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Silicon nitride vanadium microalloy and preparation method thereof

A silicon vanadium nitride and microalloy technology, applied in the field of metallurgy, can solve the problems of unstable composition and poor performance of the silicon nitride vanadium microalloy, and achieve the effects of less harsh reaction conditions, improved recovery rate and obvious economic benefits.

Active Publication Date: 2019-07-02
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is: the composition of the silicon nitride vanadium microalloy prepared by the existing method is unstable, the performance is not good, etc.

Method used

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Examples

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preparation example Construction

[0019] The invention provides a method for preparing a silicon nitride vanadium microalloy, comprising the following steps:

[0020] a. Proportion the ferrovanadium and ferrosilicon powder according to the weight ratio of 2.5-3.0:7.0-8.0, and mix them evenly;

[0021] b. Using a hydraulic sample making machine to press and form, put it into a heating furnace for nitriding synthesis reaction, and obtain a silicon nitride vanadium microalloy.

[0022] Wherein, in order to increase the vanadium content and silicon content in the alloy, in the preparation method of the above-mentioned silicon nitride vanadium microalloy, the ferrovanadium described in step a is FeV80 alloy, and the described ferrosilicon is FeSi75.

[0023] Wherein, in order to carry out the reaction more thoroughly, in the preparation method of the above-mentioned silicon-vanadium nitride microalloy, the particle diameter of the ferrovanadium and ferrosilicon powder described in step a is to pass through a 200 me...

Embodiment 1

[0032] Embodiment 1 prepares silicon nitride vanadium microalloy with the inventive method

[0033] Ferrovanadium and ferrosilicon with a particle size of -200 mesh are used as raw materials, and the ratio of silicon and vanadium in ferrovanadium to ferrosilicon is 3:8. A horizontal reaction furnace was adopted, nitrogen gas was introduced into the reaction furnace at a rate of 3 L / min, the temperature was raised to 1200°C, and the reaction was carried out for 3 hours to obtain silicon vanadium nitride. Among them, the N content is 26.14%, the V content is 38.34%, and the Si content is 15.56%. Add 0.5 kg of the alloy of Example 1 per ton of steel, and the yield strength of the obtained vanadium-containing steel reaches 640 MPa, which meets the enterprise standard.

Embodiment 2

[0034] Embodiment 2 prepares silicon nitride vanadium microalloy with the inventive method

[0035] Ferrovanadium and ferrosilicon with a particle size of -200 mesh are used as raw materials, and the ratio of silicon to vanadium in ferrovanadium and ferrosilicon is 2.5:8. A horizontal reaction furnace was adopted, nitrogen gas was introduced into the reaction furnace at a rate of 3 L / min, the temperature was raised to 1300°C, and the reaction was carried out for 4 hours to obtain silicon vanadium nitride. Among them, the N content is 23.48%, the V content is 34.05%, and the Si content is 18.12%. Add 0.5 kg of the alloy of Example 2 per ton of steel, and the yield strength of the obtained vanadium-containing steel reaches 628 MPa, which meets the enterprise standard.

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of a silicon-vanadium nitride microalloy. The silicon-vanadium nitride microalloy and the preparation method thereof are provided according to the problems that a silicon-vanadium nitride microalloy prepared by an existing method is instable in ingredient, poor in performance and the like. The preparation method of the silicon-vanadium nitride microalloy comprises the following steps that a, ferrovanadium powder and ferrosilicon powder are matched according to the weight ratio being (2.5-3.0):(7.0-8.0) and mixed uniformly; and b, a hydraulic sample preparation machine is adopted for press forming, a mixture is put in a heating furnace to carry out a nitridation synthesis reaction, and the silicon-vanadium nitride microalloy is prepared. The preparation method of the silicon-vanadium nitride microalloy is simple in process, reaction conditions are not strict, raw materials are easy to obtain, and the silicon-vanadium nitride microalloy accurate and controllable in ingredient can be prepared and obtained; and the recovery rate of vanadium is obviously increased, the vanadium content in the prepared silicon-vanadium nitride microalloy reaches 30% to 50%, the alloy performance is more excellent, and obvious economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a silicon nitride vanadium microalloy and a preparation method thereof. Background technique [0002] Since the discovery of the excellent comprehensive strengthening effect of vanadium and nitrogen in steel, metallurgical scientists have carried out a series of theoretical and practical studies. At present, vanadium iron and vanadium nitrogen have become microalloying materials commonly used in the field of high-strength steel bars. Research by the General Iron and Steel Research Institute has shown that when the steel contains an appropriate amount of vanadium, increasing nitrogen can reduce the particle size of V(CN) (vanadium carbonitride) and significantly increase the volume fraction of fine V(CN) precipitates, thereby Significantly improve the strength of vanadium nitrogen microalloyed steel bars. When the V / N ratio reaches the ideal stoichiometric ratio, v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C27/02C22C30/00C22C32/00
CPCC22C1/10C22C27/025C22C30/00C22C32/0068
Inventor 唐红建潘成杜光超景涵
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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