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A method for accurately controlling the sulfur content of molten steel in an lf furnace

A technology of sulfur content and molten steel, applied in the field of metallurgy, can solve the problem of high cost, achieve the effect of improving production efficiency and reducing production cost

Active Publication Date: 2017-08-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to control the sulfur content in steel to a certain value by conventional refining methods.
In order to control the sulfur content to not be lower than a certain target value, it is generally forced to increase sulfur by feeding the ferrous sulfide wire at the end, and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] To produce ER70S-G welding wire steel, clean molten steel tanks with slag-free bottom and steel bottom are used to hold molten steel, and the sulfur in steelmaking and tapping is controlled within the target sulfur of the finished product ~ (target sulfur of the finished product + 0.010%), specifically including the following steps:

[0022] 1) If the steelmaking tapping sulfur is (the target sulfur of the finished product-0.002%)~the target sulfur of the finished product, the basicity of the top slag during the entire LF furnace refining process of the molten steel tank is controlled at 0.8~<1.0.

[0023] 2) If steelmaking and tapping sulfur > finished product target sulfur ~ (finished product target sulfur + 0.002%), control the alkalinity of the top slag during the entire refining process of the molten steel tank to 1.1.

[0024] 3) If steelmaking and tapping sulfur > (finished product target sulfur + 0.002%), control the basicity of the top slag at 1.8-4.0 in the ear...

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PUM

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Abstract

The invention relates to a molten steel sulphur content accurate control method for an LF. Molten steel is contained in a clean molten steel tank without a slag bottom or a steel bottom, sulphur of steelmaking tapping is controlled to be within the range from (the target finished product sulphur content - 0.002%) to (the target finished product sulphur content +0.040%), and the content of tapping sulphur is adjusted by mainly having control over the top dross alkalinity in the whole LF refining process of molten steel. The molten steel sulphur content accurate control method for the LF has the advantages that under the condition that no sulfide is added into the LF, the sulphur content of a low-cost smelt steel grade finished product is controlled to be within the range from (the target finished product sulphur content - 0.002%) to (the target finished product sulphur content +0.040%), the production cost is reduced, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an operation method for precisely controlling the sulfur content of molten steel not lower than a certain value. Background technique [0002] LF furnace (Ladle Furnace) is the ladle refining furnace, which is the main refining equipment outside the furnace in steel production. When smelting most steel types, it is desirable that the sulfur content in the steel be as low as possible. In the refining LF furnace, alkaline slag is mainly produced, and the sulfur content in the steel gradually decreases with the refining process. There are also some steel grades that hope that the sulfur content in the steel is neither higher than a certain value nor lower than a certain value, and the target sulfur content of the steel grade is controlled within a narrow range. It is difficult to control the sulfur content in steel to be stable around a certain value by conventional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/076
CPCY02P10/20
Inventor 徐向阳李田张晓军刘建东闻学东许艳丽
Owner ANGANG STEEL CO LTD