Method used for high-temperature liquid core mold dismantling of large-scale extra-thick plate blank

A technology of extra-thick slabs and high-temperature belts, applied in the field of high-temperature belt liquid core boxing, can solve the problems of macro-segregation, cracks, shrinkage porosity, etc. Effect

Active Publication Date: 2013-04-03
中科西王特钢有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a boxing and cooling process for large extra-thick slabs used in wide-thick plate rolling mills, improve the production efficiency of large extra-thick slabs, and solve the problems that large extra-thick slabs are prone to shrinkage porosity, macro segregation and cracks

Method used

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  • Method used for high-temperature liquid core mold dismantling of large-scale extra-thick plate blank

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Embodiment 1

[0032] In this embodiment, a large extra-thick slab with an overall size of about 650×2500×3400 mm and a single weight of about 40 tons (t) is produced by adopting the process described in the present invention. The specific process is as follows:

[0033] The material of the large extra-thick slab is 16Mn. When the molten steel is poured into the cavity of the metal mold for 1 hour, the thickness of the solidified shell of the large extra-thick slab is 100mm, and the thickness of the shell accounts for about 15% of the thickness of the large extra-thick slab. The thickness of the unsolidified area is 450 mm. At this time, high-temperature boxing is performed, and the outer surface temperature of the large extra-thick slab is as high as 1100 ° C. After high-temperature boxing, add an insulation cover to the outer surface of the large extra-thick slab to slowly cool the large extra-thick slab. Monitor the temperature of the outer surface of the large extra-thick slab. Freeze co...

Embodiment 2

[0036] In this embodiment, a large extra-thick slab with an external dimension of about 1000×2700×3300 mm and a unit weight of about 60 tons (t) is produced by adopting the process described in the present invention. The specific process is as follows:

[0037] The material of the large extra-thick slab is EH36. When molten steel is poured into the cavity of the metal mold for 2 hours, the thickness of the solidified shell of the large extra-thick slab is 200mm, and the thickness of the shell accounts for about 20% of the thickness of the large extra-thick slab. The thickness of the unsolidified area is 600mm. At this time, the high-temperature boxing is performed, and the outer surface temperature of the large extra-thick slab is as high as 1050°C. After high-temperature boxing, the outer surface of the large extra-thick slab is sprayed and forced to cool to monitor the temperature of the outer surface of the large extra-thick slab. The cooling rate is about 110°C / h until the ...

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Abstract

The invention discloses a method used for high-temperature liquid core mold dismantling of a large-scale extra-thick plate blank. The method is characterized by comprising the following steps of: pouring molten steel into a large-scale extra-thick plate blank mould cavity; performing high-temperature liquid core mold dismantling 0.5-3 hours after the pouring operation is finished; and cooling the large-scale extra-thick plate blank until the large-scale extra-thick plate blank is completely solidified. The method used for the high-temperature liquid core mold dismantling of the large-scale extra-thick plate 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 and extra-thick slabs, and more particularly, the present invention relates to a method for high-temperature boxing with liquid cores for large and extra-thick slabs. Background technique [0002] With the development of the national economy, the amount of wide and thick plates is increasing day by day. Ocean platforms, pipeline steel, and ship steel all require a large number of wide and thick plates, and the quality of the required wide and thick plates is also constantly improving. [0003] Guaranteeing the quality of wide and thick plates is difficult to complete by rolling alone. The quality of large and extra-thick slabs used for rolling wide and thick plates must be improved. The quality of large and extra-thick slabs is the fundamental guarantee for the quality of wide and thick plates. In order to improve the quality of large extra-thick slabs, some new technologies have been de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D30/00
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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