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17-7PH Stainless Steel Disk
Available Configurations
Properties common to all products in this list
Key Features
17-7PH Stainless Steel Disk (UNS S17700) is a precision-cut circular component in a semi-austenitic precipitation-hardening stainless steel offering high tensile strength, excellent fatigue resistance, and good corrosion resistance:
High Tensile Strength After Hardening (above 1650 MPa)
The 17% chromium and 7% nickel composition with aluminum-based precipitation hardening allows tensile strength to be adjusted through heat treatment to suit specific load-bearing requirements, achieving values above 1650 MPa in the fully hardened condition.
Tailorable Strength to Suit Load Requirements
Tensile strength can be adjusted through heat treatment to suit specific load-bearing requirements, allowing the disk's mechanical properties to be matched precisely to the demands of individual aerospace or precision mechanical applications.
Excellent Fatigue Resistance
Excellent fatigue resistance under cyclic loading suits 17-7PH Disk to spring diaphragms and precision mechanical assemblies where both fatigue life and environmental resistance are critical.
Good Corrosion Resistance
Good corrosion resistance is retained alongside the alloy's high strength, supporting reliable performance in aerospace actuator components exposed to moderately aggressive service environments.
Dimensional Stability Under Cyclic Loading
In disk form, 17-7PH provides dimensional stability and reliable performance under cyclic loading, making it well suited to precision mechanical assemblies requiring consistent, repeatable geometric performance over extended service life.
Industrial Applications
17-7PH Stainless Steel Disk is used across aerospace and precision mechanical sectors where the highest available precipitation-hardening strength must be combined with fatigue life and environmental resistance in a precision circular form:
- ✦ Aerospace Actuator Components
- Used in aerospace actuator components where tensile strength above 1650 MPa in the fully hardened condition, combined with excellent fatigue resistance, ensures reliable performance under the repeated cyclic loading of actuator mechanisms.
- ✦ Spring Diaphragms
- Formed into spring diaphragms where tailorable tensile strength through heat treatment allows mechanical properties to be matched precisely to the load and deflection requirements of the diaphragm design.
- ✦ Precision Mechanical Assemblies
- Used in precision mechanical assemblies where both fatigue life and environmental resistance are critical, leveraging the disk's dimensional stability and reliable performance under sustained cyclic loading.
- ✦ Precipitation-Hardening & Fatigue Crack Growth Research
- Serves as test specimens for precipitation-hardening kinetics, fatigue crack growth studies, and surface treatment evaluations in high-strength stainless alloy systems, where the precision disk geometry supports reproducible experimental conditions.
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% |
| Diameter | ±0.5mm |