Production method of mixed casting of different steel types for continuous casting big round billet

A production method and a technology of different steel types, which are applied in the field of mixed casting of different steel types in continuous casting large round billets, can solve the problems of affecting the production rhythm of steel plants, difficulty in ensuring product quality, and difficulty in production organization, so as to reduce thermal shutdown time, The effect of increasing the billet rate of continuous casting billet and reducing the scrapped length

Active Publication Date: 2019-06-07
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Many special steel enterprises have many types of product structure and most of them are some special-purpose steels. Small batch orders often appear, which brings certain difficulties to production organization.
If a tundish only produces 1 to 2 heats of molten steel, the product quality is difficult to guarantee, and the slow change of the continuous casting tundish will take several hours, which will seriously affect the production rhythm of the steel plant and increase the production cost.

Method used

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  • Production method of mixed casting of different steel types for continuous casting big round billet

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take the production of two steel grades with a carbon content difference of 0.03% and a manganese content difference of 0.02% in a Φ380 mm section of a continuous casting machine as an example.

[0032] There was still 20t of molten steel remaining in ladle 1-1 of the previous heat, and the casting speed was reduced to 0.48 m / min. After pouring the molten steel from the previous heat ladle 1-1, rotate the subsequent heat ladle 1-2 to the casting position; the liquid steel level of the previous heat ladle 1-1 in the middle ladle 2 is lowered to 380mm At the time of pouring, the ladle 1-2 of the last heat was poured, and the ladle covering agent of the tundish 2 was replaced with an ultra-low carbon ladle covering agent; the molten steel of the ladle 1-2 of the last heat When pouring is started, the casting slab that comes out of the crystallizer 4 starts to be marked at this moment, and is cut into a mixed casting slab 8 according to a fixed length; after the last batch ...

Embodiment 2

[0035] Two steel grades with a manganese content difference of 0.4% are produced on a Φ600 mm section of a continuous casting machine as an example.

[0036] The control method of the mixed casting production process is basically the same as that of Example 1, the difference is that there is still 15 tons of molten steel left in the previous batch of ladle 1-1, and the casting speed is initially reduced to 0.30 m / min;

[0037] When the remaining steel liquid level of the previous heat ladle 1-1 in the tundish 2 drops to 350mm, the latter heat ladle 1-2 starts pouring;

[0038] After casting 25t of ladle 1-2 in the next furnace, keep the molten steel level in tundish 2 at 500mm~700mm, and increase the casting speed to the maximum casting speed allowed by the process of 0.36m / min;

[0039] After the pouring of ladle 1-2 in the last heat, when casting in tundish 2 for 10 minutes, replace the mold slag of mold 4 from manganese steel mold slag to medium carbon steel mold slag.

[...

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Abstract

The invention discloses a continuous-casting big round billet dissimilar steel mixed casting production method. The method comprises the following steps that when molten steel of a prior melt is casted into a medium ladle, a certain amount of molten steel is left in a big ladle of the melt, and the casting speed is decreased; when the molten steel, left in the medium ladle, of the prior melt is decreased to a certain liquid level, casting is started on a big ladle of molten steel of a later melt, and a steel ladle covering agent in the medium ladle is replaced; after the big ladle of the latermelt is cast for a certain time, covering slag of a crystallizer is replaced; after the big ladle of the later melt is cast for 25 t, the liquid level of the medium ladle is kept, and the casting speed is increased; after the big ladle of the later melt is cast for 30 t, the liquid level of the medium ladle is slowly increased to the normal full liquid level, and then casting is conducted; and after the big ladle of the later melt is cast for 40 t, the casting speed is decreased to that corresponding to normal superheat degree, and then normal casting is conducted. According to the continuous-casting big round billet dissimilar steel mixed casting production method, when dissimilar steel is produced in the same medium ladle in a continuous casting manner, the thermal shutdown time can beshortened, the production efficiency of a continuous casting machine can be met, and the continuous casting billet yield can be increased.

Description

technical field [0001] The invention relates to the field of mixed casting production of different steel types for continuous casting large round billets, in particular to a production method for mixed casting of different steel types for continuous casting large round billets. Background technique [0002] Many special steel enterprises have a wide variety of product structures and most of them are some special-purpose steels. Small batch orders often appear, which brings certain difficulties to production organization. If a tundish only produces 1 to 2 heats of molten steel, the product quality is difficult to guarantee, and the subsequent continuous casting tundish replacement takes as long as several hours, which seriously affects the production rhythm of the steel plant and increases the production cost. [0003] The mixed casting of different steel types with large composition differences in the same tundish will inevitably result in the mixing of molten steel. The pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18
Inventor 印传磊马建超郑力宁杨丽梅翟万里林鹏张洪才
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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