Method for the production of thick-walled tubes with a small diameter

摘要

A method of efficiently producing a thick-walled small diameter pipe having a smooth flawless inner peripheral surface, which can be suitably used for a fuel injection pipe for diesel engines, is provided. In producing a thick-walled small diameter pipe by applying a plurality of times of stretching to a seamless raw pipe, the method comprises the steps of cutting the work pipe into lengths for which the product size is taken into consideration, prior to the final stretching, applying cutting or grinding to the inner peripheral surface of such length, and effecting the final stretching by forging utilizing a pressing force provided by a press.