17-4PH Stainless Steel Flat Bar
Stellanox Steel supplies high-performance 17-4PH Stainless Steel Flat Bars, known for their exceptional mechanical strength, hardness, and corrosion resistance. As a precipitation-hardened martensitic stainless steel, 17-4PH flat bars are used in demanding aerospace, marine, chemical, and high-pressure environments where strength, dimensional stability, and performance over time are crucial.
These flat bars are magnetic, easily machinable in solution-annealed condition, and customizable through heat treatment for strength levels up to 1300 MPa.
What is 17-4PH Stainless Steel Flat Bar?
17-4PH Stainless Steel Flat Bar is a rectangular solid bar made from a chromium-nickel-copper stainless steel alloy with niobium (columbium) for precipitation hardening. It can be age-hardened to various tempers (H900 to H1150), offering flexibility in mechanical performance. This grade combines strength, toughness, and corrosion resistance, making it ideal for precision components and heavy-duty structural use.
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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 Flat Bar
- Precipitation Hardenable: Achieves extremely high strength via aging treatments.
- High Yield & Tensile Strength: Suitable for load-bearing and fatigue-resistant parts.
- Excellent Corrosion Resistance: Performs well in both industrial and marine atmospheres.
- Dimensional Stability: Minimal distortion during machining and heat treatment.
- Magnetic in All Conditions: Ideal for high-precision magnetic applications.
- Customizable Properties: Available in H900, H1025, H1150 conditions.
Specification Chart – 17-4PH Stainless Steel Flat Bar
| Property | Details |
|---|---|
| Grade | 17-4PH (UNS S17400) |
| Standards | ASTM A564, AMS 5643, EN 10088-3 |
| Thickness Range | 6 mm – 50 mm |
| Width Range | 20 mm – 300 mm |
| Length | Up to 6 meters or custom cut |
| Finish | Bright, Peeled, Polished, Black |
| Condition | Solution Annealed, H900, H1025, H1150 |
Chemical Composition – 17-4PH Stainless Steel Flat 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 Flat 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 Flat Bar
| Standard | Grade |
|---|---|
| ASTM | 17-4PH |
| EN | 1.4542 |
| JIS | SUS 630 |
| UNS | S17400 |
| DIN | X5CrNiCuNb16-4 |
Applications of 17-4PH Stainless Steel Flat Bar
- Aerospace Brackets, Supports, and Shafts
- Marine and Offshore Load-Bearing Components
- Pump and Valve Bodies
- Nuclear Reactor Parts and Waste Containers
- High-Pressure Hydraulic Fittings
- Tooling, Molds, and Fixtures
Benefits of 17-4PH Stainless Steel Flat Bar
- Extremely high strength and hardness
- Magnetic and machinable
- Corrosion-resistant in industrial and marine conditions
- Minimal distortion during heat treatment
- Adaptable to various tempering conditions
- Ideal for structural, aerospace, and defense-grade systems
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
Can 17-4PH be hardened?
Yes. Through aging at specific temperatures (H900 to H1150), the bar can achieve various hardness and strength profiles.
Is 17-4PH stainless steel magnetic?
Yes, it is magnetic in all conditions—annealed or aged.
Is 17-4PH weldable?
Yes, it can be welded in the annealed condition, and post-weld aging is recommended to restore properties.
How does it compare to 304 or 316?
17-4PH offers significantly higher strength and hardness, while 304/316 have better corrosion resistance in highly acidic or chloride-rich environments.
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