Grade 630 stainless steels are martensitic stainless steels that are precipitation hardened to achieve excellent mechanical properties. These steel achieve high strength and hardness following heat treatment. The heat and corrosion resistance of grade 630 are similar to that of grade 304 steels. This grades is also commonly referred to as grade 17-4PH.
| Element | % |
|---|---|
| Chromium | 15.00 – 17.50 |
| Nickel | 3.00 – 5.00 |
| Copper | 3.00 – 5.00 |
| Niobium + Tantalum | 0.14 – 0.45 |
Grade 630 martensitic precipitation hardening stainless steel has a combination of high hardness and strength after suitable heat treatment. It also has similar corrosion and heat resistance to Grade 304. The terms "Type 630" and "17-4PH" refer to the same grade.



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