321 Austenitic Stainless Steel – Titanium-Stabilized Weldable High-Temp Alloy

Description

321 is a titanium-stabilized austenitic stainless steel, designed to eliminate intergranular corrosion and enhance high-temperature stability. It is similar to 304 in chromium-nickel content (17.0-19.0% Cr, 9.0-12.0% Ni), with the addition of 0.15-0.40% titanium- which binds with carbon to prevent chromium carbide precipitation during welding and high-temperature exposure. Unlike 304 and 304L, 321 offers superior intergranular corrosion resistance and creep strength at elevated temperatures (up to 800°C), making it suitable for high-heat welded components. It remains non-magnetic at room temperature, has good formability and weldability, and is widely used in applications where post-weld corrosion resistance and high-temperature performance are critical-such as aerospace, automotive, and industrial heating systems.

Chemical Composition (wt%)

C ≤ 0.08, Cr: 17.00-19.00, Ni: 9.00-12.00, Ti: 0.15-0.40, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030

Mechanical Properties

Tensile Strength ≥ 515 MPa, Yield Strength ≥ 205 MPa, Elongation ≥ 40%, Hardness ≤ 201 HB

Advantages

Titanium-stabilized to prevent sensitization; superior intergranular corrosion resistance vs. 304; good high-temperature creep strength; non-magnetic; excellent weldability and formability; suitable for high-heat welded components.

Applications

Aerospace components, automotive exhaust systems, heat exchangers, boiler parts, furnace components, and high-temperature welded structures.

Equivalent Grades

AISI 321, UNS S32100, EN 1.4878, GB 06Cr18Ni10Ti

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.