This standard is issued under the fixed designation A 789; 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 specification2 covers grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion cracking. These are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
NOTE 1-For tubing smaller than 1/2 in. [12.7 mm] in outside diameter, the elongation values given for strip specimens in Table 1 shall apply. Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in outside diameter or with walls thinner than 0.015 in. [0.4 mm].
1.2 The values stated in either inch-pound units or SI units are to be regarded 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 values form the two system may tesult in nonconformance withe the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
