Industry Names: 17-4PH17-4 Stainless63017-4 Stainless Steel is a highly versatile and widely used precipitation-hardening alloy used in a number of aerospace, nuclear energy and chemical processing applications. One of the original “PH” (precipitation hardening) grades, 17-4 delivers a combination of oxidation and corrosion resistance along with a high strength, toughness and capability of achieving numerous quality mechanical properties through heat treating at various temperature ranges. 17-4 can be machined in the annealed condition and in the heat treated state. Maximum toughness is achieved by aging at 1150°F, while maximum strength is attained through aging at 900°F.
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| Property | Value |
| Electrical Resistivity | 463 Ohms (circ mil./ft.) |
| Melting Range | 2560-2625 °F |
| Poisson's Ratio | 0.272 |
| Density | 0.282 lb/inch³ |
| Element | Min | Max |
| C | - | .07 |
| Cb+Ta | 5xC | .45 |
| Cr | 15.0 | 17.5 |
| Cu | 3.0 | 4.0 |
| Fe | - | Bal |
| Mn | - | 1.0 |
| Mo | - | .05 |
| Ni | 3.0 | 5.0 |
| P | - | .07 |
| S | - | .03 |
| Si | - | 1.0 |