In the annealed condition machining is only marginally different from 300 series austenitic stainless steels. In the H900 condition the machining rate is 60% of that for annealed material.
17-4PH has excellent weldability under production conditions, with procedures similar to 300 series stainless steels. All welding methods can be applied. 17-4PH does not require pre-heat up to 100mm section.
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 |
Typical mechanical properties achieved after solution treating and then age hardening at the indicated temperatures are as in the table in the following page. The Condition is designated by the age hardening temperature in °F (Condition A is solution treated, ie not aged).
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