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Medium and low temperature boxing method for large extra-thick slabs

An ultra-thick slab and large-scale technology, which is applied in the field of medium and low temperature boxing of large-scale ultra-thick slabs, can solve the problems of shrinkage porosity, cracks, macro-segregation, etc. The effect of mass production

Active Publication Date: 2015-10-14
中科西王特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a medium and low temperature boxing method for large extra-thick slabs, improve the production efficiency of wide and thick slabs, and solve the problems of shrinkage porosity, macro segregation and cracks in wide and thick slabs

Method used

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  • Medium and low temperature boxing method for large extra-thick slabs

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Embodiment

[0027] In this embodiment, a wide and thick slab with an overall size of 1000×2700×3300mm and a unit weight of 60t is produced by adopting the process described in the present invention. The specific process is as follows:

[0028] The material of the wide and thick slab is EH36. When the molten steel is poured into the cavity of the metal mold for 1 hour, the outer surface of the metal mold of the wide and thick slab is forced to be cooled by intermittent blowing. The surface temperature is maintained between 80 and 120°C. The wide and thick slab is completely solidified after 4 hours, and the blowing cooling of the metal mold is stopped. The wide and thick slab continues to cool down in the mold. When the temperature of the outer surface of the slab drops to 600°C, the box is opened, and the wide and thick slab is released from the metal mold. The billet is cooled slowly, and the cooling rate is controlled at 40-80°C / h.

[0029] The wide and thick slab produced in this emb...

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Abstract

The invention discloses a method used for medium and low temperature mold dismantling of a large-scale extra-thick plant blank. The method comprises the following steps of: pouring molten steel into a large-scale extra-thick plate blank mould cavity; carrying out air-blowing or spray cooling for a large-scale extra-thick plate blank metal mould to enable the large-scale extra-thick plate blank to be solidified completely; carrying out the medium and low temperature mold dismantling; and keeping the temperature of the large-scale extra-thick plate blank and cooling the plate blank slowly. The method used for the medium and low temperature mold dismantling of the large-scale extra-thick plant blank, disclosed by the invention, removes shrinkage cavities and unconsolidated defects inside the large-scale extra-thick plate blank and hot cracks on the outer surface of the large-scale extra-thick plate blank.

Description

technical field [0001] The present invention relates to a method for manufacturing large extra-thick slabs, and more particularly, the present invention relates to a method for boxing large extra-thick slabs at medium and low temperatures. Background technique [0002] Wide and heavy plate rolling mills represent a country’s level of steel development. The United States had wide and heavy plate rolling mills in the 1940s. Japan’s wide and heavy plate rolling mills have a maximum opening of 1500mm and can roll thick plates over 500mm. In recent years, my country has also started to build wide and heavy plate rolling production lines, especially in the 21st century, my country has put into operation a number of 5000mm / 5500mm wide and heavy plate rolling production lines, including Baosteel, Anshan Iron and Steel, Wuyang Steel Works and other enterprises have built wide and heavy plate rolling production lines. With the development of the national economy and national defense c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/04B22D30/00B22D29/04
Inventor 栾义坤傅排先刘宏伟康秀红夏立军李殿中李依依
Owner 中科西王特钢有限公司
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