According to ASTM specifications, this particular specification pertains to seamless ferritic and austenitic steel tubes for use in boilers, superheaters, и теплообменники. The specific grades covered by this specification include T5, ТП304, and others listed in Tables 1 и 2. The tubing size ranges from an internal diameter of 1/8 inch up to an outer diameter of 5 дюймы, with thicknesses ranging from 0.015 к 0.500 дюймы (0.4 мм до 12.7 мм). If other sizes are required, they can be specified as part of the order, along with minimum and average thicknesses.