17-4PH is the most widely used precipitation-hardening stainless steel in MIM. The aging temperature after sintering determines the final balance of strength and ductility.
MIM 17-4PH — as-sintered vs aged conditions:| Condition | Aging Temp | Time | UTS (MPa) | Yield (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|---|---|
| As-sintered (no age) | N/A | N/A | 800-950 | 650-800 | 12-20 | 25-32 |
| H900 | 480°C | 1 hr | 1100-1300 | 1000-1200 | 8-14 | 38-44 |
| H925 | 495°C | 1 hr | 1050-1250 | 950-1150 | 10-16 | 36-42 |
| H1025 | 550°C | 4 hrs | 950-1100 | 800-950 | 14-20 | 32-38 |
| H1100 | 595°C | 4 hrs | 850-1000 | 700-850 | 16-22 | 28-34 |
| H1150 | 620°C | 4 hrs | 800-950 | 650-800 | 18-24 | 26-32 |
- H900: Maximum strength and hardness. Best for wear-resistant applications, latch mechanisms, thin-wall structural parts where strength is critical. Trade-off: lowest ductility
- H1025: Best all-around balance. 80% of the strength of H900 with 50-100% more ductility. Preferred for most automotive and industrial applications
- H1150: Over-aged condition. Used when dimensional stability after aging is critical (minimal distortion) or when some ductility is needed for post-aging forming or assembly
For most applications, H900 provides the highest strength (1200+ MPa UTS) and is the default for structural and wear parts. For applications requiring impact toughness or post-aging machining, H1025 offers better ductility with modest strength reduction. Specify the aging condition on your part drawing — "17-4PH per AMS 5643, H900 condition" is standard.
ATMIK regularly processes 17-4PH in H900, H1025, and H1150 conditions with documented property data per lot.