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AISI 309S Stainless Steel Foil/Sheet
Available Configurations
Properties common to all products in this list
Key Features
AISI 309S Stainless Steel Foil (UNS S30908) is a low-carbon variant of AISI 309, sharing the 22-24% chromium and 12-15% nickel composition but with carbon restricted to 0.08 wt% maximum to minimize sensitization risk in welded and thermally cycled assemblies:
Minimized Sensitization Risk in Welded & Thermally Cycled Assemblies
Carbon restricted to 0.08 wt% maximum minimizes sensitization risk in welded and thermally cycled assemblies, preserving intergranular corrosion resistance in the heat-affected zone.
Preferred Choice Over Standard 309 for Post-Fabrication Welding
This modification makes 309S the preferred choice over standard 309 wherever the component requires post-fabrication welding or will experience temperatures in the sensitization range during service.
Significantly Better Weld Integrity Than Standard 309
AISI 309S delivers a room-temperature tensile strength of approximately 620 MPa and retains meaningful structural integrity beyond 900 °C, performing similarly to 309 in most elevated-temperature service conditions while offering significantly better weld integrity.
Fully Weldable by GTAW/TIG, GMAW/MIG, SMAW & SAW
Fully weldable by GTAW/TIG, GMAW/MIG, SMAW, and SAW processes, AISI 309S supports flexible fabrication routes for furnace mesh and heat-treatment baskets.
Meaningful Structural Integrity Beyond 900 °C
Meaningful structural integrity beyond 900 °C supports reliable performance of AISI 309S Foil in components exposed to hot acid and sulfur-bearing environments.
Industrial Applications
AISI 309S Stainless Steel Foil is used across furnace, heat-treatment, and high-temperature processing sectors wherever the component requires post-fabrication welding:
- ✦ Furnace Mesh
- Used in furnace mesh, where significantly better weld integrity than standard 309 ensures reliable long-term performance in welded high-temperature assemblies.
- ✦ Heat-Treatment Baskets
- Formed into heat-treatment baskets, where meaningful structural integrity beyond 900 °C combined with full weldability by GTAW/TIG, GMAW/MIG, SMAW, and SAW processes supports demanding fabrication and service requirements.
- ✦ Radiant Tube Supports
- Used as radiant tube supports, where minimized sensitization risk in welded and thermally cycled assemblies ensures intergranular corrosion resistance is preserved in the heat-affected zone.
- ✦ Components in Hot Acid & Sulfur-Bearing Environments
- Applied in components in hot acid and sulfur-bearing environments, where AISI 309S performs similarly to standard 309 in elevated-temperature service while offering superior weld integrity.
- ✦ High-Temperature Oxidation, Sensitization Kinetics & Creep Research
- Provides a metallurgically stable substrate for high-temperature oxidation, sensitization kinetics, and creep studies where weld integrity is an experimental variable.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | ≤217 |
| Elongation at break( % ) | 45 |
| Modulus of elasticity( GPa ) | 200 |
| Tensile strength( MPa ) | 670 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 78 |
| Element | Value |
|---|---|
| Melting point( C ) | 1400-1455 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 15.6@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 15.6@23°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.03 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |