Note B: For small diameter or thin walls or both, where many drawing passes
are required, a carbon maximum of 0.040 % is necessary in grades
TP304L and TP316L. Small outside diameter tubes are defined as those
less than 0.500 in. [12 mm] in outside diameter and light wall tubes
as those less than 0.049 in. [1.24 mm] in average wall thickness
(0.044 in. [1.12 mm] in minimum wall thickness).