A Calculation Method Applicable to Strip Temperature in Rapid Cooling Section of Continuous Annealing Unit

Abstract

The invention discloses a calculation method suitable for the strip steel temperature in the fast cooling section of a continuous annealing unit, belongs to the technical field of continuous annealing, solves how to effectively avoid the measurement error caused by the temperature detected by a sensor, and realizes accurate prediction of the performance of the exit strip steel The problem, the steps include strip specific heat capacity c, strip mass m, strip temperature T when entering the fast cooling zone r , The comprehensive radiation coefficient C of the sample to the cooling wall L , the average temperature of the cooling gas T b , contact area S, furnace temperature T j , gas ejection velocity v, airflow spacing l, etc.; by accurately forecasting the strip outlet temperature in the fast cooling section of the continuous annealing unit, the quality of the finished strip can be predicted in advance. Forecasting can adjust and control the inlet temperature of the continuous annealing section and the furnace temperature in time to achieve the ideal strip steel outlet temperature, which ensures the high-speed production of the continuous annealing unit, improves the production efficiency, and increases the economic benefits of the enterprise.

Description

technical field [0001] The invention relates to the technical field of continuous annealing, in particular to a method for calculating the temperature of strip steel in the fast cooling section of a continuous annealing unit. Background technique [0002] In recent years, with the rapid development of automobiles, home appliances, electronics, and packaging industries, strip steel users have higher and higher requirements for product quality. The strip steel produced by cold rolling will have the defect of work hardening due to the continuous pressing of each stand, which makes the strip steel hard and low in plasticity, which is extremely unfavorable for the subsequent processing and forming of cold rolled strip. Therefore, the steel strip produced by cold continuous rolling often needs to be adjusted and improved by the annealing unit for mechanical properties. Continuous annealing is more and more popular in large iron and steel enterprises because of its continuous prod...

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Problems solved by technology

At present, most continuous annealing units install temperature sensors at the exit of the cooling section to detect the temperature of the strip steel at the exit of the fast cooling section. With the increase of the service life of the sensor, the strip temperature accuracy of the sensor test will be seriously disturbed. Then when the temperature with errors is transmitted from the sensor to the computer interface of the on-site operator, it will bring misjudgment to the operator. After modifying the process parameters of the cooling section on the basis of the judgment, the mechanical properties of the continuous exit strip steel products are not good, which brings great economic losses to the enterprise.

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