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Method for improving cleanliness of liquid steel in first ladle while casting

A technology of cleanliness and molten steel, applied in the field of metallurgical continuous casting technology, can solve the problems of serious problems in the control of inclusions in steel, and achieve the effect of improving cleanliness

Inactive Publication Date: 2013-08-28
ANGANG STEEL CO LTD
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Problems solved by technology

[0002] With the continuous development of science and technology, the pouring mold casting method of steel is gradually replaced by the continuous casting pouring mode. The continuous casting steel pouring mode has obvious advantages in terms of cost, scale, and environmental protection, but there are also certain problems, especially the pouring of the first tank. Quality problems, there are serious problems in the control of inclusions in steel

Method used

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with specific embodiment:

[0014] A method for improving the cleanliness of molten steel in the first pot of pouring includes two aspects: the increase of inclusions caused by the oxidation of molten steel during the pouring stage and the shedding of refractory materials caused by the rapid temperature rise, wherein the increase of inclusions caused by the oxidation of molten steel during the pouring stage , the specific control steps are as follows:

[0015] ① Stop baking in the tundish until the pouring of the first can is completed. During the knotting process of the tundish cover, 5 argon blowing ports are preset inside, with a length of 300~500m 3 Blow argon gas into the tundish at a flow rate of / h, and replace the oxidative atmosphere in the tundish with an inert atmosphere within 3 minutes;

[0016] ②When the tundish baking is stopped and before pouring is started, the argon blowing flow rate...

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Abstract

The invention belongs to the field of continuous casting processes in metallurgy and particularly relates to a method for improving the cleanliness of liquid steel in a first ladle while casting. The method is characterized by comprising two aspects, namely oxidizing liquid steel at a casting phase to increase impurities and causing falling by rapidly raising the temperature of a fireproof material; and aiming at the increase of the impurities caused by oxidizing the liquid steel at the casting phase, the method comprises the specific control steps of: (1) before casting, displacing an oxidized atmosphere in a tundish into an inert atmosphere; (2) sealing an submerged nozzle and preventing the air from entering the tundish; and (3) after the tundish is dried, reducing the air feeding amount. Aiming at the falling by rapidly raising the temperature of the fireproof material, the method comprises the specific control steps of: (1) sufficiently discharging water or a bonding agent in the fireproof material of the tundish; and (2) improving the drying temperature of the tundish to 1500 DEG C and lasting for 10-20 minutes. Compared with the prior art, the method disclosed by the invention has the beneficial effect that the cleanliness of the liquid steel in the first ladle can be controlled to the level of a normal pot.

Description

technical field [0001] The invention belongs to the field of metallurgical continuous casting technology, and in particular relates to a method for improving the cleanliness of molten steel in the first pot of pouring. Background technique [0002] With the continuous development of science and technology, the pouring mold casting method of steel is gradually replaced by the continuous casting pouring mode. The continuous casting steel pouring mode has obvious advantages in terms of cost, scale, and environmental protection, but there are also certain problems, especially the pouring of the first tank. Quality problems, there are serious problems in the control of inclusions in steel. Especially for some special steel types that have extremely high requirements on inclusions in steel, how to ensure the control of inclusions in the first pot, and improve the cleanliness of the first pot of molten steel is the key link that restricts continuous casting to produce special varie...

Claims

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Application Information

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IPC IPC(8): B22D1/00
Inventor 宁东王宁罗建华陈志威
Owner ANGANG STEEL CO LTD
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