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Method for improving calcium yield of RH vacuum furnace

A yield and vacuum furnace technology, which is applied in the field of increasing calcium yield in RH vacuum furnaces, can solve the problems of low and unstable continuous casting and casting furnaces, reduce production costs, reduce usage, and improve operations rate effect

Inactive Publication Date: 2013-01-16
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

[0009] The purpose of the present invention is to solve the problem that the thin slab continuous casting and rolling RH vacuum furnace calcium treatment yield is only 3-5% and unstable, and to improve the low number of continuous casting and casting furnaces, and to provide a RH vacuum furnace calcium The treatment yield is at least 8% and stable, and the number of continuous pouring furnaces reaches at least 9 furnaces. The method for improving the calcium yield in the RH vacuum furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for improving calcium yield in RH vacuum furnace, its steps:

[0026] 1) Carry out molten iron treatment;

[0027] 2) Converter smelting;

[0028] 3) Refining in LF furnace:

[0029] a. Argon blowing is carried out for 1.5 minutes, and positive pressure operation is adopted, that is, the pressure is higher than the ambient pressure;

[0030] b. Carry out slag removal, and the slag removal time is controlled within 3 minutes;

[0031] c. After the slag is finished, add lime according to 3.3 kg / ton of steel, add refining slag according to 0.67 kg / ton of steel, and control the amount of slag according to 6.5 kg / ton of steel, and control the oxygen content in molten steel at 380PPm;

[0032] 4) Carry out RH vacuum treatment, add lime according to 2.0 kg / ton of steel, and add refining agent or desulfurizer according to routine;

[0033] 5) Sprinkle aluminum pellets evenly on the surface of slag according to 0.4 kg / ton of steel, and then feed silicon-calcium wire...

Embodiment 2

[0037] A method for improving calcium yield in RH vacuum furnace, its steps:

[0038] 1) Carry out molten iron treatment;

[0039] 2) Converter smelting;

[0040] 3) Refining in LF furnace:

[0041] a. Argon blowing is carried out for 2 minutes, and positive pressure operation is adopted, that is, the pressure is higher than the ambient pressure;

[0042] b. Carry out slag removal, and the slag removal time is controlled at 4.5 minutes;

[0043] c. After the slag is finished, add lime according to 3.8 kg / ton of steel, add refining slag according to 0.95 kg / ton of steel, and control the amount of slag according to 6.0 kg / ton of steel, and control the oxygen content in molten steel at 390PPm;

[0044] 4) Carry out RH vacuum treatment, add lime according to 2.3 kg / ton of steel, and add refining agent or desulfurizer according to routine;

[0045] 5) Sprinkle aluminum pellets evenly on the surface of the slag according to 0.45 kg / ton of steel, and then feed silicon-calcium wir...

Embodiment 3

[0049]A method for improving calcium yield in RH vacuum furnace, its steps:

[0050] 1) Carry out molten iron treatment;

[0051] 2) Converter smelting;

[0052] 3) Refining in LF furnace:

[0053] a. Argon blowing is carried out for 2.5 minutes, and positive pressure operation is adopted, that is, the pressure is higher than the ambient pressure;

[0054] b. Carry out slag removal, and the slag removal time is controlled within 6 minutes;

[0055] c. After the slag is finished, add lime according to 4.2 kg / ton of steel, add refining slag according to 1.35 kg / ton of steel, and control the amount of slag according to 7.0 kg / ton of steel, and control the oxygen content in molten steel to 400PPm;

[0056] 4) Carry out RH vacuum treatment, add lime according to 2.6 kg / ton of steel, and add refining agent or desulfurizer according to routine;

[0057] 5) Sprinkle aluminum shot evenly on the surface of slag according to 0.2 kg / ton of steel, and then feed silicon-calcium wire acc...

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Abstract

A method for improving the calcium yield of an RH vacuum furnace includes the steps: molten iron treatment; converter smelting; refining in an LF furnace; RH vacuum treatment; and tapping and casting to form a billet. By the method, the calcium yield of the RH vacuum furnace is stably improved from 3-5% to 8-12%, and the number of continuous molten iron casting and rolling furnaces of the RH vacuum furnace is increased from 2.7 to 9, so that consumption of raw materials is reduced, the operating rate of a unit is increased, and production cost is reduced. The method is wide in applicable range, namely, the method can be used for all steel types of continuous casting and rolling RH production for sheet billets.

Description

technical field [0001] The invention relates to a molten steel smelting method, in particular to a method for increasing calcium yield in an RH vacuum furnace. Background technique [0002] The casting performance, structure and characteristics of continuous casting steel are closely related to non-metallic inclusions. Therefore, in the steelmaking process, not only the chemical composition of molten steel must be well controlled, but also the non-metallic inclusions in steel must be controlled to ensure the purity of molten steel. In order to improve the performance of steel, such as using "calcium treatment" to reduce the formation of manganese sulfide inclusions in steel, to avoid the formation of long strips of sulfide inclusions to improve the anisotropy of steel; to desulfurize molten steel through calcium treatment to reduce the "hot embrittlement" of steel "Etc., the method of "calcium treatment" to molten steel is usually used to change the form of slag inclusions ...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/072
Inventor 刘小鸥王春锋夏春祥刘凯王金平刘先同谭佳梅钱龙鲁娟
Owner 武汉钢铁有限公司