This specification covers grades of stainless steel tubing in sizes under 1/2 down 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 %.

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

1.3 The 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.

annealing and pickling surface, bright annealing surface, OD polished surface, OD & ID polished surface etc.