ASTM A240 321 Heat Resistant Stainless Steel Foil
Material Grade；AISI 321 / UNS S32100 / EN 1.4541 / SUS321
Manufacturing Process； Bright Annealed (BA) or Solution Annealed
Thickness；0.03–0.50 mm
Width；10–1500 mm
Length；Coil Form or Cut-to-Length
Coil ID；300 mm, 400 mm, 508 mm, or Customized
Coil Weight；20–500 kg or Customized
Surface Finish；BA, 2B, No.4, Mirror, Matte
Surface Roughness BA: Ra ≤ 0.20 μm (Typical)
Thickness Tolerance ；±0.003 mm to ±0.010 mm
Width Tolerance；±0.10 mm
Edge Condition；Mill Edge (ME), Slit Edge (SE), Deburred Edge
Hardness；Soft Annealed, 1/4 Hard, 1/2 Hard, Full Hard
What is 321 Stainless Steel Foil?
321 stainless steel foil is a titanium-stabilized austenitic stainless steel rolled into ultra-thin sheets. It offers excellent heat resistance, capable of withstanding temperatures up to 2,000°F (1,093°C) while resisting intergranular corrosion and scaling during thermal cycling; consequently, it is widely used in aerospace and industrial manufacturing for applications such as heat shields and precision gaskets.
What Is the Maximum Service Temperature of SS 321 Foil?
The maximum continuous service temperature for SS 321 foil in air is 870°C (1600°F)For intermittent service, it can withstand temperatures up to 925°C (1700°F). Its titaniumstabilization allows it to resist intergranular corrosion in the 427--816°C (800--1500°F)range.
321 Stainless Steel Foil Supplier,Manufacturer
Our ASTM A240 321 heat-resistant stainless steel foil is a titanium-stabilized austenitic stainless steel alloy explicitly engineered for applications exposed to continuous or cyclic high-temperature environments. Compared to standard 304 stainless steel foil, the addition of titanium in Grade 321 effectively binds carbon to prevent chromium carbide precipitation during welding or prolonged exposure to the 427–816°C (800–1500°F) temperature range. This significantly enhances the material's resistance to intergranular corrosion while maintaining excellent oxidation resistance, creep strength, and long-term structural stability.
With a minimum tensile strength of 515 MPa, a minimum yield strength of 205 MPa, and an elongation of 40%, ASTM A240 321 foil is widely utilized in aerospace heat shields, automotive exhaust systems, bellows, expansion joints, heat exchangers, industrial furnaces, petrochemical equipment, and thermal insulation components.
GNEE supplies high-precision ASTM A240 321 heat-resistant stainless steel foil in thicknesses ranging from 0.02 mm to 3.0 mm. We offer customizable widths, temper conditions (annealed, 1/2 hard, full hard), and diverse surface finishes-including 2B, BA, No.4, Mirror, and Precision Bright Annealed-to fulfill the stringent requirements of electronics, aerospace, automotive, and industrial heating equipment manufacturers.
321 stainless steel foil specifications
| Item | Specification |
|---|---|
| Product Name | ASTM A240 321 Precision Stainless Steel Foil |
| Material Grade | AISI 321 / UNS S32100 / EN 1.4541 / SUS321 |
| Thickness | 0.03–0.50 mm |
| Width | 10–1500 mm |
| Length | Coil Form or Cut-to-Length |
| Coil ID | 300 mm, 400 mm, 508 mm, or Customized |
| Coil Weight | 20–500 kg or Customized |
| Surface Finish | BA, 2B, No.4, Mirror, Matte |
| Surface Roughness | BA: Ra ≤ 0.20 μm (Typical) |
| Thickness Tolerance | ±0.003 mm to ±0.010 mm |
| Width Tolerance | ±0.10 mm |
| Edge Condition | Mill Edge (ME), Slit Edge (SE), Deburred Edge |
| Hardness | Soft Annealed, 1/4 Hard, 1/2 Hard, Full Hard |
| Protective Film | PVC, PE, Laser Film, or Customized |
321 Stainless Steel Foil Chemical Compositions
| Grade | Standard | C | Si | Mn | P | S | Cr | Ni | Mo |
| 321 | ASTM A240 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.00-19.00 | 9.00-12.00 | – |
321 Stainless Steel Foil Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 520 | 205 | 40 | – | – |
Available Sizes
| Thickness (mm) | Width (mm) | Supply Form |
|---|---|---|
| 0.03–0.05 | 10–300 | Precision Coil |
| 0.05–0.10 | 10–600 | Coil / Strip |
| 0.10–0.20 | 20–1000 | Coil / Sheet |
| 0.20–0.50 | 50–1500 | Coil / Cut Sheet |
If you can provide the required thickness, coil width, and quantity, I can assist you in checking the price of 321 stainless steel foil, requesting custom slit thicknesses, or verifying stock availability.
What is 321 Stainless Steel Used For?
Aerospace and aircraft engine exhaust systems; automotive heat shields and trim components; high-temperature oven linings, boiler baffles, and wrapping materials for heat-treatment tooling; chemical processing equipment and expansion joints.
ASTM A240 321 Stainless Steel Foil price per kg
The price of ASTM A240 Type 321 stainless steel foil typically ranges from $6.00 to $18.00 per kilogram, though actual costs vary significantly based on thickness, order volume, and rolling processes. Custom or ultra-thin precision foils (under 0.1 mm thick) command higher prices; for small-batch orders of specialized specifications, the unit price can reach $25.00 to $45.00 per kilogram or even higher. We can provide 1–2 meter samples for testing; specific costs will be quoted separately. Contact GNEE today to meet your needs for 321 stainless steel foil!
Quality Control
Every batch of products is manufactured in strict accordance with ISO quality management procedures and undergoes comprehensive testing, including chemical composition analysis, PMI (Positive Material Identification), tensile testing, hardness testing, dimensional tolerance verification, surface roughness checks, and flatness measurements. We provide EN 10204 3.1 Material Test Certificates (MTC) as standard and can arrange inspections by SGS, BV, TUV, or other third-party agencies upon customer request.
High temperature resistant 321 foil packaging
Each coil is successively wrapped in protective PVC film, anti-rust paper, and moisture-proof PE film, and reinforced with edge protectors; the coils are then packed into fumigation-free wooden crates or export-grade plywood pallets. Steel strapping and shock-absorbing cushioning materials are used during packaging to prevent shifting during loading, unloading, and ocean transport.
FAQ
Is 321 Better Than 304 Stainless Steel?
321 is not universally "better" than 304, but it is the superior choice for high-temperature applications (up to 1,500°F) and environments prone to welding-induced corrosion. While 304 is ideal for general fabrication and food-safe environments, 321 contains titanium to prevent dangerous carbide precipitation.
What tempers (hardness) are available for 321 foil?
Annealed (Soft): Most common for deep drawing and forming.
1/2 Hard / Full Hard: Used for spring-like applications or high-strength shims.
Is 321 Stainless Steel Magnetic?
Type 321 stainless steel is predominantly non-magnetic in its annealed state. Because it belongs to the austenitic family of stainless steels, its specific crystal structure makes it non-magnetic.
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