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17-7PH Stainless Steel Coil
Available Configurations
Properties common to all products in this list
Key Features
17-7PH Stainless Steel Coil (UNS S17700) is a semi-austenitic precipitation-hardening stainless steel coil offering an outstanding balance of high tensile strength, good corrosion resistance, and spring-like fatigue performance:
High Tensile Strength After Aging (exceeding 1650 MPa)
The 17% chromium and 7% nickel composition, with aluminum as the precipitation-hardening element, enables tensile strengths exceeding 1650 MPa following appropriate conditioning and aging treatments — among the highest available in a precipitation-hardening stainless coil.
Annealed Ductility for Roll Forming & Spring Winding
The annealed strip retains sufficient ductility for roll forming, spring winding, and progressive-die stamping, allowing complex spring geometries to be formed before the final aging treatment locks in target strength.
Spring-Like Fatigue Performance
17-7PH delivers spring-like fatigue performance suited to precision springs in aircraft control systems and high-resilience formed components subjected to sustained cyclic loading.
Good Corrosion Resistance
Good corrosion resistance is retained alongside the alloy's exceptional strength, supporting reliable service in diaphragms used in petrochemical instrumentation and other moderately aggressive environments.
Consistent Properties Across Extended Coil Lengths
The coil format delivers consistent mechanical properties across extended lengths, supporting high-volume production of formed components where performance variation across the strip must be tightly controlled.
Industrial Applications
17-7PH Stainless Steel Coil is used across aerospace, petrochemical, and precision fastener sectors where the highest available precipitation-hardening strength must be combined with spring-like fatigue performance:
- ✦ Precision Springs in Aircraft Control Systems
- Formed into precision springs for aircraft control systems, where tensile strength exceeding 1650 MPa after aging and spring-like fatigue performance ensure reliable, long-life operation under the demanding cyclic loads of flight control mechanisms.
- ✦ Diaphragms in Petrochemical Instrumentation
- Used in diaphragms for petrochemical instrumentation, where good corrosion resistance combined with high mechanical strength supports accurate, reliable measurement performance in process environments.
- ✦ High-Resilience Formed Components in Aerospace Assemblies
- Formed into high-resilience components for aerospace assemblies, where the combination of high strength after aging and the annealed strip's forming ductility allows complex geometries to be produced before final heat treatment.
- ✦ Strip Stock for Precision Fastener Manufacture
- Supplied as strip stock for precision fastener manufacture, where consistent mechanical properties across the coil length ensure uniform fastener performance across high-volume production runs.
- ✦ Spring Element Prototyping & Heat Treatment Research
- Supports prototyping of fatigue-resistant spring elements and investigations into the relationship between heat treatment parameters and precipitation-hardening response, where coil format provides ample material for systematic experimental series.
Material Properties
| Element | Value |
|---|---|
| Elongation at break( % ) | <25 |
| Modulus of elasticity( GPa ) | 214 |
| Izod impact strength( J m⁻¹ ) | 61-115 |
| Tensile strength( MPa ) | 1020-1550 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 80-85 |
| Element | Value |
|---|---|
| Melting point( C ) | 1435 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 16.7@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 15.3@20-90°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.81 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Coil Width | <100mm | ±1mm |
| Coil Width | >=100mm | +2% / -1% |
| Length | +10% / -0% |