BASE MATERIAL FOR DRAWING AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a base material for drawing and its manufacturing method for performing high-quality drawing maintaining a highly accurate dimension even in the case that a specific cross section (complicated cross-sectional shape) is drawn. SOLUTION: The ratios of the longitudinal and lateral dimensions of the base material 12 before drawing to the longitudinal and lateral dimensions of steel having a special cross section manufactured by drawing are respectively chosen to be 102 to 120% and the difference between the rate of dimensional reduction in the longitudinal dimension of the steel to that of the base material and the rate of dimensional reduction in the lateral dimension is taken as <6%. COPYRIGHT: (C)2004,JPO