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High Hardness 17-7PH / S17700 Stainless Steel Bar Solid Solution SS Bars Hot Rolled and Forged Rod
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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
High Hardness 17-7PH / S17700 Stainless Steel Bar Solid Solution SS Bars Hot Rolled and Forged Rod
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 Hardness 17-7PH / S17700 Stainless Steel Bar – Solid Solution Treated, Hot Rolled & Forged Rod for Demanding Applications
Product Overview
Engineered for extreme performance, High Hardness 17-7PH (UNS S17700) Stainless Steel Bars combine exceptional strength, corrosion resistance, and thermal stability in a single precipitation-hardening alloy. Available in both hot rolled and forged forms, these solid solution–treated round bars are ideal for aerospace, defense, energy, and high-precision industrial applications where reliability under stress is non-negotiable.
Manufactured to ASTM A276, AMS 5528, and AMS 5667 specifications, our 17-7PH bars undergo controlled solid solution annealing (Condition A) as standard—ensuring optimal microstructure for subsequent aging treatments that deliver hardness levels up to 48 HRC and tensile strengths exceeding 1380 MPa (200 ksi).
Whether you require stock diameters or custom-forged geometries, our rods are precision-machined, fully traceable, and available in cut-to-length sizes to minimize waste and accelerate your production cycle.
Why 17-7PH? The Ultimate PH Stainless Steel
17-7PH (AISI 631, EN 1.4568, 07Cr17Ni7Al) is a semi-austenitic precipitation-hardening stainless steel. Unlike conventional martensitic grades, it leverages a unique heat treatment sequence to transform its structure from ductile austenite to high-strength martensite—followed by aluminum-driven precipitation hardening.
This dual-phase design enables:
- Superior fatigue resistance
- Excellent dimensional stability during aging
- Good formability in the annealed state
- Outstanding corrosion resistance—comparable to Type 304 in many environments
After proper aging (e.g., TH1050 or RH950), 17-7PH achieves mechanical properties unmatched by most stainless alloys—making it the material of choice for springs, fasteners, turbine blades, and structural components in aggressive service conditions.
Key Product Features
- ✅ High Hardness Capability: Up to 48 HRC after RH950 aging
- ✅ Dual Processing Routes: Hot rolled (for cost efficiency) or forged (for enhanced grain flow and integrity)
- ✅ Solid Solution Annealed (Condition A): Supplied in soft, machinable state ready for customer-specific aging
- ✅ Diameter Range: 10 mm – 400 mm (hot rolled); 50 mm – 600 mm (forged)
- ✅ Custom Lengths: From 200 mm to 6000 mm, with tight tolerance control
- ✅ Full Certification: Mill Test Reports (EN 10204 3.1/3.2), chemical & mechanical data included
- ✅ Surface Options: As-rolled, pickled, turned, or ground finish
Chemical Composition (UNS S17700 per ASTM A276)
| Element | Weight % |
|---|---|
| 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 critical—it forms Ni₃Al precipitates during aging, delivering peak hardness without compromising toughness.
Mechanical Properties by Heat Treatment Condition
| Condition | Process Summary | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|---|
| Condition A | 1040°C soln. treat, 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 |
Note: All bars are supplied in Condition A unless pre-aged per customer request.
Hot Rolled vs. Forged 17-7PH Bars – Comparison
| Feature | Hot Rolled Bar | Forged Rod |
|---|---|---|
| Grain Structure | Equiaxed, moderate alignment | Directional grain flow, refined |
| Density & Integrity | Good | Superior (reduced porosity, inclusions) |
| Size Range | Ø10 – 350 mm | Ø50 – 600 mm (custom shapes possible) |
| Mechanical Uniformity | Standard | Enhanced, especially in transverse direction |
| Best For | General high-strength parts, springs, shafts | Critical aerospace/defense components, high-cycle fatigue parts |
| Lead Time | Shorter (stock available) | Longer (requires open-die or closed-die forging) |
Typical Applications
- Aerospace: Jet engine compressor blades, thrust reversers, landing gear bushings
- Defense: Missile guidance housings, armor brackets, actuator rods
- Energy: Downhole tools, nuclear reactor internals, steam turbine diaphragms
- Industrial: High-performance springs, snap rings, precision gears, valve stems
- Medical: Reusable surgical instrument frames (non-implantable)
Ordering Guide
To ensure accurate fulfillment, please provide:
- Material: 17-7PH / UNS S17700
- Form: Hot rolled or forged
- Standard: ASTM A276, AMS 5528, AMS 5667, or custom spec
- Diameter: e.g., Ø80 mm
- Length: e.g., 3000 mm (custom cutting available)
- Heat Treatment: As-annealed (Condition A) or pre-aged (specify TH1050/RH950)
- Surface Finish: As-rolled, pickled, turned (+/-0.1 mm tolerance), or ground
- Certification: MTR, PMI, ultrasonic testing (UT) upon request
Quality Assurance & Compliance
- Produced in ISO 9001:2015 and AS9100 certified facilities
- Full heat number traceability from melt to delivery
- Optional non-destructive testing (NDT): Ultrasonic, MPI, or dye penetrant
- Compliant with REACH, RoHS, and conflict minerals regulations
Frequently Asked Questions (FAQ)
Q: Can I machine 17-7PH in the as-supplied condition?
A: Yes—Condition A offers excellent machinability (similar to 304 stainless). Final aging should be done after machining to avoid distortion.
A: Yes—Condition A offers excellent machinability (similar to 304 stainless). Final aging should be done after machining to avoid distortion.
Q: What’s the difference between TH1050 and RH950?
A: TH1050 uses air cooling after conditioning; RH950 includes sub-zero treatment (-73°C), yielding higher strength and hardness but slightly lower ductility.
A: TH1050 uses air cooling after conditioning; RH950 includes sub-zero treatment (-73°C), yielding higher strength and hardness but slightly lower ductility.
Q: Is forged 17-7PH worth the extra cost?
A: For mission-critical parts subject to high fatigue or impact loads—yes. Forging improves grain continuity and eliminates internal voids.
A: For mission-critical parts subject to high fatigue or impact loads—yes. Forging improves grain continuity and eliminates internal voids.
Q: Can you supply pre-aged bars?
A: Absolutely. We offer TH1050, RH950, and CH900 conditions for immediate use in assembly lines.
A: Absolutely. We offer TH1050, RH950, and CH900 conditions for immediate use in assembly lines.
Conclusion
The High Hardness 17-7PH / S17700 Stainless Steel Bar—whether hot rolled or forged—delivers an unmatched blend of strength, corrosion resistance, and thermal performance. Supplied in the solid solution–treated (Condition A) state, it provides maximum flexibility for downstream processing while ensuring consistent quality across every batch.
With global logistics support, technical metallurgy assistance, and rapid lead times, we empower engineers to push the boundaries of what’s possible in high-stress environments.
Request a quote today—customize your 17-7PH bar in diameter, length, finish, and heat treatment to match your exact application needs.
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