According to ASTM specifications, this particular specification pertains to seamless ferritic and austenitic steel tubes for use in boilers, superheaters, e scambiatori di calore. The specific grades covered by this specification include T5, TP304, and others listed in Tables 1 E 2. The tubing size ranges from an internal diameter of 1/8 inch up to an outer diameter of 5 pollici, with thicknesses ranging from 0.015 A 0.500 pollici (0.4 mm a 12.7 mm). If other sizes are required, they can be specified as part of the order, along with minimum and average thicknesses.