Using method of manganese boron deoxidizer
A manganese boron deoxidizer and technology of deoxidizer, applied in the field of refining deoxidizer and manganese boron deoxidizer, can solve the problem that deoxidizer cannot denitrify and fix nitrogen and so on.
Active Publication Date: 2012-12-19
ANGANG STEEL CO LTD
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Problems solved by technology
[0007] The invention discloses a manganese boron deoxidizer with the function of denitrification and nitrogen fixation and its use method, which solves the problem that the current deoxidizer cannot denitrify and fix nitrogen while deoxidizing
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Embodiment Construction
[0012] The specific implementation of the present invention will be described in detail below; the manganese boron deoxidizer with denitrification and nitrogen fixation function provided by the present invention is mainly composed of manganese and boron (percentage by weight), wherein the manganese content is 87% ~ 97%, and the boron content is 2% ~12%, the control impurity content is ≤1.5%, and the particle size of the deoxidizer is required to be 40~120mm.
[0013] The above raw materials are required to be baked before use, the baking temperature is 80°C~160°C, and the baking time is 6~15 hours, so that the moisture content is less than 0.5%. The deoxidizer requires that after the initial deoxidation of the molten steel with a strong deoxidizer such as aluminum deoxidizer and ferrosilicon, the oxygen activity of the molten steel is (5~30)×10 -6 Add under certain conditions, and at the same time, it is required to use lime-covered tanks for molten steel, and the addition amo...
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Abstract
The invention discloses a manganese boron deoxidizer and a using method thereof. The manganese boron deoxidizer comprises the following chemical components in percentage by weight: 87 to 97 percent of manganese, 2 to 12 percent of boron and less than or equal to 1.5 percent of impurities and has the granularity of 50 to 100 mm. The using method comprises the following steps of: baking the raw materials at 80 to 160 DEG C for 6 to 15 hours till the water content is less than 0.5 percent; adding the deoxidizer under the condition that the oxygen activity of steel liquid is (5-30)*10<6>, wherein the addition amount is 1 to 4 kg / t; during refining the steel liquid, adding the deoxidizer under a condition that the temperature of the steel liquid is between 1540 and 1610 DEG C based on the standard of 2 to 6 kg / t and stirring by introducing argon at the same time, wherein the flow rate of the argon is kept in the range from 200 to 400 NL / min, and the stirring time is 5 to 20 minutes; and under the condition that the nitrogen content is (40-60)*10<-6> before the manganese boron deoxidizer is used, adding the manganese boron deoxidizer in the steel based on the standard of 2 to 6 kg / t to reduce the nitrogen content in the steel by 7 to 40 percent. At the same time, gap nitrogen atoms between the boron and the steel form a stable compound to fix nitrogen.
Description
technical field [0001] The invention belongs to the field of steelmaking and refining, and relates to a refining deoxidizer, in particular to a manganese boron deoxidizer capable of denitrifying and fixing molten steel and a use method thereof. Background technique [0002] In the refining process of steel, the deoxidizer can deoxidize the molten steel. Deoxidizers can be divided into strong deoxidizers and weak deoxidizers according to their deoxidizing ability. Aluminum deoxidizer, ferro-titanium, etc. are strong deoxidizers. Ferromanganese is a weak deoxidizer. [0003] The patent "manganese-aluminum composite deoxidizer (CN02104292.6)" provides the components of the deoxidizer for deoxidation and desulfurization. Its chemical composition (weight percentage) is: Si 40%~60%, Ba 15%~30%, Mn 5%~40%, and the balance is Fe and unavoidable impurities. The deoxidizer can complete the deoxidation and alloying of molten steel in one step; at the same time, the deoxidation abil...
Claims
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IPC IPC(8): C21C7/06C22C22/00C22C35/00C22C33/06
Inventor 郭大勇马成任玉辉李德刚张晓军杨辉耿继双曹亚丹白喜峰常桂华
Owner ANGANG STEEL CO LTD