STS321H – Titanium-Stabilized High-Carbon Austenitic Alloy For High-Temperature Creep Resistance

Overview

STS321H is a titanium-stabilized, high-carbon austenitic stainless steel, designed for high-temperature applications requiring excellent creep strength and intergranular corrosion resistance. With a carbon content of 0.04-0.10% and titanium addition (0.20-0.70%), it combines high-temperature strength with resistance to intergranular corrosion, as titanium forms carbides to prevent chromium depletion during welding and high-temperature service. It contains 17.00-19.00% chromium and 9.00-12.00% nickel to maintain a stable austenitic structure, is non-magnetic, and has good weldability. It is suitable for continuous service at temperatures up to 850°C, making it ideal for high-temperature pressure vessels and heat exchangers.

Chemical Composition (wt%)

C: 0.04-0.10, Cr: 17.00-19.00, Ni: 9.00-12.00, Ti: 0.20-0.70, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030

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 during welding and high-temperature service; high carbon content enhances high-temperature creep strength; excellent oxidation resistance at elevated temperatures (continuous service up to 850°C); non-magnetic; good weldability and formability; suitable for high-temperature pressure vessels and heat-resistant components.

Applications

High-temperature boilers, heat exchangers, steam pipelines, petrochemical reactors, and nuclear power plant components requiring high creep strength and intergranular corrosion resistance.

Equivalent Grades

EN 1.4878, UNS S32109, GB 07Cr18Ni10Ti, AISI 321H, SUS321H

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.