AISI 8620 Round Bar (UNS G86200)
AISI 8620 Round Bar is a nickel–chromium–molybdenum alloy steel widely used for case-hardening applications. It offers an excellent combination of core toughness and surface hardness after carburizing, making it ideal for components that require high wear resistance on the surface while maintaining a tough, ductile core. This grade is extensively used in automotive, gearbox, and heavy engineering industries.
Key Features
- Ni–Cr–Mo alloy steel with excellent hardenability
- Outstanding response to carburizing and case hardening
- Tough and ductile core with a hard, wear-resistant surface
- Good machinability in annealed condition
- Excellent fatigue and impact resistance
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| EN | 20NiCrMo2-2 |
| DIN | 1.6523 |
| JIS | SNCM220 |
| IS | 20NiCrMo2 |
Sizes
- Diameter: 12 mm to 600 mm
- Length: 3 m, 6 m, or cut-to-length
- Custom sizes available on request
AISI 8620 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.18 – 0.23 |
| Nickel (Ni) | 0.40 – 0.70 |
| Chromium (Cr) | 0.40 – 0.60 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Manganese (Mn) | 0.70 – 0.90 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
8620 Mechanical Properties
| Property | Value |
|---|---|
| Core Tensile Strength | 800 – 1000 MPa |
| Core Yield Strength | 550 – 700 MPa |
| Elongation | 15 – 20% |
| Surface Hardness | 58 – 62 HRC |
| Core Hardness | 28 – 35 HRC |
UNS G86200 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1415°C |
| Thermal Conductivity | 42.7 W/m·K |
| Modulus of Elasticity | 205 GPa |
Types of AISI 8620 Round Bar
- Hot Rolled Round Bar
- Forged Round Bar
- Peeled Round Bar
- Turned & Polished Round Bar
- Carburized & Heat Treated Round Bar
Applications
- Gears, pinions, and sprockets
- Gear shafts and transmission components
- Camshafts and crankshafts
- Automotive and tractor parts
- Heavy-duty machinery components
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