Production method of vanadium-nitrogen alloy

A technology of vanadium nitrogen alloy and production method, which is applied in the field of metallurgy, can solve the problems of vanadium trioxide being unstable in normal state, demanding temperature control, and low melting point of vanadium pentoxide, etc., and achieves low production cost, low temperature control requirements, The effect of stable production process

Inactive Publication Date: 2015-05-13
湖南汉瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a production method of vanadium-nitrogen alloy, which solves the problems of low vanadium pentoxide melting point, strict temperature control requirements, unstable normal state of vanadium trioxide and easy oxidation in the existing vanadium-nitrogen synthesis production process

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the tunnel kiln, the mixed gas of nitrogen and hydrogen is continuously fed, the pressure of nitrogen and hydrogen is 0.5MPa, and the flow rate of nitrogen is 4m 3 / h, hydrogen flow rate is 6.5m 3 / h, put 1000kg of vanadium pentoxide into the tunnel kiln and reduce it to 912kg of vanadium tetroxide. The temperature of the tunnel kiln is 400°C, and the holding time is 4 hours; The dry powder pressing ball is carried out on the machine, the feeding speed of the rolling ball machine is 3000kg / h, the forming pressure of the rolling ball machine is 80Mpa, and the ellipsoid billet with a diameter of 30mm and a thickness of 10mm is produced, and the formed billet is put into the intermediate frequency vertical In the furnace, vacuumize the intermediate frequency furnace to 280pa, heat it to 1000°C at the same time, and keep it warm for 2 hours; fill the furnace with nitrogen to ensure a positive pressure of 0.8Mpa, raise the temperature to 1400°C in a nitrogen environment, ...

Embodiment 2

[0030] In the tunnel kiln, the mixed gas of nitrogen and hydrogen is continuously fed, the pressure of nitrogen and hydrogen is 0.5MPa, and the flow rate of nitrogen is 4.5m 3 / h, hydrogen flow rate is 7m 3 / h, put 1000kg of vanadium pentoxide into the tunnel kiln and reduce it to 912kg of vanadium tetroxide. The temperature of the tunnel kiln is 450°C, and the holding time is 4 hours; The dry powder pressing ball is carried out on the machine, the feeding speed of the rolling ball machine is 3000kg / h, the forming pressure of the rolling ball machine is 60Mpa, the formed billet is put into the intermediate frequency shaft furnace, and the intermediate frequency furnace is vacuumed to 280pa, At the same time, heat to 1000°C and keep it warm for 2 hours; fill the furnace with nitrogen to ensure a positive pressure of 0.8Mpa, raise the temperature to 1200-1500°C in a nitrogen environment, and keep it warm for 4 hours. This process mainly occurs carbonization reaction to generate ...

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Abstract

The invention provides a production method of a vanadium-nitrogen alloy. The method comprises the following steps of: a) reducing vanadium pentoxide to vanadium tetraoxide; b) adding carbon powder into vanadium tetraoxide and then carrying out dry powder extrusion on the resulting mixture for ball forming; and c) feeding the formed ball into a medium frequency vertical furnace, vacuumizing the furnace to be lower than 300Pa, and heating the ball inside the furnace to 1000 DEG C, introducing nitrogen into the furnace, preserving the positive pressure of 0.8-1.0MPa, increasing the temperature to 1200-1500 DEG C, and preserving heat for 3-5 hours; preserving the positive pressure of the nitrogen to 0.3-0.5MPa, increasing the temperature to 1500-1600 DEG C, and preserving heat for 1 hour; at last cooling the material to be lower than 200 DEG C and discharging the material, wherein the product is the vanadium-nitrogen alloy. The method conquers the defects that vanadium pentoxide is low in melting point, temperature control demand is strict, vanadium trioxide is unstable in normal state and is easily oxidized in the existing vanadium-nitrogen synthesis production process, and is relatively loose in temperature control demand, simple in equipment, good in product quality, stable in production process, and low in production cost.

Description

technical field [0001] The invention relates to a production method of a novel steel additive-vanadium-nitrogen alloy, which belongs to the technical field of metallurgy. Background technique [0002] Vanadium-nitrogen alloy is a new type of alloy additive that can replace ferro-vanadium for the production of micro-alloyed steel. Adding vanadium nitride to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance. It also makes the steel have good weldability, and at the same strength, the addition of vanadium nitride saves 30-40% of the amount of vanadium added, thereby reducing the cost. In recent years, due to the obvious technical and economic advantages of vanadium-nitrogen microalloying technology, vanadium-nitrogen microalloys have been used in high-strength steel bars, non-quenched and tempered steels, high-strength strips, CSP products, high-strength thick plates and thick-walled H-beams,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/16C22C1/10
Inventor 葛广凯喻华戴红梅
Owner 湖南汉瑞新材料科技有限公司
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