17-4PH Stainless Steel Round Bar
Stellanox Steel supplies premium 17-4PH Stainless Steel Round Bars, engineered for high strength, excellent corrosion resistance, and outstanding hardness after heat treatment. As a precipitation-hardening martensitic stainless steel, 17-4PH is ideal for aerospace, defense, petrochemical, and marine industries where mechanical strength and dimensional stability are crucial.
This grade offers a unique combination of toughness, corrosion resistance, and high strength in a single alloy—making it one of the most widely used stainless steels for critical components.
What is 17-4PH Stainless Steel Round Bar?
17-4PH Stainless Steel Round Bar (UNS S17400) is a chromium-nickel-copper alloy with additions of niobium (columbium) that enable it to undergo precipitation hardening. It offers excellent mechanical properties in both the annealed and aged (heat-treated) condition and maintains strength and corrosion resistance in various environments, including mildly corrosive atmospheres and marine settings.
Heat treatment through controlled aging (e.g., H900, H1025) allows for tailored mechanical performance in specific industrial applications.
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Stainless Steel |
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Duplex Stainless Steel |
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Titanium |
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Hastelloy |
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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 Round Bar
- Precipitation Hardening Capability: Achieves very high tensile and yield strength.
- Excellent Corrosion Resistance: Comparable to 304 stainless steel in many environments.
- Good Machinability and Weldability: Especially in the solution-annealed state.
- High Dimensional Stability: Ideal for precision components and tools.
- Magnetic: In both annealed and hardened conditions.
- Aged Conditions (H900 to H1150): Offer flexibility in strength, ductility, and hardness.
Specification Chart – 17-4PH Stainless Steel Round Bar
| Property | Details |
|---|---|
| Grade | 17-4PH (UNS S17400) |
| Standards | ASTM A564, AMS 5643, EN 10088-3 |
| Diameter Range | 6 mm to 250 mm |
| Length | Up to 6 meters or custom lengths |
| Finishes | Bright, Black, Peeled, Ground |
| Conditions | Solution Annealed, H900, H1025, H1150 |
Chemical Composition – 17-4PH Stainless Steel Round Bar
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 15.0 – 17.5 |
| Nickel (Ni) | 3.0 – 5.0 |
| Copper (Cu) | 3.0 – 5.0 |
| Columbium (Nb) + Tantalum (Ta) | 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 Round Bar (Typical 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 Round Bar
| Standard | Grade |
|---|---|
| ASTM | 17-4PH |
| EN | 1.4542 |
| JIS | SUS 630 |
| UNS | S17400 |
| DIN | X5CrNiCuNb16-4 |
Applications of 17-4PH Stainless Steel Round Bar
- Aircraft Structural Components
- High-Pressure Shafts and Fasteners
- Valves, Gears, and Bushings
- Marine Equipment and Propeller Shafts
- Nuclear Waste Containers
- Molds and Tooling Components
Benefits of 17-4PH Stainless Steel Round Bar
- Extremely high strength after aging
- Excellent corrosion resistance in most industrial atmospheres
- Magnetic and heat-treatable
- Machinable and weldable in solution-annealed condition
- Maintains tight tolerances after aging
- Used in aerospace, nuclear, and defense-grade applications
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