What is AISI4121?
AISI4121 steel is an AISI/SAE standard alloy steel with chromium molybdenum. This comprehensive guide covers chemical composition, mechanical properties, and machining characteristics per AISI/SAE standards.
Chemical Composition
| Element | Content (%) | Standard |
|---|---|---|
| C | 0.20-0.25 | AISI/SAE |
| Cr | 0.40-0.60 | AISI/SAE |
| Mo | 0.15-0.25 | AISI/SAE |
Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥610 MPa | AISI/SAE |
| Yield Strength | ≥420 MPa | AISI/SAE |
| Elongation | ≥15% | AISI/SAE |
| Hardness | 205 HV | HV |
| Density | 7.85 g/cm³ | 20°C |
Key Features
- High strength and toughness
- Good hardenability
- Suitable for heat treatment
- Good machinability in annealed condition
- Widely used in automotive and aerospace
Applications
- Automotive components
- Aerospace parts
- High-strength structural parts
- Gear and shaft components
Machinability
AISI4121 steel has good machinability. Recommended: Carbide tools, cutting speed 80-150 m/min, feed 0.15-0.30 mm/rev.
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