METHOD FOR CORRECTING PIPE END OF SEAMLESS PIPE FORMED FROM HIGH-CR STAINLESS STEEL

摘要

A method for correcting the inner diameter of a pipe end of a seamless pipe formed from high-CR stainless steel containing 8 to 35 mass% of CR and 0.1 to 10 mass% of Ni comprises: a pipe end correction step with which the pipe end part of a seamless pipe is enlarged by inserting a plug for inner diameter correction into the pipe end part after a step for pipe production by hot working and a heat treatment step, when oxide scale build-up is generated on the inside surface at the pipe end part of a seamless pipe; and a step for forming a lubricant film with which, prior to this pipe end correction step, a lubricant is applied to the inside surface at the pipe end part of a seamless pipe and/or the plug surface to form a lubricant film. As a result, the formation of seizure marks on the inside of the pipe end part can be prevented when a high-CR stainless steel seamless pipe is produced.