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AISI 309 Stainless Steel Foil
Available Configurations
Properties common to all products in this list
Key Features
AISI 309 Stainless Steel Foil (UNS S30900) is a high-chromium, high-nickel austenitic stainless steel foil engineered for elevated-temperature service substantially beyond the capability of standard 18-8 grades:
Stable Oxide Scale Under Continuous & Cyclic Thermal Exposure
With 22-24% chromium and 12-15% nickel, AISI 309 forms a stable, adherent oxide scale under both continuous and cyclic thermal exposure, retaining meaningful mechanical strength at temperatures approaching 1000 °C.
Good Formability in the Annealed Condition (621 MPa Tensile Strength)
Room-temperature tensile strength of 621 MPa and elongation of 49% support good formability in the annealed condition, and the alloy is weldable by all common fusion processes.
Cold-Formable by Bending, Roll Forming & Drawing
Supplied in the annealed condition across standard thicknesses and cut sizes, AISI 309 Foil is cold-formable by bending, roll forming, and drawing, supporting flexible fabrication routes.
Retains Mechanical Strength Approaching 1000 °C
AISI 309 retains meaningful mechanical strength at temperatures approaching 1000 °C, substantially beyond the capability of standard 18-8 grades like 304 and 316.
Weldable by All Common Fusion Processes
Weldability by all common fusion processes supports fabrication of furnace linings and components exposed to hot acids, ammonia, and sulfur-bearing combustion gases.
Industrial Applications
AISI 309 Stainless Steel Foil is used across high-temperature industrial sectors where 304 and 316 grades would oxidize rapidly:
- ✦ Furnace Linings
- Used in furnace linings, where a stable, adherent oxide scale under both continuous and cyclic thermal exposure provides reliable thermal protection at temperatures where 304 and 316 grades would oxidize rapidly.
- ✦ Heat-Treatment Retorts
- Formed into heat-treatment retorts, where retained mechanical strength at temperatures approaching 1000 °C ensures dimensional integrity under sustained high-temperature operation.
- ✦ Radiant Tube Supports
- Used as radiant tube supports, where good formability in the annealed condition combined with elevated-temperature strength supports both fabrication and in-service durability.
- ✦ Components Exposed to Hot Acids, Ammonia & Sulfur-Bearing Combustion Gases
- Applied in components exposed to hot acids, ammonia, and sulfur-bearing combustion gases, where the stable oxide scale and weldability by all common fusion processes ensure reliable, durable performance.
- ✦ Oxidation Kinetics & Thermal Fatigue Research
- Provides a reproducible substrate for oxidation kinetics studies and thermal fatigue testing at intermediate-to-high service temperatures.
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 ) | 460-1100 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 70-72 |
| Element | Value |
|---|---|
| Melting point( C ) | 1400-1455 |
| 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 ) | 7.93 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |