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High-Strength 17-7 PH Stainless Steel Round Bar – Precipitation Hardening for Aerospace & Spring Applications
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xProduct Details
| Products Name | 17-7PH 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
Products Specification
| Products Name | 17-7PH 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 |
High-Strength 17-7 PH Stainless Steel Round Bar – Precipitation Hardening for Aerospace & Spring Applications
Product Overview
Engineered for peak performance in the most demanding environments, High-Strength 17-7 PH (Precipitation Hardening) Stainless Steel Round Bars offer an exceptional balance of ultra-high strength, excellent corrosion resistance, and superior fatigue endurance. Supplied in diameters from 10 mm to 350 mm, these bars are manufactured to ASTM A276, AMS 5528, and AMS 5667 standards and are ideal for aerospace components, high-performance springs, fasteners, and other critical engineering applications.
As a semi-austenitic precipitation-hardening stainless steel (UNS S17700, AISI 631, EN 1.4568), 17-7 PH can be formed in a ductile annealed state and then heat-treated to achieve tensile strengths exceeding 1380 MPa (200 ksi) and hardness up to 48 HRC—outperforming many martensitic and even some nickel-based alloys in specific service conditions.
Available in both hot rolled and precision-ground finishes, with custom cut-to-length options, our 17-7 PH round bars ensure seamless integration into your manufacturing workflow while minimizing material waste and secondary processing.
Why Choose 17-7 PH for High-Stress Applications?
17-7 PH stands apart from conventional stainless steels due to its unique three-stage heat treatment process, which enables precise control over mechanical properties:
- Solid Solution Annealing (Condition A) – Soft, formable state for machining or cold working.
- Conditioning Treatment – Transforms retained austenite into martensite via thermal or cryogenic methods.
- Aging (Precipitation Hardening) – Aluminum-rich Ni₃Al precipitates form at 510–565°C, delivering maximum strength and hardness.
This controlled transformation gives 17-7 PH:
- Higher strength-to-density ratio than 300-series stainless steels
- Better fatigue resistance than 17-4 PH in spring applications
- Excellent dimensional stability during aging (minimal distortion)
- Good oxidation resistance up to 315°C (600°F) continuous service
Key Product Specifications
| Parameter | Details |
|---|---|
| Material Grade | 17-7 PH (UNS S17700, AISI 631, 07Cr17Ni7Al) |
| Standards | ASTM A276, AMS 5528 (Sheet/Bar), AMS 5667 (Forged Bar) |
| Form | Round Bar (Solid) |
| Diameter Range | 10 mm – 350 mm |
| Processing Method | Hot Rolled (standard); Precision Ground (optional) |
| Standard Lengths | 3 m, 4 m, 6 m |
| Custom Cutting | Yes – from 100 mm to 6000 mm, ±1 mm tolerance |
| As-Supplied Condition | Condition A (Solution Annealed, ~22 HRC) |
| Optional Aging | TH1050, RH950, CH900 (pre-aged on request) |
| Surface Finish | As-rolled (mill scale), pickled, turned, or ground |
| Certification | EN 10204 3.1/3.2 Mill Test Report (MTR), PMI available |
Mechanical Properties After Heat Treatment
| Heat Treatment Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC) | Typical Use |
|---|---|---|---|---|---|
| Condition A (Annealed) | ≥1035 | ≥345 | ≥20 | ≤22 | Machining, forming, welding |
| TH1050 | ≥1310 | ≥1170 | 1–5 | 38–44 | General aerospace parts, fasteners |
| RH950 | ≥1380 | ≥1240 | 1–4 | 44–48 | High-stress springs, landing gear, actuators |
| CH900 (Cold-worked + aged) | ≥1520 | ≥1450 | <2 | 48–50 | Ultra-high-strength micro-components |
Note: All bars are shipped in Condition A unless pre-aged per customer specification.
