PURPOSE: To produce a high strength steel linear body having required straightness by subjecting a steel having a specified compsn. to heat treatment to straightening and further subjecting the straightened steel to a straightening before its cutting to a prescribed length.
CONSTITUTION: A steel contg., by weight, 0.20 to 0.40% C, 0.05 to 2.00% Si, 0.60 to 2.00% Mn and 0.10 to 2.00% Cr, and the balance Fe with inevitable impurities is subjected to hot rolling and is immediately subjected to rapid cooling in warm water to form into a linear body in which the diameter of a martensitic structure is regulated to about 10mm. This linear body is tempered, is thereafter subjected to straightening of ≤1.0% bending strain and is cut to a prescribed length to regulate the straightness in 1.5m of the cut linear body to ≤1.0mm. Thus, the steel linear body having required straightness without executing severe production control and inventory control can be obtd.
YOSHIDA SHINICHI
YAMAMOTO TAKUYA
MIKAMI TAIJI
