Grade 630 stainless steels have good resistance to oxidation. However, long-time exposure of grade 630 to temperatures of 370 to 480°C should be avoided, to prevent loss of toughness at ambient temperature. These grades should not be used at temperatures above age-hardening temperature, to avoid reduction of hardness and mechanical properties of the metal.
| Grade | C | Si | Mn | P | S | Cr | Ni | Cu | Nb |
| 17-4PH | 0.07 | 1.00 | 1.00 | 0.040 | 0.030 | 15.00~17.50 | 3.00~5.00 | 3.00~5.00 | 0.15~0.45 |
It is known for its resistance to stress-corrosion cracking, and is used in a wide variety of industries and applications including:
Valves and gears
Oil field equipment
Propeller shafts
Pump shafts
Valve spindles
Aircraft and gas turbines
Nuclear reactors
Paper mills
Chemical processing equipment
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