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17-7 PH Stainless Steel Rod – Corrosion-Resistant, Heat-Treatable Alloy for Precision Engineering
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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 |
17-7 PH Stainless Steel Rod – Corrosion-Resistant, Heat-Treatable Alloy for Precision Engineering
Product Overview
The 17-7 PH (Precipitation Hardening) Stainless Steel Rod is a high-performance semi-austenitic alloy engineered for applications demanding an exceptional balance of strength, corrosion resistance, and dimensional stability. With the UNS designation S17700 (also known as AISI 631 or EN 1.4568), this versatile material is supplied in diameters ranging from 6 mm to 350 mm, available in both hot-rolled and precision-ground forms, and fully compliant with ASTM A276, AMS 5528, and AMS 5667 standards.
Ideal for aerospace, defense, medical instrumentation, spring manufacturing, and high-precision industrial components, 17-7 PH can be easily machined or formed in its annealed condition and then heat-treated to achieve ultimate tensile strengths exceeding 1380 MPa (200 ksi) and hardness up to 48 HRC—all while maintaining corrosion resistance comparable to Type 304 stainless steel.
Our rods are supplied in the solution-annealed (Condition A) state as standard, ready for your custom aging cycle, and can be cut to exact lengths to streamline production and reduce waste.
Why 17-7 PH Excels in Precision Engineering
Unlike conventional martensitic or austenitic stainless steels, 17-7 PH leverages a controlled phase transformation through a three-step thermal process:
- Solution Annealing (Condition A): Soft, ductile structure ideal for machining, cold forming, or welding.
- Conditioning Treatment: Converts retained austenite to martensite via thermal cycling or cryogenic exposure.
- Precipitation Hardening (Aging): Aluminum-rich Ni₃Al precipitates form at 510–565°C, delivering peak strength with minimal distortion.
This unique metallurgy enables:
- Near-net-shape stability during aging—critical for tight-tolerance parts
- Superior fatigue and stress-corrosion cracking resistance
- Excellent surface finish retention after final heat treatment
- High strength-to-weight ratio for weight-sensitive designs
Key Specifications
| Parameter | Details |
|---|---|
| Material Grade | 17-7 PH (UNS S17700, AISI 631, 07Cr17Ni7Al) |
| Standards | ASTM A276, AMS 5528 (Bar/Sheet), AMS 5667 (Forged Bar) |
| Form | Solid Round Rod / Bar |
| Diameter Range | 6 mm – 350 mm |
| Processing Options | Hot Rolled (standard), Centerless Ground, Peeled & Turned |
| Standard Lengths | 3 m, 4 m, 6 m |
| Custom Cutting | Yes – from 100 mm to 6000 mm (±0.5 mm tolerance on ground bars) |
| As-Supplied Condition | Condition A (Solution Annealed, ≤22 HRC) |
| Optional Conditions | TH1050, RH950, CH900 (pre-aged upon request) |
| Surface Finish | As-rolled, pickled, turned, or precision-ground (Ra ≤ 0.8 µm) |
| Certification | EN 10204 3.1/3.2 Mill Test Report (MTR), PMI, UT available |
Mechanical Properties by Heat Treatment Condition
| Condition | Process Summary | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|---|
| Condition A | 1040°C → air cool | ≥1035 | ≥345 | ≥20 | ≤22 |
| TH1050 | 1040°C → air cool → 565°C/4h age | ≥1310 | ≥1170 | 1–5 | 38–44 |
| RH950 | 1040°C → air cool → -73°C → 510°C/4h age | ≥1380 | ≥1240 | 1–4 | 44–48 |
| CH900 | Cold-worked + 510°C age | ≥1520 | ≥1450 | <2 | 48–50 |
Note: All mechanical values are typical minimums per AMS/ASTM specifications.
Chemical Composition (UNS S17700 – 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 precipitation-hardening element, enabling high strength without compromising toughness.
Precision Applications Across Industries
| Industry | Typical Components |
|---|---|
| Aerospace | Bellows, diaphragms, flap tracks, actuator rods, compressor blades |
| Defense & Missiles | Guidance housings, spring retainers, structural brackets |
| Medical Devices | Reusable surgical instrument frames, biopsy tool components |
| Automotive (Performance) | High-cycle valve springs, turbo actuator shafts |
| Industrial Automation | Precision springs, snap rings, sensor housings, micro-gears |
| Energy | Nuclear control rod drives, downhole sensor sleeves |
Particularly valued where tight tolerances, long fatigue life, and corrosive environments coexist.
Advantages Over Alternative Alloys
| Feature | 17-7 PH | 17-4 PH | 304 SS | 4140 Steel |
|---|---|---|---|---|
| Max Strength (MPa) | 1380–1520 | ~1310 | ~515 | ~1000 |
| Corrosion Resistance | Excellent | Moderate | Excellent | Poor (requires plating) |
| Dimensional Stability During Aging | ★★★★★ | ★★★☆☆ | N/A | N/A |
| Spring Performance | Outstanding | Good | Poor | Good (but corrodes) |
| Machinability (Annealed) | Good | Fair | Excellent | Good |
17-7 PH uniquely delivers aerospace-grade performance with stainless-level corrosion protection.
Ordering Guide
To ensure accurate fulfillment, please specify:
- Grade: 17-7 PH (UNS S17700)
- Standard: ASTM A276 / AMS 5528 / Custom spec
- Diameter: e.g., Ø12.7 mm (½") or Ø100 mm
- Length: e.g., 850 mm (custom cut available)
- Finish: As-rolled, turned (+/-0.1 mm), or ground (Ra ≤ 0.8 µm)
- Heat Treatment: Condition A (default) or pre-aged (TH1050/RH950/CH900)
- Certification: MTR, chemical analysis, ultrasonic testing (UT), or MPI
Quality Assurance
- Produced in ISO 9001:2015 and AS9100D certified facilities
- Full heat number traceability from melt to delivery
- Optional non-destructive testing: Ultrasonic (per AMS-STD), Magnetic Particle Inspection
- Compliant with REACH, RoHS, and conflict minerals regulations
- Export packaging: Waterproof wrapping, steel strapping, wooden crates for long bars
Frequently Asked Questions (FAQ)
Q: Can I machine 17-7 PH before aging?
A: Absolutely—and it’s recommended. Machine in Condition A for best results; final aging induces minimal distortion.
A: Absolutely—and it’s recommended. Machine in Condition A for best results; final aging induces minimal distortion.
Q: Is 17-7 PH magnetic?
A: Yes—after martensitic transformation (post-conditioning), it becomes ferromagnetic.
A: Yes—after martensitic transformation (post-conditioning), it becomes ferromagnetic.
Q: What’s the maximum service temperature?
A: Continuous use up to 315°C (600°F); short-term exposure to 480°C (900°F) is possible.
A: Continuous use up to 315°C (600°F); short-term exposure to 480°C (900°F) is possible.
Q: Do you supply small-diameter rods for springs?
A: Yes—down to 6 mm, with centerless grinding available for high-precision spring wire blanks.
A: Yes—down to 6 mm, with centerless grinding available for high-precision spring wire blanks.
Conclusion
The 17-7 PH Stainless Steel Rod is the intelligent choice for engineers who refuse to compromise between strength, corrosion resistance, and precision. Its heat-treatable nature allows for tailored mechanical properties, while its stable microstructure ensures reliability in the most demanding applications—from jet engines to life-saving medical tools.
Backed by global supply capabilities, technical metallurgy support, and rigorous quality systems, we deliver not just material—but confidence in performance.
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