阅读说明：本技术 一种复合钒氮合金及其制备方法 (Composite vanadium-nitrogen alloy and preparation method thereof ) 是由 陈邦锋 刘建华 金小玉 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种复合钒氮合金及其制备方法,该复合钒氮合金按重量百分比包括如下组份：钒碳物料28-32％,硅铁粉38-42％,锌粉8-12％,氮气16-19％,粘结剂,复合钒氮合金的制备方法包括制备钒碳物料步骤和制备复合钒氮合金步骤；本发明中的复合钒氮合金可以摆脱对“钒”元素的高度依赖,减少资源浪费,同时加入充足的氮元素和锌元素,创造经济效益,并且具备电化学抗氧化、耐腐蚀性能,能够提高钢材机械性能。(The invention discloses a composite vanadium-nitrogen alloy and a preparation method thereof, wherein the composite vanadium-nitrogen alloy comprises the following components in percentage by weight: 28-32% of vanadium-carbon material, 38-42% of ferrosilicon powder, 8-12% of zinc powder, 16-19% of nitrogen and a binder, wherein the preparation method of the composite vanadium-nitrogen alloy comprises the steps of preparing the vanadium-carbon material and preparing the composite vanadium-nitrogen alloy; the composite vanadium-nitrogen alloy can get rid of high dependence on vanadium, reduce resource waste, and simultaneously add sufficient nitrogen and zinc to create economic benefits, and has electrochemical oxidation resistance and corrosion resistance, and can improve the mechanical properties of steel.)

1. A composite vanadium-nitrogen alloy is characterized in that: the composite vanadium-nitrogen alloy comprises the following components in percentage by weight: 28-32% of vanadium-carbon material, 38-42% of ferrosilicon powder, 8-12% of zinc powder, 16-19% of nitrogen and a binder.

2. The composite vanadium-nitrogen alloy according to claim 1, characterized in that: the vanadium-carbon material is prepared by smelting vanadium pentoxide and carbon powder in an intermediate-frequency smelting furnace, and carrying out reduction reaction to generate a vanadium simple substance and carbon powder.

3. The composite vanadium-nitrogen alloy according to claim 2, characterized in that: the weight ratio of the vanadium pentoxide to the carbon powder is 4-7: 1-3.

4. The composite vanadium-nitrogen alloy according to claim 3, characterized in that: the binder is inorganic sodium silicate; the ferrosilicon powder is 75 ferrosilicon powder.

5. The method for preparing the composite vanadium-nitrogen alloy as claimed in any one of claims 1 to 4, wherein the method comprises the following steps: the preparation method specifically comprises the steps of preparing a vanadium-carbon material and preparing a composite vanadium-nitrogen alloy;

the vanadium-carbon material preparation steps comprise:

s1, firstly, selecting vanadium pentoxide, carbon powder and inorganic sodium silicate, wherein the ratio of the vanadium pentoxide to the carbon powder is 4-7:1-3, and the content of the inorganic sodium silicate is 1-2% of the total weight of the materials;

s2, filling vanadium pentoxide, carbon powder and inorganic sodium silicate into a mixer, and uniformly mixing to obtain a mixture;

s3, pressing the mixture by a press, wherein the pressure of the press is 15-17KPa, and the formed reproduced product is a spheroid;

s4, putting the reproduced product prepared in the step S2 into an intermediate frequency smelting furnace for smelting, and carrying out reduction reaction to generate vanadium-carbon materials;

s5, discharging the vanadium-carbon material obtained in the step S4, pouring the discharged vanadium-carbon material into a cooling mold for cooling for more than 9 hours, and obtaining a mold material after cooling;

and S6, grinding the die material prepared in the step S5 into powder to obtain a powder vanadium-carbon material.

6. The preparation method of the composite vanadium-nitrogen alloy according to claim 5, characterized by comprising the following steps: the preparation method of the composite vanadium-nitrogen alloy comprises the following steps:

f1, mixing 28-32% of vanadium-carbon material, 38-42% of silicon iron powder, 8-12% of zinc powder and 2-4% of binder according to the mixture ratio, and putting the materials into a mixer to be uniformly mixed to obtain a reproduced mixture;

f2, pressing the mixture of the reproduced products by a press, wherein the formed finished product blank is a spheroid;

f3, putting the finished product blank prepared in the step S6 into a vacuum nitriding furnace for vacuum nitriding treatment, and then cooling and crushing to prepare the composite vanadium-nitrogen alloy.

7. The preparation method of the composite vanadium-nitrogen alloy according to claim 6, characterized by comprising the following steps: in the step S4, the smelting temperature in the medium-frequency smelting furnace is 1200-1300 ℃, the temperature rise time is more than 30-40min, and the material of the spheroid is melted into liquid vanadium-carbon material after the smelting temperature in the medium-frequency smelting furnace reaches 1200-1300 ℃.

