CN210080678U - A billet tube type crystallizer that can effectively reduce de-square - Google Patents

Abstract

The utility model discloses a small billet tubular crystallizer which can effectively reduce the square off. , the other opposite surface is an arc surface, and the straight surface and the arc surface include a first taper segment, a second taper segment, a third taper segment, a fourth taper segment and a fifth taper segment that are integrally made; the first taper segment The position of the segment is 0～250mm, the taper range is 3.5～6.5%/m; the position of the second taper segment is 250～450mm, the taper range is 2.0～3.0)%/m; the position of the third taper segment is 450～650mm, and the taper range is 1.0 ～1.5)%/m; the position of the fourth taper segment is 650～850mm, the taper range is 0.5～0.8%/m; the position of the fifth taper segment is 850～900mm, and the taper range is 0.1～0.3%/m. In the actual production process, under the same technological conditions, the quality of the cast slab is greatly improved, and the cast blank ratio is reduced from 0.09% to 0.028%.

Description

A billet tube type crystallizer that can effectively reduce de-square

technical field

The utility model relates to a crystallizer, in particular to a small billet tube type crystallizer which can effectively reduce stripping, belonging to the technical field of crystallizers.

Background technique

With the rapid development of China's iron and steel technology, continuous casting technology is also moving towards a trend of high efficiency. The key technology of high-efficiency continuous casting is to make the high-temperature molten steel pass through the inner cavity of the mold to form a shell with a certain thickness and strength. In order to resist the static pressure of molten steel and ensure the continuous running of the continuous casting steel; the core of high-efficiency continuous casting is the mold, and the design and optimization of the taper curve of the mold cavity is particularly prominent; in order to adapt to the shrinkage deformation and crystallization of the casting billet in the mold Due to the thermal deformation of the mold itself, the inner cavity of the mold is tapered, and the shape is large at the top and small at the bottom, so as to reduce the thickness of the air gap, improve the cooling conditions, and improve the pulling speed and product quality; Heat, which restricts the increase of the drawing speed; the excessive taper has a large drawing resistance, aggravates the wear of the mold, and even breaks the billet and causes a steel breakout accident; at this stage, after the drawing speed is increased, the quality of the billet decreases significantly, especially The billet de-square defect increases significantly, and the design of the inner cavity taper curve of the mold copper tube cannot meet the needs of the existing process conditions. In view of this situation, the taper curve of the mold copper tube needs to be redesigned.

Utility model content

In order to solve the above problems, the utility model proposes a small billet tube type mold that can effectively reduce the square billet, develops and designs the taper curve of the inner cavity of the copper tube of the mold, controls the small billet casting billet from square off; question.

The small billet tubular crystallizer of the utility model which can effectively reduce the square off comprises a cavity which is integrally made of two sets of opposing surfaces and has a square cross-section; one set of opposing surfaces of the cavity is straight, and the other The opposite surface is an arc surface, and the straight surface and the arc surface include a first taper segment, a second taper segment, a third taper segment, a fourth taper segment, and a fifth taper segment that are integrally made; the position of the first taper segment is 0～250mm, the taper range is 3.5～6.5%/m; the position of the second taper segment is 250～450mm, the taper range is 2.0～3.0)%/m; the position of the third taper segment is 450～650mm, the taper range is 1.0～1.5) %/m; the position of the fourth taper segment is 650～850mm, the taper range is 0.5～0.8%/m; the position of the fifth taper segment is 850～900mm, the taper range is 0.1～0.3%/m; in the actual application process, the pulling speed Under the same conditions, the cast-off defect of the billet is significantly reduced, which conforms to the existing law of solidification and shrinkage of molten steel in the mold under high drawing speed. Uniform growth can well solve the quality problem of billet de-square at high drawing speed.

As a preferred embodiment, a rounded corner transitions between the adjacent straight surfaces and the arcuate surfaces.

