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17-4PH Stainless Steel Round Bar High Strength Precipitation Hardening Grade for Aerospace & Industrial Use
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xProduct Details
| Products Name | 17-4PH Stainless Steel Bar | Diameter | 10 - 350mm |
|---|---|---|---|
| Length | 6m Or Cutting Any Length As Request | Surface | Black Or Polishing |
| Service | Cutting | Standard | ASTM DIN GB EN |
| Other Products | Round Bar, Square Bar, Flat Bar.etc | Technique | Hot Rolled |
Product Description
17-4PH Stainless Steel Round Bar High Strength Precipitation Hardening Grade for Aerospace & Industrial Use
Products Specification
| Products Name | 17-4PH Stainless Steel Round Bar |
| Grade |
303,303Cu,304,304L,309S,310S,310H,316L,316Ti,316H,317L,321,329,347,410,415,420, 430F,431,440A/B/C,2205,2507,904l,254SMO,253MA,CD4MCU,XM-19,17-4PH,15-5PH,17-7PH,660,C276,600,601,625,718,800,800H,825,926.etc |
| Products Diameter Range | φ3mm - φ350mm |
| Length | 6m/pcs or cutting any length as request |
| Surface | Pickling finishing, bright finishing |
| Standard | ASTM JIS,GB,DIN EN |
| Service | Cutting |
| Other Shape | Square , Flat, Hexagonal, Round.etc |
| Loading Port | Shanghai Port |
| MOQ | 50 kgs |
Overview
17-4PH stainless steel round bar is a premium-grade, martensitic precipitation-hardening (PH) alloy renowned for its exceptional combination of high strength, good corrosion resistance, and excellent mechanical properties. Designated as UNS S17400 and equivalent to Chinese grade 0Cr17Ni4Cu4Nb or Japanese standard SUS630, this material is widely specified in demanding sectors such as aerospace, defense, oil & gas, nuclear energy, medical devices, and high-performance industrial machinery.
Manufactured to stringent international standards—including ASTM A564, AMS 5604, EN 10088-3, and ISO 15510—17-4PH round bars offer engineers a versatile solution where both structural integrity and environmental durability are critical. Its unique chemistry enables tailored mechanical properties through controlled heat treatment, making it ideal for components requiring high yield strength without sacrificing fabricability.
Key Advantages
- High Strength-to-Weight Ratio: Achieves tensile strengths up to 1310 MPa (190 ksi) after aging at 480°C.
- Excellent Corrosion Resistance: Comparable to Type 304 stainless steel in many environments, including atmospheric exposure, mild acids, and salt spray.
- Good Machinability & Weldability: Can be readily machined in the solution-annealed condition and welded using standard techniques (post-weld aging often required).
- Heat Treatable for Performance Tuning: Mechanical properties can be precisely adjusted via aging temperature (480–620°C).
- Biocompatible & Non-Magnetic: Suitable for medical implants and sensitive electronic applications.
Chemical Composition (Typical, wt%)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 15.5 – 17.5 |
| Nickel (Ni) | 3.0 – 5.0 |
| Copper (Cu) | 3.0 – 5.0 |
| Niobium + Tantalum (Nb+Ta) | 0.15 – 0.45 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
Note: The addition of copper and niobium enables precipitation hardening through the formation of fine ε-Cu and NbC phases during aging.
Mechanical Properties After Aging Heat Treatment
The hallmark of 17-4PH is its tunable strength via aging. Below is a performance comparison across common aging temperatures:
| Aging Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| H900 (480°C / 1h) | ≥ 1310 | ≥ 1180 | ≥ 10 | ≥ 40 |
| H925 (550°C / 4h) | ≥ 1060 | ≥ 1000 | ≥ 12 | ≥ 35 |
| H1025 (580°C / 4h) | ≥ 1000 | ≥ 860 | ≥ 13 | ≥ 31 |
| H1150 (620°C / 4h) | ≥ 930 | ≥ 725 | ≥ 16 | ≥ 28 |
All conditions assume prior solution treatment at 1020–1060°C followed by rapid cooling (e.g., water quench or forced air).
