STEEL PIPE AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: A steel pipe and a manufacturing method thereof are provided to obtain high hardness and intensity due to excellent hardenability without separate thermal-process. CONSTITUTION: A method for manufacturing a steel pipe comprises: a step of arranging compound powder mixed with boron alloy iron powder which deborating area is formed in a part and object powder which boriding area is formed in a part inside the steel pipe(100); and a step of coagulating the mixing powder by heating and melting and forming a coating layer(205) inside the steel pipe while rotating, heating, and cooling the steel pipe.