Cause analysis and control of fracture of 45 steel hot rolled wire rod during drawing
The chemical composition,microstructure,and fracture morphology of 45 steel hot rolled wire rods were studied to re-solve the problem of drawing fracture.The reasons of the drawing fracture of 45 steel were analyzed,and process improvement measures were proposed.The results indicate that the uneven microstructure and mixed crystals on the surface of 45 steel hot rolled wire rod,as well as the high proportion of ferrite in the microstructure,are the main reasons for the drawing fracture of 45 steel wire rod.The carbon mass fraction of 45 steel was increased from 0.43％-0.45％to 0.46％-0.48％,the finishing roll-ing temperature was reduced from 945 ℃ to 915 ℃,the wire feeding temperature was reduced from 940 ℃ to 890 ℃,the num-ber of fans was adjusted from 1#-7# to 1#-9#,and the starting roller speed of Stelmor air-cooled roller was increased from 0.70 m/s to 0.85 m/s(the speed of each subsequent roller section increased sequentially),effectively improving the microstruc-ture of 45 steel hot rolled wire rod,significantly increasing the proportion of pearlite,and improving the drawing performance of 45 steel hot rolled wire rod.
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