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

Description

Grade 321H represents the high-carbon evolution of 321, engineered to deliver enhanced high-temperature strength and creep resistance while retaining titanium stabilization benefits. With a carbon range of 0.04-0.10%, it provides improved mechanical stability at temperatures above 500°C, outperforming standard 321 in long-term thermal service. It maintains 321's titanium-stabilized corrosion resistance, preventing intergranular corrosion during welding and high-temperature exposure. Unlike 321, 321H is specifically formulated for high-pressure, high-temperature applications where structural integrity under sustained thermal stress 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 resistance; titanium-stabilized corrosion protection; enhanced mechanical strength at elevated temperatures; non-magnetic; suitable for high-pressure thermal components.

Applications

High-temperature boiler tubes, petrochemical pressure vessels, power generation equipment, heat exchangers, and industrial heating systems.

Equivalent Grades

UNS S32109, EN 1.4879, GB 07Cr18Ni10Ti, 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.