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15-7PH Stainless Steel Coil
Available Configurations
Properties common to all products in this list
Key Features
15-7PH Stainless Steel Coil (UNS S15700) is a semi-austenitic precipitation-hardening stainless steel supplied in continuous rolled coil form, combining high tensile strength, good corrosion resistance, and excellent fatigue performance for demanding aerospace and defense applications:
High Tensile Strength After Precipitation Hardening (exceeding 1500 MPa)
In the annealed condition 15-7PH retains sufficient ductility for forming, welding, and roll processing, and can subsequently be precipitation-hardened through controlled heat treatment to achieve tensile strengths exceeding 1500 MPa, providing strength levels well beyond conventional austenitic grades.
Semi-Austenitic Transformation to Martensite
The semi-austenitic structure transforms to martensite during conditioning, enabling exceptional strength levels while maintaining meaningful corrosion resistance — a combination not achievable in stable austenitic or standard martensitic alloy systems.
Excellent Fatigue Performance
15-7PH delivers excellent fatigue performance suited to precision springs and diaphragms subjected to repeated cyclic loading in aerospace actuators and high-reliability mechanical assemblies.
Good Corrosion Resistance
The chromium-nickel alloy system maintains good corrosion resistance even after precipitation hardening, supporting reliable service life in heat exchanger components and other corrosive-service applications.
Continuous Coil Format for Automated Processing
The coil format supports automated forming, stamping, and spring winding operations where consistent mechanical properties across extended strip lengths are an operational requirement, ensuring reproducible component performance across high-volume production runs.
Industrial Applications
15-7PH Stainless Steel Coil is used across aerospace, defense, and nuclear sectors where high tensile strength, fatigue resistance, and corrosion resistance must be combined in a continuous strip format:
- ✦ Precision Springs & Diaphragms for Aerospace Actuators
- Formed into precision springs and diaphragms for aerospace actuators, where tensile strength exceeding 1500 MPa after precipitation hardening and excellent fatigue performance ensure reliable operation under the repeated cyclic loading characteristic of actuator mechanisms.
- ✦ Heat Exchanger Components in Corrosive Service
- Used in heat exchanger components exposed to corrosive service environments, where good corrosion resistance combined with high mechanical strength supports long-term performance under combined thermal and chemical loading.
- ✦ Flexible Shielding Strips
- Applied as flexible shielding strips where the coil format enables continuous strip production and the alloy's strength-to-weight ratio supports lightweight shielding solutions in space-constrained assemblies.
- ✦ Formed Components in Nuclear & Defense Systems
- Formed into components for nuclear and defense systems, where consistent mechanical properties across extended strip lengths and the alloy's high strength after precipitation hardening meet the demanding reliability requirements of these sectors.
- ✦ Fatigue & Stress-Corrosion Research
- Provides a reproducible, specification-controlled substrate for fatigue testing, stress-corrosion cracking studies, and precipitation-hardening kinetics investigations, where consistent strip properties across the coil length support reproducible experimental results.
Material Properties
| Element | Value |
|---|---|
| Elongation at break( % ) | <30 |
| Tensile strength( MPa ) | 1020 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 80 |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.81 |
| Element | Value |
|---|---|
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 14.4@20-90°C |
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% |