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Duplex Stainless Steel Foil
Available Configurations
Properties common to all products in this list
Key Features
Duplex Stainless Steel Foil (UNS S31803 / S32205) is a dual-phase austenitic-ferritic stainless steel foil with a balanced microstructure of approximately equal proportions of austenite and ferrite, offering a combination of high mechanical strength, excellent corrosion resistance, and good weldability that conventional single-phase austenitic grades cannot match:
Yield Strength Approximately Twice That of Standard Austenitic Grades
Duplex Stainless Steel Foil has a typical 0.2% yield strength approximately twice that of standard austenitic grades, providing exceptional mechanical performance in thin section.
Superior Resistance to Chloride-Induced Stress Corrosion Cracking & Pitting
Superior resistance to chloride-induced stress corrosion cracking and pitting compared with AISI 316L makes this foil the material of choice wherever mechanical load and chloride corrosion occur together.
Balanced Austenitic-Ferritic Microstructure
The balanced microstructure of approximately equal proportions of austenite and ferrite delivers a combination of high mechanical strength, excellent corrosion resistance, and good weldability unmatched by single-phase austenitic grades.
Precise Fabrication in Thin Cross-Section
In foil form, the thin cross-section enables precise fabrication for heat exchanger plates, chemical reactor linings, and sealing gaskets for offshore oil and gas installations.
Good Weldability
Good weldability supports use of Duplex Stainless Steel Foil in flexible metallic membranes in fuel cell stacks and other fabricated assemblies requiring reliable joining.
Industrial Applications
Duplex Stainless Steel Foil is used across offshore, desalination, and energy sectors wherever mechanical load and chloride corrosion occur together:
- ✦ Heat Exchanger Plates
- Used in heat exchanger plates, where yield strength approximately twice that of standard austenitic grades combined with superior chloride corrosion resistance ensures reliable performance under combined mechanical and chemical stress.
- ✦ Chemical Reactor Linings
- Formed into chemical reactor linings, where the balanced austenitic-ferritic microstructure delivers high mechanical strength and excellent corrosion resistance unmatched by single-phase austenitic grades.
- ✦ Sealing Gaskets for Offshore Oil & Gas Installations
- Used as sealing gaskets for offshore oil and gas installations, where superior resistance to chloride-induced stress corrosion cracking and pitting compared with AISI 316L ensures long-term sealing reliability in marine environments.
- ✦ Thin Corrosion Barriers in Desalination Plants
- Applied as thin corrosion barriers in desalination plants, where the precise fabrication enabled by the thin cross-section combined with superior chloride resistance supports reliable long-term operation.
- ✦ Flexible Metallic Membranes in Fuel Cell Stacks
- Used in flexible metallic membranes in fuel cell stacks, where good weldability combined with high mechanical strength supports reliable, durable membrane performance.
- ✦ Phase Balance & Localised Corrosion Mechanism Research
- Used as a model system for studying phase balance effects on localised corrosion mechanisms and microstructural behavior in reduced-thickness sections.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 290 |
| Elongation at break( % ) | <25 |
| Modulus of elasticity( GPa ) | 200 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 80 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Melting point( C ) | 1440 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 500@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 19@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 13.7@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.8 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |