310S – Ultra-High Alloy Austenitic Steel: Extreme High-Temperature Service Champion

Overview

310S is a low-carbon, ultra-high chromium-nickel austenitic stainless steel, renowned for its exceptional high-temperature oxidation and corrosion resistance. With 24.00-26.00% chromium and 19.00-22.00% nickel, it forms a stable protective oxide film that can withstand continuous service at temperatures up to 1050°C and short-term peaks up to 1100°C, even in harsh sulfur-containing or carburizing atmospheres. Its low carbon content (≤ 0.08%) improves weldability and minimizes carbide precipitation during welding, while its austenitic structure ensures non-magnetic properties and excellent ductility. This grade is the top choice for the most demanding high-temperature industrial applications.

Chemical Composition (wt%)

C ≤ 0.08, Si ≤ 1.00, Mn ≤ 2.00, P ≤ 0.045, S ≤ 0.030, Cr: 24.00-26.00, Ni: 19.00-22.00

Typical Mechanical Properties (Annealed Condition)

Tensile Strength (Rm): ≥ 515 MPa; Yield Strength (Rp0.2): ≥ 205 MPa; Elongation (A): ≥ 40%; Brinell Hardness (HB): ≤ 201

Core Advantages

Ultra-high chromium-nickel content provides superior high-temperature oxidation, carburization, and sulfidation resistance; low carbon content enhances weldability; non-magnetic; excellent ductility and formability; stable performance at extreme high temperatures (up to 1050°C continuous service).

Applications

High-temperature furnace linings, boiler superheater tubes, petrochemical cracking furnaces, incinerators, aerospace engine components, and extreme thermal processing equipment.

Equivalent Grades

UNS S31008, STS310S, SUS310S, EN 1.4845, GB 06Cr25Ni20

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.