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Magnesium-and-manganese-containing deoxidizing alloy for steel making and deoxidizing method for steel making

A technology for deoxidizing alloys and alloy blocks is applied in the field of steelmaking and deoxidation, which can solve the problems of increased steelmaking costs, molten steel pollution, low melting point of calcium aluminate, etc., and achieves the effects of improving the quality of molten steel, improving the quality of molten steel and strong desulfurization ability.

Active Publication Date: 2014-02-05
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in deoxidation with aluminum: the density of aluminum is small, which causes serious burning loss of aluminum in molten steel, and the utilization rate is low; after deoxidation of aluminum, A1 with high melting point is generated. 2 o 3 Inclusions cause nodules in the continuous casting nozzle, resulting in interruption of continuous casting; A1 produced by aluminum deoxidation 2 o 3 Once the inclusions remain in the steel, it will have a negative impact on the transverse mechanical properties of the steel; aluminum resources are increasingly scarce, resulting in high aluminum prices, which will increase the cost of steelmaking
However, calcium treatment technology also brings some disadvantages: Improper calcium treatment can easily accelerate the erosion rate of the nozzle and cause molten steel pollution; calcium aluminate has a low melting point and is easy to gather, grow, and get rid of Large-grained inclusions; calcium aluminate inclusions usually do not deform after rolling, that is, they become point-like inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] In this example, the composition of the deoxidized alloy for steelmaking containing magnesium and manganese is calculated by weight percentage: Mn15%, Mg50%, Ca10%, Si10%, Ba1%, the rest is Fe and impurities with a content of no more than 0.5%.

[0023] Break the deoxidized alloy into alloy blocks with a particle size of about 70-90 mm. During the tapping process of the above molten steel, add 5 kg / tFe alloy blocks into the ladle after 30 seconds of tapping to deoxidize the molten steel and remove inclusions. Make modifications.

[0024] After testing, after the deoxidation treatment in this example, the oxygen content in molten steel is 160ppm, the desulfurization rate is 31%, and the conversion rate of sulfide inclusions such as FeS and MnS into complex sulfide inclusions such as MnS, CaS and MgS is 35%. .

example 2

[0026] In this example, the composition of the deoxidized alloy for steelmaking containing magnesium and manganese is calculated by weight percentage: Mn25%, Mg25%, Ca25%, Si5%, Ba5%, and the rest is Fe and impurities with a content of no more than 0.8%.

[0027] The deoxidized alloy is crushed into particles with a particle size of about 3-4mm, and cored wire is made into cored wire through core wrapping operation. After tapping is completed, 4kg / tFe cored wire is added to molten steel through a wire feeder. The liquid is deoxidized and the inclusions are modified.

[0028] After testing, after the deoxidation treatment in this example, the oxygen content in molten steel is 170ppm, the desulfurization rate is 35%, and the conversion rate of sulfide inclusions such as FeS and MnS into complex sulfide inclusions such as MnS, CaS and MgS is 38%. .

example 3

[0030]In this example, the composition of the deoxidized alloy for steelmaking containing magnesium and manganese is calculated by weight percentage: Mn22%, Mg40%, Ca16%, Si8%, and Ba3%, the rest is Fe and impurities with a content of no more than 0.6% .

[0031] Break the deoxidized alloy into alloy blocks with a particle size of about 70-90 mm. During the tapping process of the above molten steel, add 3 kg / tFe alloy blocks into the ladle after 30 seconds of tapping to deoxidize the molten steel and remove inclusions. Make modifications.

[0032] After testing, after the deoxidation treatment in this example, the oxygen content in molten steel is 175ppm, the desulfurization rate is 32%, and the conversion rate of sulfide inclusions such as FeS and MnS into complex sulfide inclusions such as MnS, CaS and MgS is 37%. .

[0033] The advantages of the deoxidation alloy for steelmaking and the deoxidation method of the present invention include: it can deoxidize molten steel whi...

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Abstract

The invention provides a magnesium-and-manganese-containing deoxidizing alloy for steel making and a deoxidizing method for steel making. The deoxidizing alloy comprises the following components in percentage by weight: 15-25% of Mn, 25-50% of Mg, 10-25% of Ca, 5-10% of Si, 1-5% of Ba, and the balance of Fe and other inevitable impurities. According to the deoxidizing method for steel making, the magnesium-and-manganese containing deoxidizing alloy for steel making is used for deoxidizing molten steel. The magnesium-and-manganese containing deoxidizing alloy for steel making and deoxidizing method for steel making disclosed by the invention have the beneficial effects that a strong desulfurization ability is achieved when molten steel is deoxidized, so that most of occluded foreign substances obtained after the molten steel is deoxidized are converted into composite occluded foreign substances, therefore, the quality of the molten steel can be effectively improved and increased.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and specifically relates to a deoxidation alloy for steelmaking containing magnesium and manganese and a steelmaking deoxidation method using the deoxidation alloy. Background technique [0002] Usually, in the steelmaking process, deoxidation is the process of using deoxidizing elements to reduce the oxygen content of molten steel, including the deoxidation reaction between deoxidizing elements with strong affinity for oxygen and oxygen, and the floating and removal of deoxidized products generated during the reaction. The level of oxygen content in steel directly affects the quality and performance of the final steel. High oxygen content will lead to the segregation and concentration of carbon and oxygen in the process of molten steel condensation, which will cause carbon to oxidize again, causing bubbles in the steel, which will affect the quality of the steel; in addition, oxygen will als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C21C7/06
Inventor 王建陈炼陈永戈文荪李龙曾建华蒋龙奎杨森祥杜利华
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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