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Continuous casting method for producing non-magnetic steel on straight-arc-shaped continuous casting machine

A technology of non-magnetic steel and continuous casting machine, applied in the field of continuous casting process in the metallurgical industry, can solve the problems of difficult production of non-magnetic steel, broken steel billets, scrapping, etc. Yield, cost reduction effect

Inactive Publication Date: 2016-08-31
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The production of non-magnetic steel is very difficult, and the pouring process is prone to breakouts and large longitudinal cracks on the upper and lower surfaces of the slab, which may even cause scrapping in severe cases

Method used

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Embodiment Construction

[0016] Below in conjunction with embodiment the present invention is described in further detail.

[0017] The continuous casting method of producing non-magnetic steel on the straight arc continuous casting machine, the main operation is as follows

[0018] 1. The molten steel is desulfurized by KR stirring, the steel is tapped from a converter with a nominal volume of 120t, the refining temperature is raised and the chemical composition is qualified to ensure that the temperature of the molten steel is between 1460 and 1500 °C when the ladle is lifted.

[0019] 2. Hoist the ladle into the turret of continuous casting ladle:

[0020] (1) Adjust the billet specification range to 370mm* (1400-2600mm).

[0021] (2) Do a good job of sealing and starting the ingot.

[0022] (3) Use a large tundish to center the nozzle of the tundish.

[0023] (4) Add tundish covering agent and introduce mold powder.

[0024] (5) The typical casting speed is controlled at 0.30-0.6 m / min, and th...

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Abstract

The invention relates to a continuous casting method for producing non-magnetic steel on a straight-arc-shaped continuous casting machine. Molten steel is subjected to KR stirring desulphurization, nominal volume 120 t converter tapping and refining and temperature rising, molten steel chemical components are adjusted to be qualified, and the temperature of the molten steel ranges from 1460 DEG C to 1500 DEG C during ladle lifting; a large tundish is used, a dummy ingot is sealed, and a water gap of the tundish is centered; the molten steel is poured into the large tundish, a tundish covering agent is added, crystallizer protection slag is introduced, cold steel dropping, slag adding and slag changing operation is conducted on the molten steel level in a crystallizer, the typical drawing speed is set to range from 0.30 m / min to 0.6 m / min, and the typical overheat degree ranges from 20 DEG C to 60 DEG C; and a crystallizer expert system is used for controlling so as to avoid the steel leaking risk in the casting process, a dynamic secondary water cooling and dynamic soft reduction technology is adopted in the descending process for removing surface longitudinal cracks generated in the casting process, and the molten steel yield is increased in a two-converter molten steel casting manner.

Description

technical field [0001] The invention belongs to a continuous casting process in the metallurgical industry, in particular to a continuous casting method for producing non-magnetic steel on a straight arc continuous casting machine. Background technique [0002] Non-magnetic steel 20Mn23AlV is widely used in non-magnetic structural materials such as large and medium-sized transformers. Due to the high content of Mn and A1 in 20Mn23A1V, this steel type is mainly produced by die casting at home and abroad, but the surface quality of steel ingots produced by die casting is difficult to guarantee. At the same time, the molten steel Yield rate and steel rolling finished product rate are also low. There are no reports on domestic manufacturers using straight arc slab continuous casting, only a few use vertical continuous casting machines for casting. [0003] Due to its high Al content (1.5%~2.5%), the Al in the molten steel is easily absorbed by the SiO in the mold slag during th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/041
CPCB22D11/001B22D11/041
Inventor 谭建平陈玉辉徐国庆韩全军刘建清宋延成李忠平
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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