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Method for preparing nitrided ferrovanadium

A technology of ferrovanadium nitride and ferrovanadium powder, which is applied in the field of preparation of ferrovanadium nitride, can solve the problems of unfavorable absorption of alloy elements, easy floating on molten steel, low apparent density, etc., and achieves environmental pollution-free, product quality The effect of stable production and accurate process control

Inactive Publication Date: 2014-07-23
陈治勇
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of the above two ferrovanadium nitrides are complicated in process and low in apparent density. During steelmaking, ferrovanadium nitride is easy to float on the molten steel, which is not conducive to the absorption of alloying elements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0008] 1. Crush ferrovanadium into powder of more than 60 meshes, mix evenly with water glass at a ratio of 100:6, briquette, shape, place in a temperature-resistant container, and push the material container into a vacuum tube resistance furnace , sealed vacuum tube resistance furnace;

[0009] 2. Use a high-vacuum vacuum pump to pump the vacuum in the furnace to 10Pa;

[0010] 3. Put the high-purity nitrogen source (N 2 ≥99.99%) to fill nitrogen into the vacuum smelting furnace, adjust the filling rate at 20L / min through the flow meter and control valve, and finally control the atmosphere pressure in the furnace to 0.15-0.25Mpa;

[0011] 4. Heat up the vacuum tube resistance furnace to 900°C, hold the heat at the aforementioned pressure and temperature for sintering and nitriding for 4 hours, then gradually cool to 190°C, open the furnace door, and take out the materials.

[0012] When the material is cooled to room temperature, the nitrogen content is 11.6%, and the appar...

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Abstract

The invention discloses a method for preparing nitrided ferrovanadium. The method disclosed by the invention comprises the following steps: evenly mixing ferrovanadium powder with water glass serving as a binder according to a certain ratio, then pressing and molding; putting into a vacuumized vacuum tube type resistance furnace, and then charging pure nitrogen into the vacuum tube type resistance furnace at a certain speed; simultaneously, electrifying and heating the vacuum tube type resistance furnace to 800-950 DEG C for sintering and nitriding and then gradually cooling to obtain the product. According to the nitrided ferrovanadium prepared by the method disclosed by the invention, the nitrogen content can be over 10% and the apparent density can be over 3.5g / cm<3>; in addition, the method is low in energy consumption, and accurate in process control, stable in product production and free of pollution to environment.

Description

technical field [0001] The invention relates to a preparation method of ferrovanadium nitride. Background technique [0002] Ferrovanadium nitride is a new type of vanadium-nitrogen alloy additive. Its performance is superior to that of ferrovanadium and vanadium nitride. It can be widely used in high-strength threaded steel bars, high-strength pipeline steel, high-strength section steel (H-beam, I-beam, channel steel, etc.) , angle steel), thin slab continuous casting and rolling high-strength steel strip, non-quenched and tempered steel, high-speed tool steel and other products. [0003] The preparation methods of ferrovanadium nitride mainly include liquid nitriding method and solid state nitriding method. The liquid nitriding method is to put the qualified ferrovanadium melt smelted in the electric furnace into the ladle with bottom gas transfer, and at the same time, nitrogen gas is introduced to carry out liquid nitriding. The solid-state nitriding method is to use f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C35/00
Inventor 陈治勇
Owner 陈治勇
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