Production tech. of low carbon low silicon aluminium killed steel

An aluminum-killed steel, low-carbon and low-silicon technology, which is applied in the manufacture of converters, etc., can solve the problems of difficulty in advancing the heating function, slag melting, and slag making functions, etc., so as to reduce production costs, reduce production costs, The effect of releasing capacity

An aluminum-killed steel, low-carbon and low-silicon technology, which is applied in the manufacture of converters, etc., can solve the problems of difficulty in advancing the heating function, slag melting, and slag making functions, etc., so as to reduce production costs, reduce production costs, The effect of releasing capacity

CN100999770AInactive Publication Date: 2007-07-18武钢集团有限公司
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Embodiment: send raw material molten iron into converter blowing, in the process of converter tapping after converter blowing ends, add 4~6kg / t lime, 1.8~2.2kg / t lime to molten steel after deoxidation alloying treatment Pre-melted refining slag and 0.5-0.8kg / t fluorite are used for pre-forming slag. Among them, pre-melted refining slag can be bought in the market, and its melting point is lower than 1460 ° C, including 50-55% calcium oxide, 5-10% Silica, 30-35% Al2O3, the balance is auxiliary materials, and a slag stopper is added to stop the slag before the end of tapping, and the basicity of the slag is controlled to reach 6.0-8.0 after pre-forming slag and slag blocking;

[0023] Then the molten steel is sent to the argon blowing station for refining, including the following steps in the argon blowing station:

[0024] (1) Deep deoxidation: Deoxidize the molten steel after tapping from the converter by feeding aluminum wire. The operation method is: when the carbon c...

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Abstract

The present invention relates to metallurgical technology, and is especially one low carbon and low silicon aluminum-killed steel producing process with converter and continuous small square billet casting machine. The technological scheme is that the low carbon and low silicon aluminum-killed steel producing process includes making steel with molten iron in a converter pre-slagging during tapping, deeply deoxidizing, slag forming fining, soft blowing fining and calcium treatment in an argon blowing station, and final protected casting in a continuous small square billet casting machine. The present invention has lowered production cost.

Description

technical field [0001] The invention relates to the field of metallurgical technology, in particular to a production process of low-carbon, low-silicon, aluminum-killed steel suitable for a converter-billet continuous casting plant. Background technique [0002] Low-carbon and low-silicon aluminum-killed steels (such as SWRM8, SWRM10, etc.) adopt the aluminum deoxidation process, and the deoxidized product aluminum oxide has a very high melting point, which is very easy to adhere to the rough surface and gradually aggregate and grow. When these steel types are cast on the billet continuous casting machine, the aluminum oxide existing in the molten steel in the form of inclusions is easy to accumulate at the nozzle part of the tundish where the inner wall is not smooth (hereinafter referred to as aluminum oxide nodulation ), and the inner diameter of the tundish nozzle of the billet continuous casting machine is small, and its aggregates will reduce the casting channel at the...

Claims

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Application Information

Patent Timeline
18 Jul 2007
Publication
CN100999770A
IPC
C21C5/28; C21C5/36; C21C7/00
Inventors
余新河; 赵继宇