Nitrogen-increasing method for molten steel of ultra-low carbon enamel steel

An enamelled steel, ultra-low carbon technology, applied in the field of iron and steel metallurgy, can solve the unsolved problems such as the matching of nitrogen increasing operation time, refining cycle and continuous casting rhythm.
CN103911490BActive Publication Date: 2015-08-26SHOUGANG CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHOUGANG CORPORATION
Publication Date
2015-08-26

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for adding nitrogen to ultra-low carbon enamel molten steel. The method comprises the following steps: decarbonizing by utilizing nitrogen as a lift gas while controlling the flow of the lift gas at 150-170Nm<3> / h, and exhausting, so that the vacuum degree of a decarburization furnace is not greater than 100Pa; gradually lifting the flow of the lift gas to 210-230Nm<3> / h, and finishing the decarburization stage until the carbon content in the molten steel is not greater than 20ppm, wherein the vacuum degree of the decarburization furnace is not greater than 1kPa; carrying out a deoxidation operation; adding alloy and controlling the flow of the lift gas in an interval corresponding to 160-180Nm<3> / h or 200-220Nm<3> / h; breaking vacuum until the molten steel accords with the ultra-low carbon enamel molten steel ingredient. Nitrogen is added in decarburization by controlling the flow of the lift gas of nitrogen, the vacuum degree and the decarburization time of the decarburization furnace in the decarburization and deoxidation processes, so that the nitrogen content of a finished product can be accurately controlled, use of alloy is reduced, and the cost is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a method for increasing nitrogen in molten steel of ultra-low carbon enamel steel. Background technique

[0002] Nitrogen is easy to combine with Al, Ti, Nb, B and other elements to form compounds. When nitrogen combines with B elements to form boron nitride, it will not be able to play the role of nitrogen and increase the source of cracks during deformation. Therefore, for most steel types, nitrogen is a harmful element, and its content should be reduced as much as possible during the smelting process. However, for ultra-low carbon enamelled steel, not only deep drawing performance is required, but also in order to ensure sufficient second-phase particles to meet the anti-knock performance requirements of the steel, nitrogen needs to combine with titanium in the steel to form nitrides, and then Nitrogen needs to be added to the molten steel during the smeltin...

Claims

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