Patent ID: 7877159

Claim:
A method for managing production history information of a pipe or tube in a process for producing the pipe or tube to which thread cutting is performed on end portions thereof, the method comprising the steps of: machining an identifier for identifying the pipe or tube in a region of the pipe or tube on which the thread cutting is to be performed by machining means before an initial production process is performed among production processes which are management targets of the production history information; reading the identifier machined on the pipe or tube with reading means before each of the production processes is performed or while each of the production processes is performed; storing the production history information of the pipe or tube obtained in each of the production processes and the identifier read from the pipe or tube while the production history information and the identifier are associated with each other; and removing the identifier machined on the pipe or tube in the process of performing the thread cutting on the end portions of the pipe or tube among the production processes which are management targets of the production history information.