A kind of preparation method of vanadium nitrogen alloy

Abstract

The invention relates to a preparation method of a vanadium-nitrogen alloy and belongs to the technical field of vanadium-nitrogen alloys. The method comprises the following steps: 1) a vanadium-nitrogen compound is smashed and uniformly mixed with a reducing agent, a nitrogen increasing agent and a catalyst in proportion, and the substances are stirred for 1.5-3 h; a binder and water are mixed uniformly in proportion; the two mixtures are mixed uniformly for standby application; 2) the finally obtained mixture in step 1) is pressed for the first time and subjected to second pressing forming under pressure higher than the first pressing pressure, a formed pressed product is naturally air-dried; 3) the pressed product air-dried in step 2) is subjected to drying, reduction, carbonization nitriding and nitrification sintering, and the vanadium-nitrogen alloy is obtained. Stirring time after raw materials are mixed with water can be shortened effectively, the binder is dissolved completelyand plays the binding role sufficiently, one-time pelletizing rate is increased, initial strength of pellets is improved, and curing effect is improved; surface quality and grade of vanadium-nitrogenare improved.

Description

technical field

[0001] The invention relates to the technical field of vanadium-nitrogen alloys, in particular to a preparation method of vanadium-nitrogen alloys. Background technique

[0002] Vanadium-nitrogen alloy, namely vanadium nitride, 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 effectively improve the strength, toughness, ductility and heat resistance of steel Comprehensive mechanical properties such as fatigue resistance, and make steel have good weldability.

[0003] However, in the production process of vanadium-nitrogen alloys, the surface quality of vanadium-nitrogen alloys is often poor, cracks, adhesions, and the grade of vanadium-nitrogen alloys fluctuate greatly. For example, Chinese patent application CN103388101A discloses a vanadium-nitrogen microalloy additive and a preparation method, including: 1) grinding the vanadium compound through a mill; 2) mixin...

Examples

Embodiment 1

[0052] A preparation method of a vanadium nitrogen alloy, comprising the steps of:

[0053] (1) Add 1000 parts of vanadium pentoxide (200 mesh), 299 parts of flake graphite powder, 10 parts of ferrosilicon, and 5 parts of Fe powder into a conical mixer and mix well; then add 1.5 parts of binder sodium silicate , 70 parts of water are mixed and stirred evenly in the mixing tank, the stirring time is 2h, then the above two mixtures are added to the wheel mill mixer, the stirring time is 2 hours, and set aside;

[0054] (2) First, the mixture finally obtained in step (1) is added to the ball making machine, and the first pressing is carried out under the pressure of 10MPa, and then the second pressing is carried out under the pressure of 13MPa, and the formed pressed product is Naturally dry for 3 days;

[0055] (3) carry out drying, reduction, carbonitriding, nitriding sintering to the pressed product dried in step (2) under protective gas atmosphere, described drying temperatu...

Embodiment 2

[0057] (1) Add 1,000 parts of vanadium pentoxide (200 mesh), 299 parts of flake graphite powder, 20 parts of ferrosilicon, and 3.5 parts of ferric oxide powder into a conical mixer and mix well, and the stirring time is 1.5h; then Mix 1.5 parts of sodium silicate as a binder and 70 parts of water and stir evenly, then add the above two mixtures into the wheel mill mixer, and the stirring time is 2 hours, and set aside;

[0058] (2) First, the mixture finally obtained in step (1) is added to the ball making machine, and the first pressing is carried out under a pressure of 12MPa, and then the second pressing is carried out under a pressure of 15MPa, and the formed pressed product is Naturally dry for 5 days;

[0059] (3) carry out drying, reduction, carbonitridation, nitriding sintering to the pressed product dried in step (2) under protective gas atmosphere, described drying temperature is 100 ℃, and drying time is 12 hours, and described reducing is at 450°C-600°C for 6 hour...

