Method for accurately controlling band-steel ductility when welding joints pass leveling machine

Abstract

The invention discloses a method for accurately controlling band-steel ductility when welding joints pass a leveling machine. The method includes steps that firstly, when band steel moves to the welding joints and is close to the leveling machine, the moving speed of the band steel is reduced to 30-70m / min, and the welding joints needs to be more 1m away from the leveling machine after speed reduction; when the band steel moves to the welding joints and passes the leveling machine, rolling force is reduced to 80-150 tons; when the band steel moves to the welding joints and goes through the leveling machine, a current practical ductility value and a ductility target value are compared, if the former is larger than the latter, rolling force is 300-800 tons; if the former is smaller than the latter, rolling force is 90-150 tons, and if the former is equal to the latter, all steps are finished; the band steel keeps moving, whether the current practical ductility value is approximate to the ductility target value or not is judged, if yes, the next step is performed, and if not, rolling force rises at the speed of 500-1500 tons; the steps are finished.

Description

technical field [0001] The invention relates to a production control method in a metallurgical process, in particular to a strip elongation control method. Background technique [0002] The elongation of the temper mill in the cold rolling continuous annealing unit is the key process parameter of the continuous annealing cold plate, which determines the final performance of the strip product. Such as figure 1 as shown, figure 1 Shows a simple diagram of the arrangement of continuous annealing and tempering mills in the prior art. The steel strip 13 is under tension at the tension rolls 11 and 12 located before and after the tempering mill 10, and is temper rolled at the tempering mill 10. Therefore, the control of the elongation of the temper mill is mainly determined by the temper rolling force and the tension before and after tempering. The rolling force of the temper mill is the key factor to control the elongation accuracy of the temper mill. [0003] In the prior art...

AI Technical Summary

Problems solved by technology

This section of steel strip whose elongation fluctuates greatly cannot meet the process requirements, so it must be cut off, resulting in a lot of waste

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