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Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel

A thin slab continuous casting and ladle furnace technology, applied in the field of refining outside the steelmaking furnace, can solve the problems of furnace machine mismatch, long heating time, and large lime consumption, so as to shorten heating time, reduce power consumption, and reduce lime consumption Effect

Inactive Publication Date: 2017-02-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of long refining period in the existing refining process, which affects the production rhythm and causes mismatch between furnaces and machines, and also has problems such as low desulfurization efficiency, long heating time, excessive lime consumption, and high production cost.

Method used

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  • Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel
  • Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel
  • Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel

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Embodiment 1

[0021] Example 1: 80 ton ladle furnace

[0022] The ladle furnace high-efficiency refining method based on thin slab continuous casting and rolling to produce high-strength steel includes five stages: converter tapping, argon station rapid oxygenation and aluminum addition, ladle furnace slagging, ladle furnace heating and continuous casting, among which,

[0023] 1) Converter tapping stage: Converter tapping temperature is controlled at 1685°C-1695°C; slag washing process is used in the tapping process to form primary refining slag: high-aluminum iron and silicon-manganese alloys are used for full deoxidation in tapping, and lime is added during the tapping process 350-450kg / furnace, refining slag 80kg / furnace, basically forming primary refining slag.

[0024] 2) Fast oxygen-fixed aluminum addition stage at the argon station: blow argon for more than 5 minutes at the argon station, feed the aluminum wire with constant oxygen at the argon station, the oxygen content w (O) in t...

Embodiment 2150

[0030] Example 2 150 ton ladle furnace

[0031] The ladle furnace high-efficiency refining method based on thin slab continuous casting and rolling to produce high-strength steel includes five stages: converter tapping, argon station rapid oxygenation and aluminum addition, ladle furnace slagging, ladle furnace heating and continuous casting, among which,

[0032] 1) BOF tapping stage: BOF tapping temperature is 1680°C-1690°C; tapping adopts slag washing process to form primary refining slag. High-aluminum iron and silicon-manganese alloys are used to fully deoxidize the steel when tapping. During the process, 600-800kg of lime is added per furnace, and 150kg of refining slag is added per furnace to basically form primary refining slag.

[0033] 2) Fast oxygen-fixed aluminum addition stage at the argon station: argon blowing at the argon station for more than 5 minutes, feeding the aluminum wire with constant oxygen at the argon station, the oxygen content w(O) in the steel is...

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Abstract

The invention discloses an efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel. The efficient ladle furnace refining method is characterized in that in a converter tapping stage, the converter tapping temperature ranges from 1,680 DEG C to 1,700 DEG C; quick oxygen probing is performed on molten steel in an argon station, and the addition of aluminum is determined according to the oxygen content; the ingredients and the alkalinity of an appropriate slag system are determined in the ladle furnace slagging stage; in the ladle furnace heating stage, after molten steel arrives at a station, a lower electrode heats up the molten steel, the heating power is controlled in a segmented manner, crusting on the slag surface is realized in the earlier stage, and slugging is performed at low gear; and after melting of slag, the slag surface is uniformly coated, heating is performed at high gear, point heating is adopted in the later stage, and one-time heating is performed to reach the required temperature. The efficient ladle furnace refining method can shorten the refining cycle by about 5 min, and therefore, shortens the procedure period; the electrode heating time is averagely shortened by 1 min, so that the power consumption is reduced; and after adoption of the ingredients of the new slag system, the desulphurization efficiency is improved, and the lime consumption is reduced by 3 kg / ton steel.

Description

technical field [0001] The invention relates to the field of refining outside a steelmaking furnace, in particular to a ladle furnace high-efficiency refining method for producing high-strength steel based on thin slab continuous casting and rolling. Background technique [0002] Ladle Furnace (Ladle Furnace referred to as LF furnace) is a secondary refining electric arc furnace heated by electric arc and stirred by argon gas. Steel mills are widely used. At present, deep desulfurization in the high-strength steel smelting process is generally completed by the refining process, and the refining cycle must match the cycle of the continuous casting machine. Therefore, it is required that the refining must quickly complete the tasks of desulfurization, deoxidation, and removal of inclusions. To achieve this goal The smelting efficiency of the ladle furnace must be improved. [0003] The steelmaking and smelting process route of high-strength steel in a CSP plant is generally:...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/06
CPCC21C7/0075C21C7/06C21C7/064Y02P40/40
Inventor 刘志勇彭著刚齐江华陶文哲陈吉清黄大伟
Owner 武汉钢铁有限公司
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