Embodiment 3

[0061] A preparation method of a vanadium nitrogen alloy, comprising the steps of:

[0062] (1) 1000 parts of vanadium trioxide (250 orders), 240 parts of carbon black powder, 15 parts of silicon powder, 2.4 parts of iron ferric oxide powder are added into the conical mixer and fully mixed, and the stirring time is 2 hours; then Mix 2 parts of the binder sodium silicate and 80 parts of water and stir evenly, then add the above two mixtures into the wheel mill mixer, the stirring time is 2.5 hours, and set aside;

[0063] (2) First, the mixture finally obtained in step (1) is added into the ball making machine, the first pressing is carried out under the pressure of 11MPa, and then the second pressing is carried out under the pressure of 14MPa, and the formed pressed product is Naturally dry for 4 days;

[0064] (3) carry out drying, reduction, carbonitriding, nitriding sintering to the pressed product dried in step (2) under protective gas atmosphere, described drying tempera...

technical field

[0001] The invention relates to the technical field of vanadium-nitrogen alloys, in particular to a preparation method of vanadium-nitrogen alloys. Background technique

[0002] Vanadium-nitrogen alloy, namely vanadium nitride, 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 effectively improve the strength, toughness, ductility and heat resistance of steel Comprehensive mechanical properties such as fatigue resistance, and make steel have good weldability.

[0003] However, in the production process of vanadium-nitrogen alloys, the surface quality of vanadium-nitrogen alloys is often poor, cracks, adhesions, and the grade of vanadium-nitrogen alloys fluctuate greatly. For example, Chinese patent application CN103388101A discloses a vanadium-nitrogen microalloy additive and a preparation method, including: 1) grinding the vanadium compound through a mill; 2) mixin...

Examples

Embodiment 1

[0052] A preparation method of a vanadium nitrogen alloy, comprising the steps of:

[0053] (1) Add 1000 parts of vanadium pentoxide (200 mesh), 299 parts of flake graphite powder, 10 parts of ferrosilicon, and 5 parts of Fe powder into a conical mixer and mix well; then add 1.5 parts of binder sodium silicate , 70 parts of water are mixed and stirred evenly in the mixing tank, the stirring time is 2h, then the above two mixtures are added to the wheel mill mixer, the stirring time is 2 hours, and set aside;

[0054] (2) First, the mixture finally obtained in step (1) is added to the ball making machine, and the first pressing is carried out under the pressure of 10MPa, and then the second pressing is carried out under the pressure of 13MPa, and the formed pressed product is Naturally dry for 3 days;

[0055] (3) carry out drying, reduction, carbonitriding, nitriding sintering to the pressed product dried in step (2) under protective gas atmosphere, described drying temperatu...

Embodiment 2

[0057] (1) Add 1,000 parts of vanadium pentoxide (200 mesh), 299 parts of flake graphite powder, 20 parts of ferrosilicon, and 3.5 parts of ferric oxide powder into a conical mixer and mix well, and the stirring time is 1.5h; then Mix 1.5 parts of sodium silicate as a binder and 70 parts of water and stir evenly, then add the above two mixtures into the wheel mill mixer, and the stirring time is 2 hours, and set aside;

[0058] (2) First, the mixture finally obtained in step (1) is added to the ball making machine, and the first pressing is carried out under a pressure of 12MPa, and then the second pressing is carried out under a pressure of 15MPa, and the formed pressed product is Naturally dry for 5 days;

[0059] (3) carry out drying, reduction, carbonitridation, nitriding sintering to the pressed product dried in step (2) under protective gas atmosphere, described drying temperature is 100 ℃, and drying time is 12 hours, and described reducing is at 450°C-600°C for 6 hour...

Embodiment 3

[0061] A preparation method of a vanadium nitrogen alloy, comprising the steps of:

[0062] (1) 1000 parts of vanadium trioxide (250 orders), 240 parts of carbon black powder, 15 parts of silicon powder, 2.4 parts of iron ferric oxide powder are added into the conical mixer and fully mixed, and the stirring time is 2 hours; then Mix 2 parts of the binder sodium silicate and 80 parts of water and stir evenly, then add the above two mixtures into the wheel mill mixer, the stirring time is 2.5 hours, and set aside;

[0063] (2) First, the mixture finally obtained in step (1) is added into the ball making machine, the first pressing is carried out under the pressure of 11MPa, and then the second pressing is carried out under the pressure of 14MPa, and the formed pressed product is Naturally dry for 4 days;

[0064] (3) carry out drying, reduction, carbonitriding, nitriding sintering to the pressed product dried in step (2) under protective gas atmosphere, described drying tempera...

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