Method for manufacturing seamless pipes or tubes

Details Method for manufacturing seamless pipes or tubes Method for manufacturing seamless pipes or tubes

2007-11-13

2007-11-13

Tolan, Ed (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S095000

Reexamination Certificate

active

11485979

ABSTRACT:
A method for manufacturing a seamless pipe, capable of preventing the carburization phenomenon that occurs in a manufacturing process of pipe and simplifying an elongation rolling process, is provided. In this method, after piercing in the piercing rolling process, rolling is performed without using an inside regulating tool in the elongation rolling process, or without performing the elongation rolling followed by reducing rolling in a reducing rolling process, and thickening is then performed by use of a cold mill or cold draw bench in a cold rolling process. According to this method, the trap of graphite fine particles in the inner and outer surfaces of the pipe that took place in the conventional elongation rolling process can be minimized to prevent the carburization of the pipe. The method of the present invention is effective, particularly as a measure for preventing the carburization of an ultra-low carbon stainless steel or high alloy steel.

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C. Hayashi, “Manufacturing Method of Steel Pipe”, Iron and Steel Institute of Japan, Oct. 10, 2000, pp. 123-129.

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