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Cooling method of square and round billet continuous casting billet during tundish replacement

A cooling method, a billet continuous casting technology, applied in the cooling field of square and round billet continuous casting billets, can solve the problems such as inapplicable secondary cooling, achieve good promotion and application prospects, slow down the cooling intensity, and reduce the casting billet cooling effect

Inactive Publication Date: 2013-06-19
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not suitable for the secondary cooling of small cross-section square and round slabs in the process of tundish replacement

Method used

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  • Cooling method of square and round billet continuous casting billet during tundish replacement
  • Cooling method of square and round billet continuous casting billet during tundish replacement
  • Cooling method of square and round billet continuous casting billet during tundish replacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment is used to illustrate the cooling method of the billet continuous casting cast slab in the tundish change process provided by the present invention.

[0038] The continuous casting section is 200mm×200mm, the steel material is 20CrMnTi gear steel before the package change, and the steel material is 45# steel after the package change. The chemical composition is shown in Table 1.

[0039] At the beginning of the tundish change, that is, after the crystallizer is shut down, the cooling water meter of the cooling system is switched to 1.2m / min before the shutdown of the 20CrMnTi steel, which corresponds to 80% of the cooling water volume of each zone in the secondary cooling section. Cooling for 1 minute (the amount of cooling water in each section of 20CrMnTi steel is determined by the pulling speed at the time. Depending on the pulling speed, the amount of cooling water in each zone also changes correspondingly. The specific cooling water amount in each zone co...

Embodiment 2

[0050] This embodiment is used to illustrate the cooling method of the billet continuous casting cast slab in the tundish change process provided by the present invention.

[0051] According to the method of Example 1, the billet continuous casting slab is cooled during the tundish change process. The difference is that the cooling water meter of the cooling system is switched to 20CrMnTi steel when the tundish change starts, that is, after the mold stops. The first 1.2m / min corresponds to 78% of the cooling water volume of each zone in the secondary cooling section of the drawing speed. Cool each zone in the secondary cooling section for 1.2 minutes. At this time, the water volume distribution of each spray cooling zone of the billet in the secondary cooling section is: The cooling water volume in the spray cooling zone is 89.82L / min, the cooling water volume in the second spray cooling zone is 22.86L / min, the cooling water volume in the third spray cooling zone is 12.76L / min, an...

Embodiment 3

[0054] This embodiment is used to illustrate the cooling method of the round billet continuous casting cast slab in the tundish replacement process provided by the present invention.

[0055] The continuous casting section is ￠200mm (the diameter of the section is 200mm), the pipe made of B steel before the change, and the pipe made of 37Mn2 steel after the change, the chemical composition is shown in Table 4.

[0056] At the beginning of the tundish change, that is, after the crystallizer is shut down, the cooling water meter of the cooling system is switched to 1.2m / min before the shutdown of the B steel, which corresponds to 82% of the cooling water volume of each zone in the secondary cooling section. Cooling for 0.8 minutes (the amount of cooling water in each section of B steel is determined by the pulling speed at the time. According to the different pulling speed, the cooling water amount in each zone also changes correspondingly. The specific cooling water amount in each zo...

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Abstract

The invention discloses a cooling method of square and round billet continuous casting billet during tundish replacement. The cooling method of square and round billet continuous casting billet during the tundish replacement comprises the following steps: during the tundish replacement, a crystallizer is stopped; continuous casting billets which are remained on a secondary cooling section are cooled for 0.5 to 1.5 minutes by using 75% to 85% cooling water of all zones of the secondary cooling section before the crystallizer is stopped; cooling is stopped until the tundish replacement is stopped, the crystallizer is started, and the continuous casting billets are cooled according to the cooling water required by steel grades after the tundish replacement. The cooling method of square and round billet continuous casting billet during the tundish replacement can effectively reduce casting billet cooling intensity during the tundisn replacement and avoid failing of the tundish replacement due to the fact that the casting billets are too cold on the secondary cooling section and pouring can not be achieved, and meanwhile, the cooling method of square and round billet continuous casting billet during the tundish replacement can ensure successful tundish replacement, and can be widely applied to the square and round billet arc-shaped continuous casting machine tundish replacement pouring field.

Description

Technical field [0001] The invention relates to a cooling method for continuous casting of square and round billets during the tundish exchange process. Background technique [0002] In the existing technology, when the tundish is shut down for replacement, the secondary cooling method during continuous casting of the curved continuous caster is generally to reduce the secondary cooling water volume to the minimum water volume, and this method is adopted for all sections of each section. Allow to cool. [0003] CN102179492A discloses a secondary cooling method for blooms during continuous casting tundish replacement. The method includes: when the tundish is changing, after the crystallizer is shut down, the large square tail billet of the sector-shaped section remaining outside the outlet below the crystallizer is disclosed. Secondary cooling, which is characterized in that: the large square tail billet of the fan-shaped section is sequentially cooled through five spray coo...

Claims

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Application Information

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IPC IPC(8): B22D11/22
Inventor 杨文中李桂军陈小勇黎建全李清春解明科
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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