Complete specifications for 17-4 PH stainless steel, a precipitation hardening martensitic grade with copper. The preferred alloy for valve stems, shafts, and high-strength applications.
17-4 PH (UNS S17400) is a precipitation hardening martensitic stainless steel containing copper. In the solution treated and double aged condition, it has become the preferred alloy for stems and shafts and is used extensively in valve internals.
High strength, including good properties up to 315°C (600°F) and excellent corrosion resistance (comparable to 304 austenitic stainless in many environments) makes this alloy extremely versatile. NACE MR0175 permits specific aging cycles for sour service.
| Element | Min % | Max % |
|---|---|---|
| C | - | 0.07 |
| Si | - | 1.00 |
| Mn | - | 1.00 |
| P | - | 0.040 |
| S | - | 0.030 |
| Cr | 15.00 | 17.50 |
| Ni | 3.00 | 5.00 |
| Cu | 3.00 | 5.00 |
| Nb/Cb | 0.15 | 0.45 |
| Fe | Balance | Balance |
High strength with excellent corrosion resistance in many environments
Precipitation hardening provides high strength while maintaining corrosion resistance
Get competitive pricing on high-quality 17-4 PH with complete material certifications, heat treatment services, and precision machining capabilities.