Microalloyed steel continuous casting cooling control method based on steel grade solidification characteristic and evolution of microstructures
A technology of cooling control and micro-alloyed steel, which is applied in the field of quality control of iron and steel metallurgical continuous casting slabs, and can solve problems such as the degree of center segregation of aggravated solute elements
Active Publication Date: 2017-05-24
UNIV OF SCI & TECH BEIJING
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However, this patent ignores the influence of strong cooling in the vertical section of the continuous casting machine on the central equiaxed grain rate of the continuous casting slab, which tends to aggravate the central segregation of solute elements
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[0025] Using the Gleeble thermal simulation test machine to study and analyze the thermoplasticity of the surface structure of YQ450NQR1 steel continuous casting slab under different cooling rates, determine the influence of cooling rate on thermoplasticity, and obtain the change of area shrinkage of steel samples with temperature under different cooling rates curve( figure 1 ). With the reduction of area of 60% as the evaluation standard, determine the range of the third brittle temperature range. Using the cellular automata-finite element method to carry out numerical simulation calculations on the solidification structure of the continuous casting billet, determine the position of the columnar grain-equiaxed grain transition point ( figure 2 ). On this basis, by adjusting the degree of superheat and the amount of secondary cooling water, its influence on the central equiaxed grain rate of the continuous casting slab is analyzed.
[0026] The influence of the continuou...
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Abstract
The invention relates to a microalloyed steel continuous casting cooling control method based on the steel grade solidification characteristic and evolution of microstructures. The critical technical contents of the microalloyed steel continuous casting cooling control method comprise steel grade solidification characteristic experimental analysis, continuous cast blank solidification structure numerical simulation, continuous casting cooling process water amount regulation and control and the like. Change rules of the thermoplasticity and a third brittle temperature range of a target steel grade at different cooling rates are determined through experiments at first, then the influences of the cooling rates on austenite/ferrite transformation and the microalloy element second-phase particle precipitation law are comprehensively analyzed with te combination with the experiments, and finally, the microalloyed steel square blank continuous casting cooling precise control strategy of "low superheat pouring, low cooling of a third secondary cooling zone and high cooling of a fourth secondary cooling zone" is provided, relevant regulation and control schemes, that is, the superheating temperature is 23 DEG C (the original value is 37 DEG C), the water amount of the third secondary cooling zone is 2.6 L/min (the original value is 51.5 L/min), and the water amount of the fourth secondary cooling zone is 165.6 L/min (the original value is 18.4 L/min) are made a new continuous casting secondary cooling regulation and control mechanism based on the microalloyed steel characteristic is built, a cast blank solidification structure is optimized, and the strength of a surface microstructure of the solidification structure is improved.
Description
technical field [0001] This patent relates to the technical field of iron and steel metallurgy continuous casting slab quality control, and is applicable to the continuous casting production of microalloyed steel. The high equiaxed grain rate and good surface structure strength of continuous casting slab play an important role in reducing the macro-segregation of elements and reducing the incidence of surface cracks in the straightening process. This patent clarifies the solidification characteristics and microstructure evolution law of steel grades through experimental research combined with relevant mathematical models. On this basis, a cooling control method for microalloy steel continuous casting based on steel grade solidification characteristics and microstructure evolution laws is proposed , using this method can increase the equiaxed crystal ratio of microalloyed steel continuous casting slab and at the same time strengthen the surface structure of the slab and improve...
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IPC IPC(8): B22D11/124B22D11/22
CPCB22D11/124B22D11/225
Inventor 刘青窦坤韩延申孟令涛刘少伟曹玲玲文艳梅李有怀
Owner UNIV OF SCI & TECH BEIJING
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