AISI 5120 Round Bar (UNS G51200)
AISI 5120 Round Bar is a chromium alloy steel primarily used for carburizing and case-hardening applications. With controlled carbon content and chromium addition, this grade delivers a hard, wear-resistant surface with a tough, shock-resistant core after heat treatment. AISI 5120 round bars are widely used in automotive and heavy engineering components where fatigue strength and durability are critical.
Key Features
- Chromium alloy steel with good hardenability
- Excellent carburizing and case-hardening characteristics
- High surface hardness and wear resistance after treatment
- Good core strength and fatigue resistance
- Suitable for mass-production automotive components
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| EN | 20Cr4 |
| DIN | 1.7035 |
| JIS | SCR420 |
| IS | 20Cr4 |
Sizes
- Diameter: 20 mm to 500 mm
- Length: 3 m, 6 m, or cut-to-length
- Custom sizes available on request
AISI 5120 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.17 – 0.23 |
| Manganese (Mn) | 0.70 – 0.90 |
| Chromium (Cr) | 0.70 – 0.90 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
5120 Mechanical Properties
| Property | Value |
|---|---|
| Core Tensile Strength | 850 – 1000 MPa |
| Yield Strength | ~600 MPa |
| Elongation | 12 – 16% |
| Case Hardness | 58 – 62 HRC |
| Core Hardness | 30 – 38 HRC |
UNS G51200 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1420°C |
| Thermal Conductivity | 45.5 W/m·K |
| Modulus of Elasticity | 205 GPa |
Types of AISI 5120 Round Bar
- Hot Rolled Round Bar
- Forged Round Bar
- Peeled Round Bar
- Turned & Polished Round Bar
Applications
- Automotive gears and shafts
- Transmission and differential components
- Pinions, sprockets, and camshafts
- Carburized machine parts
- Heavy engineering and industrial machinery components
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