Grade 304H Austenitic Stainless Steel – High-Temperature Strength Optimized

Description

Grade 304H is the high-carbon variant of Grade 304, tailored for elevated-temperature applications that demand enhanced creep resistance and mechanical stability. With a carbon range of 0.04-0.10%, it outperforms standard 304 and 304L in long-term service at temperatures above 500°C, where lower-carbon grades may experience gradual strength degradation. It maintains the same austenitic structure and general corrosion resistance as 304, remaining non-magnetic at room temperature, while offering improved high-temperature tensile and creep strength. Unlike 304 and 304L, 304H is specifically engineered for high-heat environments, making it a staple in power generation, boiler, and industrial heating applications where components must withstand sustained thermal stress without compromising integrity.

Chemical Composition (wt%)

C: 0.04-0.10, Cr: 18.00-20.00, Ni: 8.00-11.00, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030

Mechanical Properties

Tensile Strength ≥ 520 MPa, Yield Strength ≥ 205 MPa, Elongation ≥ 40%, Hardness ≤ 200 HB

Advantages

Superior high-temperature creep resistance vs. 304/304L; excellent oxidation resistance at elevated temperatures; non-magnetic; good weldability; stable mechanical performance at 500°C+; suitable for high-temperature pressure components.

Applications

Boiler tubes, high-temperature piping, heat exchangers, furnace components, power generation equipment, and industrial heating systems requiring long-term high-heat stability.

Equivalent Grades

AISI 304H, UNS S30409, EN 1.4306, GB 07Cr19Ni10, SUS304H

 

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.