.A method of manufacturing meduium carbon steel wire rods for spheroidization heat treatment

摘要

PURPOSE: Provided is a method of preparing a medium carbon steel wire rod having the good spheroidization heat treatment property which is widely used in the matter for constructing machinery such as bolt and nut. CONSTITUTION: The preparation method of a medium carbon steel wire rod having the good spheroidization heat treatment property is characterized by hot rolling at the temperature of 1050 to 1150 deg.C so as to maintain at least 90% in the pearlite fraction of the medium carbon steel wire rod microstructure, and then cooling in a cooling rate of 10 to 30 deg.C/sec to control the transformation temperature of ferrite to not more than 650 deg.C.