AMS 5678 specification covers a corrosion-resistant steel in the form of wire from 0.007 to 0.625 inch (0.18 to 15.88 mm) in nominal diameter, cold drawn to Condition C and capable of being precipitation heat treated to Condition CH900. 17-7PH is a semi-austenitic precipitation-hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment. As a trusted supplier of high-performance alloys, ZYTC Alloy stocks 17-7PH stainless steel bars, sheets, pipes, and wires, combining medium corrosion resistance with excellent mechanical properties for demanding applications.
Specifications – 17-7PH Wire| Specification | Description |
|---|
| AMS 5678 | Wire, cold drawn to Condition C | | AMS 5644 | Bars and forgings | | ASTM A313 | Spring wire | | ASTM A564 | Bar | | UNS S17700 | Unified numbering system | | DIN 1.4568 | German standard | | X7CrNiAl17-7 | EN designation | | AISI 631 | AISI designation |
Physical Data| Chemical Composition (Weight %) | 17-7PH Specification |
|---|
| Chromium (Cr) | 16.0 – 18.0 | | Nickel (Ni) | 6.5 – 7.75 | | Aluminum (Al) | 0.75 – 1.50 | | Carbon (C) | 0.09 max. | | Manganese (Mn) | 1.00 max. | | Silicon (Si) | 1.00 max. | | Iron (Fe) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.80 – 7.81 g/cm³ | 0.282 lb/in³ | | Modulus of Elasticity | 200 – 214 GPa | 29.0 × 10⁶ psi | | Melting Range | 1400 – 1440°C | 2550 – 2625°F |
Mechanical Properties by Condition | Condition | Tensile Strength | Yield Strength | Elongation | Hardness |
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| Condition A (Annealed) | 1035 MPa (150 ksi) max | 380 MPa (55 ksi) max | 20% min | 92 HRB max | | Condition C (Cold Drawn) | 1380 MPa (200 ksi) min | 1205 MPa (175 ksi) min | 1% min | 41 HRC min | | TH1050 (Heat Treated) | 1240 MPa (180 ksi) min | 1034 MPa (150 ksi) min | 4-6% | 38-46 HRC | | RH950 (Heat Treated) | 1450 MPa (210 ksi) min | 1310 MPa (190 ksi) min | 4-6% | 46 HRC | | CH900 (Cold Drawn + Aged) | 1655 MPa (240 ksi) min | 1586 MPa (230 ksi) min | 1% min | 46 HRC min |
ApplicationsFlat Springs: Ideal spring material for flat springs, spring washers, and retaining rings Musical Instruments: Perfect wire for musical instrument strings Aerospace: Compressor discs, aerospace fasteners, structural components, jet engine parts Industrial: Chemical processing equipment, heat exchangers, power boilers, superheater tubes
ZYTC Alloy is a leading AS9120B and ISO 9001 dual-certified supplier of high-performance stainless steels, nickel alloys, and superalloys, serving global aerospace, industrial, medical and automotive industries. Our Advantages: ✅ AS9120B and ISO 9001 certified – quality management guaranteed ✅ Full material traceability from melt to delivery ✅ EN 10204 3.1 / 3.2 inspection certificates available ✅ Competitive factory pricing with no middlemen ✅ Fast delivery from ex-stock inventory ✅ Technical support from experienced metallurgists
Contact ZYTC Alloy Today 📧 Email: daisy@zytcsteel.com
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