ASTM A213 Standard covers seamless ferritic and austenitic steel
boiler, superheater, and heat-exchanger tubes.
Grades containing the letter H in their designation have
requirements different from those of similar grades not containing
the letter H. These different requirements provide higher
creep-rupture strength than normally achievable in similar grades
without these different requirements. The tubes shall be made by
the seamless process and shall be either hot finished or cold
finished, as specified. Grade TP347HFG shall be cold finished. Heat
treatment shall be done separately and in addition to heating for
hot forming. The ferritic alloy and ferritic stainless steels shall
be reheated. On the other hand, austenitic stainless steel tubes
shall be furnished in the heat-treated condition. Alternatively,
immediately after hot forming, while the temperature of the tubes
is not less than the minimum solution temperature, tubes may be
individually quenched in water or rapidly cooled by other means.
Tension test, hardness test, flattening test, and flaring test
shall be done to each tube. Also, each tube shall be subjected to
the nondestructive electric test or hydrostatic test.
A213 Alloy Boiler Tube Chemical Requirements