High-temperature boxing method with liquid core for large extra-thick slab

A technology of extra-thick slab and high-temperature zone, which is applied in the field of high-temperature zone liquid core boxing, can solve problems such as cracks, macro-segregation, shrinkage porosity, etc., and achieve the goals of prolonging service life, eliminating shrinkage cavity and porosity, and eliminating thermal cracks Effect

Active Publication Date: 2015-08-12
中科西王特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-temperature boxing method with liquid core for large extra-thick slab

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Embodiment 1

[0032] This embodiment uses the process of the present invention to produce a large extra-thick slab with an external dimension of about 650×2500×3400mm and a unit weight of about 40 tons (t). The specific process is as follows:

[0033] The material of the large extra-thick slab is 16Mn. When molten steel is poured into the metal mold cavity for 1 hour, the solidified shell thickness of the large extra-thick slab is 100mm, and the shell thickness accounts for about 15% of the thickness of the large extra-thick slab. The thickness of the unsolidified area is 450mm. 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 boxing at high temperature, an insulation cover is added to the outer surface of the large extra-thick slab to slowly cool the large extra-thick slab, and the temperature of the outer surface of the large extra-thick slab is monitored. The cooling rate is about 8℃ / h to reach the...

Embodiment 2

[0036] This embodiment uses the process of the present invention to produce a large extra-thick slab with an external dimension of about 1000×2700×3300mm and a unit weight of about 60 tons (t). The specific process is as follows:

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

[0038]...

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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 a large extra-thick slab, and more particularly, the present invention relates to a high-temperature boxing method with a liquid core for a large extra-thick slab. Background technique [0002] With the development of the national economy, the amount of wide and heavy plates is increasing day by day. Ocean platforms, pipeline steel, ship steel, etc. all require a large number of wide and heavy plates, and the quality of the required wide and heavy plates is constantly improving. [0003] To ensure the quality of wide and heavy plates, it is difficult to complete rolling by a rolling mill alone. It is necessary to improve the quality of large and extra-thick slabs used for rolling of wide and thick plates. 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 ha...

Claims

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Application Information

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Patent Type & Authority Patents(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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