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High-efficiency method for clearing surface defect of continuous casting plate slab

A technology for continuous casting steel and slab, which is applied in the field of efficient cleaning of surface defects of continuous casting steel slabs, can solve the problems of large surface cleaning area of ​​steel billets, affecting production operation rate, and high labor intensity of workers, so as to improve production efficiency and be easy to operate. , the effect of reducing labor intensity

Inactive Publication Date: 2009-04-08
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For edge cracking of the steel plate, the upper and lower surface corners of the billet are generally cleaned with artificial flames. The disadvantage of this method is that the surface of the billet is cleaned and the labor intensity is high. In addition, mechanical turnover is required, and the production site must be increased, which affects production. operating rate

Method used

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  • High-efficiency method for clearing surface defect of continuous casting plate slab
  • High-efficiency method for clearing surface defect of continuous casting plate slab
  • High-efficiency method for clearing surface defect of continuous casting plate slab

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Effect test

Embodiment 1

[0044] According to statistics, nearly 10,000 tons of continuous casting slabs, a total of 36 furnaces of steel, are used for hot rolling of low-alloy high-strength steel coils (slabs). The specifications of the continuous casting slab are 230-250mm (thickness) x 1300-2100mm (width) x 6500-9800mm (length). The specifications of the rolled steel coil (open flat plate) are 6-18mm (thickness) x 1200-2100mm (width) x 6000-16000mm (length).

[0045] Statistical results: There are 2700 tons of steel coils rolled without cleaning the surface of the continuous casting slab (open flat plate), 94 steel coils in total. According to statistics, there are 67 steel coils with edge cracks exceeding the standard, and the unqualified amount accounts for 71.27%.

[0046] The continuous casting slab is implemented according to the process of the present invention, totally 7300 tons, 262 steel coils, and the statistical results show that there are no edge cracks.

Embodiment 2

[0048] In November 2007, edge cracks occurred in 12 bridge steel plates rolled by the medium and heavy plate factory, which exceeded the shear width of the edge of the steel plates, resulting in non-standard steel plates that could not be delivered. Count 8 heats of co-casting steel with side cracks, a total of more than 2000 tons of continuous casting slabs, and then carry out artificial flame cleaning on the surface of these unrolled continuous casting slabs according to the process of the present invention. The production statistical results are shown in the following table.

[0049] Statistical results of uncleaned slab and edge cracks after slab cleaning

[0050]

[0051] The above embodiments prove that the present invention is accurate in cleaning the position of the continuous casting slab, and is completely suitable for steel mills to prevent and eliminate edge cracks in the steel plate.

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Abstract

The invention discloses a method for efficiently scarfing surface defects of a continuous casting sheet billet, which is characterized in that the flame scarfing is performed at upper and lower T / 4 positions along the thickness direction of both sides of the continuous casting sheet billet, the scarfing depth is between 2 and 8mm, the scarfing width is t, and the t needs to satisfy the following condition: the t is equal to 12.5+0.15 x T + / - 10mm, wherein the T is the thickness of the continuous casting sheet billet, and the unit is mm. The method overcomes the disadvantages that the prior method has large scarfing area, large labor intensity of workers and so on. The method has the advantages of accurate scarfing positions of the continuous casting sheet billet, small scarfing area, easy operation, high production efficiency and so on.

Description

technical field [0001] The invention relates to a method for efficiently cleaning surface defects of continuous casting steel slabs, which belongs to the technology of iron and steel materials. Background technique [0002] Edge cracking is a common defect in hot-rolled plate. In order to prevent and eliminate this defect, steel mills have done a lot of work in smelting and rolling. The existing defect cleaning methods are labor-intensive, take up a lot of time, and require large-scale mechanical cooperation, but the effect is not obvious. [0003] Edge crack defects are mainly longitudinal cracks, which generally appear in one furnace or several furnaces of continuous casting. Since the casting slab defects cannot be observed with the naked eye, after being rolled into steel plates (coils), continuous edge cracks will make the steel plates (coils) irreparable, seriously affecting the yield of the original steel plate and the contract fulfillment period, and serious econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/128B23K7/06
Inventor 董汉雄郭爱民李书瑞邹德辉董中波习天辉丁庆丰
Owner 武钢集团有限公司
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