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Method for preparing nitrided ferrovanadium alloy

A nitriding reaction technology of vanadium-iron alloy, applied in the field of preparing vanadium-iron alloy, can solve the problems of complicated process and low nitrogen content, achieve simple process, reduce the content of impurity elements, and improve the effect of purity

Active Publication Date: 2018-02-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also has problems such as complex process and low nitrogen content.

Method used

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  • Method for preparing nitrided ferrovanadium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh 95.6g of vanadium trioxide, 27.6g of graphite and 35g of iron powder, and grind them to a particle size of 100-200μm. Put the above-mentioned materials in a mixer and mix them into a cake press to form a block , The pressure is 12MPa;

[0042] (2) Put the bulk material obtained in step (1) into a pusher kiln after drying and sieving for firing. The preheating stage temperature is 500°C and the time is 5h. The carbonization reaction stage temperature is 900°C and the time is 6h, then pass in nitrogen, control the nitrogen flow to 250m 3 / h, the temperature is increased to 1400℃ for the first nitridation reaction, after 10h, the temperature is reduced to 1200℃ for the second nitridation reaction, and the nitrogen flow rate is controlled to 350m 3 / h, after 12 hours of reaction, cooling (the shell of the pusher kiln is equipped with a water cooling jacket) to obtain a vanadium iron nitride alloy, the upper temperature of the cooling section is 800℃, and the lower tem...

Embodiment 2

[0045] (1) Weigh 95.6g of vanadium trioxide, 25.3g of graphite and 30g of iron powder, and grind them to a particle size of 100-200μm. Put the above-mentioned materials in a mixer and mix them into a cake press to form a block , The pressure is 13MPa;

[0046] (2) Put the bulk material obtained in step (1) into a pusher kiln after drying and sieving for firing. The preheating stage temperature is 500°C and the time is 5h. The carbonization reaction stage temperature is 900°C and the time is 6h, then pass in nitrogen, control the nitrogen flow to 250m 3 / h, the temperature is increased to 1450℃ for the first nitridation reaction, after holding for 11h, the temperature is lowered to 1250℃ for the second nitridation reaction, while controlling the nitrogen flow rate to 400m 3 / h, after 13 hours of reaction, cooling (the shell of the pusher kiln is equipped with a water cooling jacket) to obtain a vanadium iron nitride alloy, the upper temperature of the cooling section is 800℃, and t...

Embodiment 3

[0049] (1) Weigh 95.6g of vanadium trioxide, 32.2g of graphite, and 30g of iron powder, and grind them to a particle size of 100-200μm. Put the above-mentioned materials in a mixer and mix them into a cake press to form a block , The pressure is 15MPa;

[0050] (2) The block material obtained in step (1) is dried and sieved and then put into a pusher kiln for firing. The temperature in the preheating stage is 500℃ and the time is 5h. The temperature in the carbonization reaction stage is 850℃ and the time is 6h, then pass in nitrogen, control the nitrogen flow to 150m 3 / h, the temperature is raised to 1300℃ for the first nitridation reaction, after 10h the temperature is reduced to 1200℃ for the second nitridation reaction, and the nitrogen flow rate is controlled to 350m 3 / h, after 11 hours of reaction, cooling (the shell of the pusher kiln is equipped with a water cooling jacket) to obtain a vanadium iron nitride alloy, the upper temperature of the cooling section is 850℃, and...

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Abstract

The invention relates to a method for preparing a vanadium nitride iron alloy. The method comprises the steps that a vanadium source, a carbonaceous reducing agent and iron powder are mixed and then pressed into bulk materials; the bulk materials are heated and subjected to a carbonization reaction, then the temperature rises 1300-1500 DEG C under the nitrogen atmosphere for a first-time nitridingreaction; and after heat preservation is finished, the temperature is reduced to 1100-1300 DEG C for a second-time nitriding reaction, and the vanadium nitride iron alloy is obtained after the reaction. According to the method for preparing the vanadium nitride iron alloy, the two-step nitriding method is utilized to prepare high-nitrogen vanadium nitride iron, and the vanadium nitride iron withthe nitrogen content being 14.0-15.5 wt% is prepared by adjusting the temperature and the nitrogen flow rate; and at the same time, the purity of products is effectively improved, the contents of impurity elements such as oxygen and carbon are reduced, and vanadium nitride iron products with the greater proportion and the better quality are obtained. The method for preparing the vanadium nitride iron alloy is simple in process, common in used equipment and low in energy consumption in the preparing process of the vanadium nitride iron, and has good application prospects.

Description

Technical field [0001] The invention relates to the field of alloy preparation, in particular to a method for preparing a vanadium iron nitride alloy. Background technique [0002] Nitrogen has an excellent strengthening effect on carbonitride precipitation in microalloyed steel. Nitrogen increase in steel has the following effects: (1) It can significantly improve the toughness and plasticity of steel. (2) The thermal strength and creep ability of steel can also be improved. (3) The interphase distribution of vanadium can be changed. (4) The durability of steel can be improved. At present, the methods of nitriding in steel mainly include adding iron vanadium nitride, vanadium nitride, iron vanadium, nitrogen-rich ferromanganese, and iron silicon nitride. [0003] Ferro-vanadium nitride is a new type of vanadium-nitrogen alloy additive with better performance than ferro-vanadium and vanadium nitride. It is widely used in high-strength rebar, high-strength pipeline steel, high-s...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C1/05C22C29/16
CPCC22C1/055C22C29/16C22C35/00
Inventor 李兰杰李九江董自慧吴春亮王娜张苏新柳朝阳
Owner HEBEI IRON AND STEEL
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