Continuous-casting big round billet dissimilar steel mixed casting production method

A production method and technology for different steel grades, which are applied in the field of continuous casting of large round billets and mixed casting of different steel grades, can solve the problems of affecting the production rhythm of steel mills, difficult to guarantee product quality, difficult production organization, etc. The effect of improving the rate of continuous casting billet and reducing the length of scrap

Active Publication Date: 2018-01-09
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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  • Continuous-casting big round billet dissimilar steel mixed casting production method

Examples

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Effect test

Embodiment 1

[0031] Take two steels with a difference of 0.03% in carbon content and 0.02% in manganese content in a continuous caster with a Φ380 mm section as an example.

[0032] There was still 20t molten steel left in the previous batch 1-1, and the drawing speed was reduced to 0.48 m / min. After the ladle 1-1 of the previous heat is poured, the ladle 1-2 of the next heat is rotated to the casting position; the level of the molten steel of the ladle 1-1 of the previous heat in the middle ladle 2 is reduced to 380mm When the second batch of ladle 1-2 is poured, the ladle covering agent of middle package 2 is changed from low silicon ladle covering agent to ultra-low carbon ladle covering agent; the latter batch of ladle 1-2 molten steel When pouring is started, the casting billet of the mold 4 is now marked as being cut into the mixed casting billet 8 according to the fixed-length length; when the next batch of ladle 1-2 has been cast for 25t, the liquid level in the tundish 2 Keep 500mm~...

Embodiment 2

[0035] For example, two steel grades with a 0.4% difference in manganese content are produced on a Φ600 mm section of a continuous caster.

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

[0037] When the liquid level of the remaining steel in the first batch of ladle 1-1 in the middle package 2 is reduced to 350mm, the latter batch of ladle 1-2 will be poured;

[0038] When the last batch of ladle 1-2 has been cast for 25t, keep the molten steel level in the tundish 2 at 500mm~700mm, and increase the drawing speed to the maximum allowable drawing speed of 0.36m / min;

[0039] After the first batch of large ladle 1-2 was poured, and the mold slag of the mold 4 was changed from manganese steel mold slag to medium carbon steel mold slag when the tundish 2 was cast for 10 minutes.

[0040] The...

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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 continuous casting large round billets of different steel types, in particular to a production method of mixed casting of different steel types of continuous casting large round billets. Background technique [0002] Many special steel companies have a variety of product structures and most of them are special-purpose steels. Small orders often appear, which brings certain difficulties to the production organization. If a tundish only produces 1 to 2 furnaces of molten steel, the product quality is difficult to guarantee, and the subsequent slow change of the continuous casting tundish takes up to several hours, which will seriously affect the production rhythm of the steel plant and increase the production cost. [0003] Different steel grades with very different compositions are mixed and produced in the same tundish, which will inevitably produce mixing of molten steel. The composition of th...

Claims

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Application Information

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Patent Type & Authority Applications(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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