A stable control method for finishing rolling temperature of high-grade pipeline steel

Abstract

The invention discloses a method for stabilizing the final rolling temperature of high-grade pipeline steel, comprising the following steps: heating pipeline steel; rough rolling the heated pipeline steel; Finish rolling the pipeline steel; the step of finishing rolling the pipeline steel after rough rolling includes: using a constant speed to finish rolling the pipeline steel; The cooling water is turned on by the rack, and after the seventh rack bites the steel for a preset time, the cooling water is turned off. The method for controlling the temperature stability of finishing rolling of high-grade pipeline steel provided by the present invention adopts a constant speed for finishing rolling to improve the stability of finishing rolling temperature, and adopts the cooling water between the F1 and F4 stands, and the cooling water between the F1 and F4 stands is used to pass the water of the head F4 stand. The use of the steel strip reduces the final rolling temperature of the strip head, so as to achieve the purpose of stabilizing the overall final rolling temperature.

Description

technical field [0001] The invention relates to the field of rolling control methods, in particular to a stable temperature control method for finishing rolling of high-grade pipeline steel. Background technique [0002] The main function of pipeline steel is to undertake the transportation of oil and natural gas after it becomes a steel pipe through spiral submerged arc welding or straight seam submerged arc welding. With the advancement of national key projects such as the West-East Gas Pipeline and Sichuan-East Gas Pipeline, the demand for pipeline steel is increasing day by day. , especially the high-grade pipeline steel represented by X80. Because X80 pipeline steel has extremely high requirements on comprehensive properties such as strength, hardness and impact toughness, it has extremely high requirements on the uniformity of strip steel finishing rolling temperature. [0003] In the prior art, there are mainly two strategies for controlling the finishing temperature...

AI Technical Summary

Problems solved by technology

For example, a company’s 2050mm hot rolling line uses speed and acceleration to control the final rolling temperature. For conventional varieties, the final rolling temperature of the strip can be controlled at ±20°C, but the temperature difference between the head and the tail of the high-grade pipeline steel is >20°C. ℃, leading to a large difference in head-to-tail performance, which needs to be controlled and treated

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