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Steelmaking method with efficient refining

A high-efficiency, refining technology, applied in the field of steel smelting, can solve the problems of reducing refining slagging time, difficulty in washing slag from converter steel slag, shortening LF refining cycle, etc., to achieve the effect of reducing refining slagging time and shortening refining cycle

Active Publication Date: 2020-11-06
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

[0010] The purpose of the present invention is to overcome the problems existing in the prior art, such as the difficulty in washing and slagging of converter tapping slag, and the long time of LF refining slagging, and provide a technical measure such as adding a rapid refining fluorine-free slagging agent, so that the converter can quickly slag, The slagging time can be shortened by 2~3 minutes, and the refining slagging time can be reduced, and the LF refining cycle can be shortened by at least 5 minutes. A high-efficiency refining steelmaking method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment is carried out in a 180t converter.

[0033] A steelmaking method with high-efficiency refining, the steps of which are:

[0034] 1) into conventional converter smelting;

[0035] 2) Tapping:

[0036] A. When the converter blowing end temperature is 1675°C, the steel is tapped, the end point O: 0.060%, S: 0.012%; when the steel is tapped to one third, silicon-manganese alloy is added at one time according to the composition control target; 1.25kg / ton of steel added to aluminum-iron alloy;

[0037] B. When the converter is tapped to two-thirds, add lime and rapid refining fluorine-free slagging agent at the same time, the amount of lime added is 2.35kg / ton of steel, and the rapid refining fluorine-free slag adjusting agent is 0.65kg / ton of steel Add; After adding lime and fast refining fluorine-free slagging agent, argon stirring is started at the bottom of the ladle at 60s, and the intensity of argon blowing is 0.45Nm 3 / h·ton of steel, continue to b...

Embodiment 2

[0045] This embodiment is carried out in a 180t converter.

[0046] A steelmaking method with high-efficiency refining, the steps of which are:

[0047] 1) into conventional converter smelting;

[0048] 2) Tapping:

[0049] A. When the converter blowing end temperature is 1670°C, the steel is tapped, the end point O: 0.070%, S: 0.018%; when the steel is tapped to one-third, the silicon-manganese alloy is added at one time according to the composition control target; 1.76kg / ton of steel added to aluminum-iron alloy;

[0050] B. When the converter is tapped to two-thirds, add lime and rapid refining fluorine-free slagging agent at the same time, the amount of lime added is 3.02kg / ton of steel, and the rapid refining fluorine-free slag adjusting agent is 1.0kg / ton of steel Add; after the addition of lime and rapid refining fluorine-free slagging agent, start argon stirring at the bottom of the ladle at 58s. The intensity of argon blowing is 0.55Nm3 / h per ton of steel. ;

[0...

Embodiment 3

[0058] This embodiment is carried out in a 180t converter.

[0059] A steelmaking method with high-efficiency refining, the steps of which are:

[0060] 1) into conventional converter smelting;

[0061] 2) Tapping:

[0062] A. When the end temperature of converter blowing is 1665°C, the steel is tapped, the end point O: 0.065%, S: 0.014%; when the steel is tapped to one-third, silicon-manganese alloy is added at one time according to the composition control target; 2.05kg / ton of steel added to aluminum-iron alloy;

[0063] B. When the converter is tapped to two-thirds, add lime and rapid refining fluorine-free slagging agent at the same time, the amount of lime added is 3.52kg / ton of steel, and the rapid refining fluorine-free slag adjusting agent is 1.25kg / ton of steel Add; after the addition of lime and rapid refining fluorine-free slagging agent, start argon stirring at the bottom of the ladle at 58s. The intensity of argon blowing is 0.60Nm3 / h per ton of steel. ;

[0...

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Abstract

The invention discloses a steelmaking method with efficient refining. The steelmaking method includes the steps that smelting is carried out by a conventional converter; tapping is carried out, specifically, silico-manganese alloy is added when tapping is carried out to one third; lime and a fast-refining fluoride-free slag-regulating agent are added at the same time when tapping is carried out two thirds; deoxidation is carried out at argon station: firstly aluminum wires are added, and then ferro-aluminum is added to the surface of ladle slag; and continuous casting and post processes are carried out. Through the technical measures such as adding the fast-refining fluoride-free slag-regulating agent, the rapid slagging time of the converter is shortened by 3 minutes, the refining slagging time is reduced, and the LF refining cycle is shortened by at least 5 min.

Description

technical field [0001] The invention relates to a steel smelting method, which specifically belongs to a steelmaking method with high-efficiency refining. Background technique [0002] In recent years, with the increase of continuous casting casting speed and the increase of production cost pressure, how to shorten the refining cycle to meet the requirements of continuous casting high casting speed for molten steel cleanliness and production rhythm has become a key problem to be solved in the steelmaking process. Refining slagging process is one of the key technologies of steelmaking. The effect of refining slagging directly affects the desulfurization of molten steel, the floating removal of inclusions and the smooth production. Since refining slagging involves process operations such as slag steel deoxidation, electrode heating, slag melting, stirring, etc., refining slagging takes a long time, accounting for more than one-third of the refining cycle. Therefore, how to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/072C21C7/06C22C33/06B22D11/116B22D11/117
CPCC21C7/076C21C7/072C21C7/06C22C33/06B22D11/116B22D11/117Y02P10/20
Inventor 朱万军沈继胜周甫万恩同邱晨徐培春欧阳德刚杨成威孙伟
Owner 武汉钢铁有限公司
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