1. Standard Designations

• UNS: S31008

• ASTM: A312/A312M (Seamless & Welded)

• ASTM: A358/A358M (EFW)

• EN: 1.4845

• JIS: SUS 310S

• GB/T: 06Cr25Ni20

2. Chemical Composition (% by weight)

3. Mechanical Properties (Room Temperature)

4. High-Temperature Properties

• Maximum Service Temperature: 1150°C (Continuous), 1035°C (Intermittent)

• Oxidation Resistance: Excellent due to high chromium content

• Creep Strength: Good mechanical strength retention at elevated temperatures

• Thermal Stability: Resists scaling and oxidation under cyclic conditions

5. Physical Properties

6. Product Range & Specifications

7. Manufacturing Processes

• Seamless Pipe: Hot extruded, cold drawn

• Welded Pipe: ERW, EFW, Laser Welded

8. Surface Finishes

• Annealed & Pickled: Standard mill finish

• Mechanically Polished: 180G-600G for specific applications

• Bead Blasted: Uniform matte surface

• Special Coatings: High-temperature resistant coatings available

9. Typical Applications

• Furnace radiant tubes and components

• Heat treatment equipment and fixtures

• Kiln furniture and internal structures

• Thermal processing conveyor systems

• Refinery and chemical furnace tubes

• Heat exchanger tubes in aggressive environments

Quality Assurance:

• Hydrostatic testing per ASTM standards

• Ultrasonic testing for seamless pipes

• Eddy current testing for welded pipes

• PMI (Positive Material Identification)

• Complete material traceability

Technical Notes:

• Excellent oxidation resistance up to 1150°C

• Good resistance to sulfur-containing atmospheres

• Suitable for both oxidizing and reducing environments

• Maintains strength better than 304/316 grades at high temperatures

• Good weldability using matching filler metals

All pipes supplied with full certification and meet international quality standards for high-temperature service.