What Is 17-7ph Spring Wire？
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what is 17-7ph spring wire?
17-7PH spring wire is a high-strength, precipitation-hardening stainless steel (AISI 631) known for excellent fatigue life, good corrosion resistance, and formability, making it ideal for springs and aerospace parts needing high performance at elevated temperatures (up to 600°F/316°C). It's formed in a soft condition (C) and then age-hardened (CH900) to achieve its superior mechanical properties, offering a balance of stainless steel corrosion resistance with the strength of high-carbon steel.
What standards cover 17-7PH spring wire?
Common standards include:
ASTM A313 / A693 (depending on product form)
AMS 5528 / AMS 5529
UNS S17700
Always confirm the applicable standard based on wire size and application.
What type of stainless steel is 17-7PH spring wire?
17-7PH spring wire is a semi-austenitic precipitation-hardening stainless steel wire.Unlike austenitic spring wires (such as 302 or 304), 17-7PH achieves its high strength through conditioning and precipitation hardening, not just cold working.
High quality 17-7 PH cold-drawn stainless steel wire
| Alloy Name: | 17-7 PH Welding Wire |
|---|---|
| Uns Number: | S17700 |
| Size/diameter (inches): | 0.0300 - 0.1250 |
| Specification: | AMS 5824 |
| Temper: | As Drawn |
| Available Forms: | Spools Coils Cut lengths |
| Note For Non Stock Items: |
If you need a non-stock item, we custom manufacture wire in most diameters and lengths. |
17-7 PH spring Wire chemical composition
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Carbon (C) | – | 0.09 |
| Chromium (Cr) | 16.0 | 18.0 |
| Nickel (Ni) | 6.5 | 7.8 |
| Aluminum (Al) | 0.7 | 1.5 |
| Manganese (Mn) | – | 1.0 |
| Silicon (Si) | – | 1.0 |
| Phosphorus (P) | – | 0.04 |
| Sulfur (S) | – | 0.03 |
| Iron (Fe) | Balance | – |
17-7 PH stainless steel wire Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ (0.282 lb/in³) |
| Modulus of Elasticity at 20°C | 200 GPa (29 × 10⁶ psi) |
| Modulus of Rigidity | 75 GPa (11 × 10⁶ psi) |
| Electrical Resistivity at 20°C | 0.8 Ω·mm²/m (80 microhm-cm) |
| Thermal Conductivity at 20°C | 16 W/m·K (9.5 Btu·ft/hr·ft²·°F) |
| Coefficient of Thermal Expansion (20-100°C) | 15.5 × 10⁻⁶ /K (8.5 × 10⁻⁶ /°F) |
| Specific Heat Capacity at 20°C | 500 J/kg·K (0.12 Btu/lb·°F) |
| Magnetic Permeability (Annealed Condition) | 1.4-3.6 (Weakly Ferromagnetic) |
17-7 PH stainless steel wire Mechanical Properties
| Condition | Ultimate Tensile Strength, MPa (ksi) | 0.2% Yield Strength, MPa (ksi) | Elongation in 50mm (2″), % | Hardness |
|---|---|---|---|---|
| Annealed (Condition A) | 900-1100 (130) | 280 min (40) | 35 | B85 |
| TH1050 | 1345 (195) | 1205 (175) | 8 | C42 |
| RH950 | 1550 (225) | 1380 (200) | 7 | C47 |
| Cold Worked (Condition C) | 1620 (235) | 1517 (220) | 6 | C48 |
| CH900 | 1827 (265) | 1793 (260) | 2 | C49 |
How does 17-7PH spring wire compare to 302 or 304 spring wire?
Compared to 302/304 stainless steel spring wire, 17-7PH spring wire offers higher strength and elastic limit, better fatigue performance, and greater resistance to stress relaxation at high temperatures, allowing for smaller and lighter springs. Therefore, 17-7PH is more suitable for high-load and high-cycle spring applications.
What are typical applications of 17-7PH spring wire?
17-7PH spring wire is commonly used for:
Compression and extension springs
Torsion springs
Aerospace springs
Precision electronic springs
Valve and actuator springs
It is especially suitable where high strength, fatigue life, and dimensional stability are critical.
Gnee provides 17-7PH spring steel wire with fully traceable and verifiable quality data: We provide material certificates (MTC) compliant with EN 10204 3.1 standards and strict dimensional tolerances compliant with ASTM A313 / AMS 5678 standards. All products undergo dimensional inspection, tensile/hardness testing, and metallographic analysis to ensure consistent quality for every batch.
We supply the material in coil form, weighing up to 500 kg, or cut to the required length, using export packaging suitable for sea freight (anti-rust paper, sealed plastic bags, wooden pallets or cartons with steel strapping), and accompanied by a certificate of origin and MTC EN 10204 3.1. We guarantee safe transportation via land or sea logistics, with cargo insurance purchased. Delivery time is 7-15 business days, depending on the destination, and real-time tracking is provided to ensure the product remains intact until delivery.
