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Phynox® Foil/Sheet
Available Configurations
Properties common to all products in this list
| Size |
|---|
| 10 x 10 mm 25 x 25 mm 50 x 50 mm 65 x 65 mm |
Need custom configurations? Please contact us.
Learn more about how Phynox® compares to similar cobalt-chromium alloys.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
Phynox® Foil/Sheet (Co 40/Cr 20/Fe 15/Ni 15/Mo 7/Mn 2) is a beryllium-free cobalt-chromium-nickel-molybdenum alloy flat sheet in the Half Hard temper, selected for flat spring elements, diaphragms, and precision-formed components where the combination of high fatigue strength, corrosion resistance in chloride-bearing environments, and non-magnetic character cannot be met by stainless steel:
Age-hardenable to tensile strength up to 2,000 MPa
The Half Hard condition provides a working balance of elevated strength and retained formability for flat drawing and precision blanking. After forming, age hardening at approximately 500 °C develops the alloy’s full mechanical potential, reaching tensile strength up to 2,000 MPa in the peak condition. This two-stage process (form first, harden second) is the standard processing route for complex flat spring geometries.
Superior pitting and crevice corrosion resistance from 7 % molybdenum
The 7 % molybdenum content stabilises the passive film against chloride-induced breakdown. This is confirmed to shift pitting potential to significantly more noble values versus lower-molybdenum cobalt alloys, and is the primary reason Phynox® is the preferred flat-form Co-Cr alloy for implantable and long-term marine or chemical service environments.
Non-magnetic character across all working temperatures
Relative permeability μr ≈ 1 is maintained across all working temperatures and in the fully hardened condition. This qualifies Phynox® Foil/Sheet for use in MRI-compatible assemblies and magnetically sensitive instrumentation where ferromagnetic spring materials would compromise system performance.
Beryllium-free composition for safe forming and processing
Unlike Elgiloy®, Phynox® contains no beryllium, eliminating the occupational health controls required during stamping, blanking, and EDM operations with beryllium-bearing alloys. This is a practical advantage in high-throughput production environments and simplifies regulatory compliance for implantable device manufacture.
Half Hard temper for flat drawing and precision blanking
The Half Hard temper is the standard supply condition for flat-form Phynox®, providing sufficient cold-work strengthening for structural spring behavior while retaining the formability needed for flat drawing and precision blanking to tight dimensional tolerances. It is the correct starting condition for diaphragm, flat spring, and stamped component manufacture.
Industrial Applications
Phynox® Foil/Sheet is specified where a flat-form spring or diaphragm material must combine high fatigue strength, chloride corrosion resistance, and non-magnetic character: a combination stainless steel grades cannot deliver simultaneously:
- ✦ Flat diaphragm springs in pressure transducers and force-measurement instruments
- Used as flat diaphragm spring stock in high-accuracy pressure transducers and sensitive force-measurement instruments, where the combination of high fatigue strength under cyclic loading, dimensional stability, and non-magnetic character ensures consistent sensor response and avoids drift induced by magnetic coupling to the instrument housing.
- ✦ Stamped surgical instrument and implantable device components
- Applied as precision-stamped components in surgical instruments and implantable medical devices, where the beryllium-free composition supports safe volume manufacture, the 7 % molybdenum content provides corrosion resistance to physiological chloride environments, and age hardening after forming delivers the mechanical strength required in service.
- ✦ Watch movement flat spring elements
- Used for flat spring elements in mechanical watch and precision chronometer movements, where the combination of high fatigue strength under sustained cyclic deflection, dimensional stability under varying temperature, and non-magnetic character for movement accuracy establishes Phynox® as the standard flat spring material in Swiss horology.
- ✦ Precision flat spring stock in high-cycle industrial and aerospace sensing assemblies
- Applied as flat spring stock in high-cycle force and displacement sensing assemblies in industrial automation and aerospace instrumentation, where resistance to fatigue failure over extended cycle counts, non-magnetic character for compatibility with adjacent sensor electronics, and corrosion resistance in humid or salt-spray environments are simultaneously required.
- ✦ Fatigue characterization, passive film studies, and biocompatibility investigations in research
- Used in research for systematic fatigue characterization of cobalt-chromium alloys in flat-form geometry, electrochemical passive film studies in simulated physiological and chloride media, and as a beryllium-free Co-Cr-Ni-Mo reference sheet material for biocompatibility and corrosion mechanism investigations.
Material Properties
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 95 |
| Element | Value |
|---|---|
| Melting point( C ) | 1450-1460 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 430@20°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 12.5@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 12.5@0-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.3 |
| Element | Value |
|---|---|
| Modulus of elasticity( GPa ) | 200 |
| Tensile strength( MPa ) | 800-2200 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |