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Preparation method of steel billet of steel with deoxidized aluminum

A technology of aluminum deoxidation and steel billet, which is applied in the field of iron and steel metallurgy, can solve the problems of desulfurization, low deoxidation rate, and difficult control, and achieve the effects of reducing the content of non-metallic inclusions, improving cleanliness, and avoiding corrosion

Inactive Publication Date: 2018-01-23
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: using the existing desulfurization refining slag to desulfurize molten steel, the deoxidation rate is low, and it is not easy to control, etc.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0019] The invention provides a method for preparing an aluminum deoxidized steel slab, comprising the following steps:

[0020] Converter smelting molten steel-deoxidation alloying-molten steel refining-continuous casting to prepare steel slabs with T[O]0.0003-0.0005%; adding active lime and refining slag to molten steel for refining during the molten steel refining.

[0021] In the present invention, the alloyed molten steel is first mixed with active lime, and the heat of molten steel is used to promote the rapid melting of the active lime and float into the ladle slag, which can play the role of desulfurization, deoxidation, and removal of inclusions, and then add Refining slag can reduce the oxygen in ladle slag and optimize the composition of ladle slag to achieve the effect of purifying molten steel.

[0022] In the present invention, the lime structure is closely related to the calcination temperature and calcination time. Therefore, the structure affecting the lime ac...

Embodiment 1

[0033] Embodiment 1 adopts the method of the present invention to prepare aluminum deoxidized steel

[0034] The refining method of aluminum deoxidized steel (34CrMo4 steel), the specific operation steps are as follows:

[0035] (1) Converter smelting

[0036] During converter smelting, add 120 tons of molten iron into the converter for top and bottom re-blowing converter blowing, the blowing time is 15-30 minutes, the temperature at the end of blowing is 1660-1680 ° C, and the C content of molten steel at the end of blowing is ≥ 0.05 weight %; Sampling analysis, the S content at the end point of the converter is 0.007~0.016% by weight;

[0037] (2) Tapping

[0038]During the tapping process of the converter, add anthracite, aluminum iron, ferrochromium, ferromolybdenum, silicomanganese and ferromanganese alloys to carry out alloying of C, Si, Mn elements, and then add active lime (the activity degree is 300 ml) into the ladle with the steel flow. ), the addition amount is ...

Embodiment 2

[0047] Embodiment 2 adopts the method of the present invention to prepare aluminum deoxidized steel

[0048] The refining method of aluminum deoxidized steel (20CrMnTiH), the specific operation steps are as follows:

[0049] (1) Converter smelting

[0050] During converter smelting, add 120 tons of molten iron into the converter for top and bottom re-blowing converter blowing. The blowing time is 15 to 30 minutes, the blowing temperature is 1655 to 1690 ° C, and the blowing end point is that the C content of the molten steel is ≥ 0.05 weight %; Sampling analysis, the S content at the end of the converter is 0.016~0.068% by weight;

[0051] (2) Tapping

[0052] During the tapping process of the converter, anthracite, aluminum-iron, ferrosilicon and ferromanganese alloys are added for alloying of C, Si and Mn elements, and then active lime (activity degree is 500 ml) is added into the ladle with the steel flow, and the addition amount is 3.0 ~5.5 kg / ton of molten steel, pour ...

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Abstract

The invention relates to the steel and iron metallurgy field, in particular to a preparation method of a steel billet of steel with deoxidized aluminum. The invention provides the preparation method of the steel billet of the steel with the deoxidized aluminum in order to solve the problems that according to existing desulphurization refining slag, molten steel is low in desulphurization and deoxidation rate and control is difficult. The preparation method of the steel billet of the steel with the deoxidized aluminum includes the following steps of molten steel smelting of a converter, deoxidation alloying, molten steel refining and continuous casting, and the steel billet of T[O]0.0003-0.0005% is prepared; and during molten steel refining, active lime and refining slag are added into themolten steel to perform refining. According to the preparation method, the molten steel refining desulphurization rate can be ideally controlled between 25% and 85%, T[O] in continuous casting billetis controlled between 0.0003% and 0.0005%, not only can the molten steel desulphurization rate be increased, but also the nonmetal inclusion content in the steel can also be reduced, and the cleannessdegree of the molten steel is improved. Meanwhile, corrosion of fluorite to a refractory material and pollution of the fluorite to the environment are also avoided, and important significance is achieved.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for preparing an aluminum deoxidized steel slab. Background technique [0002] With the development of industry and technology, various industries have increasingly stringent requirements on the quality of steel. The level of T[O] in the steel represents the content of non-metallic inclusions. The existence of non-metallic inclusions in the steel destroys the continuity of the steel matrix, which affects the performance and processing performance of the steel, the surface quality and the quality of the slab. Great adverse effect; sulfur in steel can promote hot cracks in metals, reduce impact toughness and corrosion resistance, and can promote segregation, promote the formation of sulfide inclusions, and affect the tensile strength, formability and anisotropy of steel , fatigue performance, etc. Therefore, T[O] and sulfur content in molten steel must be reduced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064
CPCY02P10/20
Inventor 冯远超陈天明杨森祥赵志强
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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