17-4 stainless steel bar, also known as UNS S17400, 17-4 PH and Grade 630, is one of the original precipitation hardened grades developed in the 50’s. Primarily comprised of 17% chromium, 4% nickel, 4% copper, with the balance being iron. There are also trace amounts of manganese, phosphorus, sulfur, silicon, columbium (or niobium) and tantalum. Stainless Steel 17-4 PH delivers an excellent combination of oxidation and corrosion resistance. Other characteristics include high strength, toughness, and quality mechanical properties at temperatures up to 600° F. Engineers and designers frequently choose Stainless Steel 17-4 PH due to its high strength and superior corrosion resistance when compared to many other stainless steels


| C | MN | P | S | SI | CR | NI | MO | CU | OTHER | M/NM |
|---|---|---|---|---|---|---|---|---|---|---|
| .07 | 1. | .04 | .03 | 1. | 15. – 17.5 | 3. – 5. | 3. – 5. | Cb + Ta = .15 – .45 | M |
| UNS | TYPE | AMS | ASTM | FEDERAL | CHARACTERISTICS |
|---|---|---|---|---|---|
| S17400 | 17-4 PH | 5622 5643 | A-564 | – | Combines excellent corrosion resistance, high strength/hardness, low temperature hardening and good fabricating characteristics. |
Industries that use 17-4 PH include:
Aerospace
Chemical
Food processing
General metal working
Paper industries
Petrochemical
Petroleum
Products partially or completely constructed of 17-4 PH include:
Air spray guns
Bearings
Boat fittings
Castings
Dental components
Fasteners
Gears
Golf club heads
Hardware
Load cells
Molding dies
Nuclear waste casks
Precision rifle barrels
Pressure sensor diaphragm
Propeller shafts
Pump impeller shafts
Sailboat self steering systems
Springs
Turbine blades
Valves
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