Choosing the right steel grade for your injection mold
| Grade | Hardness (HRC) | Toughness | Polishability | Corrosion | Best For |
|---|---|---|---|---|---|
| P20 | 28-32 | Good | Fair | Low | General purpose, low volume |
| H13 | 44-52 | Excellent | Good | Low | High temp, aluminum die cast |
| 420SS | 48-52 | Fair | Excellent | Excellent | Corrosive plastics (PVC) |
| S7 | 54-56 | Excellent | Fair | Low | High impact, cold heading |
| NAK80 | 37-43 | Good | Excellent | Medium | High polish, lenses |