TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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2205 super duplex stainless steel pipe
Electric-fusion-welded Steel Pipe for corrosive service.
Grade:
S31200, S31260, S31500,
S31803, S32003, S32205,
S32304, S32550, S32750,
S32900, S32950, S32760, S32520
Manufacture:
Welding, the joints are fully penetration double-welded or single-welded
Five Classes of pipes are covered :
Class 1 - Pipes shall be double welded by processes using filler metal in all passes and shall be
radiographed completely
Class 2 - Pipes shall be double welded by processes using filler metal in all passes.
No radiograph is required
Class 3- Pipes shall be single welded by processes using filler metal in all passes and
shall be radiographed
Class 4 - Same as Class 3, except that the weld pass exposed to the inside pipe surface is
permitted to be made without the addition of filler metal
Class 5 - Pipes shall be double welded by processes using filler metal in all passes and shall be
spot radiographed
TABLE 1 Heat Treatment
| UNS Designation | GradeA | Temperature,°F[°C] | Quench |
| S31200 | … | 1920-2010[1050-1100] | Rapid cooling in water |
| S31260 | … | 1870-2010[1020-1100] | Rapid cooling in water |
| S31500 | … | 1800-1900[980-1040] | Rapid cooling in air or water |
| S32205 | 2205 | 1870-2010[1020-1100] | Rapid cooling in air or water |
| S32304 | 2304 | 1700-1920[925-1050] | Rapid cooling in air or water |
| S32550 | 255 | 1900[1040],min | Rapid cooling in air or water |
| S32750 | 2507 | 1880-2060[1025-1125] | Rapid cooling in air or water |
| S32900 | 329B | 1700-1750[925-955] | Rapid cooling in air or water |
| S32950 | … | 1820-1880[990-1025] | Rapid cooling in air or water |
A Except as indicated, common name, not a trademark, widely used, not associated with any one producer.
B A grade designation originally assigned by the American Iron and Steel Institute (AISI).
Reference Documents:
ASTM Standard:
A 240/A 240M Specification for Chromium and
Chromium-Nickel Stainless Steel Plate, Sheet, and Strip
for Pressure Vessels and General Applications
A 480/A 480M Specification for General Requirements for
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
Sheet, and Strip
A 941 Terminology Relating to Steel, Stainless Steel, Related
Alloys, and Ferroalloys
A 999/A 999M Specification for General Requirements for
Alloy and Stainless Steel Pipe
E 426 Practice for Electromagnetic (Eddy-Current) Examination
of Seamless and Welded Tubular Products, Austenitic
Stainless Steel and Similar Alloys
