Method for guaranteeing final-cooling temperature precision for steel plates

Abstract

The invention discloses a method for guaranteeing final-cooling temperature precision for steel plates. The method includes the steps: a pyrometer A and a pyrometer B of the same model and having same parameters are mounted behind a cooling device in a direction parallel to the moving direction of a steel plate; a temperature that the pyrometer A measures is used as control application of an automatic control system, and a temperature that the pyrometer B measures is recorded in a database of the automatic control system; a difference between averages of temperatures that the pyrometers A and B measure in initial two online days is used as a standard difference; the pyrometer B is subjected to calibration check every 9-11 days so as to ensure accuracy of the temperature that the pyrometer B measures; the averages of the temperatures that the pyrometers A and B measure and those recorded in the control system are compared every two days, the temperature that the pyrometer A measures is compensated when changes of the difference between the averages exceeds a set threshold as compared with the difference between the averages of the temperatures that are measured in the initial two online days, and the difference between the temperature that is finally transmitted to the automatic control system by the pyrometer A and the temperature that is finally transmitted to the automatic control system by the pyrometer B is equalized to the standard difference.

Description

technical field [0001] The invention belongs to the technical field of hot rolling, and in particular relates to a method for ensuring the accuracy of the final cooling temperature of a steel plate. Background technique [0002] With the development of hot rolling technology, in addition to the controlled rolling technology, a controlled cooling process is also used in the production of many steel types to force cooling the rolled steel plate. The purpose is to increase the cooling speed of the steel plate after rolling and reduce the relative Change the temperature to achieve the purpose of refining the grain and improving the structure and properties of the steel plate. The final cooling temperature is one of the most important parameters in the controlled cooling process. The final cooling temperature directly determines the phase transition temperature of the steel plate and has an important impact on the final structure of the steel plate. In actual production, the zer...

AI Technical Summary

Problems solved by technology

In actual production, the zero point of the pyrometer used to detect the temperature of the steel plate after cooling often shifts, making the detected temperature inaccurate, and this phenomenon is difficult to be discovered by field operators. Due to the inaccurate detection temperature, the performance of the steel plate Fluctuations occur, and even a large number of mechanical properties exceed the standard requirements, which will adversely affect the stability of product quality