ASTM A789 UNS S32750 Super Duplex 2507 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 

TABLE 1 Heat Treatment

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).

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

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