Precipitation hardening stainless steels have moderate to good corrosion resistance in a range of environments. They have a better combination of strength and corrosion resistance than when compared with the heat treatable 400 series martensitic alloys. Corrosion resistance is similar to that found in grade 304 stainless steel.
| Condition | Hardening | Hardening | Type of Cooling | Hardness | |
| Temperature | Time | Brinell | Rockwell C | ||
| A | 1038°C | 1/2 | Oil/Air (to below 32°C) | 363 max. | 39 max. |
| H900 | 480°C | 1 | Air | 420 | 44 |
| H925 | 594°C | 4 | Air | 409 | 42 |
| H1025 | 55°C | 4 | Air | 352 | 38 |
| H1075 | 85°C | 4 | Air | 341 | 36 |
| H1100 | 595°C | 4 | Air | 332 | 35 |
17-4 (® AK Steel)
ATI 17-4 (™ Allegheny Technologies)
Type 630 stainless
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Tom ntej: Qib 17-4PH Phaj
