LF (ladle furnace) refining technology of small-flow bottom-blown ladle

A small flow, ladle technology, applied in the field of iron and steel metallurgy, can solve the problems of molten steel cleanliness, temperature, composition not up to standard, long refining treatment time, unable to arrange repacking, etc., to avoid production accidents or quality accidents, refining treatment cycle Short, the effect of promoting the interface reaction of steel slag

Pending Publication Date: 2021-07-13
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current high-efficiency production environment, ladle bottom blowing flow rate is small, it is often impossible to arrange ladle replacement, the refining process takes a long time, and the cleanliness, temperature, composition and other indicators of molten steel do not meet the standards, etc., causing unplanned production accidents of casting machine interruption And quality accidents such as ingredients out of line

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steel ladle C05 in the third area of ​​Liuzhou Iron and Steel Smelting Co., Ltd. found that the bottom blowing flow rate of the ladle was small before the molten steel was tapped from the converter. The smelted steel type was SPHC-1R, and the process path was Ar-LF-CC. The process control steps are as follows:

[0026] 7#150T converter smelting steel type SPHC-1R, smelting number 21B700850, according to the requirements of the process card, adding electro-melted pre-slag, lime block and medium carbon ferromanganese when tapping, starting to add 1 / 4 of the tapping, and tapping 1 / 2, the material has been added, and the addition of aluminum alloy is not included in this feeding process;

[0027] After tapping, the argon station (Ar) only measures the temperature and takes samples, and then it is hoisted from the back of the furnace to the LF process;

[0028] Lift the ladle to the LF process, open the bottom blowing valve, and the flow meter shows that the flow rate ...

Embodiment 2

[0036] At the initial stage of receiving molten steel at the tapping position behind the furnace, the No. C20 ladle in the third smelting area found that the bottom blowing flow rate of the ladle was small. The smelting steel type was DC01-1R, and the process path was Ar-RH-LF-CC. Add corresponding alloys and materials in the tapping process and RH process according to the requirements of the process card. The process control steps are as follows:

[0037] 7#150T converter smelting steel type DC01-1R, smelting number 21B701154, according to the requirements of the process card, adding electro-melted pre-melted slag and lime blocks when tapping, starting to add 1 / 4 of the tapping, and 1 / 2 of the tapping, the materials has been added;

[0038] After the steel is tapped, after only temperature measurement and sampling at the argon station (Ar), it is hoisted from the rear of the furnace to the RH process for decarburization and alloying treatment, and 115kg of high-carbon ferrom...

Embodiment 3

[0047] The No. C16 ladle in the third area of ​​Liuzhou Iron and Steel Smelting Co., Ltd. found that the bottom blowing flow rate of the ladle was small after the steel position received the molten steel out of the furnace. The smelted steel type was SPHC-1R, and the process path was Ar-LF-CC. The process control steps are as follows:

[0048] 7#150T converter smelting steel type SPHC-1R, smelting number 21B700746, adding electro-melting pre-slag and aluminum when tapping, starting to add 1 / 4 of the tapping, and adding materials when tapping 1 / 2;

[0049] After tapping, the argon station (Ar) only measures the temperature and takes samples, and then it is hoisted from the back of the furnace to the LF process;

[0050] Lift the ladle to the LF process, open the bottom blowing valve, and the flow meter shows that the flow rate of the bottom blowing at this time is 14Nm 3 / h, which belongs to the bottom blowing with small flow rate. After the molten steel sample is taken into t...

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PUM

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Abstract

The invention discloses an LF (ladle furnace) refining technology of a small-flow bottom-blown ladle. The LF refining technology comprises the steps of: adding an alloy and a slag making material at 1 / 4-1 / 2 of converter tapping, and feeding an alloy wire and a pure calcium wire under the condition of small-flow bottom blowing. The method provided by the invention can reduce the refining time under the condition of small-flow bottom blowing and improve the quality of a finished product, and production accidents or quality accidents caused by unplanned interruption of a casting machine are avoided.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an LF refining technology of a small-flow bottom-blown ladle. Background technique [0002] Ladle bottom argon blowing is an important process in the LF refining process, which affects important indicators such as molten steel cleanliness, molten steel composition, temperature uniformity, and refining treatment cycle, and is directly related to whether the casting machine can successfully produce qualified high-quality billets. The environment of the ladle is harsh during use, and the permeable bricks for the bottom blowing of the ladle are easy to block, causing the flow rate of the bottom blowing argon to decrease, which is an unavoidable problem for all steel mills at present. In actual production, if the flow rate of ladle bottom blowing is small, if the production rhythm is slow, you can also consider reversing the ladle or prolonging the refining treatment...

Claims

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Application Information

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IPC IPC(8): C21C7/072C21C7/076C21C7/00
CPCC21C7/072C21C7/076C21C7/0006Y02P10/20
Inventor 陈友操韦军尤陆志坚杜国利华府
Owner LIUZHOU IRON & STEEL
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