321 Stainless steel coil is a titanium-stabilized austenitic chromium-nickel stainless steel. This alloy is renowned for its excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range. The addition of titanium, which is a strong carbide-forming element, enhances its suitability for use in high-temperature applications.

Key Features & Advantages

• Excellent High-Temperature Properties: 321 exhibits superior strength and oxidation resistance at elevated temperatures (up to 900°C / 1650°F for continuous service and up to 925°C / 1697°F for intermittent service).

• Intergranular Corrosion Resistance: The titanium addition minimizes the formation of chromium carbides at grain boundaries during welding and high-temperature exposure, preventing the depletion of chromium and thus maintaining corrosion resistance.

• Good General Corrosion Resistance: Inherits excellent corrosion resistance from its 18-8 chromium-nickel base, similar to Type 304, making it suitable for a wide range of mildly corrosive environments.

• Ease of Fabrication: Demonstrates good formability and weldability. It can be readily fabricated using common techniques.

Chemical Composition (Typical %)

**Ti content is typically at least 5 times the carbon content.*

Mechanical Properties (Annealed Condition)

Available Specifications (Examples)

• ASTM A240 (Plate, Sheet, and Strip)

• ASTM A182 (Forged Fittings)

• ASTM A312 (Seamless Pipe)

• AMS 5510, AMS 5511

• EN 1.4541

Common Applications
321 stainless steel coil is ideally suited for applications involving high temperatures and corrosive conditions, including:

• Aerospace: Engine exhaust systems, manifolds, afterburner parts.

• Automotive: Exhaust systems, flexible connectors, catalytic converter housings.

• Chemical Processing: Heat exchangers, expansion joints, furnace parts, refinery piping.

• Power Generation: Boiler shrouds, superheater tubes.

• Food Processing: Equipment requiring repeated welding and high-temperature sterilization.

• Welded Fabrications: Components that cannot be annealed after welding.

Available Forms & Dimensions

• Thickness: Available in a wide range, from thin gauge to several millimeters.

• Width: Custom slit to various widths as required.

• Coil ID/OD: Standard inner diameter (ID) and outer diameter (OD) or customized to customer needs.

• Surface Finish: Standard 2B, BA, No. 1, or other finishes as specified.