Coiling shape control method for medium-high carbon steel with omega (C) larger than or equal to 0.45%

Abstract

The invention relates to a coiling shape control method for medium-high carbon steel with omega (C) larger than or equal to 0.45%. The control method comprises the following steps that (1) when a coiling model receives the steel grade, CT temperature, thickness and width of strip steel conveyed by a finish rolling model, and according to parameter values already set by a model background, the coiling unit tension required by the strip steel and the pressure value of a corresponding pinch roll are calculated out ; (2) after the pinch roll at the head of the strip steel bites steel, the pinch roll enters pressure ring control according to previously-set pressure; (3) the head of the strip steel is wound to a winding drum; (4) after the tail of the strip steel is subjected to F7 steel throwing, the pinch roll begins to output reverse torque, and tension building between the winding drum and finish rolling gradually begins to turn to tension building between the winding drum and the pinch roll; and (5) after F7 steel throwing, the coiling tension is reduced through the winding drum and finish rolling and turns to tension building of the winding drum and the pinch roll till strip steel coiling is completed. The strip steel coiling quality is guaranteed to the maximum degree. Similar problems exist in hot continuous rolling production lines.

Description

technical field [0001] The invention relates to a control method, in particular to a coil shape control method of medium-high carbon steel with ω(C)≥0.45%, belonging to the technical field of hot rolling production. Background technique [0002] For medium-high carbon steel with ω(C)≥0.45%, due to its steel type characteristics, the steel coil must be unloaded in time after production and must not stay in the coiler, and prevent the cooling water of the coiler from spraying it. It is transported to the slow cooling wall area through the coiling transport chain, and the finishing must enter the slow cooling wall for slow cooling within 90 minutes, so this steel type has high requirements on the coil quality. The stagnation in the coiler or the storage area cannot be hoisted due to the quality of the coil, and the steel coil cannot enter the slow cooling wall in time, which will cause serious problems such as cracking or even scrapping of the steel coil. [0003] However, in ...

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Problems solved by technology

[0005] The present invention aims at the problems existing in the prior art, and provides a method for controlling the coil shape of medium-high carbon steel with ω(C)≥0.45%. The flat coil problem caused by the phase change, and after high tension coiling to solve the phase change flat coil after rolling, the coil shape at the end of the coil is more serious overflow edge and misalignment problem, which greatly reduces the cost of medium and high carbon steel coil shape repair percentage

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