Engineering Insight: For aerospace landing gear or turbine blades, H900 provides maximum strength. For nuclear valve stems or surgical tools where toughness and stress-corrosion resistance are prioritized, H1150 is preferred.
Available Dimensions & Surface Finishes
We supply 17-4PH stainless steel round bars in a comprehensive range of diameters and finishes to meet global project requirements:
| Diameter Range | Standard Lengths | Surface Finish Options |
|---|---|---|
| 6 mm – 300 mm (0.25" – 12") | 2m, 3m, 6m (custom lengths available) | Black hot-rolled, Peeled & Polished, Centerless Ground, Bright Drawn |
| Tolerances | Per ASTM A484 / ISO 286 (h9 to h11 achievable on ground bars) | — |
Custom sizes, precision grinding (±0.01 mm tolerance), and ultrasonic testing (UT) are available upon request for critical applications.
Heat Treatment Guidelines
To unlock the full potential of 17-4PH, proper thermal processing is essential:
-
Solution Annealing:
- Temperature: 1020–1060°C
- Cooling: Rapid quench (water or air) to retain martensitic structure.
- Resulting hardness: ≤ 38 HRC (machinable condition).
-
Aging (Precipitation Hardening):
- Typical cycles: 480°C to 620°C for 1–4 hours, followed by air cooling.
- No further quenching required—aging is performed directly from ambient or preheated state.
Caution: Avoid prolonged exposure between 350–450°C, where spinodal decomposition may cause embrittlement due to G-phase (Ni₁₆Si₇Mn₆) formation along grain boundaries.
Applications Across Industries
| Industry | Typical Components | Why 17-4PH? |
|---|---|---|
| Aerospace | Jet engine parts, helicopter rotor hubs, landing gear pins | High strength at elevated temps, fatigue resistance |
| Oil & Gas | Downhole tools, wellhead valves, subsea connectors | Resists chloride stress corrosion cracking |
| Nuclear Energy | Reactor control rods, safety valve stems | Stability under radiation + moderate corrosion resistance |
| Medical | Surgical clamps, orthopedic implants, dental instruments | Biocompatibility, sterilizability, non-magnetic |
| Industrial | High-strength shafts, gears, pump axles, molds | Wear resistance + dimensional stability after aging |
Fabrication & Machining Tips
- Machining: Best performed in the solution-treated (soft) condition. Use carbide tools, low cutting speeds, and ample coolant to avoid work hardening.
- Welding: Preheat to 100–150°C if needed; post-weld aging restores strength in the heat-affected zone (HAZ).
- Forming: Limited cold formability due to martensitic structure—warm forming (>200°C) recommended for complex shapes.
- Surface Enhancement: Laser peening, nitriding (≤400°C), or shot peening can further improve fatigue life and surface hardness.
Quality Assurance & Certifications
Our 17-4PH round bars are produced under ISO 9001-certified systems and come with full mill test reports (MTRs) per EN 10204 3.1/3.2, including:
- Chemical analysis (OES verified)
- Mechanical test data (tensile, hardness, impact if required)
- Ultrasonic inspection (optional for aerospace grades)
- Traceability via heat number
Available certifications: NORSOK M-650 (for offshore), AMS-QQ-S-767, RoHS, REACH.
Why Choose Our 17-4PH Round Bars?
- Global Stock Network: Ready inventory in Asia, Europe, and North America for fast delivery.
- Precision Manufacturing: Advanced rolling and grinding lines ensure tight tolerances and consistent microstructure.
- Technical Support: In-house metallurgists assist with heat treatment parameters, failure analysis, and material selection.
- Sustainability Focus: Recycled content >60%; compliant with EU Green Deal initiatives.
Conclusion
17-4PH stainless steel round bar remains the gold standard for high-strength, corrosion-resistant components in extreme environments. Its unique ability to deliver aerospace-grade performance while maintaining reasonable cost and fabricability ensures its continued dominance across advanced engineering fields. Whether you're designing a Mars rover gearbox or a deep-sea hydraulic actuator, 17-4PH offers a proven, reliable material solution backed by decades of field validation.
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