Designation: A 249/A 249M – 02Used in USDOE-NE StandardsStandard Specification forWelded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes1This standard is issued under the fixed designation A 249/A 249M; the number immediately following the designation indicates the yearof 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 (e ) indicates an editorial change since the last revision or reapproval.1. Scope *1.1 This specification2 covers nominal-wall-thicknesswelded tubes made from the austeniticsteels listed in Table 1,with various grades intended for such use as boiler, super-heater, heat exchanger, or condenser tubes.1.2 Grades TP304H, TP309H, TP309HCb, TP310H,TP310HCb,TP316H,TP321H,TP347H,and TP348Hare modifications of Grades TP304, TP309S, TP309Cb,TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and areintended for high-temperature service such as for superheatersand reheaters.1.3 The tubing sizes and thicknesses usually furnished tothis specification are 1⁄8 in. [3.2 mm] in inside diameter to 5 in.[127 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1mm], inclusive, in wall thickness. Tubing having other dimen-sions may be furnished, provided such tubes comply with allother requirements of this specification.1.4 Mechanical property requirements do not apply totubing smaller than 1⁄8 in. [3.2 mm] in inside diameter or 0.015in. [0.4 mm] in thickness.1.5 Optional supplementary requirements are provided and,when one or more of these are desired, each shall be so statedin the order.1.6 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Wi...
