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A method for preventing flocculation of billet low-silicon steel

A low-silicon steel and billet technology, used in refining, continuous casting treatment, and steelmaking fields, can solve the problems of poor pourability of molten steel, inability to achieve continuous casting, serious flocculation, etc., to reduce costs, avoid molten steel accidents, The effect of increasing the number of continuous pouring furnaces

Active Publication Date: 2018-06-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Low-carbon and low-silicon steel is limited by the finished silicon, so aluminum is used as the final deoxidizer. Since the continuous casting sizing nozzle is only 17mm, during the pouring process, the castability of molten steel is extremely poor, and the flocculation is serious, and even two furnaces cannot be realized. The above continuous pouring causes accidents of returning molten steel, which seriously restricts the production efficiency of the casting machine and increases the cost

Method used

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  • A method for preventing flocculation of billet low-silicon steel
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  • A method for preventing flocculation of billet low-silicon steel

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Experimental program
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Effect test

Embodiment 1

[0022] Smelting 100 tons, pouring the first pot

[0023] 1. Converter process

[0024] 1) The converter adopts the high-strength point blowing method, the point blowing is 30s, and the carbon at the end point is not less than 0.042%;

[0025] 2) The maximum flow rate of bottom blowing argon is 0.12m before tapping 3 / min·t, stirring for 6min;

[0026] 3) First add 140kg of silicon-barium-calcium-iron, then add 140kg of aluminum-manganese ferromanganese, and deoxidize together. The carbon content of tapping is 0.03≤%C<0.04, blow for 30s, and add 110kg of aluminum-manganese ferromanganese into the tank as shown in the table below;

[0027]

[0028]

[0029] 2. Refining process

[0030] 1) 100kg of fluorite and 400kg of lime are added to the process of LF refining and slagging;

[0031] 2) When the molten steel S is 8PPm, the calcium-aluminum ratio is controlled at 0.19, and the number of wires to be fed is 65kg;

[0032] 3) This tank is the first tank for the pouring ...

Embodiment 2

[0035] Smelt 100 tons, pour the third pot

[0036] 1. Converter process

[0037] 1) The carbon content of the converter once turned down is 0.038%;

[0038] 2) The maximum flow rate of bottom blowing argon is 0.12m before tapping 3 / min·t, stirring for 8min;

[0039] 3) First add 140kg of silicon-barium-calcium-iron, and then add 150kg of aluminum-manganese-ferro for joint deoxidation;

[0040] 2. Refining process

[0041] 1) 98kg of fluorite and 392kg of lime are added to the LF refining slagging process;

[0042] 2) When the molten steel S is 10PPm, the calcium-aluminum ratio is controlled at 0.11, and the number of wires to be fed is 55kg;

[0043] 3) This tank is pouring the third tank of molten steel and blowing argon for 8 minutes;

[0044] 4) The sedation time is 10 minutes.

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Abstract

The invention relates to a small billet low silicon steel flocculating flow prevention method. The end point carbon content is controlled to be not lower than 0.03% by adopting a high drawing point blowing technology in a converter in the converter process; bottom argon blowing is carried out at a flow of 0.12 m<3> / min.t or less before tapping, and stirring is carried out for 5-8 min; ferroaluminium-manganese and iron barium calcium silicon are adopted to carry out common deoxidation, iron barium calcium silicon is added preferably, and then ferroaluminium-manganese is added; the addition amount of ferroaluminium-manganese is corrected according to tapping carbon and the point blowing time in the point blowing melt process; only fluorite and lime are used in the slagging process in a refining step; an appropriate calcium / aluminum ratio is controlled; the argon blowing time is controlled, wherein the argon blowing time of primary tank molten steel is 8-12 min, and the argon blowing time of continuous cast tank molten steel is 5-8 min; and the skilling time is not shorter than 10 min. The method reduces the flocculating flow phenomenon of small billet low silicon steel, improves the continuous cast furnace quantity to 8 or above, avoids molten steel return accidents, and reduces the cost.

Description

technical field [0001] The invention relates to steelmaking, refining and continuous casting treatment technologies, in particular to a method for preventing flocculation of billet low-silicon steel. Background technique [0002] Low-carbon and low-silicon steel is limited by the finished silicon, so aluminum is used as the final deoxidizer. Since the continuous casting sizing nozzle is only 17mm, during the pouring process, the castability of molten steel is extremely poor, and the flocculation is serious, and even two furnaces cannot be realized. The above continuous pouring causes the occurrence of molten steel accidents, which seriously restricts the production efficiency of the casting machine and increases the cost. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a billet low-silicon steel anti-flocculation method, which can reduce the floc phenomenon in the process of casting low-carbon low-silicon steel b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/04C21C7/072
Inventor 齐志宇李泽林梅雪辉张晓军张志文梁祥远王英林王晗桐赵志刚张丽娜
Owner ANGANG STEEL CO LTD