CK40 Round Bar (UNS G10400)
CK40 Round Bar is a medium carbon steel grade specified under EN 10083 standards and internationally recognized as UNS G10400. With a carbon content of approximately 0.40%, CK40 steel provides higher strength than CK35 while still maintaining good toughness and machinability. It is commonly supplied in hot rolled or normalized condition and is suitable for mechanical parts subjected to moderate to high stresses.
Key Features
- Medium carbon content for improved strength
- Good toughness and wear resistance
- Excellent machinability in normalized condition
- Suitable for heat treatment and surface hardening
- Reliable performance for mechanical engineering applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| EN | CK40 / 1.1186 |
| DIN | CK40 |
| ASTM / SAE | AISI 1040 |
| JIS | S40C |
| IS | EN8D |
Sizes
- Diameter: 10 mm to 600 mm
- Length: 3 m, 6 m, or cut-to-length
- Custom sizes available on request
CK40 Round Bar Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.37 – 0.44 |
| Manganese (Mn) | 0.50 – 0.80 |
| Silicon (Si) | ≤ 0.40 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.045 |
CK40 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 600 – 750 MPa |
| Yield Strength | ≥ 340 MPa |
| Elongation | ≥ 16% |
| Hardness | 170 – 210 HB (Normalized) |
UNS G10400 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1460°C |
| Thermal Conductivity | 49 W/m·K |
| Modulus of Elasticity | 210 GPa |
Types of CK40 Carbon Steel Round Bar
- Hot Rolled Round Bar
- Bright Drawn Round Bar
- Forged Round Bar
- Turned & Polished Round Bar
- Heat Treated Round Bar
Applications
- Shafts and axles
- Gears and pinions
- Bolts, studs, and crankshafts
- Automotive and machinery components
- Structural and mechanical fabrication
Reviews
There are no reviews yet.