309S Stainless Steel: High-Chromium-Nickel Alloy For High-Temperature Corrosion Resistance

Overview: 309S is a fully austenitic stainless steel with high chromium and nickel content, optimized for high-temperature corrosion resistance and creep properties. It is designed for continuous service in high-heat, oxidizing environments, outperforming standard 304/316 grades at elevated temperatures.

Chemical Composition (wt%): Chromium (Cr): 22.0-24.0; Nickel (Ni): 12.0-15.0; Carbon (C): ≤0.08; Manganese (Mn): ≤2.00; Silicon (Si): ≤1.00; Phosphorus (P): ≤0.045; Sulfur (S): ≤0.030; Iron (Fe): Balance.

Typical Mechanical Properties (Annealed Condition): Tensile Strength: ≥515 MPa; Yield Strength: ≥205 MPa; Elongation: ≥40%; Hardness (Brinell): ≤201 HB.

Core Advantages: Excellent high-temperature oxidation resistance (continuous service up to 1000°C); good creep resistance at elevated temperatures; superior corrosion resistance in sulfur-containing atmospheres; good weldability and formability.

Applications: High-temperature furnaces, boiler components, heat exchangers, industrial furnace linings, radiant tubes, and equipment exposed to high temperatures and oxidation.

Equivalent Grades: UNS S30908; EN 1.4833; JIS SUS309S; GB/T 06Cr23Ni13.

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.