ASTM A358

Description / Abstract: This specification covers electric-fusion welded austenitic chromium-nickel alloy steel pipe suitable for corrosive or high-temperature service. or both. (Although no restrictions are placed on the sizes of pipe which may be furnished under this specification. commercial practice is commonly limited to sizes not less than NPS 8).

This specification covers nineteen grades of alloy steel as indicated in Table 1. The selection of the proper alloy and requirements for heat treatment shall be at the direction of the purchaser, dependent on the service conditions to be encountered.

Five classes of pipe are covered as follows:

Class 1-Pipe shall be double welded b processes employing filler metal in all passes and shall be completely radiographed.

Class 2 Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.

Class 3 Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.

Class 4-Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal (see 5.2.2.1 and 5.2.2.).

Class 5 Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed. Supplementary requirements covering provisions ranging from additional testing to formalized procedures for manufacturing practice are provided.

Supplementary Requirements S1 through S6 are included as options to be specified when desired. The values stated in inch-pound units are to be regarded as the standard.