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Vanadium nitrogen microalloy additive and its preparing method

A micro-alloy additive, vanadium nitrogen technology, applied in the field of metal additives, can solve the problems of demanding reaction equipment, large equipment loss, high manufacturing cost, etc., and achieve the effects of improving labor productivity, reducing equipment investment, and shortening the reaction cycle

Inactive Publication Date: 2004-03-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are usually methods for increasing nitrogen in steel: 1) adding nitrogen-rich ferromanganese; 2) adding calcium cyanamide, 3) blowing nitrogen; 4) using ferrovanadium nitride, these methods have disadvantages: method 1) expensive ; Method 2) yield is low and unstable; Method 3) needs special device when blowing nitrogen; Method 4) first produces ferrovanadium, then solid-state nitriding obtains ferrovanadium nitride, and the manufacturing cost is high
[0005] Disadvantages of high-temperature vacuum carbon reduction method: strict requirements on reaction equipment, high temperature strength requirements of equipment materials; cannot be carried out continuously, and the preparation process is too long; too long reaction cycle leads to low labor productivity; too long reaction cycle causes energy consumption Too large; the long-term high-temperature process will cause a large loss of equipment; the one-time investment of equipment is large, the production cost is high, and the product competitiveness is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of Vanadium Nitrogen Microalloy Additives Using Ammonium Vanadate as Raw Material

[0039] After drying and grinding the ammonium vanadate through a standard sieve, select the ammonium vanadate with a particle size of 120 mesh and add a reducing agent. This implementation example selects elemental graphite as the reducing agent, and its dosage is based on the following reaction equation, prepared according to the stoichiometric ratio, and properly adjusts the amount of carbon,

[0040] After adding 5% density enhancer, it is fully sieved and mixed by a vibrating sieve, and then hydraulically formed, the forming pressure is 2Mpa ~ 30Mpa, and the sample size after forming is 1×2×5cm 3 , After the molded sample is dried, put it into the reaction furnace, feed flowing nitrogen gas, raise the temperature to 650°C, keep it warm for 2 hours, then raise the temperature to 1300-1450°C, keep it warm for 24 hours, cool it under the protection of f...

Embodiment 2

[0041] Preparation of Vanadium Nitrogen Microalloy Additives Using Vanadium Trioxide as Raw Material

[0042] After the vanadium trioxide after drying and grinding is sieved by a standard sieve, the vanadium trioxide with a particle size of 140 mesh is selected to be added with activated carbon reducing agent. And properly adjust the amount of carbon,

[0043] After adding 3% density enhancer, use 2% binder, mix thoroughly and then form, the forming pressure is 1300Pa~1400Pa, and the sample size after forming is 1×2×5cm 3 , after being dried at 150°C, enter the high temperature furnace. The nitrogen pressure is 0.3-0.5Mpa, and the nitrogen flow rate is 0.2m 3 / h·kg, the temperature in the furnace is controlled at 1400-1450°C, and the finished product is obtained after cooling. The amount of V in the product: 77.45% to 78.80%, the amount of C: 1.123% to 3.411%, the amount of N: 10.85% to 14.51%, the amount of S ≤ 0.01% to 0.005%, the amount of O ≤ 0.5%, im...

Embodiment 3

[0044] Preparation of vanadium-nitrogen microalloy additives from vanadium pentoxide

[0045] The vanadium pentoxide after drying and grinding is screened by a standard sieve, and the vanadium pentoxide with a particle size of 120 mesh is selected to add a reducing agent. This implementation example selects elemental graphite reducing agent, and its dosage is based on the following reaction equation, prepared according to the chemical reaction stoichiometric ratio, and properly adjusts the amount of carbon,

[0046] After adding 5% density enhancer, it is fully sieved and mixed by a vibrating sieve, and then hydraulically formed, the forming pressure is 2MPa~30MPa, and the sample size after forming is 1×2×5cm 3 , After the molded sample is dried, it is put into a high-temperature reaction furnace, and flowing nitrogen gas is introduced, and the temperature is raised to 650°C. After 2 hours of heat preservation, the temperature is raised to 1350-1400°C. After...

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Abstract

A V-N microalloying additive is prepared from vanadate or vanadium oxide, carbon reducing agent, and density intensifier through die pressing to become blocks, loading in high-temp furnace, introducing N2, and reduction reacting which nitrifying. It contains V (77-82%), nitrogen (11-16%) and C (2-7%).

Description

Technical field [0001] The invention belongs to a metal additive, in particular to a method for preparing a vanadium-nitrogen microalloy additive. Background technique [0002] The main use of vanadium is as an alloy additive for the metallurgical industry. A large number of industrial-scale application data show that increasing the nitrogen content in vanadium-containing steel can increase the yield strength of the steel. The main reason is that the increase in nitrogen content in the steel reduces the growth of precipitates. Contrary to the trend of coarsening, after the addition of nitrogen in the steel, the precipitated phase particles become finer, thus giving full play to the role of vanadium in the steel. In high-strength low-alloy steels, the use of vanadium-nitrogen microalloy additives can effectively strengthen and refine grains. At a specified strength level, nitrogen addition in steel can save vanadium consumption. Generally speaking, compared with ferrovanadium...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C35/00
Inventor 隋智通陈厚生卢志玉罗冬梅刘亮
Owner NORTHEASTERN UNIV
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