| 摘要 |
PROBLEM TO BE SOLVED: To efficiently peel a scale of a hot rolled material, i.e., a slab before slab and a rolling material in rolling by one line header in order to reduce power consumption while heeping good descaling capability. SOLUTION: When a high pressure water from descaling nozzles 1, 1a, 1b is collided on the surface of a hot rolling material 4, the descaling nozzles 1, 1a, 1b are arranged as satisfying a formula of Cn×P×Q×D2×sin2 (θ/2+β)/(L12×L2)>=100 (N) so that the high pressure water is collided at an interval L2 in the rolling material width direction, wherein L1=2×H×tan(θ/2) cosα, L2=Pt-L1×cosθ. Wherein, Cn: nozzle loss coefficient, P: header back pressure (kgf/cm2), Q: nozzle flow rate (L/min), D: nozzle orifice diameter (mm),θ: spray spread angle (deg),β: nozzle twist angle (deg), H: nozzle height (mm),α: nozzle attack angle (deg), L1: spray region width (mm), L2 non-overlap width (mm), Pt: nozzle pitch (mm).
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