Method for smelting low-carbon low-silicon aluminum killed steel on CSP (Cast Steel Plate) production line

A low-carbon, low-silicon, aluminum-killed steel technology, applied in the manufacture of converters, etc., can solve the problems of low qualified rate of components, frequent pouring of steel, and low rate of pouring of steel

Active Publication Date: 2018-03-23
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

Through the control of Als and S in the process of steel deoxidation, slag and LF furnace refining, it solves the problems of high correction rate of surface inclusion defects, low component qualification rate and broken pouring of low-carbon and low-silicon aluminum-k...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for smelting low-carbon, low-silicon, aluminum-killed steel in a CSP production line, the steps of which are:

[0044] 1) Desulfurization of molten iron: during the period, passivated magnesium and fluidized lime are used for injection, the weight ratio of purified magnesium to fluidized lime is 1:5.2, the injection speed of magnesium powder is 7.3kg / min, and the injection time is 11min; S in the hot metal after desulfurization is 0.028wt%;

[0045] 2) Carry out slag removal, add slag sticky agent according to 0.25kg / ton of steel in the slag removal, and use slag blowing gun to blow nitrogen to remove slag, and control the exposed area of ​​molten iron to 86%;

[0046] 3) Converter smelting: the tapping temperature is controlled at 1675°C; the slag is tapped with a slag thickness of 25mm and the oxygen content in molten steel is 535ppm;

[0047] 4) Tapping: When tapping reaches 1.5 minutes, add lime at 2.8kg / ton of steel;

[0048] 5) Deoxidation and alloying:...

Embodiment 2

[0063] A method for smelting low-carbon, low-silicon, aluminum-killed steel in a CSP production line, the steps of which are:

[0064] 1) Desulfurization of molten iron: during the period, passivated magnesium and fluidized lime are used for injection, the weight ratio of purified magnesium to fluidized lime is 1:6, the injection speed of magnesium powder is 7.1kg / min, and the injection time is 13min; S in molten iron after desulfurization is 0.026wt%;

[0065] 2) Carry out slag removal, add slag sticky agent according to 0.3kg / ton of steel in the slag removal, and use slag blowing gun to blow nitrogen to remove slag, and control the exposed area of ​​molten iron to 88%;

[0066] 3) Converter smelting: the tapping temperature is controlled at 1663°C; slag blocking is used to tap the steel, the slag thickness is 30mm, and the oxygen content in molten steel is 550ppm;

[0067] 4) Tapping: When tapping reaches 1.5 minutes, add lime according to 3kg / ton of steel;

[0068] 5) Deo...

Embodiment 3

[0083] A method for smelting low-carbon, low-silicon, aluminum-killed steel in a CSP production line, the steps of which are:

[0084] 1) Desulfurization of molten iron: During the period, passivated magnesium and fluidized lime are used for injection, the weight ratio of purified magnesium and fluidized lime is 1:6, the injection speed of magnesium powder is 7.2kg / min, and the injection time is 12min; S in the hot metal after desulfurization is 0.025wt%;

[0085] 2) Carry out slag removal, add slag sticky agent according to 0.25kg / ton of steel in the slag removal, and use slag blowing gun to blow nitrogen to remove slag, and control the exposed area of ​​molten iron to 86%;

[0086] 3) Converter smelting: the tapping temperature is controlled at 1671°C; the slag is used to tap the steel, the slag thickness is 25mm, and the oxygen content in the molten steel is 580ppm;

[0087] 4) Tapping: When tapping to 1min, add lime at 4kg / ton of steel;

[0088] 5) Deoxidation and alloyi...

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PUM

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Abstract

The invention relates to a method for smelting low-carbon low-silicon aluminum killed steel on a CSP (Cast Steel Plate) production line. The method comprises the steps of desulfurizing molten iron; slagging off; converter smelting; steel tapping; deoxidizing and alloying; argon blowing in an argon feeding station; refining in an LF furnace; and normally adopting protective casting to form a blank.According to the method for smelting the low-carbon low-silicon aluminum killed steel on the CSP production line provided by the invention, the problems of high substandard rate of products, low qualification rate of components, frequency of cast steel casting break and the like caused by surface quality defects in short process production for smelting the low-carbon low-silicon aluminum killed steel at present are solved, the substandard rate of the products caused by surface inclusion defects is reduced to be within 0.4 percent, the qualification rate of the components is improved to be more than 98.5 percent, and the cast steel casting break rate is reduced to be within 0.4 percent.

Description

technical field [0001] The invention relates to the field of killed steel production, in particular to a smelting method for producing low-carbon, low-silicon, aluminum-killed steel with a short CSP process. Background technique [0002] Low-carbon and low-silicon aluminum-killed steels, such as RST330, DC01 and Q235J0, are widely used in electrical, construction, machinery and other industries. For this type of steel, the market requires that it should have good ductility and stamping resistance, which requires strict surface quality for continuous casting slabs; It is necessary to ensure that silicon is controlled at Si]≤0.04%, which poses a difficult problem for the control of steelmaking process. [0003] The Chinese Patent Publication No. CN104056871 discloses "a production process for controlling inclusions". It uses low-basicity slag system to transform high-melting-point inclusions in steel into low-melting-point silicate inclusions by controlling the process of de...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C5/28C21C7/00C21C7/06C22C33/06
CPCC21C1/02C21C1/025C21C5/28C21C7/0006C21C7/0056C21C7/06C22C33/06
Inventor 徐培春刘凯吴维轩胡俊辉黄东熊英邱晨叶飞
Owner 武汉钢铁有限公司
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