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Continuous casting process and continuous casting machine for extra-thick plate blank

A technology of extra-thick slab and continuous casting process, which is applied in the field of extra-thick slab continuous casting, which can solve the problems of surface and internal quality defects, lack of bending and straightening equipment, and difficulty in ensuring the quality of casting slabs, so as to achieve good internal quality , Avoid overcooling or overheating pouring, solve the effect of center segregation

Inactive Publication Date: 2012-01-04
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for large extra-thick slabs with a thickness of 400-800 mm, due to the large size of the billet, the conventional straight arc casting machine does not have the corresponding bending and straightening equipment at present. The liquid

Method used

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  • Continuous casting process and continuous casting machine for extra-thick plate blank
  • Continuous casting process and continuous casting machine for extra-thick plate blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The continuous casting process of this embodiment is implemented to produce extra-thick slabs with a cross-sectional size of 2000×600 mm, and the variety is DH40 oil production platform steel. After the 100-200t molten steel comes out of the converter and is refined in the secondary refining furnace, the ladle containing the refined molten steel is transported to the rotary table, and after the rotary table is rotated to the pouring position, it is poured into the ladle 1, and the molten steel passes through the bottom of the ladle 1. The shroud is injected into the tundish 4 . The extra-thick slab continuous casting adopts a vertical casting machine, and the foundation pit of the casting machine is 25-40m deep. Due to the low casting speed of the extra-thick slab continuous casting, the tundish 4 is equipped with a continuous temperature measuring device 2 and a heating device 3 , control the superheat of molten steel in the tundish 4 to be stable at 10-30°C.

[0032]...

Embodiment 2

[0036] The continuous casting process of this embodiment is implemented to produce extra-thick slabs with a cross-sectional size of 2100×700 mm, and the variety is 16MnR container steel plates. After the 180-250t molten steel comes out of the converter and is refined in the secondary refining furnace, the ladle containing the refined molten steel is transported to the rotary table, and after the rotary table is rotated to the pouring position, it is poured into the ladle 1, and the molten steel passes through the bottom of the ladle 1. The shroud is injected into the tundish 4 . The continuous casting of extra-thick slab adopts a vertical casting machine. The foundation pit of the casting machine is 25-40m deep. Due to the low casting speed of continuous casting of extra-thick slab, a continuous temperature measuring device 2 and a heating device 3 are installed in the tundish. Control the superheat of molten steel in the tundish at 10-30°C.

[0037] After the submerged nozzl...

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Abstract

The invention relates to a continuous casting process and a continuous casting machine for an extra-thick plate blank. A continuous casting method and a vertical casting machine are used for producing the extra-thick plate blank, the problem that a casting blank is too thick to be bent and straightened is solved, production flow is shortened, production efficiency is improved and production cost is reduced; and simultaneously, with the vertical casting machine, the casting blank has no bent and straightened deformations, upward flotation of nonmetallic impurities in molten steel is facilitated, and the cleanness of the casting blank is improved; a continuous temperature measuring device and a tundish heating device are both arranged in a tundish, so that a superheat degree of the molten steel in the tundish can be steadily controlled at 10-30 DEG C, and super-cooled or super-heated casting under a condition of low casting speed is avoided; a soft reduction process is executed on a solidified tail end of the casting blank and a dummy bar, so that the problems of center segregation and center porosity in the casting blank are solved; a vertical cutting mode and an oblique pulling ejection mode are used, so that reliable output and feeding of the casting blank and the dummy bar are guaranteed.

Description

technical field [0001] The invention relates to the technical field of continuous casting of extra-thick slabs, in particular to a continuous casting process and a continuous casting machine for extra-thick slabs with a thickness of more than 400 mm. Background technique [0002] With the increasing demand for thick plates and extra thick plates in the market, thick plates and extra thick plates have been widely used in shipbuilding, pressure vessels, boilers, offshore drilling platforms, oil and gas pipelines, nuclear power plants, large bridges, Mold and other fields. At present, the production of thick plate and extra thick plate blanks mainly adopts die casting method. For example, for steel plates over 100mm, large steel ingots are basically used as raw materials, and the production method of secondary firing is adopted to ensure that the steel plates obtain sufficient compression ratios. However, due to the natural cooling of steel ingots in the production of die cas...

Claims

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Application Information

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IPC IPC(8): B22D11/04B22D11/126B22D11/12
Inventor 幸伟马春武徐永斌邵远敬叶理德李智杜斌卢志文
Owner WISDRI ENG & RES INC LTD
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