17-7PH ALLOYS UNS S17700 / AMS 5528 / DIN/EN 1.4568 / JIS SUS 632J1 / AISI 631

17-7PH ALLOYS, also known as UNS S17700, AMS 5528, DIN/EN 1.4568, JIS SUS 632J1, and >AISI 631 is a precipitation-hardened alloy renowned for its high tensile strength, excellent fatigue resistance, and robust corrosion resistance. It blends the characteristics of Type 301 and 302 stainless steels and is heat-treated to deliver superior mechanical performance.

This alloy maintains its strength and integrity at elevated temperatures of up to 600°F (316°C), making it ideal for aerospace components, petrochemical equipment, spring applications, and structural parts where durability and corrosion resistance are essential.

17-7PH demonstrates excellent dimensional stability during heat treatment and provides strong formability and weldability, especially when in the annealed state.

At Plus Metals, we provide 17-7PH stainless steel in various forms, including sheets, coils, bars, strips, and custom sizes. We ensure reliable delivery and material traceability for critical applications.

17-7PH Alloy Sheet | Plate

17-7PH Alloy sheets and plates are available in various thicknesses and sizes, suitable for applications requiring high strength and resistance to stress corrosion, including aerospace and automotive components.

17-7PH Alloy Round Bar | Rod

Round bars and rods in 17-7PH Alloy are available in different diameters and lengths, ideal for precision machining and manufacturing parts that need to withstand high stresses.

17-7PH Alloy Strip | Coil

Offered in strips and coils, 17-7PH Alloy is used for applications requiring flexible yet strong materials, such as in springs and other high-stress components.

17-7PH Alloy Applications

• 17-7PH Alloy is used for structural components and aerospace applications where high strength and resistance to corrosion are essential.

17-7PH Alloy Properties

• Tensile Strength: Exhibits high tensile strength, typically around 1,200 MPa, making it suitable for demanding applications.
• Density: Approximately 7.8 g/cm³, providing a good strength-to-weight ratio.
• Thermal Conductivity: Moderate thermal conductivity suitable for various applications.
• Corrosion Resistance: Excellent resistance to oxidation and corrosion, especially in environments with high humidity and corrosive chemicals.

Machining 17-7PH Alloy

• Cutting: Use high-speed steel or carbide tools for cutting. Precision cutting techniques such as laser or water jet cutting are recommended for detailed work.
• Drilling: Employ carbide drills for drilling 17-7PH Alloy. Proper cooling and lubrication are essential to prolong tool life and achieve accurate holes.
• Turning: Carbide inserts are preferred for turning. Maintain consistent cutting speeds and effective cooling to ensure optimal performance.
• Milling: Use carbide end mills with adequate cooling to manage heat and maintain precision during milling operations.
• Grinding: For grinding, use aluminum oxide or CBN wheels to achieve precise tolerances and a high-quality surface finish. Adequate cooling is necessary to prevent overheating and ensure dimensional accuracy.

Chemical Composition

• Aluminum (Al): Min 0.75%, Max 1.50%
• Manganese (Mn): Max 1.00%
• Phosphorus (P): Max 0.05%
• Silicon (Si): Max 1.00%
• Nickel (Ni): Min 6.75%, Max 7.75%
• Sulfur (S): Max 0.03%
• Carbon (C): Max 0.09%
• Chromium (Cr): Min 16.00%, Max 18.00%