STS321H – High-Carbon Titanium-Stabilized Steel: High-Temp Creep Resistant Alloy

Overview

STS321H is a high-carbon, titanium-stabilized austenitic stainless steel, engineered for high-temperature applications requiring exceptional creep strength and intergranular corrosion resistance. With a carbon content of 0.04-0.10% and 0.20-0.70% titanium, it combines high-temperature mechanical 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. This grade is suitable for continuous service at temperatures up to 850°C, making it ideal for high-temperature pressure vessels in Korean industrial sectors.

Chemical Composition (wt%)

C: 0.04-0.10, 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

High carbon content enhances high-temperature creep strength and mechanical stability; titanium stabilization prevents intergranular corrosion; excellent oxidation resistance at elevated temperatures (up to 850°C); non-magnetic; good weldability and formability; suitable for high-temperature pressure vessels.

Applications

High-temperature boilers, industrial heat exchangers, steam turbines, petrochemical reactors, nuclear power plant components, and high-temperature pressure vessels.

Equivalent Grades

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

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.