Ideal Applications by Industry
| Industry | Component Examples |
|---|---|
| Aerospace | Jet engine blades, compressor disks, thrust reversers, flap tracks, bellows |
| Defense | Missile housings, guidance system brackets, ordnance springs |
| Automotive (Performance) | Valve springs, suspension components, turbocharger parts |
| Industrial Machinery | Diaphragm springs, snap rings, retaining rings, high-cycle fatigue shafts |
| Energy | Downhole tools, nuclear instrumentation tubes, steam turbine parts |
| Medical Devices | Reusable surgical frames, orthopedic tooling (non-implantable) |
Particularly valued in spring design due to its ability to maintain load under repeated deflection without relaxation.
Chemical Composition (UNS S17700 per ASTM A276)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.09 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 6.50 – 7.75 |
| Aluminum (Al) | 0.75 – 1.50 |
| Iron (Fe) | Balance |
Aluminum is the key hardening agent—forming coherent Ni₃Al precipitates during aging that impede dislocation motion without embrittlement.
Advantages Over Competing Alloys
| Alloy | Max Tensile Strength (MPa) | Corrosion Resistance | Spring Performance | Machinability (Annealed) |
|---|---|---|---|---|
| 17-7 PH | 1380–1520 | Excellent (≈304) | ★★★★★ | Good |
| 17-4 PH | 1310 | Moderate | ★★★☆☆ | Fair |
| 304 Stainless | 515 | Excellent | ★★☆☆☆ | Excellent |
| 4140 Steel | 1000+ | Poor (requires coating) | ★★★☆☆ | Good |
17-7 PH uniquely bridges the gap between stainless corrosion resistance and ultra-high strength—without sacrificing fatigue life.
Ordering Information
To place an order or request a quote, please specify:
- Grade: 17-7 PH (UNS S17700)
- Standard: ASTM A276 / AMS 5528 / Custom
- Diameter: e.g., Ø25 mm
- Length: e.g., 1500 mm (custom cut available)
- Quantity: in kg or pieces
- Surface Finish: As-rolled, pickled, turned (+/-0.1 mm), or ground
- Heat Treatment: As-annealed (default) or pre-aged (TH1050/RH950/CH900)
- Certification Needs: MTR, chemical analysis, mechanical test report, UT inspection
Quality & Compliance
- Produced in ISO 9001 and AS9100 certified mills
- Full heat traceability from raw material to finished bar
- Optional non-destructive testing (NDT): Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI)
- Compliant with REACH, RoHS, and conflict minerals regulations
- Export-ready packaging with moisture barrier and steel strapping
Frequently Asked Questions (FAQ)
Q: Can 17-7 PH be welded?
A: Yes—in the annealed (Condition A) state using matching filler (e.g., ER630). Post-weld solution treatment and aging are required to restore properties.
A: Yes—in the annealed (Condition A) state using matching filler (e.g., ER630). Post-weld solution treatment and aging are required to restore properties.
Q: Why is 17-7 PH preferred for springs over music wire or 302HQ?
A: It offers higher operating temperatures, better corrosion resistance, and superior stress relaxation resistance—critical in aerospace and downhole tools.
A: It offers higher operating temperatures, better corrosion resistance, and superior stress relaxation resistance—critical in aerospace and downhole tools.
Q: What’s the lead time for custom-cut bars?
A: Stock sizes: 3–7 days. Custom diameters or pre-aged bars: 2–4 weeks.
A: Stock sizes: 3–7 days. Custom diameters or pre-aged bars: 2–4 weeks.
Q: Is cryogenic treatment necessary?
A: Only for RH950 condition. TH1050 achieves high strength without sub-zero steps—ideal for cost-sensitive applications.
A: Only for RH950 condition. TH1050 achieves high strength without sub-zero steps—ideal for cost-sensitive applications.
Conclusion
The High-Strength 17-7 PH Stainless Steel Round Bar is the material of choice when failure is not an option. Its unparalleled combination of strength, corrosion resistance, and fatigue performance—especially after precipitation hardening—makes it indispensable in aerospace structures, precision springs, and mission-critical industrial systems.
Backed by rigorous quality control, global logistics, and metallurgical support, our 17-7 PH bars empower engineers to design lighter, stronger, and more reliable components.
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