Hot-rolling method of steel piece joint during continuous...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 7/13 (2006.01) B21B 1/22 (2006.01) B21B 1/38 (2006.01) B21B 37/16 (2006.01) B21B 37/26 (2006.01) B21B 37/28 (2006.01) C21D 8/00 (2006.01) B21B 13/02 (2006.01) B21B 15/00 (2006.01) B21B 37/38 (2006.01)

Patent

CA 2173066

A method for continuously hot-rolling steel pieces, includes butt-joining the rear end of the preceding steel piece and the leading end of the succeeding steel piece, then finish-rolling the butt-joined steel pieces by supplying a continuous hot rolling facility provided with a plurality of stands having a bending function of a work roll. The method involves estimating the variation of the rolling force occurring during rolling the joint of the steel pieces at the non-stationary zone caused by said joint, calculating the changing bending force of the work roll during rolling the joint of the steel pieces from the estimated variation of the rolling force, and determining the pattern for changing the bending force taking account of said changing force, and rolling the joint of the steel pieces by regulating the bending force in response to said pattern over at least one stand, while tracking down the joint of the steel piece immediately after joining.

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