1. Standard Designations

• UNS: S31703

• ASTM: A312/A312M (Seamless & Welded)

• ASTM: A358/A358M (EFW)

• EN: 1.4438

• JIS: SUS 317L

• GB/T: 022Cr19Ni13Mo4

2. Chemical Composition (% by weight)

3. Mechanical Properties

4. Corrosion Resistance

• Pitting Resistance: Superior to 316L in chloride environments

• Crevice Corrosion: Excellent resistance

• Stress Corrosion Cracking: Good resistance

• PREN Value: 29-33

• General Corrosion: Excellent resistance to sulfuric acid and phosphoric acid

5. Physical Properties

6. Product Range & Specifications

7. Manufacturing Processes

• Seamless Pipe: Hot extruded, cold drawn

• Welded Pipe: ERW, EFW, TIG Welded

8. Surface Finishes

• Annealed & Pickled: Standard finish

• Mechanically Polished: 180G-600G

• Electropolished: For high purity applications

• Bead Blasted: Uniform matte finish

9. Typical Applications

• Chemical processing equipment

• Pulp and paper industry equipment

• Flue gas desulfurization systems

• Pharmaceutical processing pipes

• Marine and coastal applications

• Pollution control equipment

Quality Assurance:

• Hydrostatic testing per ASTM A312

• Eddy current or ultrasonic testing

• PMI (Positive Material Identification)

• Intergranular corrosion test per ASTM A262

• Full material traceability

Technical Notes:

• Superior corrosion resistance to 316L in aggressive environments

• Excellent weldability with low carbon content

• Suitable for high chloride concentration environments

• Good resistance to reducing chemicals

• Cost-effective alternative to more expensive nickel alloys

All pipes supplied with complete test certificates meeting international standards for chemical processing applications.