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Straight-through submersed nozzle and preparation method thereof

An immersion and straight-through technology, applied in the field of iron and steel metallurgy, can solve problems such as unfavorable quality control, changes in the depth of molten steel reflow, and longitudinal cracks on the surface of slabs

Pending Publication Date: 2020-10-20
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of adjusting the slag line position by adjusting the insertion depth of the submerged nozzle improves the life of the submerged nozzle, the change in the insertion depth of the submerged nozzle will cause changes in the molten steel flow field in the mold, resulting in Changes in the reflow depth have a great impact on the melting rate of the mold slag and the fluctuation of the molten steel level in the mold, which is likely to cause longitudinal cracks on the surface of the slab, which is not conducive to quality control

Method used

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  • Straight-through submersed nozzle and preparation method thereof
  • Straight-through submersed nozzle and preparation method thereof
  • Straight-through submersed nozzle and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 with figure 2 As shown, a straight-through type submerged nozzle, the nozzle includes a main nozzle and a sub-nozzle; Between the cavity 8 composition;

[0038] In the cavity 8, an upper limit step 3 is set on the surface of the outer wall 4, and a lower limit step 10 is set on the surface of the inner wall; the top 6-1 of the sub-nozzle is provided with a protrusion 11 that cooperates with the upper limit step 3; A limit platform 12 matching with the lower limit step 10 is provided; the sub-nozzle 6 is accommodated in the cavity 8, can slide in the cavity and partially protrude from the cavity.

[0039] In the present invention, the cavity is cylindrical, and its cross section is circular. The upper limit step and the lower limit step divide the cavity into an upper cavity and a lower cavity, and when the sub-nozzle is in the cavity, the upper cavity and the lower cavity communicate with each other. The length of the sub nozzle is less than the le...

Embodiment 2

[0054] Compared with the manufacturing process of the conventional submerged nozzle, the manufacturing process of the straight-through submerged nozzle provided by this embodiment and capable of adapting to the slag changing line operation lies in the following steps:

[0055] Such as Figure 3-4 As shown, in the process of making the sub-nozzle, a sub-nozzle mold 9 is put into the manufacturing mold of the sub-nozzle as a part of the raw material for making the sub-nozzle. The dimensions and shape of the outer surface of the cavity 8 are exactly the same, the dimensions and shape of the inner surface of the sub-nozzle mold 9 are exactly the same as the dimensions and shape of the outer surface of the sub-nozzle 6, and the interior of the sub-nozzle mold 9 is pressed into aluminum carbon capable of forming the sub-nozzle 6 quality refractory material, after the submerged nozzle is manufactured, the sub-nozzle mold 9 remains in the nozzle, the material of the upper part of the ...

Embodiment 3

[0057] Compared with Example 1, this example provides specific dimensions of the specific submerged nozzle:

[0058] The length of the circular tubular cavity 8 is 200mm, the length of the upper cavity 8-1 is 100mm, the thickness of the upper cavity 8-1 is 18mm, the thickness of the outer wall 4 of the upper cavity 8-1 is 20mm, and the inner wall of the upper cavity 8-1 5 has a thickness of 15mm.

[0059] The length of the lower cavity 8-2 is 100mm, the thickness of the lower cavity 8-2 is 20mm, the thickness of the outer wall 4 at the lower cavity 8-2 is 23mm, and the thickness of the inner wall 5 at the lower cavity 8-2 is 10mm;

[0060] The sub-nozzle 6 is 10mm shorter than the length of the cavity 8, and there is a gap of 2-8mm between the sub-nozzle 6 and the cavity 8.

[0061] The horizontal length of the top 6-1 of the sub-nozzle is 20mm, and the longitudinal thickness of the top 6-1 of the sub-nozzle is 14mm;

[0062] The length of the upper part 6-2 of the sub-nozzl...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a straight-through submersed nozzle and a preparation method thereof. The straight-through submersed comprises a female nozzle and a sub nozzle; the female nozzle is divided into an upper part and a lower part, the structure of the lower part of the female nozzle consists of an outer wall, an inner walland a cavity between the outer wall and the inner wall; in the cavity, an upper limiting step is arranged on the surface of the outer wall, a lower limiting step is arranged on the surface of the inner wall; a bulge matched with the upper limiting step is arranged at the top of the sub-nozzle; a limiting table matched with the lower limiting step is arranged in the middle of the sub-nozzle; and the sub-nozzle is accommodated in the cavity, can slide in the cavity and partially extends out of the cavity. By the adoption of the straight-through submersed nozzle, slag line changing operation does not affect the depth of the sub-nozzle inserted into molten steel, a molten steel flow field in a crystallizer is not changed, negative influences on the quality of a casting blank are avoided, theservice life of the submersed nozzle is prolonged, and the quality of the casting blank is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular, the invention relates to a straight-through submerged nozzle which can adapt to the operation of the slag changing line. Background technique [0002] The straight-through submerged nozzle is a refractory casing installed at the bottom of the tundish and inserted below the molten steel surface of the mold, and plays the role of a steel flow channel between the tundish and the mold. It is mainly used for billets or rectangular billets. Protection during casting. [0003] Since the submerged nozzle is inserted below the molten steel surface of the mold, there is mold powder on the surface of the molten steel surface, so the mold powder will erode the outer surface of the submerged nozzle, and the submerged nozzle is gradually eroded and thinned, or even broken, resulting in The service life of the submerged nozzle ends early. The traditional method to improve the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/50B22D41/54
CPCB22D41/50B22D41/54
Inventor 刘洪银韩迎雪吴僧张冠锋李晓峰王庆伟王鹏陈超王利
Owner SHANDONG IRON & STEEL CO LTD