AISI D2 & D3 cold work tool steel all belong to ASTM A681-1999 steel material standard. They all is high alloy tool steel. but their chemical composition and mechanical properties are different. as below:
Chemical Composition of D2 VS D3 Tool Steel
| ASTM A681 | C | Si | Mn | Cr | Mo | V | P | S |
| D2 | 1.40～1.60 | 0.10～0.60 | 0.20～0.60 | 11.0～13.0 | 0.70～1.20 | 0.50～1.10 | ≤0.030 | ≤0.030 |
| ASTM A681 | C | Si | Mn | Cr | Mo | V | P | S |
| D3 | 2.00～2.35 | 0.10～0.60 | 0.20～0.60 | 11.0～13.5 | ~ | ~ | ≤0.030 | ≤0.030 |
Mechanical Properties of D2 Tool Steel VS D3 Tool teel
| D2 Tool Steel | D3 Tool Steel | ||
| Properties | Metric | Properties | Metric |
| Density | 7.7 x 1000 kg/m3 | Density | 7.7 x 1000 kg/m3 |
| Melting point | 1421°C | Melting point | 1421°C |
| Izod impact unnotched | 77.0 J | Izod impact unnotched | 77.0 J |
| Poisson’s ratio | 0.27-0.30 | Poisson’s ratio | 0.27-0.30 |
| Thermal expansion(20-100°C) | 10.4 x 10-6/ºC | Thermal expansion | 12 x 10-6/ºC |
Heat Treatment of Tool Steel D2 & D3
| Steel ASTM: D2 | Steel ASTM: D3 |
| Post annealing hardness HBS: 255 | Post annealing hardness HBS: 255 |
| After cold hardness HBS: 269 | After cold hardness HBS: 269 |
| Preheat temperature / C: 816 | Preheat temperature / C: 816 |
| Quenching temperature: 996 C / | salt bath furnace | Quenching temperature: 954 C / | salt bath furnace |
| Quenching temperature / temperature controlled atmosphere furnace: 1010 | Quenching temperature / temperature controlled atmosphere furnace: 968 |
| Holding time /min: 10 ~ 20 | Holding time /min: 10 ~ 20 |
| Quenching medium: air cooling | Quenching medium: Oil |
| Temper temperature / C: 204 | Temper temperature / C: 204 |
| The hardness is larger than HRC: 59 | The hardness is larger than HRC: 61 |
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