17-4PH Stainless Steel Plate
17-4Ph offers high strength and hardness along with excellent corrosion resistance.17-4 Ph has been used for a variety of applications including oil field valve parts, chemical process equipment, aircraft fittings, fasteners, pump shafts, nuclear reactor components, gears, paper mill equipment, missile fittings, and jet engine parts.
Available thicknesses for Alloy 17-4PH:
| 3/16" | 1/4" | 5/16" | 3/8" | 7/16" | 1/2" | 9/16" | 5/8" | 3/4" | 7/8" | 1" |
| 4.8mm | 6.3mm | 7.9mm | 9.5mm | 11.1mm | 12.7mm | 14.3mm | 15.9mm | 19mm | 22.2mm | 25.4mm |
| 1 1/8" | 1 1/4" | 1 1/2" | 1 3/4" | 2" | 2 1/4" | 2 1/2" | 2 3/4" | 3" | 3 1/2" | 4" |
| 28.6mm | 31.8mm | 38.1mm | 44.5mm | 50.8mm | 57.2mm | 63.5mm | 69.9mm | 76.2mm | 88.9mm | 101.6mm |
Alloy 17-4PH is a precipitation hardening martensitic stainless steel with Cu and Nb/Cb additions. The grade combines high strength, hardness (up to 572°F /300°C), and corrosion resistance. Mechanical properties can be optimized with heat treatment. Very high yield strength up to 1100-1300 MPa (160-190 ksi) can be achieved.
1. What is Alloy 17-4PH stainless steel?
Alloy 17-4PH (UNS S17400) is a precipitation hardening martensitic stainless steel containing chromium, nickel, copper, and niobium. It delivers a unique combination of high strength, hardness, and moderate corrosion resistance. It is commonly supplied in the solution-annealed condition (Condition A) and strengthened through heat treatment.
2. How does 17-4PH perform in corrosive environments?
Its corrosion resistance is similar to 304 stainless steel in most environments and significantly better than 400-series martensitic grades. However, it is not ideal for prolonged exposure to stagnant seawater or highly chlorinated environments. In chloride and H₂S environments, higher aging temperatures (preferably 1094°F / 590°C) are recommended.
3. Can Alloy 17-4PH be heat treated?
Yes. Alloy 17-4PH is supplied in the solution-annealed Condition A and can be further heat treated through age hardening to modify mechanical properties. Common treatments include:
• H900 – 900°F (482°C) for 4 hours, air cooled (highest strength)
• H1025, H1075, H1150 – higher aging temperatures with varying strength and toughness
• H1150M, H1150D – involve multi-step aging cycles
4. Can 17-4PH be cold or hot formed?
Cold forming is limited and should only be done in the annealed condition. Hot forming should be performed at 1742–2192°F (950–1200°C), followed by solution annealing and aging for final mechanical properties.
5. Is 17-4PH machinable?
Yes. It machines well in both solution-annealed and precipitation-hardened conditions. Carbide tooling is preferred. Dimensional allowances should be made for post-machining heat treatment if required.
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