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AISI 631 - 17-7PH

AISI 631 - 17-7PH

17-7PH is a precipitation-hardened stainless steel with high strength and good corrosion resistance. It is the most formable of all PH grades and features a unique blend of Chromium, Nickel, and Aluminum for superior strength and hardness. Ideal for applications requiring high performance, 17-7PH is perfect for aerospace and other applications.

Equivalent grades

• AISI 631
• 17-7PH
• W.Nr. 1.4568
• UNS S17700

Chemical Composition Reference


Physical Property Reference

• Density: 7.8 g/cm³

• Tensile Strength: 1275 MPa

• Yield Strength: 1030 MPa

• Elogation: 6%

• Modulus of Elasticity : 204 GPa

• Melting Point: 1400-1450 °C

Stock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Tick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize

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AISI 631 - 17-7PH

Essential details
17-7PH is a high strength, heat treatable stainless steel. Its excellent fatigue properties, good corrosion resistance, and minimum distortion upon heat treatment make it a valuable material for aerospace applications. It's also ideal for flat springs in temperatures up to 600°F (316°C).

Typical Applications:

- Variety of springs and washers

- Chemical processing equipment

- Heat exchangers

- Power boilers

- Superheater tubes

- Components used in high-strength/high-temperature conditions

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