CN210080678U

CN210080678U - Small square billet tubular crystallizer capable of effectively reducing stripping

Info

Publication number: CN210080678U
Application number: CN201920007898.3U
Authority: CN
Inventors: 檀伟峰; 蒋毅; 刘强; 怀善春; 刘敬军; 赵恒�; 吴德亭; 陈朝
Original assignee: Shandong Laigang Yongfeng Steel and Iron Co Ltd
Current assignee: Shandong Laigang Yongfeng Steel and Iron Co Ltd
Priority date: 2019-01-03
Filing date: 2019-01-03
Publication date: 2020-02-18
Anticipated expiration: 2029-01-03

Abstract

The utility model discloses a small square billet tube type crystallizer which can effectively reduce the stripping, comprising 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. The utility model discloses a small square billet tubular crystallizer which can effectively reduce the stripping; in the actual production process, under the same process conditions, the quality of the casting blank is greatly improved, and the stripping rate of the casting blank is reduced from 0.09% to 0.028%.

Description

Small square billet tubular crystallizer capable of effectively reducing stripping

Technical Field

The utility model relates to a crystallizer, concretely relates to effectively reduce little square billet tubular crystallizer of side of taking off belongs to crystallizer technical field.

Background

With the rapid development of steel technology in China, the continuous casting technology also advances towards the high-efficiency trend, and the key technology of the high-efficiency continuous casting is to form a billet shell with certain thickness and strength in a short time when high-temperature molten steel passes through an inner cavity of a crystallizer so as to resist the ferrostatic pressure and ensure the smooth running of continuous casting steel; the core of the high-efficiency continuous casting is a crystallizer, and the design and optimization of the taper curve of the inner cavity of the crystallizer are particularly outstanding; in order to adapt to the shrinkage deformation of a casting blank in a crystallizer and the thermal deformation of the crystallizer, an inner cavity of the crystallizer is tapered and is in a shape with a large upper part and a small lower part so as to reduce the thickness of an air gap, improve the cooling condition and improve the pulling speed and the product quality; the taper is too small, the air gap is large in thickness, heat transfer of a crystallizer is influenced, and the improvement of the throwing speed is restricted; the excessive taper has large blank drawing resistance, thus aggravating the abrasion of the crystallizer and even breaking the casting blank to cause a steel leakage accident; at the present stage, after the drawing speed is improved, the quality of a casting blank is obviously reduced, particularly, the stripping defects of a small square blank are obviously increased, the design of the taper curve of the inner cavity of the crystallizer copper pipe cannot meet the requirements of the existing process conditions, and the design of the taper curve of the crystallizer copper pipe needs to be redesigned aiming at the situation.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a small square billet tube type crystallizer which can effectively reduce the stripping, the taper curve of the inner cavity of the copper tube of the crystallizer is developed and designed, and the stripping of the casting blank of the small square billet is controlled; the problem of casting blank off-square is solved.

The utility model discloses a small square billet tubular crystallizer which can effectively reduce the stripping, comprising a cavity which is 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 position of the fifth taper section is 850-900 mm, and the taper range is 0.1-0.3%/m; in the practical application process, the casting blank square-off defects are obviously reduced under the same condition of the pulling speed, the casting blank square-off defects accord with the solidification shrinkage rule of molten steel in a crystallizer under the existing high pulling speed, the blank shell of the casting blank is in closer contact with a copper pipe, air gaps are reduced, the blank shell grows uniformly, and the quality problem of the casting blank square-off of a small square blank under the high pulling speed can be well solved.

In a preferred embodiment, the adjacent straight faces and the arc faces are transited by fillets.

As a preferred embodiment, the width and height of the cavity are 120 × 120 mm-165 × 165mm, the length of the cavity is 850-950 mm, an upper opening of the crystallizer is arranged at one end of the cavity close to the first taper section, and a lower opening of the crystallizer is arranged at one end of the cavity close to the fifth taper section.

Compared with the prior art, the utility model discloses a little square billet tubular crystallizer that effectively reduces and takes off the side; in the actual production process, under the same process conditions, the quality of the casting blank is greatly improved, and the stripping rate of the casting blank is reduced from 0.09% to 0.028%.

Drawings

Fig. 1 is a schematic view of the radial cross section structure of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention.

Detailed Description

Example 1:

the small square billet tubular crystallizer for effectively reducing the stripping as shown in figure 1 comprises a cavity 1 which is integrally made of two groups of opposite surfaces and has a square cross section; one group of opposite surfaces of the cavity 1 is a straight surface 2, the other opposite surface is an arc surface 3, and the straight surface 2 and the arc surface 3 comprise a first taper section 4, a second taper section 5, a third taper section 6, a fourth taper section 7 and a fifth taper section 8 which are integrally manufactured; the position of the first taper section 4 is 0-250 mm, and the taper range is 3.5-6.5%/m; the position of the second taper section 5 is 250-450 mm, and the taper range is 2.0-3.0)%/m; the position of the third taper section 6 is 450-650 mm, and the taper range is 1.0-1.5)%/m; the position of the fourth taper section 7 is 650-850 mm, and the taper range is 0.5-0.8%/m; the position of the fifth taper section 8 is 850-900 mm, and the taper range is 0.1-0.3%/m; in the practical application process, the casting blank square-off defects are obviously reduced under the same condition of the pulling speed, the casting blank square-off defects accord with the solidification shrinkage rule of molten steel in a crystallizer under the existing high pulling speed, the blank shell of the casting blank is in closer contact with a copper pipe, air gaps are reduced, the blank shell grows uniformly, and the quality problem of the casting blank square-off of a small square blank under the high pulling speed can be well solved.

In another embodiment, the adjacent straight surfaces 2 and the arc surfaces 3 are transited by fillets.

In another embodiment, the width and height of the cavity 1 are 120 × 120 mm-165 × 165mm, the length of the cavity 1 is 850-950 mm, an upper opening of the crystallizer is arranged at one end of the cavity 1 close to the first taper section 4, and a lower opening of the crystallizer is arranged at one end of the cavity 1 close to the fifth taper section 8.

The above-mentioned embodiment is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles of the present invention are included in the claims of the present invention.

Claims

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.