ASTM A312 – Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.

The pipe shall be manufactured by one of the following processes:

1) Seamless (SML) pipe shall be made by a process that does not involve welding at any stage of production.

2) Welded (WLD) pipe shall be made using an automatic welding process with no addition of filler metal during the welding process.

3) Heavily cold-worked (HCW) pipe shall be made by applying cold working of not less than 35 % reduction in thickness of both wall and weld to a welded pipe prior to the final anneal. No filler shall be used in making the weld. Prior to cold working, the weld shall be 100 % radiographically inspected.