As a preferred embodiment, the width and height of the cavity are 120×120mm~165×165mm, the length of the cavity is 850~950mm, and one end of the cavity close to the first tapered section is the upper mouth of the crystallizer, so One end of the cavity close to the fifth tapered section is the lower mouth of the crystallizer.

Compared with the prior art, the utility model has the small billet tube type crystallizer which can effectively reduce the square billet; in the actual production process, under the same technological conditions, the quality of the casting billet is greatly improved, and the billet shedding is greatly improved. rate decreased from 0.09% to 0.028%.

Description of drawings

FIG. 1 is a schematic diagram of a radial cross-sectional structure of the present invention.

FIG. 2 is a schematic diagram of the overall structure of the present invention.

Detailed ways

Example 1:

As shown in Fig. 1, the billet tube type crystallizer that effectively reduces the square off includes a cavity 1 which is integrally made of two sets of opposing faces and has a square cross-section; the set of opposing faces of the cavity 1 is: The straight surface 2, the other opposite surface is the arc surface 3, the straight surface 2 and the arc surface 3 include the first tapered section 4, the second tapered section 5, the third tapered section 6, the fourth tapered section 7 and the first Five taper sections 8; the position of the first taper section 4 is 0-250mm, and the taper range is 3.5-6.5%/m; the position of the second taper section 5 is 250-450mm, and the taper range is 2.0-3.0)%/m; The 6th position of the three-taper section is 450~650mm, the taper range is 1.0~1.5)%/m; the 7th position of the fourth taper section is 650~850mm, and the taper range is 0.5~0.8%/m; The taper range is 0.1-0.3%/m; in the actual application process, under the same conditions of drawing speed, the cast-off defect of the slab is significantly reduced, which conforms to the existing law of solidification and shrinkage of molten steel in the mold at high drawing speed. The contact between the billet shell and the copper tube is tighter, the air gap is reduced, and the billet shell grows uniformly, which can well solve the quality problem of the billet de-square at high drawing speed.

In yet another embodiment, the adjacent straight surfaces 2 and the arc surfaces 3 are transitioned by rounded corners.

In yet another embodiment, the width and height of the cavity 1 are 120×120mm~165×165mm, the length of the cavity 1 is 850~950mm, and one end of the cavity 1 close to the first tapered section 4 is at the end of the crystallizer. The upper port, one end of the cavity 1 close to the fifth tapered section 8 is the lower port of the crystallizer.

The above-mentioned embodiments are only preferred embodiments of the present invention, so all equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention. Inside.

Claims (3)

1. The utility model provides an effective little square billet tubular crystallizer that reduces and takes off square which characterized in that: comprises a cavity which is integrally made of two groups of opposite surfaces and has a square cross section; one group of opposite surfaces of the cavity is a straight surface, the other opposite surface of the cavity is an arc surface, and the straight surface and the arc surface comprise a first taper section, a second taper section, a third taper section, a fourth taper section and a fifth taper section which are integrally manufactured; the first taper section is 0-250 mm in position, and the taper range is 3.5-6.5%/m; the position of the second taper section is 250-450 mm, and the taper range is 2.0-3.0)%/m; the third taper section is 450-650 mm in position, and the taper range is 1.0-1.5)%/m; the position of the fourth taper section is 650-850 mm, and the taper range is 0.5-0.8%/m; the fifth taper section is 850-900 mm in position, and the taper range is 0.1-0.3%/m.

2. The small square billet tube crystallizer for effectively reducing the stripping according to claim 1, which is characterized in that: and the adjacent straight surfaces and the arc surfaces are in round angle transition.

3. The small square billet tube crystallizer for effectively reducing the stripping according to claim 1, which is characterized in that: the width and the height of the cavity are 120 mm-165 mm, the length of the cavity is 850-950 mm, one end of the cavity, which is close to the first taper section, is an upper opening of the crystallizer, and one end of the cavity, which is close to the fifth taper section, is a lower opening of the crystallizer.

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