Manufacturing method of hard steel wire with excellent tensile strength and excellent drawing property

摘要

The present invention relates to a method for producing a hard steel wire used for wire rope, hose wire, belt cord, and the like, and an object thereof is to provide a method for manufacturing a hard steel wire having a uniform tensile strength over the entire length of the wire coil and excellent wire workability.;The present invention for achieving the above object is a winding machine (20) for winding the rolled wire rod by rolling the billet, and a cooling table (30) provided with a plurality of support rolls 32 to cool and transport the wound wire rod; In the manufacturing method of the wire rod using the wire rod rolling line including an integrator 40 to accumulate the cooled wire rod, the emphasis of the billet in weight%, C: 0.60-0.75%, Si: 0.01-0.30%, Adjusting to Mn: 0.30 to 1.0%, P: 0.02% or less, S: 0.02% or less, residual Fe and unavoidable impurities; Rolling the billet adjusted by the wire rod as described above to cool to a temperature of 850 ~ 750 ℃ before winding: alternately alternately guide screw 34 of the screw-shaped guide roll 34 at one end of the support roll 32 of the cooling table Furnace mounting step; And moving the speed of the cooling table equipped with the guide roller in the form of a screw in a range of 0.9 to 1.15 m / sec and zigzag so that the coil side of the wire rod is out of a range of 20 to 90 mm. The present invention relates to a method for producing a hard steel wire having excellent tensile strength and excellent drawing property.