17-4PH Stainless Steel Square Bar
Stellanox Steel supplies high-performance 17-4PH Stainless Steel Square Bars, engineered for strength-critical applications requiring exceptional mechanical properties, corrosion resistance, and heat treatment versatility. As a precipitation-hardening stainless steel, 17-4PH offers high tensile strength and hardness along with excellent corrosion resistance—making it ideal for aerospace, marine, defense, and petrochemical industries.
This square bar provides dimensional stability, wear resistance, and strength-to-weight advantages over many conventional stainless grades.
What is 17-4PH Stainless Steel Square Bar?
17-4PH Stainless Steel Square Bar is a solid square-shaped bar made from chromium-nickel-copper stainless steel stabilized with niobium (columbium). Through heat treatment, particularly precipitation hardening (aging), it achieves extremely high mechanical strength, making it suitable for dynamic, fatigue-prone, or load-bearing components.
Available in various tempers (H900 to H1150), 17-4PH bars allow for tailored strength and ductility combinations, depending on application requirements.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 17-4PH Stainless Steel Square Bar
- Precipitation Hardenable: Exceptional strength in H900-H1150 aging conditions
- High Yield and Tensile Strength: Maintains structural integrity under stress
- Corrosion Resistant: Similar to 304 in most environments, better in tough applications
- Magnetic: Magnetic in both annealed and aged conditions
- Machinable and Weldable: Good workability in solution-annealed state
- Stable Under Load: Excellent performance in critical precision parts
Specification Chart – 17-4PH Stainless Steel Square Bar
| Property | Details |
|---|---|
| Grade | 17-4PH (UNS S17400) |
| Standards | ASTM A564, AMS 5643, EN 10088-3 |
| Size Range | 6 mm – 100 mm |
| Length | Up to 6 meters or custom cut |
| Finish | Bright, Ground, Black, Peeled |
| Conditions | Solution Annealed, H900, H1025, H1150 |
Chemical Composition – 17-4PH Stainless Steel Square Bar
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 15.0 – 17.5 |
| Nickel (Ni) | 3.0 – 5.0 |
| Copper (Cu) | 3.0 – 5.0 |
| Niobium + Tantalum | 0.15 – 0.45 |
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties – 17-4PH Stainless Steel Square Bar (H900 Condition)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 1310 |
| Yield Strength (MPa) | ≥ 1170 |
| Elongation (%) | ≥ 10 |
| Hardness (HRC) | 40 – 47 |
| Density | 7.75 g/cm³ |
Equivalent Grades – 17-4PH Stainless Steel Square Bar
| Standard | Grade |
|---|---|
| ASTM | 17-4PH |
| EN | 1.4542 |
| JIS | SUS 630 |
| UNS | S17400 |
| DIN | X5CrNiCuNb16-4 |
Applications of 17-4PH Stainless Steel Square Bar
- Aerospace Frames and Engine Components
- Marine Shafts, Pumps, and Propeller Systems
- Nuclear Waste Containers
- Pressure Valves and Couplings
- Gears, Bearings, and Hydraulic Rods
- Tooling Fixtures and Jigs
Benefits of 17-4PH Stainless Steel Square Bar
- Combines high strength, corrosion resistance, and dimensional stability
- Magnetic and machinable in multiple heat-treated states
- Aging options allow flexibility in mechanical properties
- Great fatigue and wear resistance
- Ideal for high-load, cyclic stress, and aerospace-grade requirements
- Performs reliably in industrial, marine, and high-temperature environments
2025 Stellanox Steel |