| element | Improved performance | |
|---|---|---|
| C | Low carbon | Corrosion resistance（Grain boundary corrosion resistance） |
| High carbon | Strength・Hardness | |
| Mo | Corrosion resistance（Pitting corrosion resistance） | |
| Cu | Acid resistant | |
| Ti・Nb | Corrosion resistance (grain boundary corrosion resistance) | |
| Si・Al | Oxidation resistance | |
| S・Se | Machinability | |