MANUFACTURING METHDO FOR HIGH-HARDNESS MEDIUM-CARBON STEEL WIRE OF SUPERIOR DRAWAING PROPERTY

摘要

The present invention enables the upward adjustment of the drawing speed without performing the annealing heat treatment step, thereby reducing the disconnection rate during the drawing process, thereby reducing unnecessary energy consumption due to the annealing heat treatment, as well as reducing the manufacturing cost. In order to provide a method for producing a medium-carbon light steel wire with excellent drawability, carbon: 0.30 to 0.60%, silicon: 0.15 to 0.25%, manganese: 0.40 to 0.80%, sulfur: 0.01% or less, phosphorus: 0.02 % Or less, Al Al: 0.015% or less Billet (billet) is formed, and the billet is maintained at 1200 ℃ for 140 minutes, hot rolled with a wire diameter of 5.5mm, and after rolling the wire products to water spray By winding rapidly in the form of a coil while rapidly cooling to a temperature of 950 ~ 1050 ℃, 4 890 with cooling rate of 1 ℃ / sec Cooled to a range of 10 ° C., and 12 It is characterized by cooling to a range of 30 ° C. and then air cooling.