AISI 5140 Round Bar (UNS G51400)
AISI 5140 Round Bar is a chromium alloy steel with higher carbon content than 5130, providing greater strength, hardenability, and wear resistance. This grade is widely used for components that require good toughness combined with high surface hardness after heat treatment. AISI 5140 responds very well to quenching and tempering, making it suitable for demanding mechanical and structural applications.
Key Features
- Chromium alloy steel with excellent hardenability
- Higher strength and wear resistance than AISI 5130
- Good toughness after quenching and tempering
- Suitable for induction and flame hardening
- Reliable performance under dynamic and cyclic loads
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| EN | 41Cr4 |
| DIN | 1.7035 |
| JIS | SCR440 |
| IS | 40Cr1 |
Sizes
- Diameter: 20 mm to 500 mm
- Length: 3 m, 6 m, or cut-to-length
- Custom sizes available on request
AISI 5140 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.75 – 1.00 |
| Chromium (Cr) | 0.80 – 1.10 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
5140 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 850 – 1000 MPa |
| Yield Strength | 600 – 750 MPa |
| Elongation | 12 – 16% |
| Hardness | 28 – 32 HRC |
UNS G51400 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1425°C |
| Thermal Conductivity | 45.0 W/m·K |
| Modulus of Elasticity | 205 GPa |
Types of AISI 5140 Round Bar
- Hot Rolled Round Bar
- Forged Round Bar
- Peeled Round Bar
- Turned & Polished Round Bar
- Quenched & Tempered (Q&T) Round Bar
Applications
- Heavy-duty shafts and axles
- Gears, pinions, and couplings
- Automotive and tractor components
- Machine and structural parts
- Wear-resistant engineering components
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