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A crystallizer submerged nozzle for single-point unbalanced protective casting of shaped billets and its use method

A crystallizer and immersion technology, which is applied in the direction of casting molten material container, casting equipment, metal processing equipment, etc., can solve the problems of large impact depth, slab solidification and many defects of slab, so as to reduce the impact depth and slab Defect reduction, washout reduction effect

Active Publication Date: 2021-04-13
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that when the existing submerged nozzle is used for single-point protection casting of special-shaped billet, molten steel scours the crystallizer seriously, and the impact depth in the crystallizer is large, which affects the coagulation of the casting slab and has many defects in the casting slab. The invention provides a single-point special-shaped billet The submerged nozzle of the mold for point unbalanced protection casting, the submerged nozzle can reduce the flow rate of molten steel, reduce the impact depth of molten steel in the mold, and homogenize the flow field and temperature field during the single-point protection casting of the shaped billet. The wall surface of the crystallizer is scoured, the solidification of the billet is not affected, and the resulting product has fewer defects and high quality

Method used

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  • A crystallizer submerged nozzle for single-point unbalanced protective casting of shaped billets and its use method
  • A crystallizer submerged nozzle for single-point unbalanced protective casting of shaped billets and its use method
  • A crystallizer submerged nozzle for single-point unbalanced protective casting of shaped billets and its use method

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Experimental program
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Effect test

Embodiment 1

[0048] Please refer to Figure 1 to Figure 7 , a mold submerged nozzle for single-point unbalanced protection casting of special-shaped blanks in this embodiment includes a submerged nozzle body 1, and the submerged nozzle body 1 includes an equal-diameter section 2, a variable-diameter section 3, an equal-diameter section and a variable-diameter section. Diameter joint 4, equal diameter section free end 5 and variable diameter section free end 6; variable diameter section 3 is provided with through hole X7, through hole Y8 and through hole Z9; through hole Y8 includes through hole Y 1 10 and through-hole Y 2 11.

[0049] The cross-sectional shape of the inner side of the equal-diameter section 2 is circular, and the connection between the equal-diameter section 2 and the variable-diameter section 3 constitutes the submerged nozzle body 1. The internal cross-sectional shape of the free end of the section 2 is circular, and the internal cross-sectional shape of the free end 6...

Embodiment 2

[0075] The submerged nozzle structure and usage method of this embodiment are the same as those of Embodiment 1, the difference lies in further explaining the present invention and providing support for the present invention.

[0076] Such as figure 1 with figure 2 As shown, a mold submerged nozzle for single-point unbalanced protection casting of a profiled billet according to the present invention, the insertion point of the submerged nozzle is inside the flange 13 on one side of the profiled billet crystallizer, and the insertion depth is 100mm. The variable diameter section of the submerged nozzle The major axis of the internal section of the free end 6 is parallel to the narrow surface of the crystallizer, and the minor axis of the internal section of the free end 6 of the variable diameter section is perpendicular to the narrow surface of the crystallizer. The X direction is the long axis direction of the inner section of the free end 6 of the variable diameter section...

Embodiment 3

[0083] The submerged nozzle structure and usage method of this embodiment are the same as those of Embodiment 1, the difference lies in further explaining the present invention and providing support for the present invention.

[0084] against image 3 The special-shaped billet shown corresponds to the special-shaped billet crystallizer used in production. This embodiment provides a crystallizer submerged nozzle for single-point unbalanced protection casting of a special-shaped billet. The submerged nozzle is divided into two sections, namely equal-diameter section 2 and The length of variable diameter section 3 and equal diameter section 2 is 490mm, the thickness is 2mm, and the inner diameter is 30mm; the length of variable diameter section 3 is 210mm, the thickness is 3mm, the major axis of the free end is 75mm, and the minor axis of the free end is 37.5mm .

[0085] There are 10 holes in the variable diameter section 3, 2 holes in the X direction, located on both sides of ...

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Abstract

The invention discloses a crystallizer submerged nozzle for single-point unbalanced protective casting of special-shaped billets and a use method thereof, belonging to the technical field of continuous casting of special-shaped billets. The nozzle includes an equal-diameter section and a variable-diameter section. The inner cross-section of the equal-diameter section is circular, and the equal-diameter section and the variable-diameter section are connected to form a submerged nozzle body. , the inner section of the free end of the variable diameter section is elliptical, and the variable diameter section is provided with through holes X, through holes Y and through holes Z along the X direction, Y direction and Z direction respectively. The present invention can reduce the flow rate of molten steel, reduce the impact depth of molten steel in the crystallizer, and homogenize the flow field and temperature field during the single-point protective casting of the profiled billet. The obtained product has few defects and high quality, and has the advantages of simple structure, convenient use method and easy implementation.

Description

technical field [0001] The invention relates to the technical field of continuous casting of shaped billets, more specifically, to a submerged nozzle of a crystallizer for single-point unbalanced protection casting of shaped billets and a use method thereof. Background technique [0002] Continuous casting of steel is the process of continuously cooling molten steel with a certain degree of superheat through a water-cooled crystallizer into a solid casting billet with a certain shape. During this process, a casing made of refractory material is required to inject molten steel from the tundish. In the crystallizer, this refractory sleeve is called a submerged nozzle. The submerged nozzle is installed on the bottom plate of the tundish and inserted below the liquid surface of the mold. Its main function is to prevent secondary oxidation, nitriding, and splashing of molten steel, and at the same time avoid slag entrainment on the liquid surface, and adjust the flow pattern and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/50
CPCB22D41/50
Inventor 李四军王中学何飞彭永香杜金科韩蕾蕾郭达周俐常立忠王海军陈庆
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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