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Crystallizer

A crystallizer and chamfering edge technology, which is applied in the field of mold copper tubes for efficient production of high-quality chamfered blanks, can solve the problems of restricted application, easy occurrence of breakouts or longitudinal cracks, etc., so as to improve production efficiency and reduce corner cracks , The effect of high speed production

Inactive Publication Date: 2016-06-15
SHAGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Invention patent CN202715798U discloses a mold copper tube for producing octagonal continuous casting slabs, which can better prevent cracks at the corners of square rectangular slabs, but because the chamfering method is too close to the center, casting slabs at high casting speeds The billet shell at the chamfered corners is thin when it exits the mold, and breakouts or longitudinal cracks are prone to occur, which restricts its application in the high-efficiency production of rectangular billets at high casting speeds

Method used

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Examples

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Embodiment 1

[0042] combine figure 1 As shown, this embodiment is applied to the crystallizer of a billet continuous casting machine in a steel factory. The height h of the inner cavity of the lower mouth of the copper tube of the mold is 142mm, the width s is 142mm, and the length of the mold is 1000mm. It is a tubular mold, and the mold The wall thickness of the copper pipe is t=12mm, and the taper is 4.0%. It mainly produces cord steel, prestressed steel strand high carbon steel, spring steel, etc.

[0043] Chamfering A begins at 27mm from the corner of side wall 3, and there are 2 chamfering sides. The included angle α between the chamfered sides 1 and 2 is also 150°, the lengths of the chamfered sides 1 and 2 are both 19.8 mm, and the intersecting angle α adopts a circular arc transition.

[0044] After the copper tube of the chamfering crystallizer is put on the line, the casting speed is 2.0-2.85m / min.

[0045] After adopting this embodiment, there is no crack at the corner of the...

Embodiment 2

[0047] combine figure 2 As shown, this embodiment is applied to the crystallizer of a rectangular bloom continuous casting machine in a steel factory. The height h of the inner cavity of the lower opening of the mold is 300mm, the width s is 390mm, and the length of the mold is 800mm. It is a tubular mold, and the mold copper The wall thickness of the tube is t=12mm, and the taper is 4.0%. It mainly produces cord steel, spring steel, bearing steel, high-strength cable steel, alloy tool steel, etc.

[0048] The chamfering starts at 35mm from the 4th corner of the side wall. There are 3 chamfering sides. The α angle between the chamfering side 1 and the side wall is 159.6°. The included angle α between corner side 3 and 1 and 2 is 155.4°, and the intersecting angle α adopts arc transition, such as Figure 5 As shown, the lengths of chamfered sides 1 and 2 are both 19mm, and the length of chamfered side 3 is 18mm.

[0049] After the copper pipe of the chamfering crystallizer i...

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Abstract

The present application discloses a crystallizer, the transition between the adjacent first side wall and the second side wall has a chamfer, and the chamfer includes at least two connected chamfer sides, and the adjacent chamfer sides The angle between them is an obtuse angle. The new crystallizer is suitable for continuous casting high-speed production, which can effectively reduce the phenomenon of uneven cooling of continuous casting slabs and corner overcooling, and prevent corner defects from occurring.

Description

technical field [0001] The invention relates to the field of billet continuous casting production, in particular to a crystallizer copper tube for efficiently producing high-quality chamfered billets. Background technique [0002] In the process of continuous casting of square or rectangular billets, accelerated cooling is required after the billet exits the mold to ensure stable production at high casting speeds. The modes of accelerated cooling include water spray cooling or air mist cooling. Far, and by the overlapping cooling of the two intersecting surfaces, the corner temperature is the lowest, and it is easy to produce corner cracks during the bending and straightening process. Although metallurgists have done a lot of research and improvement work on cooling uniformity, they still cannot Completely avoid the low temperature of the corner, and the corner cracks occur from time to time, especially when it is necessary to increase the cooling to reduce the segregation o...

Claims

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Application Information

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IPC IPC(8): B22D11/04
CPCB22D11/04
Inventor 聂文金
Owner SHAGANG GROUP
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