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A method for direct continuous casting of molten iron into billets

A technology of continuous casting of molten iron, which is applied in the field of direct continuous casting of steel billets without the molten iron passing through the converter or electric furnace, so as to achieve the effects of reducing the process, ensuring continuity and saving production time

Active Publication Date: 2019-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no report on the steelmaking method in which blast furnace molten iron is directly cast into billets without passing through the converter or electric furnace.

Method used

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  • A method for direct continuous casting of molten iron into billets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] [Example 1] Taking the smelting of Q235B steel as an example;

[0030] 1) The temperature of the molten iron is 1480°C. In the first U-shaped tank 3, the molten iron is desulfurized to a sulfur content of 0.010% by Ca-Mg composite desulfurization;

[0031] 2) After desulfurization, the molten iron passes through the sealed iron trough 6, and blows oxygen through the oxygen lance 7 so that the FeO content in the molten iron reaches 18%;

[0032] 3) In the second U-shaped groove 10, the composite slagging material of active lime+fluorite+light-burned dolomite is sprayed through the spray gun 9, and the weight ratio of each component is active lime: fluorite: light-burned dolomite=15: 1:6, the main chemical composition of tapping is: carbon 0.11%, phosphorus 0.015%, sulfur 0.009%, tapping temperature 1665°C;

[0033] 4) Carry out alloying treatment on the molten steel at the tap hole 11, the components of the treated molten steel are C: 0.16%; Si: 0.080%; Mn: 0.27%; P: 0....

Embodiment 2

[0035] [Example 2] Taking the smelted SPHC steel grade as an example;

[0036] 1) The temperature of the molten iron is 1500°C. In the first U-shaped tank 3, the molten iron is desulfurized to a sulfur content of 0.005% by Ca-Mg composite desulfurization;

[0037] 2) After desulfurization, the molten iron passes through the sealed iron trough 6, and blows oxygen through the oxygen lance 7 so that the FeO content in the molten iron reaches 20%;

[0038] 3) In the second U-shaped groove 10, the composite slagging material of active lime+fluorite+light-burned dolomite is sprayed through the spray gun 9, and the weight ratio of each component is active lime: fluorite: light-burned dolomite=15 :1:6, the main chemical composition of tapping is: carbon 0.05%, phosphorus 0.013%, sulfur 0.007%, tapping temperature 1670°C;

[0039] 4) Carry out alloying treatment on the molten steel at the tap hole 11, the composition of the treated molten steel is C: 0.06%; Si: 0.007%: Mn: 0.21%: P: 0...

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Abstract

The invention relates to a method of directly and continuously casting molten iron into a steel billet. The method comprises the technological steps of blast-furnace tapping, desulfuration pretreatment on the molten iron in a groove, primary deslagging, oxygen injection with an oxygen lance in a closed iron runner, dephosphorization and slag making material adding, secondary deslagging, passing aniron runner, entering a tundish and treatment in a crystallizer. The method adopts a continuous production mode and various processes of steel making are integrated, rapid treatment on molten iron and direct continuous casting into the billet are realized, a molten iron transportation process from a blast furnace to a rotary furnace is omitted, a series of supporting facilities needed by rotary furnace smelting are omitted, the processes are simplified substantially, the production time is shortened, cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for direct continuous casting of molten iron into billets without passing through a converter or an electric furnace. Background technique [0002] The two major issues in the development of the modern iron and steel industry are the production of ultra-pure steel, and the second is to greatly simplify the process flow and develop in the direction of specialization, continuity, automation, and high speed. Only by making the entire production process from ore to billet continuous , it is possible to meet the high-speed requirements. [0003] At present, there is no report on a steelmaking method in which blast furnace molten iron is directly continuously cast into billets without going through a converter or an electric furnace. Contents of the invention [0004] The invention provides a method for direct continuous casting of molten iron into steel slabs. The cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D1/00B22D11/04C21C7/064C21C7/072C21C7/04
CPCB22D1/00B22D11/04C21C7/04C21C7/064C21C7/072
Inventor 王鲁毅赵雷金百刚马宁牛兴明刘文飞
Owner ANGANG STEEL CO LTD
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