SUS304H Austenitic Stainless Steel – High-Temperature Strength-Optimized Alloy

Product Introduction

SUS304H is the high-carbon variant of SUS304, tailored for elevated-temperature applications that require excellent creep resistance and mechanical stability. With a controlled carbon range of 0.04-0.10%, it outperforms SUS304 and SUS304L in long-term service at temperatures above 500°C, where lower-carbon grades may experience strength degradation. This grade maintains the austenitic structure and general corrosion resistance of SUS304, remaining non-magnetic at room temperature, while offering improved high-temperature tensile strength and creep resistance. It is widely used in high-heat industrial applications where components must withstand sustained thermal stress.

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 (Annealed State)

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

Core Advantages

Superior high-temperature creep resistance compared to SUS304/SUS304L; excellent oxidation resistance at elevated temperatures; non-magnetic; good weldability; stable mechanical performance under long-term high-heat conditions; suitable for high-temperature pressure components.

Typical Applications

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

Equivalent Grades

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

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.