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AISI 321 Stainless Steel Foil
Available Configurations
Properties common to all products in this list
Key Features
AISI 321 Stainless Steel Foil (UNS S32100) is a titanium-stabilized austenitic stainless steel foil optimized for resistance to sensitization, intergranular corrosion, and oxidation at elevated temperatures:
Prevents Chromium Carbide Precipitation During Thermal Cycling & Welding
Titanium stabilization — minimum five times the carbon content — prevents chromium carbide precipitation during thermal cycling and welding, giving AISI 321 Foil reliable service life in continuously or cyclically heated assemblies.
Reliable Service Life Where Standard Austenitic Grades Would Be Vulnerable
AISI 321 Foil delivers reliable service life in assemblies where standard austenitic grades would be vulnerable to intergranular attack, particularly under sustained or cyclic thermal exposure.
Flexibility & Surface Quality in Thin Precision-Rolled Form
In thin precision-rolled form, AISI 321 Foil offers the flexibility and surface quality needed for thermal management systems and precision instrumentation diaphragms and gaskets.
Suited to Chemical Process Equipment Linings
Chemical process equipment linings benefit from AISI 321 Foil's resistance to sensitization and intergranular corrosion at the elevated temperatures common in chemical processing.
Resistance to Oxidation at Elevated Temperatures
Optimized resistance to oxidation at elevated temperatures supports reliable performance of AISI 321 Foil in flexible thermal shields exposed to sustained high-temperature operation.
Industrial Applications
AISI 321 Stainless Steel Foil is used across thermal management, chemical processing, and precision instrumentation sectors wherever standard austenitic grades would be vulnerable to intergranular attack:
- ✦ Flexible Thermal Shields
- Used as flexible thermal shields, where titanium stabilization prevents chromium carbide precipitation during thermal cycling, ensuring reliable performance under repeated heating and cooling.
- ✦ Chemical-Resistant Formed Gaskets
- Formed into chemical-resistant gaskets, where resistance to sensitization and intergranular corrosion supports long-term sealing performance in chemical process equipment linings.
- ✦ Precision Diaphragms in Sensors for Elevated-Temperature Service
- Used in precision diaphragms for sensors operating in elevated-temperature service, where the foil's flexibility and surface quality in thin precision-rolled form support consistent, repeatable sensor performance.
- ✦ Thermal Management Systems & Process Equipment Linings
- Applied in thermal management systems and chemical process equipment linings, where reliable service life under thermal cycling and welding distinguishes AISI 321 from standard austenitic grades.
- ✦ Fatigue & Creep Resistance Testing Under Thermal Cycling
- Used in fatigue and creep resistance testing under thermal cycling, microfabrication substrate development, and surface engineering studies.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 160-190 |
| Elongation at break( % ) | <60 |
| Modulus of elasticity( GPa ) | 190-210 |
| Izod impact strength( J m⁻¹ ) | 20-136 |
| Tensile strength( MPa ) | 560 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 70-73 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 800 |
| Melting point( C ) | 1400-1425 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 16.3@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 18@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.9 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |