| 摘要 |
It is a problem of the present invention to provide a method of manufacturing the seamless pipes having better mechanical properties, by means of a pipe manufacturing method with large energy-saving effect to continuously carry out processes from pierce-rolling to heat treatment. A method of manufacturing a seamless pipe comprising the steps of a pierce-rolling process, elongation rolling process, sizing process, reheating process, quenching process and tempering process, wherein the sizing process is completed with a temperature of the seamless pipe not less than 600� C. but less than 800� C., the seamless pipe is charged into a reheating furnace with a temperature not less than 400� C. and is reheated with a temperature not less than Ac3 transformation temperature but not greater than 1000� C. in the reheating process. |
