Slab molten steel refining method and steel plate smelting method

A molten steel and slab technology, which is applied in the refining method of slab molten steel and the field of steel plate smelting, can solve the problem that the slab molten steel cannot be poured directly into continuous casting, and achieve the effects of reducing production costs and promoting melting

Active Publication Date: 2019-11-26
SGIS SONGSHAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the deficiencies in the prior art, the purpose of the embodiment of the present application includes providing a method for refining molten steel of slab and a method for smelting steel plate, so as to improve the technical problem that the molten steel of slab cannot be poured directly into continuous casting after being processed by an argon station

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  • Slab molten steel refining method and steel plate smelting method

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Embodiment 1

[0063] This embodiment provides a slab molten steel refining method and a steel plate smelting method, specifically Q235B steel, including:

[0064] The component control requirements of the finished product are: C: 0.13-0.17wt%, Si: 0.12-0.35wt%, Mn: 0.40-0.60wt%, P: ≤0.030wt%, S: ≤0.030wt%. The tapping capacity of the converter is 120 tons.

[0065] 1. The carbon content at the end point of the converter is 0.08wt%, and the added amount of aluminum and iron is calculated according to the relational formula (1). Between 10-20 tons of steel is tapped from the converter, 196kg of aluminum-iron and silicon-manganese and other alloys are added, and the amount of silicon-manganese and other alloys is determined by the composition of the finished product. 400kg of lime is added between 30-40 tons of converter tapping, 70kg of high-alumina slag is added between 90-120 tons of converter, and 7ppm of oxygen is fixed in the argon station. During the tapping process of the converter, ...

Embodiment 2

[0070] This embodiment provides a slab molten steel refining method and a steel plate smelting method, specifically ship plate B steel, including:

[0071] The component control requirements of the finished product are: C: 0.14-0.18wt%, Si: 0.12-0.30wt%, Mn: 0.60-0.90wt%, P: ≤0.028wt%, S: ≤0.023wt%, Als: 0.015-0.030wt% %. The tapping capacity of the converter is 120 tons.

[0072] 1. The carbon content at the end point of the converter is 0.06wt%, and the added amount of aluminum and iron is calculated according to the relational formula (1). Between 10-20 tons of converter tapping, 245kg of aluminum-iron and silicon-manganese alloys are added, between 30-40 tons of tapping, 400kg of lime is added, between 90-120 tons of high-alumina slag, 70kg of high-alumina slag is added, and the oxygen is fixed at 5ppm in an argon station. During the tapping process of the converter, the argon blowing flow rate is 40NM 3 / h.

[0073] 2. The exposed diameter of molten steel is 40cm, and...

Embodiment 3

[0077] This embodiment provides a slab molten steel refining method and a steel plate smelting method, specifically Q345B steel, including:

[0078] The component control requirements of the finished product are: C: 0.14-0.18wt%, Si: 0.15-0.40wt%, Mn: 1.40-1.60wt%, P: ≤0.028wt%, S: ≤0.025wt%, Als: 0.010-0.040wt% %. The tapping capacity of the converter is 120 tons.

[0079] 1. The carbon content at the end point of the converter is 0.04wt%, and the amount of aluminum and iron added is calculated according to the relational formula (1). Between 10-20 tons of steel from the converter, 337kg of aluminum-iron and silicon-manganese alloys are added, between 30-40 tons of steel, 400kg of lime is added, between 90-120 tons of steel, 100kg of high-alumina slag is added, and the oxygen is fixed at 5ppm in an argon station. During the tapping process of the converter, the argon blowing flow rate is 50NM 3 / h.

[0080] 2. The exposed diameter of molten steel is 35cm, and the argon bl...

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Abstract

The invention relates to a slab molten steel refining method and a steel plate smelting method, and belongs to the technical field of refining methods. The slab molten steel refining method includes the steps of sequentially adding ferro-aluminum, lime and high alumina slag to molten steel under the bottom argon blowing conditions in the molten steel tapping process of a converter, and controllingthe addition amount of the ferro-aluminum and high alumina slag according to the end point carbon content of the converter. In the refining process of an argon station, top slag is obtained through strong and weak argon stirring by means of the bottom argon blowing. The top slag comprises 45-55 wt% of CaO, 20-30 wt% of Al2O3 and smaller than 1 wt% of TFe and MnO. By controlling the addition amount of the ferro-aluminum and high alumina slag according to the end point carbon content of the converter in the molten steel tapping process of the converter, modifying the top slag through strong andweak argon stirring at the argon station after molten steel tapping, reducing the content of TFe and MnO in the top slag and controlling the components of the top slag, the molten steel can be directly continuously cast and poured after being processed at the argon station, and production cost is reduced.

Description

technical field [0001] The application belongs to the technical field of refining methods, and relates to a slab molten steel refining method and a steel plate smelting method. Background technique [0002] At present, most steel mills produce molten steel for slabs, which are poured on slab continuous casting machines after LF (ladle refining), LF+RH or RH (liquid steel vacuum treatment), and the production cost is relatively high. It has been reported that the use of metallurgical lime and aluminum particles to modify ladle slag produces little soot and lasts for a short period of time, and the modification effect is good. However, after modification by this method, continuous casting and pouring is required after continuous RH treatment. , not suitable for continuous casting after the molten steel passes through the argon station; it is reported that the method of mechanical stirring is used to stir the top slag, so as to promote the full contact and reaction between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00C21C5/28
CPCC21C5/28C21C7/0056C21C7/06
Inventor 刘志龙丘文生张志明张波万翔曾令宇王冠刘志明赵科邓长付覃小锋余大华胡现锋黎莉任世岗
Owner SGIS SONGSHAN CO LTD
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