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.
| 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 | ±0.01 mm | ±0.01 mm |
| 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 |
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