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Nitrided ferrovanadium alloy and preparing method thereof

A technology for nitriding ferrovanadium and iron oxides, which is applied in the field of ferrovanadium nitride and its preparation, can solve the problems of complex ferrovanadium nitride process, long reaction time, increased cost and the like, and achieves shortened reaction time, simplified process, The effect of reducing the production cost

Active Publication Date: 2016-04-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods use vanadium-iron alloy as raw material, and nitrogen gas is introduced under a certain temperature and pressure for nitriding reaction, but the reaction time of this method is too long, the amount of nitriding is low, and the energy consumption is too large, resulting in the production of vanadium nitride. The iron process is complicated and the cost is too high, which increases the cost of producing high-strength steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] V2O5, Fe2O3 and activated carbon are used as raw materials, a total of 30g, and the raw materials are all powder samples with a particle size of less than 100 mesh. In this embodiment, according to the content of V2O5 and Fe2O3 added to the target alloy, combined with the chemical equation: V2O5+5C=2V+5CO, Fe2O3+3C=2Fe+3CO, the mass of activated carbon required is calculated. Then use a stirrer to stir for 40 minutes to mix the prepared raw materials evenly, press the block under the pressure of 6MPa, and press it into a columnar body of φ18*10.

[0027] Put the block sample into a high-temperature furnace, feed nitrogen into the furnace at a rate of 500ml / min, raise the temperature to 650°C at a rate of 5°C / min, hold for 2 hours, continue to heat up to 1500°C, hold for 3 hours, and then cool down to 1100°C ℃, heat preservation 3h; because V2O5 is easy to volatilize at about 700 ℃ and cause the loss of vanadium, so this embodiment is heat preservation 2h at low temperat...

Embodiment 2

[0029] V2O5, Fe2O3 and activated carbon are used as raw materials, a total of 30g, and the raw materials are all powder samples with a particle size of less than 100 mesh. In this embodiment, according to the content of V2O5 and Fe2O3 added to the target alloy, combined with the chemical equation: V2O5+5C=2V+5CO, Fe2O3+3C=2Fe+3CO, the mass of activated carbon required is calculated. Then use a stirrer to stir for 40 minutes to mix the prepared raw materials evenly, press the block under the pressure of 6MPa, and press it into a columnar body of φ18*10.

[0030] Put the block sample into a high-temperature furnace, feed nitrogen into the furnace at a rate of 500ml / min, raise the temperature to 650°C at a rate of 5°C / min, hold for 2 hours, continue to heat up to 1500°C, hold for 3 hours, and then cool down to 1100°C ℃, keep warm for 3h. The grade of the alloy obtained in this embodiment is FeV45N10, wherein the nitrogen content is 9.1%.

Embodiment 3

[0032] Using V2O3, FeO and graphite as raw materials, a total of 30g, the raw materials are all powder samples with a particle size of less than 100 mesh. In this embodiment, according to the contents of V2O3 and FeO added to the target alloy, combined with the chemical equation: V2O3+3C=2V+3CO, FeO+C=Fe+CO, the mass of graphite required is calculated. Then use a stirrer to stir for 15 minutes to mix the prepared raw materials evenly, press the block under the pressure of 20MPa, and press it into a columnar body of φ18*10.

[0033] Put the block sample into a high-temperature furnace, feed nitrogen into the furnace at a rate of 800ml / min, raise the temperature to 1300°C at a rate of 5°C / min, hold for 10 hours, then cool down to 1000°C, and hold for 10 hours. The grade of the alloy obtained in this embodiment is FeV45N10, wherein the nitrogen content is 12.8%.

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Abstract

The invention relates to a nitrided ferrovanadium alloy and a preparing method thereof, and belongs to the material preparing field. According to the method, vanadium oxide, iron oxide or iron and a carbonaceous reducing agent serve as raw materials, the raw materials are mixed according to the proportion and placed in a high-temperature furnace, the nitrogen atmosphere is introduced, the high temperature reaction is carried out to obtain nitrided ferrovanadium, and the high-temperature reaction comprises the high-temperature carbon thermal reduction stage and the medium-temperature nitriding reaction stage, wherein the purity of the nitrided ferrovanadium alloy is larger than 98%, and the nitrogen content is 9-15%. The preparing technology is shortened, and the preparing cost is reduced. The purity and the nitrogen content of the nitrided ferrovanadium are improved by controlling raw material and technology parameters.

Description

technical field [0001] The invention belongs to the field of ferroalloy preparation, and in particular relates to ferrovanadium nitride and a preparation method thereof. Background technique [0002] my country is a country rich in vanadium resources, with abundant vanadium-bearing shale resources, and its total reserves rank first in the world. With the rapid development of my country's iron and steel industry, the demand for high-quality steel is also increasing. As an important alloy additive for high-strength micro-alloyed steel, the demand for ferrovanadium nitride is also increasing. Ferrovanadium nitride can effectively use nitrogen to optimize the precipitation state of vanadium, enhance the effect of precipitation strengthening and fine-grain strengthening, and therefore optimize the performance of steel. Current studies have found that adding ferrovanadium nitride alloys to steel can improve the strength, toughness, wear resistance, corrosion resistance and therma...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C29/16C22C1/10
CPCC22C1/10C22C29/16C22C35/00
Inventor 张国华吴跃东周国治
Owner UNIV OF SCI & TECH BEIJING
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