What is 718 Tool Steel?
718 tool steel is a high-performance alloy with premium plastic mold steel. This comprehensive guide covers chemical composition, mechanical properties, and machining characteristics per GB/T standards.
Chemical Composition
| Element | Content (%) | Standard |
|---|---|---|
| C | 0.28-0.40 | ASTM/GB |
| Cr | 1.40-2.00 | ASTM/GB |
| Mo | 0.30-0.55 | ASTM/GB |
| Ni | 0.80-1.20 | ASTM/GB |
| Fe | Balance | ASTM/GB |
Mechanical Properties
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥1030 MPa | GB/T |
| Yield Strength | ≥785 MPa | GB/T |
| Elongation | ≥5% | GB/T |
| Hardness | 290 HV | HV |
| Density | 7.85 g/cm³ | 20°C |
Key Features
- High hardness and wear resistance
- Excellent toughness
- Good hardenability
- Suitable for heat treatment
- Excellent dimensional stability
Applications
- Cutting tools and dies
- Mold making
- Punches and forming tools
- High-wear components
Machinability
718 tool steel has moderate machinability in annealed condition. Recommended: Carbide tools, cutting speed 50-100 m/min, feed 0.10-0.25 mm/rev.
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