630 plate stainless steel can be machined in both the solution annealed condition and the precipitation hardened condition. Because the final heat treatment temperature is low, 17-4PH can be machined to final dimension in the annealed condition and then aged without significant dimensional change or scaling unless the component is large, when allowance should be made for contraction on aging.
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 |
After solution treatment a single low temperature "age hardening" treatment is employed to achieve required properties, as below. This treatment results in no distortion and only superficial discolouration. A slight decrease in size (shrinkage) takes place during the hardening; this is approximately 0.05% for Condition H900 and 0.10% for H1150.
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