SUS321 – Titanium-Stabilized Austenitic Steel: High-Temp Intergranular Corrosion Resistor

Overview

SUS321 is a titanium-stabilized austenitic stainless steel, designed to maintain excellent intergranular corrosion resistance during high-temperature service and welding. By adding 0.20-0.70% titanium, it forms stable titanium carbides that prevent chromium depletion, ensuring corrosion resistance even when exposed to temperatures between 427-816°C. With 17.00-19.00% chromium and 9.00-12.00% nickel, it forms a stable austenitic structure, making it non-magnetic in the annealed state. This grade offers better ductility and stress fracture resistance than 304-series alloys, and is widely used in high-temperature applications where intergranular corrosion is a major concern.

Chemical Composition (wt%)

C ≤ 0.08, Si ≤ 1.00, Mn ≤ 2.00, P ≤ 0.045, S ≤ 0.030, Cr: 17.00-19.00, Ni: 9.00-12.00, Ti: 0.20-0.70

Typical Mechanical Properties (Annealed Condition)

Tensile Strength (Rm): ≥ 515 MPa; Yield Strength (Rp0.2): ≥ 205 MPa; Elongation (A): ≥ 40%; Brinell Hardness (HB): ≤ 201

Core Advantages

Titanium stabilization prevents intergranular corrosion in high-temperature service and welded joints; excellent high-temperature oxidation resistance (up to 816°C); non-magnetic; good weldability and formability; superior ductility compared to 304-series alloys.

Applications

High-temperature heat exchangers, steam pipelines, chemical reactors, aerospace components, and industrial equipment operating in high-temperature corrosive environments.

Equivalent Grades

UNS S32100, STS321, EN 1.4878, GB 06Cr18Ni10Ti, AISI 321

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.