1.1This specification covers grades of stainless steel tubing in sizes under ¹/₂down to 0.050 in. (12.7 to 1.27 mm) in outside diameter and wall thicknesses less than 0.065 in. down to 0.005 in. (1.65 to 0.13 mm) for general corrosion-resisting and low- or high-temperature service, as designated in Table 1.

Note 1:The grades of austenitic stainless steel tubing furnished in accordance with this specification have been found suitable for low-temperature service down to −325°F (−200°C) in which Charpy notched-bar impact values of 15 ft·lbf (20 J), minimum, are required and these grades need not be impact tested.

(A)New designation established in accordance with Practice E527 and SAE J 1086, Practice for Numbering Metals and Alloys (UNS).

(B)For seamless TP316L tubes, the silicon maximum shall be 1.00 %.

(C)For welded TP 316 tubes, the nickel range shall be 10.0-14.0 %.

(D)Grade TP 321 shall have a titanium content of not less than five times the carbon content and not more than 0.60 %.

(E)Grades TP 347 and TP 348 shall have a columbium plus tantalum content of not less than ten times the carbon content and not more than 1.0 %.

1.2Optional supplementary requirements are provided and, when desired, shall be so stated in the order.

1.3The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.