ASTM A213 is a standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. This specification covers minimum wall thickness, seamless ferritic and austenitic steel, boiler and superheater tubes, and austenitic steel heat-exchanger tubes, designated Grades T5, TP304, etc. The ASTM A213 specification is widely used in the manufacturing of boilers, superheaters,