Manganese boron deoxidizer and using method thereof

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 composition of deoxidizer for deoxidation and desulfurization. Its chemical composition (percentage by weight) is: 40%-60% of Si, 15%-30% of Ba, 5%-40% of Mn, 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 deoxida...

AI Technical Summary

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