carbon Steel Round Bar
- Hot Rolled Round Bar
- Bright Drawn Round Bar
- Forged Round Bar
- Turned & Polished Round Bar
- Heat Treated Round Bar
Applications
- Springs and spring components
- Heavy-duty shafts and axles
- Gears, cams, and pinions
- Agricultural and earthmoving equipment parts
- Automotive and mechanical engineering components
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