Application of ASTM A**3 Alloy Seamless Steel pipes:
Pipe ordered under this specification is for manufacturing wall
panel, economizer, superheater and steam pipeline of boilers
Manufacturing Process of ASTM A**3 Alloy Seamless Steel
Tubes:
ASTM A**3 alloy seamless steel tubes are produced either by
cold-drawn or hot rolled, as specified. Grade TP**7HFG 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.