UNS S30409 Stainless Steel – High-Temperature Creep-Resistant 304 Variant

Product Overview

UNS S30409 is the high-carbon version of S30400, engineered exclusively for elevated-temperature service where mechanical stability and creep resistance are paramount. With a controlled carbon range of 0.04-0.10%, it delivers significantly improved tensile strength and creep resistance at temperatures above 500°C, outperforming both S30400 and S30403 in long-term thermal environments. This grade maintains the austenitic microstructure and general corrosion resistance of standard 304, remaining non-magnetic at room temperature. It is optimized for components subjected to sustained heat stress, balancing heat resistance with moderate corrosion protection for industrial heating and power applications.

Chemical Composition (Mass Fraction, %)

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, N ≤ 0.11

Mechanical Properties (Annealed Condition)

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

Core Advantages

Enhanced high-temperature creep strength; excellent oxidation resistance at elevated temperatures; stable mechanical performance under prolonged heat exposure; non-magnetic; good weldability; cost-effective for high-heat general applications.

Typical Applications

Boiler tubes, high-temperature piping, heat exchangers, furnace components, power generation equipment, and industrial heating systems operating at 500°C and above.

Equivalent Grades

AISI 304H, 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.