| 摘要 |
PURPOSE:To produce a wire rod which permits quick spheroidization in finish rolling of a steel wire rod by rolling the wire rod with the 1st finishing mill then cooling quickly the wire rod to a specific temp. and cooling the steel to cause transformation while said steel is kept applied with specific plastic strain with the 2nd finishing mill. CONSTITUTION:A steel wire rod is rolled with the 1st finishing mill and is then quickly cooled to a temp. range of 500-850 deg.C in the stage of forming the steel wire rod to a rod material by hot rough rolling and intermediate rolling then subjecting the same to finish rolling. The rolled steel is then applied with plastic deformation in a 20-80% range with the 2nd finishing mill and while the plastic strain is maintained, the steel is cooled to cause transformation so that fine pearlite, bentonite or martensite exists mixedly in the finely dispersed proeutectoid ferrite. The wire rod permitting easy spheroidization in the succeeding stage is thus obtd. The wire rod has the component compsn. consisting of 0.10- 0.70% C, 0.10-1.50% Si, 0.30-1.80% Mn and the balance Fe and inevitable impurities. |
