Hot-rolled strip steel laminar cooling finite element modeling method

Abstract

The invention relates to a hot-rolled strip steel laminar cooling finite element modeling method, aims to solve the problem that a new steel laminar cooling process is difficult to quickly and effectively formulate through accurate finite element modeling, and belongs to the field of ferrous metallurgy. According to the principle, grids are divided in the width direction, the thickness direction and the length direction of strip steel; converting the motion of the strip steel into reverse motion with the same speed of the laminar cooling header; setting a strip steel surface heat exchange coefficient along the width direction of the strip steel; a temperature, phase change and stress-strain multi-field coupling model is adopted for strip steel laminar cooling process calculation, the stripsteel surface heat exchange coefficient is optimized according to the difference value between the temperature calculation value and the actual value, and therefore the optimal strip steel laminar cooling finite element model is obtained. When the model is used for laminar cooling calculation of the new steel grade, the control conditions of the new steel grade under different cooling strategiescan be quickly and accurately obtained, the efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a finite element modeling method for laminar flow cooling of hot-rolled strip steel. Background technique [0002] The iron and steel industry is an important pillar industry supporting the development of the national economy, and the development level of the modern iron and steel industry is an important manifestation of a country's technological progress and comprehensive national strength. For hot-rolled strip steel, its performance depends not only on the hot-rolling process, but also on the controlled cooling technology after rolling. Whether the hot-rolled coiling temperature and its performance after off-machine can be controlled within the required range mainly depends on the control of the cooling system of the hot-rolled strip after the finishing mill. [0003] Generally, the coiling temperature varies with the steel grade, and the coiling temperatu...

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Problems solved by technology

[0005] The present invention aims at the technical problem that the accuracy of the test results obtained by the laminar flow cooling obtained by the prior art scheme is not high, which leads to the technical problem that the accurate laminar flow cooling control strategy cannot be obtained, and proposes a hot-rolled strip laminar flow cooling finite element modeling method , the purpose of which is to be able to determine the heat transfer coefficient at various places on the strip surface during the laminar cooling process, so as to overcome the problem of incomplete calculation in the prior art

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