| Primary Phase Transformation Zone | Formation Temperature (˚C) | Detected Phase | Average Microhardness (HV) |
| γ-austenite 700˚C - 950˚C, | 700 - 950 | σ-phase | 664 - 674 |
| 700 - 950 | s + g2-phases | - | |
| 700 | s, iron nitrides and carbide phases | 1080 | |
| α-ferrite 350˚C - 500˚C, | 350 | ἀ | 298 |
| 350 - 500 | Aged ἀ | 372 |