Tool Steel D2 vs A2: Which Die Steel for Your Application?
D2 provides maximum wear resistance for cutting and blanking operations. A2 offers better toughness and dimensional stability with minimal distortion during air hardening, ideal for precision tooling.
Side-by-Side Property Comparison
| Property | Tool Steel D2 | Tool Steel A2 |
|---|---|---|
| Tensile Strength | 862 MPa (125 ksi) | 896 MPa (130 ksi) |
| Yield Strength | 690 MPa (100 ksi) | 724 MPa (105 ksi) |
| Hardness | 58-62 HRC | 57-62 HRC |
| Density | 7.70 g/cm³ | 7.86 g/cm³ |
| Machinability Rating | 27/100 | 40/100 |
| Thermal Conductivity | 20.0 W/m·K | 24.0 W/m·K |
| Melting Point | 1,421 °C | 1,420 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
Key Differences
| Property | Tool Steel D2 | Tool Steel A2 | Winner |
|---|---|---|---|
| Wear Resistance | Excellent | Good | Tool |
| Toughness | Low | Good | Tool |
| Dimensional Stability | Good | Excellent (air harden) | Tool |
| Hardness | 58-62 HRC | 57-62 HRC | Tie |
| Machinability | 27/100 | 40/100 | Tool |
| Chromium Content | 12% (semi-stainless) | 5% | Tool |
Which Material Should You Choose?
Choose Tool Steel D2 when:
- Blanking and stamping dies
- Long-run cutting tools
- Parts requiring maximum wear life
- Slitters and forming rolls
- Gauges and wear surfaces
Choose Tool Steel A2 when:
- Precision tooling with tight tolerances
- Punches requiring toughness
- Trimming dies
- Plastic mold components
- Parts needing minimal heat-treat distortion
Not Sure Which Material to Choose?
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