Fabrication17-4PH can be cold formed to a limited extent in the annealed condition. Severe cold working should be done in the H1150 condition to reduce the possibility of cracking. The steel should be re-aged after cold forming to restore the best combination of properties.
17-4PH is readily hot forged. During heat treatment or forging, protective atmospheres containing carbon or nitrogen should be avoided. These elements can be absorbed into the steel surface and give soft austenitic skin. If a protective atmosphere is required argon or helium is recommended.
Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Ni | Cu | Nb+Ta | |
630 | min. max | - 0.07 | - 1 | - 1 | - 0.04 | - 0.030 | 15 17.5 | 3 5 | 3 5 | 0.15 0.45 |
Heat at 1040°C for ½ hour and cool to 30°C maximum in air. Oil quenching may be used for small non-intricate sections.
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