17-4PH is a chromium-nickel-copper precipitation-hardening martensitic stainless steel offering an exceptional combination of high strength (up to 200 ksi tensile), good corrosion resistance, and simple heat treatment. Supplied in solution-treated Condition A, it can be strengthened through a single low-temperature aging treatment that minimizes distortion and scaling. With service capability up to 316-427°C (600-800°F), this alloy is widely used in aerospace, oil & gas, nuclear, and chemical processing industries for critical components requiring high strength and moderate corrosion resistance .
1. Product Specifications & Physical DataZYTC Alloy supplies 17-4PH in comprehensive mill forms for diverse industrial applications requiring verified mechanical properties and complete material traceability. Available Forms: Bar (round, flat, hexagon, square), wire, forgings, tube, ring, pipe, plate, sheet, and strip . Specifications: AMS 5604, AMS 5622, ASTM A564, UNS S17400, ASME SA564 .
| Chemical Composition (Weight %) | 17-4PH Specification |
|---|
| Chromium (Cr) | 15.0 - 17.5 | | Nickel (Ni) | 3.0 - 5.0 | | Copper (Cu) | 3.0 - 5.0 | | Niobium + Tantalum (Nb+Ta) | 0.15 - 0.45 | | Carbon (C) | 0.07 max. | | Manganese (Mn) | 1.0 max. | | Silicon (Si) | 1.0 max. | | Phosphorus (P) | 0.040 max. | | Sulfur (S) | 0.030 max. | | Iron (Fe) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.75 - 7.8 g/cm³ | 0.280 - 0.282 lb/in³ | | Modulus of Elasticity | 190 - 210 GPa | 27.6 - 30.5 × 10⁶ psi | | Poisson's Ratio | 0.27 - 0.30 | 0.27 - 0.30 | | Shear Modulus | 77.4 GPa | 11,200 ksi | | Thermal Conductivity (RT) | 17.9 W/m·K | 124 BTU·in/hr·ft²·°F |
| Mechanical Properties (Minimum) | Condition | Metric | Imperial |
|---|
| Tensile Strength | H900 | 1310 MPa | 190 ksi | | Yield Strength (0.2% offset) | H900 | 1170 MPa | 170 ksi | | Elongation | H900 | 10% | 10% | | Reduction of Area | H900 | 35% | 35% | | Tensile Strength | H925 | 1240 MPa | 180 ksi | | Yield Strength | H925 | 1138 MPa | 165 ksi | | Tensile Strength | H1025 | 1069 MPa | 155 ksi | | Yield Strength | H1025 | 1000 MPa | 145 ksi | | Tensile Strength | H1075 | 1000 MPa | 145 ksi | | Yield Strength | H1075 | 862 MPa | 125 ksi | | Tensile Strength | H1100 | 965 MPa | 140 ksi | | Yield Strength | H1100 | 758 MPa | 110 ksi | | Tensile Strength | H1150 | 862 MPa | 125 ksi | | Yield Strength | H1150 | 586 MPa | 85 ksi | | Hardness (H900) | | 40 HRC | 40 HRC |
2. Fabrication & Material ComparisonHeat Treatment: Solution Treatment (Condition A): 1038°C (1900°F) × 30 min, rapid cool to below 16°C (60°F) Aging (H900-H1150): 482-621°C (900-1150°F) × 1-4 hours, air cool H1150M: 760°C (1400°F) × 2h + 620°C (1150°F) × 4h
Forming: Suitable for mild forming in solution-treated condition; high yield strength requires powerful equipment . Machining: Good machinability in Condition A; produces long, gummy chips requiring sharp tools . Welding: Good weldability using GTAW/TIG and GMAW/MIG; oxyacetylene not recommended; post-weld solution + aging required for optimal properties . Hot Working: Forge at 1177°C (2150°F) starting temperature, finish at 1010°C (1850°F); post-work solution treatment required . Cold Working: Can be cold worked with adequate power and lubrication . Material Comparison: vs. 15-5 PH: Similar properties; 15-5 offers better transverse toughness . vs. 13-8 Mo: Lower strength but better cost-effectiveness; wider availability . vs. 304 Stainless: Significantly higher strength; similar corrosion resistance . vs. 410 Stainless: Superior corrosion resistance and strength; easier heat treatment .
3. ApplicationsAerospace: Aircraft landing gear, engine mounts, fasteners, turbine blades, structural components Oil & Gas: Valve stems, wellhead components, pump shafts, downhole tools, Christmas trees Nuclear: Reactor internals, control rod mechanisms, fasteners Chemical Processing: Shafts, fittings, gears, valve bodies Pulp & Paper: Equipment for steam and mild chemical environments General Engineering: High-strength fasteners, shafts, gears, molds
Contact ZYTC Alloy for certified 17-4PH materials with complete traceability, AMS/ASTM specifications, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
