Magnesium alloy for steelmaking and steelmaking deoxidization method

A magnesium alloy and alloy block technology, which is applied in the field of magnesium alloy for steelmaking and steelmaking deoxidation, can solve the problems of increased steelmaking cost, low utilization rate, molten steel pollution, etc., to improve the quality of molten steel, improve the quality of molten steel, and strengthen the The effect of desulfurization ability

Inactive Publication Date: 2014-01-29
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 magnesium alloy for steelmaking is calculated by weight percentage: 23% Al, 18% Mg, and the rest is Fe and impurities with a content not exceeding 0.5%.

[0023] Break the magnesium 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 200ppm, and the desulfurization rate is 24%.

example 2

[0026] In this example, the composition of the magnesium alloy for steelmaking is calculated by weight percentage: 18% Al, 23% Mg, and the rest is Fe and impurities with a content not exceeding 0.6%.

[0027] The magnesium 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, 4.6kg / tFe cored wire is added to molten steel through a wire feeding machine. The molten steel is deoxidized and the inclusions are modified.

[0028] After testing, after the deoxidation treatment in this example, the oxygen content in molten steel is 190ppm, and the desulfurization rate is 29%.

example 3

[0030] In this example, the composition of the magnesium alloy for steelmaking is calculated by weight percentage: 19% Al, 21% Mg, and the rest is Fe and impurities with a content not exceeding 0.8%.

[0031] Break the magnesium alloy into alloy blocks with a particle size of about 70-90 mm. During the tapping process of the above molten steel, add 4 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 210ppm, and the desulfurization rate is 31%.

[0033] The advantages of the magnesium alloy for steelmaking and the deoxidation method of the present invention include: the ability to deoxidize molten steel while having a strong desulfurization capability, for example, after deoxidation, the oxygen content can be reduced to 200ppm, and the desulfurization rate can reach more than 20%; Ca...

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Abstract

The invention provides a magnesium alloy for steelmaking and a steelmaking deoxidization method. The magnesium alloy comprises the following components by weight percent: 15-25% of Al, 15-25% of Mg and the balance of Fe and inevitable impurities. The steelmaking deoxidization method comprises the step of adopting the magnesium alloy for steelmaking to carry out deoxidization treatment on molten steel. The magnesium alloy has the beneficial effects that the magnesium alloy has relatively strong desulfurization capability while deoxidizing molten steel, can convert most inclusions after molten steel deoxidization to complex inclusions, and can effectively improve the molten steel quality.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and specifically relates to a magnesium alloy for steelmaking and a steelmaking deoxidation method using the magnesium 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 also form FeO, Fe 3 o 4 and other oxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C30/00C21C7/06C21C7/064
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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