Material datasheet · Semi-austenitic PH stainless
Stainless Steel 17-7PH
UNS S17700 · Condition A (annealed) for forming, aged TH1050 or RH950 for strength
Semi-austenitic PH stainless. Forms easily annealed, ages to high strength.
Chemical composition
Nominal % by weight.
| Element | % by wt |
|---|---|
| Fe | Bal. |
| Cr | 16.0–18.0 |
| Ni | 6.5–7.75 |
| Al | 0.75–1.5 |
Applicable specifications
AMS / ASTM / MIL.
- AMS 5528
- AMS 5529 (sheet)
- ASTM A693
TH1050: austenite conditioning (1400°F) + 1050°F age. RH950: refrigerated + 950°F age (higher strength).
Machining guidance
CNC parameters and tooling.
Coated carbide; rigid setup
Tougher to machine than 17-4. Best for stamped/formed parts that age-harden.
Stock & cost
Forms and Q1 2026 pricing.
- Passivate
- PVD
Typical applications
Where 17-7PH Stainless is the right pick.
- Stainless springs (Belleville, helical)
- Aerospace bellows
- Diaphragms
- Formed fittings
Alternative materials
Substitute or upgrade options.
- 17-4PH (higher Ni, easier machining)
- 15-7PH (formability)
- 302 spring (low cost)
True Precision Machining · Buellton, CA
Machine your part in 17-7PH Stainless.
5-axis CNC · ISO 9001 · AS9100 · ITAR · CMMC-compliant · DFARS-compliant supply chain. AS9102 FAI on aerospace.
Technically reviewed by the True Precision Machining engineering team · Last reviewed June 2026
Standards referenced: AMS 5528, AMS 5529 (sheet), ASTM A693
Keep exploring
Related tools & references
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Estimate part weight from 17-7PH Stainless stock.
Aerospace specs that call out this alloy.