If you are looking for high-strength, corrosion-resistant stainless steel wire for springs, fasteners, or precision engineering applications, GNEE 17-7 PH stainless steel wire is supplied in the cold-drawn C condition. After forming into springs, it should be heat-treated at 900°F for one hour to achieve the CH900 condition (cold-drawn and age-hardened), resulting in optimal tensile properties. The product is available in sizes ranging from 0.017 inches to 0.625 inches and conforms to ASTM A 313 and AMS-5678 standards.
What is 17-7PH Stainless Steel Wire?
17-7PH stainless steel wire is a precipitation-hardening (PH) alloy (specifically Grade 631) known for its high tensile strength, excellent fatigue properties, and good corrosion resistance. It is designed for demanding applications requiring high strength at temperatures up to 600°F (316°C), offering high elastic qualities similar to music wire, making it ideal for springs and wire forms.
Chemical Composition
| Element | Typical Range (%) |
|---|---|
| Carbon (C) | 0.05 max |
| Chromium (Cr) | 16.0 – 17.5 |
| Nickel (Ni) | 6.5 – 7.5 |
| Copper (Cu) | 3.0 – 5.0 |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Solution Treated | Precipitation Hardened |
| Tensile Strength | 930 – 1,100 MPa | 1,200 – 1,400 MPa |
| Yield Strength | 580 – 750 MPa | 1,000 – 1,200 MPa |
| Elongation (%) | 15 – 20 | 8 – 12 |
| Hardness (HRB / HRC) | 35 – 40 HRB | 38 – 45 HRC |
| Fatigue Strength | Good | Excellent |
Available Product Forms
| Product Type | Diameter Range | Length | Surface Finish | Supply Condition |
| Round Wire | 0.1 mm – 12 mm | Coiled or straight | Bright / Polished | Solution Treated / Precipitation Hardened |
| Flat Wire | Custom | Coiled | Polished | Precipitation Hardened |
| Strip / Ribbon | Custom | Coiled | Bright / Matte | Solution Treated |
Custom diameters and lengths can be supplied according to project requirements.
17-7 ph stainless steel spring wire Applications
Precision springs in aerospace and automotive
High-strength fasteners
Watch springs, micro-springs, and mechanical instruments
Electrical and medical device components
GNEE is a trusted supplier of precipitation-hardening stainless steel and specialty alloys in China. We supply 17-4 PH, 15-5 PH, and 17-7 PH alloys in various forms, including bars, plates, profiles, and forgings. All products are sourced from certified steel mills and undergo rigorous chemical composition and mechanical property testing to ensure reliable quality.
Whether you are in the aerospace, oil and gas, marine engineering, or defense industry, we ensure that every batch of our products meets international standards and your specific application requirements.
FAQ
Q.How strong is 17-7PH stainless steel wire?
Precipitation hardened 17-7PH wire from Gnee can reach a tensile strength of up to 1,400 MPa, making it ideal for high-performance springs and fasteners.
Q.Can 17-7PH wire be used in corrosive environments?
Yes. With 16–17% chromium and nickel content, it provides good corrosion resistance in mild acidic or chloride-containing environments.
Q.What is the difference between solution treated and precipitation hardened wire?
Solution treated wire is softer, easier to form or machine, while precipitation hardened wire achieves maximum strength and hardness after aging heat treatment.
Q.What standards does 17-7PH wire comply with?
Gnee's 17-7PH wire meets ASTM A313, AMS 5643, AMS 5737, and other international aerospace and industrial specifications.
Q.Can custom diameters and lengths be supplied?
Yes. We offer custom wire sizes, coiled lengths, or straightened wire according to your project specifications.