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Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof

A composite deoxidizer and intermediate alloy technology, applied in the field of iron and steel smelting deoxidation, to improve the deoxidation effect and the ability to remove inclusions, the process is reasonable, and the effect of improving mechanical properties at room temperature and high temperature

Active Publication Date: 2013-01-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although great progress has been made in the deoxidation mechanism and the removal of deoxidation products, it has not been fundamentally eliminated or alleviated

Method used

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  • Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof
  • Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof
  • Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof

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preparation example Construction

[0030] The Si-Ca-Al-Mg-RE composite deoxidizer of the present invention and its preparation method, the Si-Ca-Al-Mg-RE composite deoxidizer is composed of the following components in weight percentage: Si 40-50%, Ca 10- 12%, Al 3-4%, Mg1-1.5%, RE 10-20%, and the balance is iron. The specific steps are as follows:

[0031] 1) Use a vacuum furnace for smelting, vacuumize the melting furnace to 10-20Pa, and fill it with argon gas for protection.

[0032] 2) Heat the furnace temperature to 400-500°C, add the master alloy Si-Ca and Al, Si, Fe, etc. which are preheated at 100-200°C in proportion, and the size of the raw material is 10-100mm block, and the furnace temperature is set at 30-200°C. Slowly raise the temperature at 50°C / min until it reaches 1400-1600°C.

[0033] 3) After the charge is melted, the rare earth magnesium master alloy preheated at 100-200°C is added in proportion. The composition of rare earth magnesium is RE 3-6%, Si 30-40%, Mg 3-10%, Ca 3-10%, Balance Fe. ...

Embodiment 1

[0037] Pouring 5kg of rare earth composite deoxidizer. Vacuumize the melting furnace to 10Pa, keep it for 5 minutes, and fill it with argon protection, and the argon pressure is 0.05MPa. Heat the furnace temperature to 400°C, add Si-Ca, Al, Si, Fe, etc. respectively: 2300g, 171g, 916g and 163g, and preheat at 100°C at the same time, the size of the raw material is 20mm, in the form of a block, and the furnace temperature is set to 30 °C / min Slowly increase the temperature to 1450 °C. After the charge is melted, add 942g of rare earth magnesium master alloy and preheat at 100°C at the same time. The composition of rare earth magnesium is 4% RE, 40% Si, 8% Mg, 3% Ca, and the balance Fe. Finally, add 959g of pure rare earth elements (the weight ratio of lanthanum to cerium in the rare earth elements RE is 1:2), stir evenly after melting, and let stand for 3 minutes after stirring. The metal mold is preheated to 200°C, and when the temperature of the alloy liquid drops to 1480°C...

Embodiment 2

[0040]Pouring 10kg of rare earth composite deoxidizer. Vacuumize the melting furnace to 15Pa, keep it for 10min, and fill it with argon protection, the pressure of argon is 0.02MPa. Heat the furnace temperature to 450°C, add Si-Ca, Al, Si, Fe, etc. respectively: 4600g, 342g, 1832g and 326g, and preheat at 150°C at the same time, the size of the raw material is 40mm, in the form of a block, and the furnace temperature is set to 40 °C / min Slowly increase the temperature to 1500 °C. After the charge is melted, add 1884g of rare earth magnesium master alloy and preheat at 150°C at the same time. The composition of rare earth magnesium is 5% RE, 35% Si, 6% Mg, 4% Ca, and the balance is Fe. Finally, add 1918g of pure rare earth elements (in rare earth elements RE, the weight ratio of lanthanum to cerium is 1:2), stir evenly after melting, and let stand for 4 minutes after stirring. The metal mold is preheated to 250°C, and when the temperature of the alloy liquid drops to 1450°C, ...

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Abstract

The invention belongs to the technical field of steel smelting deoxidization, and relates to an Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer for molten steel deoxidization and a preparation method thereof. The composite deoxidizer is added to deoxidize molten steel in the converter or electric furnace tapping process or a refining process of an RH, LF (ladle furnace), VD (vacuum degasser) or the like. The alloy comprises the following components in percentage by weight: 40-50% of Si, 10-12% of Ca, 3-4% of Al, 1-1.5% of Mg, 10-20% of RE and the balance of iron. The preparation method comprises the following steps: 1) smelting in a vacuum furnace, vacuumizing the smelting furnace, and charging protective gas; 2) preheating the furnace, and adding preheated interalloy Si-Ca, Al, Si and Fe; 3) after the furnace material is molten, adding preheated RE-Mg interalloy, adding pure RE element, melting, evenly stirring, and standing; and 4) preheating the casting mold, and casting. The volatile elements Ca and Mg are added in the forms of interalloy Si-Ca and RE-Mg, thereby reducing the burnout rate of the Ca and Mg elements, and enhancing the deoxidizing effect and inclusion removal capacity of the alloy.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting deoxidation, and relates to a Si-Ca-Al-Mg-RE composite deoxidizer for molten steel deoxidation and a preparation method thereof. It is added in the tapping process of converter and electric furnace or in the refining process of RH, LF, VD, etc. to deoxidize molten steel. Background technique [0002] With the development of science and technology, there is more and more demand for steel in industry and daily life, and the quality requirements for steel are also getting higher and higher. The quality of steel is developing in the direction of purification and ultra-purification. The control of the content of harmful elements and inclusions is becoming more and more stringent, which will inevitably put forward higher requirements for the quality of raw materials such as deoxidizers for steel. Rare earths have a strong adsorption effect on oxygen, and can purify molten steel and meta...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 高金柱傅排先刘宏伟李殿中夏立军康秀红李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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