This standard is issued under the fixed designation A 405; 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 nominal (average) wall seamless, annealed or normalized and tempered alloy steel pipe intended for high-temperature service after special heat treatment. pipe ordered to this specification shall be suitable for bending, flanging. (vanstining), and similar forming operations, and for fusion welding. the pipe shall be given a special heat treatment after ant shop fabrication and prior to installation in service.
1.2 The high-temperature properties of the materials covered in this specification are dependent upon special heat treatment that is required. Although the high-temperature properties are not specified, they are implied by control of chemistry, heat treatment and room-temperature properties chemistry, heat treatment and room-temperature properties.
1.3 The manufacturer shall furnish the pipe in the annealed or normalized and tempered condition, and shall demonstrate that the pipe when specially heat treated, will be capable of meeting the prescribed ambient temperature properties.
1.4 Supplementary requirements of an optional nature are provided. these supplementary requirements call for additional tests to be made, and, when desired, shall be so stated in the order together with the number of such tests required.
1.5 The values stated in inch-pound units are to be regarded as the standard.

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