1. Standard Designations

• UNS: S32750

• ASTM: A790/A790M (Seamless & Welded)

• ASTM: A928/A928M (EFW)

• EN: 1.4410

• JIS: SUS 329J4L

• GB/T: 022Cr25Ni7Mo4N

2. Chemical Composition (% by weight)

3. Mechanical Properties

4. Corrosion Resistance

• PREN Value: 40-45

• Chloride Stress Corrosion Cracking: Excellent resistance

• Pitting & Crevice Corrosion: Superior to 2205 and 317L

• General Corrosion: Excellent in most acidic and chloride environments

• Erosion Corrosion: Good resistance due to high strength

5. Physical Properties

6. Product Range & Specifications

7. Manufacturing Processes

• Seamless Pipe: Hot extruded, cold drawn

• Welded Pipe: EFW (Electric Fusion Welded), TIG Welded

8. Surface Finishes

• Annealed & Pickled: Standard solution annealed finish

• Mechanically Polished: For specific applications

• Bead Blasted: Uniform matte surface

9. Typical Applications

• Offshore and marine piping systems

• Oil and gas production piping

• Chemical process industry

• Pollution control equipment

• Pulp and paper industry

• Desalination plants

• Heat exchangers and condensers

Quality Assurance:

• Hydrostatic testing per ASTM standards

• Ultrasonic testing for seamless pipes

• Radiographic testing for welded pipes

• PMI (Positive Material Identification)

• Ferrite content testing (35-55%)

• Intergranular corrosion test per ASTM A262

Technical Notes:

• Approximately twice the yield strength of conventional austenitic stainless steels

• Proper heat treatment is crucial to maintain balanced duplex structure

• Welding requires careful control of heat input and use of matching filler metals

• Not recommended for service temperatures above 300°C due to embrittlement risk

• Excellent resistance to chloride-induced stress corrosion cracking

All pipes supplied with full certification and meet international quality standards for critical service applications.