Quality improvement of SWRH72BCr wire rod for steel strand
To analyze key factors affecting qualification rate of SWRH72BCr wire rod for steel strands,it is believed that transverse cracks in continuous casting billets are main cause of wire rod scar defects.The addition of V element to wire rod not only increases hardenability but also separates pearlite and bainite transformation zones,increasing difficulty of control cooling for small-sized wire rods.The uneven cooling of Stelmor cooling line is direct reason for wire rod unquali-fied strength.By improving continuous casting process,adjusting Jialing device angle from 30° to 50° and fan air volume on Stelmor line,optimizing rolling process,wire rod average tensile strength is increased about 20 MPa,with maximum fluctuation of 80 MPa in tensile strength.The comprehensive product qualification rate is increased from 94.0％to 98.99％.
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