Method for processing steel tubes and the likes

Abstract

A method for processing a steel tube includes the following steps: a softening step, in which a tube-to-be-processed is heated so that material property of the tube-to-be-processed is softened; a cooling step, in which the heated tube-to-be-processed is cooled down to a normal temperature; a wall cutting step, in which the cooled tube-to-be-processed is subjected to cutting by lathing an end section thereof so as to reduce wall thickness of the tube-to-be-processed at the end section; and a shrinking step, in which the thickness reduced section of the wall lathed tube-to-be-processed is subjected to compression to have an inner bore thereof shrunk and thus reduced, whereby occupation of the inner bore of the shrunk tube-to-be-processed by the wall thickness of the tube-to-be-processed is reduced so as to obtain a possible maximum inside diameter of the inner bore and prevent the tube-to-be-processed from undesired deformation and breaking.

1 . A method for processing a steel tube, comprising the following steps:
 a softening step, in which a tube-to-be-processed is heated so that material property of the tube-to-be-processed is softened;   a cooling step, in which the heated tube-to-be-processed is cooled down to a cooled temperature;   a wall cutting step, in which the cooled tube-to-be-processed is subjected to cutting by lathing an end section thereof so as to reduce wall thickness of the tube-to-be-processed at the end section; and   a shrinking step, in which the thickness reduced section of the wall lathed tube-to-be-processed is subjected to compression to have an inner bore thereof shrunk and thus reduced.   
     
     
         2 . The method according to  claim 1 , wherein the tube-to-be-processed is heated to a temperature in a range of 800-1,200° C. 
     
     
         3 . The method according to  claim 1 , wherein the cooled temperature to which the heated tube-to-be-processed is cooled down is room temperature.