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High-efficiency fluorine-free desulfurization refining slag system for low-carbon aluminum-killed steel

A low-carbon aluminum-killed steel and slag refining technology, applied in the field of steelmaking, can solve the problems of shortening the service life of the ladle, accelerating the erosion of the ladle lining, harmful to human health, etc., and achieves the effect of reducing the amount of slag, improving the desulfurization effect, and reducing consumption.

Inactive Publication Date: 2011-12-28
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology

CaF 2 The use of will produce the following adverse effects: 1) slag CaF 2 The presence of CaF will accelerate the erosion of the ladle lining and shorten the service life of the ladle; 2) CaF 2 The fluorine volatilized at high temperature is discharged into the atmosphere, causing environmental pollution; 3) fluorine is a substance harmful to human health, CaF 2 The use of which can have a very adverse effect on the health of workers

Method used

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  • High-efficiency fluorine-free desulfurization refining slag system for low-carbon aluminum-killed steel
  • High-efficiency fluorine-free desulfurization refining slag system for low-carbon aluminum-killed steel
  • High-efficiency fluorine-free desulfurization refining slag system for low-carbon aluminum-killed steel

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Embodiment 1

[0036]Using the refining slag provided by the invention, experiments are carried out on the SPA-H steel type, with a ladle of 180 tons.

[0037] 1) Converter blowing end point [S]=0.0155%, [O]=990ppm, temperature T=1636°C. Converter tapping strictly prevents slag, adding 400kg of aluminum particles and 610kg of lime during tapping, and adding 30kg of aluminum particles on the slag surface at the end of tapping.

[0038] 2) When LF arrives at the station, 445kg of lime is added at one time, and the slag is completed within about 5 minutes. After slag melting, LF1 molten steel samples were taken, [S]=0.0054%, [Als]=0.0529% in molten steel. The flow rate of bottom blowing gas in ladle is 800N1 / min*2 during slag melting, and the flow rate of bottom blowing gas in heating stage is 350Nl / min*2. After refining for 15 minutes, [S]=0.0024% and [Als]=0.041% in molten steel. At the end of refining, molten steel [S]=0.001%, [Als]=0.041%, temperature T=1580°C. Refining time is 40min, a...

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Abstract

The invention discloses a fluorine-free high-efficiency desulfurization refining slag system for low-carbon aluminum-killed steel. The basic slag of the refining slag system is CaO-SiO2-Al2O3, and the weight percentages of each component in the basic slag are respectively: 57.4-61.8% CaO, 5-10% SiO2, 29.5-36% Al2O3; and, the basicity R of the refining slag system is 5.8-11.5, the Mannesmann index MI is 0.2-0.4, and the C / A is 1.6- 2.1, the saturation index of CaO is 0.9-1.0, the slag factor is ≤0.5, and the melting point is ≤1550°C. While reducing slag amount and production cost, the present invention can stably control the sulfur content in molten steel at the end point of LF refining below 20ppm, the desulfurization rate can reach over 80%, and effectively reduce production cost.

Description

technical field [0001] The invention particularly relates to a fluorine-free high-efficiency desulfurization refining slag system for low-carbon aluminum-killed steel (LCAK steel), which belongs to the technical field of steelmaking. Background technique [0002] As we all know, for most steel types, sulfur in steel is a harmful impurity element. The S element in the steel is easy to cause "hot embrittlement" and affect the performance of the steel. Therefore, it is necessary to remove the S element in the steel as much as possible to improve the performance of the steel. Some high-quality steel grades, such as hydrogen-induced cracking (HIC) pipeline steel, offshore platform steel and high-end pressure vessel steel, require extremely low sulfur content in steel. For hydrogen-induced cracking-resistant steel, the higher the sulfur content in the steel, the weaker the ability to resist hydrogen-induced cracking. Therefore, the sulfur content in hydrogen-induced cracking-res...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 邹长东夏奇周彦召刘飞丁振涛皇祝平
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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