Stainless Steel 17-4PH Round Bar (UNS S17400 / Type 630)
Stainless Steel 17-4PH Round Bar is a high-performance precipitation-hardening martensitic stainless steel that offers an excellent combination of high strength, good corrosion resistance, and superior mechanical properties. This grade is widely used in critical applications where both strength and reliability are essential.
Key Key Features
- High strength and hardness after heat treatment
- Excellent corrosion resistance (comparable to 304 in many environments)
- Good toughness in both base metal and welded conditions
- Excellent machinability in solution-annealed condition
- Suitable for applications requiring high reliability and durability
Applications
- Aerospace components
- Oil & gas and petrochemical equipment
- Chemical processing industries
- Food processing equipment
- Fasteners, shafts, and structural components
- Nuclear and engineering applications
Chemical Composition (Typical Range)
- Chromium (Cr): 15.00 – 17.50%
- Nickel (Ni): 3.00 – 5.00%
- Copper (Cu): 3.00 – 5.00%
- Carbon (C): ≤ 0.07%
- Manganese (Mn): ≤ 1.00%
- Silicon (Si): ≤ 1.00%
- Phosphorus (P): ≤ 0.04%
- Sulfur (S): ≤ 0.03%
- Columbium + Tantalum (Cb+Ta): 0.15 – 0.45%
Mechanical Properties
17-4PH stainless steel can achieve a wide range of mechanical properties through heat treatment. It provides:
- High tensile and yield strength
- Good elongation and toughness
- Excellent stress corrosion resistance in hardened conditions
Corrosion Resistance
17-4PH offers excellent resistance to corrosion and performs well in a wide range of environments, including:
- Petrochemical and marine conditions
- Food and dairy processing industries
- General industrial exposure
Machining & Heat Treatment
This grade can be machined in both:
- Solution-annealed condition (Condition A)
- Precipitation-hardened conditions (H900, H1025, H1150, etc.)
Heat treatment enhances strength and hardness while maintaining dimensional stability.
Standards & Specifications
- ASTM A693, A564, A705 (Type 630)
- AMS 5604, 5643, 5825
- ASME SA693 / SA564
- UNS S17400
- ISO 15156 / NACE MR0175