SQUEEZING-CONTRACTION PROCESSING METHOD OF HIGH-STRENGTH ELECTROSEAMED STEEL PIPE, AND PROCESSED COMPONENT

摘要

PROBLEM TO BE SOLVED: To achieve high strength and wall thickness reduction of automobile components by providing a high-strength steel pipe of TS980 MPa class or above by the squeezing-contraction work.SOLUTION: In the squeezing-contraction processing method for squeezing a pipe end in a tapered shape, or contracting the partial length or the entire length of the pipe by pressing a stock pipe consisting of an electroseamed steel pipe 1 into a hole die 2, the pipe end on the pressing side of the stock pipe is heated to 450-550°C before pressing the stock pipe into the hole die.