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Method for controlling width of ferrite stainless steel plate blank in continuous casting production
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A stainless steel and ferrite technology, applied in the field of slab continuous casting, can solve the problem that the slab width deviates from the target requirement
Inactive Publication Date: 2014-07-09
BAOSHAN IRON & STEEL CO LTD
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[0021] Due to the continuous casting of different heats in the continuous casting process, there are also differences in the content of component elements in different heats. If the element content in some heats deviates from the average level, it will affect the width change W caused by the expansion of the slab. Creep , so that the slab width deviates from the target requirement
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Embodiment 1
[0102] Taking ferritic stainless steel 409L as an example, establish a method to adjust the water volume in the secondary cooling zone 3 by changing the composition elements to ensure the constant width of the slab.
[0103] 1.1 Obtain the balance formula (4) of the slab width scale factor
[0104] Acquisition variables v, Ni eq / Cr eq , T, φ, W, Δθ, q 1 ,q 2 ,q 3 ,q 4 , as the input variable of the model, and the ratio f of the width of the lower opening of the crystallizer to the final width of the slab as the output variable, through data screening, 106 sets of data were finally selected for calculation.
[0105] The data collected is measured by field instruments and then sent to a computer system for storage. Then, according to the on-site process conditions and related theories, the data sets with incomplete values or wrong items are manually eliminated. The screening criteria for some data items are as follows: remove the data group whose casting speed v is low...
Embodiment 2
[0136] Taking ferritic stainless steel 430 as an example, a method to adjust the water volume in the secondary cooling zone 3 by changing the composition elements is established to ensure the constant width of the slab.
[0137] 2.1 Obtain the balance formula (4) of the slab width scale factor
[0138] Acquisition variables v, Ni eq / Cr eq , T, φ, W, Δθ, q 1 ,q 2 ,q 3 ,q 4 , as the input variable of the model, and the ratio f of the width of the lower opening of the crystallizer to the final width of the slab as the output variable, through data screening, 106 sets of data were finally selected for calculation.
[0140] PLS regression: v, Ni eq / Cr eq , T, φ, W, Δθ, q 1 ,q 2 ,q 3 ,q 4 ANOVA for f
[0141]
[0142]
[0143] Result 1: The p-value of the ratio f is 0.000, which is less than the...
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Abstract
The invention relates to a method for controlling width of a ferrite stainless steel plate blank in continuous casting production, which meets the performance characteristic of ferrite steel grade, and by researching the influence of the change of elements in molten steel in different furnaces on the width of the plate blank, cancels out the influence through a parameter. With the method provided by the invention, the width of the plate blank can be controlled conveniently and effectively, the plate blank meeting a preset product requirement can be produced, and the requirements of low error and stable and regular control can be met.
Description
technical field [0001] The invention belongs to the technical field of slab continuous casting, and in particular relates to a method for controlling the width of a ferritic stainless steel slab in continuous casting production. Background technique [0002] Continuous casting technology is a process in which molten steel is poured, condensed, and cut to obtain a slab. Such as figure 1 As shown, the most important part of this process is to pour one or more furnaces of molten steel into the crystallizer 3 continuously through the ladle 1 and the tundish 2, and cool it with water in the crystallizer 3 composed of four copper plates, so as to obtain a solid surrounding steel. The slab shell and the middle part are still cast slabs of molten steel. Then the cast slab is gradually solidified through the secondary cooling 4, and is pulled out of the continuous castingmachine body by the support and rotation of the rollers in the tension straightening device 5, and then cut int...
Claims
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