Various behaviors of T91 type steel tube materials and the manufacturing technology for tube-rows of said steel tubes have been studied. On the basis of testing and research

a batch of tube-rows for T91 type steel tubes has been successfully manufactured. Analysis from various aspects

such as raw materials of the steel tubes

welding material and welding process

tube-bending technology

as well as heat treatment etc.

for ensuring the quality of manufactured tube-rows has been performed

and some key points which should be grasped being also given.