| Customization: | Available |
|---|---|
| Type: | Welded |
| Technique: | SAW |
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17-7 PH(631) is a precipitation-hardened stainless steel that is well suited for aerospace and other applications requiring high strength and good corrosion resistance and formability. Type 17-7 PH(631) is a Chromium-Nickel-Aluminum, austenitic stainless steel. It is the most formable of all PH grades and has the highest strength and hardness. It is less magnetic than other PH grades and offers minimal distortion upon heat treatment. This material maintains its valuable properties at temperatures up to 800°F (427° C).
The two main properties of precipitation-hardened stainless steels are high corrosion resistance and high strength. Stainless steel grade 17-7 PH(631) is a precipitation hardened stainless steel that possesses high strength and hardness, excellent fatigue properties, good formability, good corrosion resistance, and minimal distortion upon heat treatment. The properties of this alloy are well suited for aerospace applications.
Stainless steel grade 17-7 PH(631) is suitable for use in fresh water and industrial atmospheres, and mild chemical and oxidizing environments. It is recommended that 17-7 PH(631) should not be used in salt water or reducing environments.
| Element | 17-7PH |
| Carbon | 0.09 |
| Chromium | 16.0-18.0 |
| Nickel | 6.5-7.7 |
| Manganese | 1.00 |
| Silicon | 1.00 |
| Aluminum | 0.75-1.50 |
| Phosphorus | 0.040 |
| Sulfur | 0.030 |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
17-7 PH(631) |
S17700 |
1.4541
|
AMS 5528 AMS 5529 AMS 5644 |
ASTM A 693 | - | ||
| Property | 17-7PH ≤ 0.010 inch thick |
17-7PH > 0.010 inch thick |
| Yield Strength, min. (ksi) | 65 | 55 |
| Tensile Strength, min. (ksi) | 150 | 150 |
| Elongation, min. (%) | - | 20 |
| Hardness, max. (Rb) | - | 92 |
| Property | 17-7 PH |
| Density, lb/in3 | 0.282 |
| Modulus of Elasticity, psi | 29 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 8.5 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.5 |
| Specific Heat, Btu/lb ˚F | 0.11 |
| Electrical Resistivity, Microohm-in | 31.5 |
Stainless steel grade 17-7 PH(631) is primarily used for applications requiring corrosion resistance, good strength, and mechanical properties up to 427°C (800°F) in operation. It is also commonly used for intricate parts due to its low distortion in heat treatment.
Stainless steel grade 17-7 PH(631) finds uses in the following:
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