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High-Strength 17-7 PH Stainless Steel Round Bar – Precipitation Hardening for

China High-Strength 17-7 PH Stainless Steel Round Bar – Precipitation Hardening for

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High-Strength 17-7 PH Stainless Steel Round Bar – Precipitation Hardening for

MOQ： 500 kgs
Price： 3-5 USD/Kg
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Payment Terms	T/T, Western Union
Supply Ability	50 Ton per Month
Delivery Time	5 - 10 days
Packaging Details	wooden box or water resistant paper surround
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
Brand Name	Delta
Model Number	17-7PH
Certification	ISO 9001
Place of Origin	China

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Product Details
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Product Specification


Payment Terms	T/T, Western Union	Supply Ability	50 Ton per Month
Delivery Time	5 - 10 days	Packaging Details	wooden box or water resistant paper surround
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
Brand Name	Delta	Model Number	17-7PH
Certification	ISO 9001	Place of Origin	China
High Light	17-7 PH stainless steel round bar ，precipitation hardening stainless steel bar ，aerospace grade stainless steel bar

High-Strength 17-7 PH Stainless Steel Round Bar – Precipitation Hardening for Aerospace & Spring Applications

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.

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.

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.

Q: Is cryogenic treatment necessary?
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.

17-7 PH stainless steel round bar, high-strength precipitation hardening stainless, UNS S17700 bar for aerospace, 17-7 PH spring steel, ASTM A276 17-7 PH, RH950 stainless bar, TH1050 condition bar, forged 17-7 PH rod, corrosion-resistant high-strength steel, 17-7 PH for jet engines, cut-to-length 17-7 PH bar, AMS 5528 stainless steel, high fatigue resistance stainless bar.

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Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...

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JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
No.283-1, Youyi Middle Road, Xishan District, Wuxi City, Jiangsu Province
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