HIGH-STRENGTH WIRE ROD FOR COLD HEADING, HAVING EXCELLENT HEAT TREATMENT CHARACTERISTICS AND HYDROGEN DELAYED FRACTURE CHARACTERISTICS, HEAT TREATMENT COMPONENT, AND MANUFACTURING METHODS THEREFOR

摘要

Disclosed in the present specification are: a high-strength wire rod for cold heading, having excellent heat treatment characteristics and hydrogen delayed fracture characteristics, the rod being applicable to a bolt and the like; a heat treatment component; and manufacturing methods therefor. According to one embodiment of the disclosed high-strength wire rod for cold heading, with excellent heat treatment characteristics and hydrogen delayed fracture characteristics, the wire rod comprises, by wt%, 0.3-0.6% of C, 0.05-0.3% of Si, 0.2-1.0% of Mn, 0.5-2.0% of Cr, 0.5-2.0% of Mo, 0.02-0.05% of Al, 0.01-0.03% of N, and the balance of Fe and other impurities, wherein the microstructure comprises, by area fraction, 80% or more of bainite, 1-15% of pearlite and 0.1-2% of martensite, and 2Х1019/m3 or more of aluminum nitride having a diameter of 5-50 nm is contained.