This standard is issued under the fixed designation A 790; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ュ) indicates an editorial change since the last revision or reapproval.

1. Scope
1.1 This specification covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stree corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
1.2 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplememtary requirements call for additional tests to be made and when desired, one or more of these may be specified in the order.
1.3 Table X1.1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.
1.4 The values stated in either inch-pound units or SI units are to be regarede separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining valuses from the two systems may result in nonconformance with the specification.The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

NOTE 1-The dimensionless designator NPS (nominal pipe size)has been substituted in standard for such traditional terms as "nominal diameter,""size,"and "nominal size."