1. Standard Designations

• UNS: S31008

• ASTM: A240/A240M

• EURONORM: 1.4845

• JIS: SUS 310S

• GB/T: 06Cr25Ni20 (Old designation: 0Cr25Ni20)

2. Chemical Composition (% by weight)

*Note: The low carbon content in 310S (compared to 310) minimizes carbide precipitation during prolonged high-temperature exposure, enhancing scale resistance and service life.*

3. Mechanical Properties (at Room Temperature, for Annealed Condition)

4. High-Temperature Properties

This is the key advantage of 310S.

• Maximum Continuous Service Temperature: Up to 1150°C (2100°F) in air.

• Oxidation Resistance: Excellent resistance to scaling and oxidation due to the high chromium content, which forms a stable, protective oxide layer.

• Creep Strength: Good strength and resistance to deformation under mechanical stress at high temperatures.

5. Physical Properties (Typical)

6. Corrosion Resistance

• High-Temperature Oxidation: Outstanding, this is its primary function.

• General Corrosion: Good resistance to many oxidizing acids and atmospheric corrosion at room temperature, superior to 304/304H.

• Sulfidation & Carburization: Offers better resistance than most other standard austenitic stainless steels, though not as good as specialized heat-resistant alloys.

7. Available Product Range (Plates)

8. Typical Applications

• Furnace Parts: Radiant tubes, muffles, retorts, and combustion chambers.

• Heat Treatment Equipment: Baskets, trays, and fixtures for annealing, carburizing, and hardening.

• Thermal Processing: Kiln components, heat exchanger tubing in aggressive environments.

• Power Generation: Boiler components, superheater tubes.