ASTM A358 discusses electric-fusion-welded austenitic chromium-nickel stainless steel pipe suitable for corrosive or high-temperature service, or both, or for general applications. The pipes are separated into five different classes. Class 1 needs to be double welded with filler metal and completely radiographed. Pipes of Class 2 also need to be double welded with filler metal, but with no radiography. Class 3 and Class 4 pipes need to be single welded except that the weld pass of the latter exposed to the inside pipe surface may be without any filler metal. Pipes of Class 5 need to be double welded with filler metal and spot radiographed. Weld defects must be repaired by removal to sound metal and rewelding. Subsequent heat treatment shall be as required on the original welds. The finished pipes must undergo a transverse tension test, a transverse guided-bend weld test, and a hydrostatic test.
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