1.1 This specification covers seamless stainless tubing for use in mechanical applications where corrosion-resistant or high-temperature strength is needed. The grades covered are listed in Table 1 , Table 2 , and Table 3 . (A) For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040% carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness). (B) Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements. (C) The range of (Al + Ti) shall be within 0.85-1.20%. (A) MT446-2 is a lower carbon version of MT446-1, that has a lower tensile strength but improved ductility and toughness. (B) Carbon plus nitrogen = 0.025 max%. (A) Maximum, unless a range or minimum is indicated. Where ellipses appear in this table, there is no requirement and analysis for the element need not be determined or reported. (B) % Cr + 3.3 X % Mo + 16X % N >= 40. 1.2 This specification covers seamless cold-finished mechanical tubing and seamless hot-finished mechanical tubing in sizes up to 123/4 in. [325 mm] in outside nominal diameter (for round tubing) with wall thicknesses as required. 1.3 Tubes shall be furnished in one of the following shapes, as specified by the purchaser: round, square, rectangular, or special. 1.4 Optional supplementary requirements are provided and when desired, shall be stated in the order. 1.5 The values stated in inch-pound units are to be regarded as the standard. Within the text, the SI units are shown in square brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.