What is 45 Steel?
45 steel is a carbon structural steel with quality carbon steel. This comprehensive guide covers chemical composition, mechanical properties, and machining characteristics per GB/T standards.
Chemical Composition
| Element | Content (%) | Standard |
|---|---|---|
| C | 0.42-0.50 | ASTM/GB |
| Mn | 0.50-0.80 | ASTM/GB |
| P | ≤0.035 | ASTM/GB |
| S | ≤0.035 | ASTM/GB |
| Si | 0.17-0.37 | ASTM/GB |
| Fe | Balance | ASTM/GB |
Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥600 MPa | GB/T 699 |
| Yield Strength | ≥355 MPa | GB/T 699 |
| Elongation (in 50mm) | ≥16% | GB/T 699 |
| Hardness (Vickers) | 185 HV | GB/T 4340 |
| Density | 7.85 g/cm³ | At 20°C |
Key Features
- Good mechanical properties for structural applications
- Suitable for heat treatment
- Good machinability in annealed condition
- Widely used in construction and manufacturing
- Cost-effective carbon steel
Common Applications
- Structural components and frames
- Machine parts and shafts
- Bolts and fasteners
- Automotive components
- Construction equipment
Machinability
45 steel has good machinability. Recommended: Carbide tools, cutting speed 100-180 m/min, feed 0.15-0.35 mm/rev, soluble oil coolant.
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