Metal tube and its production method

摘要

A small diameter metal tube having at least two inner diameters is provided. A method for producing this metal tube is also provided. In this method, a plate member (5) having a development shape of the metal tube (8) is blanked from a metal thin plate (4) so that the plate member (5) is left partly tied to the metal thin plate (4), the plate member (5) is press formed into a tubular body having the at least two inner diameters, and the plate member (5) partly tied to the metal thin plate (4) is cut apart to produce the metal tube (8) having at least two inner diameters.