Carburant for manganese-carbon alloy

A carbon alloy and recarburizer technology, applied in the field of carbon alloy recarburizer, can solve the problems of high and low carbonization effect of recarburizer, low smelting rate of steel plant varieties, low proportion of recarburizer, etc. Carbon effect is good, the cost of steelmaking is reduced, and the consumption of alloys is saved

Active Publication Date: 2005-09-14
上海盛宝冶金科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This carburizer has the following disadvantages: 1. The specific gravity is small, and its bulk specific gravity is only 0.6g / cm 3 , while the specific gravity of molten steel reaches about 7.8g / cm 3 , therefore, when the recarburizer is added to the molten steel, it quickly floats to the surface of the molten steel, enters the slag and burns
2. When the steel is tapped, the oxidizing slag floats on the surface of the molten steel, and it is easy to react with the carbon in the carburizing agent, causing the carburizing agent to burn out
Therefore, the carburizing effect of the existing carburizing agent will fluctuate (50-85%), so that the carbon content in the steel often occurs in the steel plant below the lower limit of the steel grade and higher than the upper limit of the steel grade, which is likely to cause steel The refining rate of the factory varieties is low, and more seriously, waste products will be produced
On June 3, 2002, our company applied for the patent of "Metal and Carbon Material Combination Carburizer and Its Preparation Method", the patent number is: 02122559.1. In the future production site use, we found that although the patent has improved the increase Carbon stability and carburization efficiency, but because the proportion of the patented carburizer is still low, the corresponding carbon yield is still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0005] Embodiment 1: In terms of 100 kilograms, the proportioning of the recarburizer is: 77 kilograms of high-carbon ferromanganese powder, 21.5 kilograms of graphite, and 1.5 kilograms of silica sol. The particle size of the components is 0.5-6.0mm, and then the ingredients are mixed according to the ratio. The prepared materials are mixed with a mixer, and the compact is formed with a ball press machine. The finished product is baked at a temperature of 110 degrees for 7 hours. The finished product has a particle size of Φ20×50mm, its composition is C20-23%, Mn53-55%. Its carburizing effect reaches 85-90%, realizing stable carburizing.

Embodiment 2

[0006] Embodiment 2: based on 100 kilograms, the proportioning of the recarburizer is: 49.5 kilograms of high-carbon ferromanganese powder (Mn content greater than or equal to 71%), 49 kilograms of graphite, and 1.5 kilograms of silica sol. The particle size of the components is 0.5-6.0mm, and then the ingredients are mixed according to the ratio. The prepared materials are mixed with a mixer, and the compact is formed with a ball press machine. The finished product is baked at a temperature of 115 degrees for 6.5 hours. The finished product has a particle size of Φ20×50mm, its composition is C45-47%, Mn35.01-37%. Its carburizing effect reaches 82-87%, realizing stable carburizing.

Embodiment 3

[0007] Embodiment 3: In terms of 100 kilograms, the proportioning of the recarburizer is: 50 kilograms of medium-carbon ferromanganese powder, 44 kilograms of graphite, 4.5 kilograms of iron powder, and 1.5 kilograms of silica sol. Components C45-47%, Mn36-39% are obtained. All the other are identical with embodiment 1.

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Abstract

This invention relates to a recarburizer used in steelmaking process, especially relates to alloy recarburizer. Manganese and iron content is increased and specific gravity is increased so recarburization effect is improved. Technique plan is that manganese carbon alloy recarburizer is made by metal alloy powder and carbon material and binding agent. Metal alloy powder can be manganese iron powder or compound of manganese iron powder and iron powder. Carbon material is selected from coke, pitch coke, petroleum coke, carbon powder, coal dust and graphite. This product contains C 20~47%, Mn 35.01~55%, binding agent, silicasol 0.5~2%, it is mainlt used in liquid steel recarburization during steelmaking process.

Description

technical field [0001] The invention relates to a recarburizer used in the steelmaking process, in particular to a manganese-carbon alloy recarburizer combined with metal and carbon materials. Background technique [0002] At present, various steel mills use recarburizers to increase the carbon content of molten steel to adjust the carbon content in the steel to meet the steel specification requirements. The carburizer currently used is generally pitch coke, its physical and chemical indicators are: C ≥ 98%, the particle size is 5-15mm, and the bulk specific gravity is 0.6g / cm 3 , the adding method is: when the molten steel is tapped, it is added into the molten steel tank together with the molten steel, relying on the high temperature melting of the molten steel and melting the pitch coke to realize the carburization of the molten steel. This carburizer has the following disadvantages: 1. The specific gravity is small, and its bulk specific gravity is only 0.6g / cm 3 , whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C22C22/00C22C30/00
Inventor 刘欣隆孙树森王金潮周四明
Owner 上海盛宝冶金科技有限公司
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