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METHOD FOR PREVENTING SURFACE CRACK AT THE TIME OF HOT WIDTH DRAWING DOWN ROLLING OF CONTINUOUSLY CAST SLAB
METHOD FOR PREVENTING SURFACE CRACK AT THE TIME OF HOT WIDTH DRAWING DOWN ROLLING OF CONTINUOUSLY CAST SLAB
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机译：连铸板坯热轧下拉时防止表面裂纹的方法
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摘要
PURPOSE: To suppress a surface crack defect occurring at the time of a width adjustment by specifying respectively the temperature range and the frequency of cooling and recovery of heat, further edging drafts of the first, second and succeeding runs after a steel containing one kind or two kinds or over of a prescribed trace metal and trace nitrogen of a prescribed quantity or over is continuously cast. ;CONSTITUTION: An aluminum killed steel or an aluminum silicon killed steel with N≥20ppm, containing either one kind or two kinds or over of 0.020 to 0.100% Al, 0.005 to 0.100% Nb, 0.005 to 0.150% V, and 0.005 to 0.100% Ti, is cast to a slab by a curvature type continuous casting machine. A hot edging rolling is performed to this slab 6 without cooling it after repeating two times or over of cooling and recovery of heat, by which a temperature within 10mm from the surface of the slab is cooled to Ar3-100°C or below and is raised to 1000°C or over and 1250°C or below from and after a final bending straightening by the curvature type continuous casting machine. At that time, a first edging draft is set to 5% or below and the second and succeeding drafts are set to 5% or over.;COPYRIGHT: (C)1996,JPO
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