Grade 321H Austenitic Stainless Steel – High-Carbon High-Temp Stabilized Alloy

Description

Grade 321H is the high-carbon variant of Grade 321, engineered to enhance high-temperature strength and creep resistance while retaining titanium stabilization. With a carbon range of 0.04-0.10%, it offers improved mechanical stability at elevated temperatures compared to standard 321, making it suitable for continuous service at 500-800°C. It contains the same titanium content (0.15-0.40%) as 321, ensuring resistance to intergranular corrosion and sensitization, even after welding. Unlike 321, 321H is optimized for high-temperature pressure components, providing superior creep strength and tensile strength at elevated temperatures, while maintaining non-magnetic properties and good weldability. It is widely used in power generation, petrochemical, and industrial heating applications where high-heat performance is critical.

Chemical Composition (wt%)

C: 0.04-0.10, 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

Superior high-temperature creep strength vs. 321; titanium-stabilized for intergranular corrosion resistance; good weldability; non-magnetic; excellent high-temperature stability; suitable for high-pressure, high-heat components.

Applications

High-temperature boiler tubes, heat exchangers, petrochemical pressure vessels, power generation equipment, and industrial heating components requiring high-heat strength.

Equivalent Grades

AISI 321H, UNS S32109, EN 1.4879, 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.