17-4PH stainless steel (UNS S17400), also known as stainless steel 630, is a precipitation-hardening martensitic stainless steel widely used for its excellent combination of high strength, hardness, and corrosion resistance.
What is 17-4PH Stainless Steel?
17-4PH is a chromium-nickel-copper precipitation-hardening stainless steel. It can achieve high mechanical strength through heat treatment while maintaining good corrosion resistance.
Chemical Composition
Typical chemical composition includes:
- Chromium (Cr): 15–17.5%
- Nickel (Ni): 3–5%
- Copper (Cu): 3–5%
- Niobium (Nb): 0.15–0.45%
Mechanical Properties
17-4PH stainless steel provides excellent mechanical performance:
- Tensile Strength: up to 1310 MPa (depending on heat treatment)
- Yield Strength: up to 1170 MPa
- Hardness: up to 40 HRC
Heat Treatment Conditions
17-4PH can be heat treated into different conditions:
H900
- Highest strength and hardness
- Lower toughness
H1025
- Balanced strength and toughness
H1150
- Lower strength but improved ductility and corrosion resistance
Key Properties
1. High Strength
17-4PH offers one of the highest strength levels among stainless steels.
2. Good Corrosion Resistance
Comparable to 304 stainless steel in many environments.
3. Excellent Machinability
Easier to machine compared to other high-strength alloys.
4. Heat Treatment Flexibility
Mechanical properties can be tailored through aging treatment.
Applications
17-4PH stainless steel is widely used in:
- Aerospace components
- Oil and gas equipment
- Pump shafts and valves
- Chemical processing equipment
- Mechanical and structural parts
17-4PH vs Other Stainless Steels
Compared to 316L stainless steel, 17-4PH offers significantly higher strength but slightly lower corrosion resistance.
Compared to duplex 2205, 17-4PH has higher hardness but lower resistance to stress corrosion cracking.
Available Forms
- Round bar
- Plate
- Forgings
- Pipe and fittings
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Compare with 17-4PH vs 316L
See also 17-4PH vs 2205
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Conclusion
17-4PH stainless steel is an ideal choice for applications requiring high strength, durability, and moderate corrosion resistance. Its flexibility in heat treatment makes it suitable for a wide range of industrial uses.
See also 17-4PH stainless steel guide