Aluminum-calcium deoxidizing agent and preparation method thereof

A deoxidizer, aluminum-calcium technology, applied in the field of metallurgy, can solve the problems of high cost of CaSi alloy wire, low utilization rate of calcium wire, increase of Si in molten steel, etc., to achieve the effect of fast floating, high strength of finished product, and reduced inclusion content

Inactive Publication Date: 2010-12-08
上海盛宝冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization rate of calcium wire is low and the cost is high, and th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: (Table 1)

[0013] Raw material components

Particle size (mm)

%(weight)

Metal Aluminum Powder

0~2

40

Calcium metal powder

0~2

8

Premelted Calcium Aluminate Powder

0~2

52

[0014] After the raw materials are pressed into balls according to the above components and particle sizes, the ball forming rate reaches 98%, and 98% of the balls fall freely on the cement floor from a height of 2m and are larger than 10mm. The appearance is smooth and the finish is high.

[0015] (Table 2)

[0016] Raw material components

Particle size (mm)

%(weight)

Metal Aluminum Powder

0~4

40

Calcium metal powder

0~4

8

Premelted Calcium Aluminate Powder

0~4

52

[0017] After the raw materials are pressed into balls according to the above-mentioned components and particle sizes, the ball forming rate reaches 96%, and 97% of them fall freely on the cement floo...

Embodiment 2

[0026] After the above components are pressed into balls, they are used for deoxidation when tapping the converter. They are used in the smelting of AFT011 steel in a steel factory. After adding 2.5kg / t molten steel, the obtained results are as follows:

[0027] Oxygen 22ppm before argon after addition. Compared with the original deoxidizer, the oxygen content in molten steel is reduced by 6ppm. The on-site environment is pollution-free. The fluidity of molten steel is good, and there is no nodule in the nozzle.

Embodiment 3

34

[0031] After the above components are pressed into balls, they are used for deoxidation when tapping the converter. They are used in the smelting of AFT011 steel in a steel factory. After adding 2.5kg / t molten steel, the obtained results are as follows:

[0032] After the addition of argon and before oxygen 20ppm. Compared with the original deoxidizer, the oxygen content in molten steel is reduced by 8ppm. The on-site environment is pollution-free. The fluidity of molten steel is good, and there is no nodule in the nozzle.

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PUM

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Abstract

The invention relates to the technical field of metallurgy, in particular to an aluminum-calcium deoxidizing agent and a preparation method thereof. The deoxidizing agent is a ball-shaped composition prepared from powder of aluminum powder, calcium powder, premelting calcium aluminate powder and the like. By virtue of the components as well as shapes and sizes thereof and balled shapes of the composition, in the using process, the deoxidizing agent has the advantages that the calcium powder, the calcium powder and the premelting calcium aluminate powder are pressed into balls, and the preparation method is simple; the strength of a finished product is high, and the finished product can be directly used by the overhead bin of a steel factory; the reduction capability is high, the deoxidizing capability on molten steel is strong, and the total oxygen content of the molten steel is low when compared with the same type of deoxidizing agents; a deoxidizing product grows by mutual accumulation, and quickly floats up, the content of inclusion in the steel is reduced, and the inclusion is modified simultaneously; and the flowability of molten steel is good when in casting.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to pressing metal aluminum powder, metal calcium powder and pre-melted calcium aluminate powder into balls. It is added in the tapping process of converter and electric furnace or in the refining process of RH and LF to deoxidize molten steel. Background technique [0002] Metal aluminum as a deep deoxidizer has been widely used in converter or electric furnace smelting and tapping, and its good deoxidation performance has been recognized by everyone. At present, aluminum deoxidizers used include metal aluminum ingots, aluminum iron, etc. Produced Al 2 o 3 A large number of solid inclusions will exist in the molten steel and are not easy to float up. If they are not removed in the subsequent smelting process, it will not only cause nodules in the nozzle during continuous casting, but also reduce the mechanical properties and machinability of the finished steel. In order to elimi...

Claims

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Application Information

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IPC IPC(8): C21C7/06B22F1/00B22F3/02
Inventor 刘欣隆孙树森周四明
Owner 上海盛宝冶金科技有限公司
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