Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine

Abstract

The invention relates to a method for calculating the thickness of a slab shell at the position of a continuous casting roller row and the solidification tail end of a casting machine. The method is characterized by comprising the following steps: according to a rule that zero plasticity temperature is approximately equal to solidus temperature, acquiring the thickness of the slab shell at the position of a pulling-straightening roller by searching point-shaped cracks on a low magnification of a continuous casting slab and measuring the distance from the cracks to the edge part of the casting slab; and according to the measured thickness of the slab shell at the position of a roller farthest from the meniscus, the position of a corresponding roller row and a pulling speed, further reckoning the comprehensive solidification coefficient and the liquid phase cavity length of the casting machine through secondary application of a solidification law square root formula, so that the effect of nail shooting or solidification model calculation is achieved. The invention discloses the method which does not need a model, does not need nail shooting and deduces the thickness of the slab shell and the solidification tail end by researching the low power of the continuous casting slab, and the method can optimize tail end electromagnetic stirring, soft reduction tool arrangement and a production process, so that the segregation problem of the continuous casting billet and a rolled material is solved.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a method for calculating the shell thickness of continuous casting rolls and the solidification end of a casting machine. Background technique [0002] Segregation, especially central segregation, is an important indicator for the quality evaluation of steel materials, especially special steel, and poor segregation control will seriously harm the performance of steel processed products. In order to improve the central segregation, the continuous casting machine is usually equipped with electromagnetic stirring at the end and light reduction equipment. However, it usually takes a long time for many iron and steel enterprises to debug these equipments, and some have not found a suitable process for many years. The improvement of segregation cannot be achieved. to the expected effect. The reason is mainly that the position of the solidification end or the thickne...

AI Technical Summary

Problems solved by technology

[0003] There are also many difficulties in using mathematical models. The modeling process from scratch requires a team of talents who are not only proficient in continuous casting and solidification expertise, but also have proficient programming capabilities. The programming process usually takes several years; Whether the model is suitable for the current casting machine (square, round, plate type, specifications, etc.) and whether the physical parameters are appropriate; whether the grid division representing the calculation accuracy is sufficient, if it is too dense, the calculation speed will be too slow, and if it is too sparse, the calculation will not be accurate enough ; Whether the setting of boundary conditions is appropriate, environmental factors may affect the value of some physical parameters, which may affect the accuracy of the calculation results and the adaptability of the calculation process to the site

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