To provide a boiler steel pipe for a rifle tube, a steel plate for the boiler steel pipe, and its manufacturing method capable of eliminating seizure, cost-up, etc., which are likely with a conventional rifle tube with its inside surface furnished with a spiral pattern manufactured through a cold drawing process using a die or a plug.

The boiler steel pipe for the rifle tube, the steel plate for the boiler steel pipe, and its manufacturing method are characterized by that when a steel plate is put in hot rolling, a striped or stepped pattern is given to the surface of the steel pipe or the steel plate by subjecting the steel material to a ductile rolling process using a roll equipped with a striped or stepped pattern, and thereby the surface area of the steel plate and the thermal efficiency are increased.