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Ladle refining slag and smelting method thereof

A technology of ladle refining and smelting methods, applied in the field of steelmaking, to achieve the effect of being beneficial to adsorption, ensuring desulfurization effect, and taking into account deoxidation ability

Pending Publication Date: 2021-10-22
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patent application only provides the composition of refining slag, slagging raw materials, etc., and does not explain the slagging method. In the actual steelmaking production process, the order of adding slagging raw materials, the refining time of molten steel, and the use of deoxidizing materials And the erosion of ladle refractory materials have a very significant impact on the composition of refining slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Use 100 tons of electric furnace + 120 tons of LF to smelt 20CrMnTiH gear steel, tap the steel in the electric furnace, control the tapping temperature at 1624°C, and start alloying when the tapping amount reaches 1 / 3, and the addition sequence is: pure aluminum block-silicon Iron-ferromanganese-ferrochromium-lime-pre-melted slag, the interval between adding alloy, lime and pre-melted slag needs to be 10-15 seconds. Double air brick ladles are used, and the argon flow rate of each ladle bottom blowing is controlled at 1000NL / min during tapping, and it is closed after a delay of 30 seconds after tapping.

[0022] Use magnesia carbon brick ladle, slag line brick MgO is 76.3%, apparent porosity is 3.5%, volume density is 2.96g / cm 3 , the cladding brick requires MgO to be 80.5%, the apparent porosity to be 4.05%, and the bulk density to be 3.03g / cm 3 .

[0023] The tapping capacity of the electric furnace is 105 tons. During the tapping process, the amount of lime adde...

Embodiment 2

[0027] 1) Use 50 tons of electric furnace + 60 tons of LF to smelt 42CrMoA bonded steel. The tapping temperature is controlled at 1612°C. When the tapping amount reaches 1 / 3, alloying begins. The adding sequence is: pure aluminum block - ferrosilicon - ferromanganese - Ferrochromium-ferromolybdenum-lime-pre-melted slag, when adding alloy, lime, and pre-melted slag, the interval between adding alloy, lime and pre-melted slag is 10 seconds. Use a single vent brick ladle, control the argon gas flow rate at the bottom of the ladle at 8000NL / min when tapping, and close it after a delay of 60 seconds after tapping.

[0028] Using magnesia carbon brick ladle, slag wire brick MgO is 76.2%, apparent porosity is 3.51%, bulk density is 2.96g / cm 3 , the cladding brick requires MgO to be 80.4%, the apparent porosity to be 4.04%, and the bulk density to be 3.03g / cm 3 .

[0029] During the tapping process, the amount of lime added is: 300kg, the amount of pre-slag added is: 300kg / ton of st...

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Abstract

The invention belongs to the technical field of steelmaking, and particularly relates to ladle refining slag and a smelting method thereof. The ladle refining slag comprises the following components, by weight, 6-8.5% of SiO2, 23-27.5% of Al2O3, 45-51% of CaO, 5-8% of MgO and less than or equal to 0.5% of T(Fe+Mn), and CaO / Al2O3 is controlled in a range of 1.5-1.9. According to the method, the alkalinity and the aluminum oxide content of the refining slag are reasonably controlled, the CaO / Al2O3 is controlled within the range of 1.5-1.9, the deoxidation capacity of a slag system is considered while the desulfurization effect is guaranteed, and adsorption of inclusions is facilitated.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular, the invention relates to a ladle refining slag and a smelting method thereof. Background technique [0002] With the continuous development of our country and the increasing requirements of users for steel quality, ladle refining furnace has developed rapidly as a means to improve the cleanliness of molten steel and steel quality, and has become an indispensable process in the short process of modern steel production. LF refining can achieve the purpose of desulfurization and deoxidation through a reasonable slagging process, and then effectively absorb the inclusions in the steel and control the shape of the inclusions. In addition, the foam slag formed by steelmaking can be used to submerge the arc to improve thermal efficiency and reduce Corrosion of refractory materials. Therefore, in the LF furnace refining process, the adoption of a reasonable slagging process plays a vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/06C21C5/52
CPCC21C7/076C21C7/06C21C7/0006C21C5/52Y02P10/20
Inventor 刘兵赵冠夫戈文英梁娜况兴宇王升魏兵兵
Owner SHANDONG IRON & STEEL CO LTD
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