General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Stainless Grade 17-7 PH is a precipitation hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment. Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel. The alloy provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 800°F (427°C).
Standard Inventory Specifications
- UNS S17700
- AMS 5528
- ASTM A 693
- ASME SA 693
Common Trade Names
- 17-7 (® AK Steel)
- ATI 17-7 (™ Allegheny Technologies)
- T-17-7 Stainless Steel (ThyssenKrupp VDM)
Common Applications of 17-7 PH
- Aerospace applications
- Chemical processing equipment
- Oil and petroleum refining equipment
- Food grade stainless steel for processing equipment
- General metalworking
Chemical Composition
17-7PH Chemical Composition
Element
Percent by Weight
C
Carbon
0.09 maximum
Mn
Manganese
1.00 maximum
P
Phosphorus
0.05 maximum
S
Sulfur
0.03 maximum
Si
Silicon
1.00 maximum
Cr
Chromium
16.00 – 18.00
Ni
Nickel
6.75 – 7.75
Al
Aluminum
0.75 – 1.50
Physical Properties
17-7PH Physical Properties
Physical property | Value |
Density | 0.28 lb/in3 |
Melting Range | 2560 – 2625 °F |
Specific Heat Capacity at 70 – 212°F | 0.12 Btu/lb/°F |
Thermal Conductivity at 212°F | 117 Btu/hr-ft-°F |
Poisson’s Ratio | |
Elastic Modulus at 68°F | 28.5 x 106psi |
Mechanical Properties
17-7PH Mechanical Properties
- Please contact us for more details.
- The technical data provided is for information only and not for design< purposes. It is not warranted or guaranteed.
- For a deeper understanding of the difference between 17-4 PH and 17-7 PH precipitation hardening alloys.
- 17-7 PH Pipes
- 17-7 PH Fittings
- 17-7 PH Bars
- 17-7 PH Sheets & Plates
- 17-7 PH Coils & Strips
- 17-7 PH Wires

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