8. The preparation method of the composite vanadium-nitrogen alloy according to claim 7, characterized by comprising the following steps: the diameter of the powdery vanadium-carbon material prepared in the step S6 is 0.1-1 mm.

9. The method for preparing the composite vanadium-nitrogen alloy according to claim 8, characterized in that: the pressure of the press in step F2 is 15 to 17 KPa.

10. The method for preparing the composite vanadium-nitrogen alloy according to claim 9, which is characterized by comprising the following steps: and F3, after the finished product blank is placed into a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to enable the pressure in the vacuum nitriding furnace to reach 0.020-0.030MPa, then heating to enable the temperature in the vacuum nitriding furnace to reach 500 ℃, injecting industrial nitrogen into the vacuum nitriding furnace, enabling the flow of the nitrogen to be 200 plus 300ml/min, continuously heating to raise the temperature, continuously introducing the nitrogen, stopping heating after the temperature in the vacuum nitriding furnace reaches 800 ℃, keeping the temperature for 2 hours, continuing heating to raise the temperature after the temperature is kept, enabling the temperature in the vacuum nitriding furnace to reach 1450 ℃, keeping the temperature for 2 hours, closing the nitrogen after the temperature is kept, and then opening the furnace to obtain the composite vanadium-nitrogen alloy.

Technical Field

The invention belongs to the technical field of metallurgy, and particularly relates to a composite vanadium-nitrogen alloy and a preparation method thereof.

Background

At present, in order to improve the mechanical property of steel products, additives commonly used in metallurgy in China are vanadium-nitrogen alloy and novel vanadium-nitrogen microalloy; the vanadium-nitrogen alloy and the novel vanadium-nitrogen microalloy become microalloying processes commonly adopted by high-strength steel, the demand of the microalloy correspondingly increases along with the increase of the demand of the high-strength steel in China, and the more economic vanadium-containing microalloy must be developed by depending on the advantages of vanadium resources in China from the development strategy of the microalloy.

In order to solve the technical problem, a novel vanadium-nitrogen microalloy appears on the market, and the vanadium-nitrogen microalloy has the following patent numbers: CN201910675311.0 discloses a novel vanadium-nitrogen microalloy and a preparation method thereof, wherein the novel vanadium-nitrogen microalloy comprises 100 parts of vanadium compound, 24-39 parts of novel biological carbon reducing agent, 1-3 parts of ammonium bicarbonate or ammonium chloride and 0.1-2 parts of density strength agent by mass. The preparation method comprises grinding vanadium compound with a mill; mixing the novel biological carbon reducing agent with the ground vanadium compound, adding a density enhancer, ammonium bicarbonate or ammonium chloride and water, and uniformly mixing according to a certain proportion; the mixture is pressed to shape.

The invention can produce novel vanadium-nitrogen microalloy, and the novel vanadium-nitrogen microalloy can be used as an additive to be added into the steel smelting process for improving the mechanical property of steel, but the existing products have a plurality of problems in different degrees, such as: the structural proportion of vanadium and nitrogen in the vanadium-nitrogen microalloy is unreasonable, so that a large amount of vanadium is wasted, the cost is increased, and the existing products excessively depend on expensive vanadium, so that the problems of resource waste, cost increase, environmental pollution and the like are caused.

Disclosure of Invention

The invention aims to solve the main technical problem of providing a composite vanadium-nitrogen alloy which can get rid of high dependence on vanadium, reduce resource waste, simultaneously add sufficient nitrogen and zinc elements, create economic benefits, has electrochemical oxidation resistance and corrosion resistance and improves the mechanical properties of steel and a preparation method thereof.

In order to solve the technical problems, the invention provides the following technical scheme:

the composite vanadium-nitrogen alloy comprises the following components in percentage by weight: 28-32% of vanadium-carbon material, 38-42% of ferrosilicon powder, 8-12% of zinc powder, 16-19% of nitrogen and a binder.

The following is a further optimization of the above technical solution of the present invention:

the vanadium-carbon material is prepared by smelting vanadium pentoxide and carbon powder in an intermediate-frequency smelting furnace, and carrying out reduction reaction to generate a vanadium simple substance and carbon powder.

Further optimization: the weight ratio of the vanadium pentoxide to the carbon powder is 4-7: 1-3.

Further optimization: the binder is inorganic sodium silicate; the ferrosilicon powder is 75 ferrosilicon powder.

The invention also provides a preparation method for preparing the composite vanadium-nitrogen alloy, which specifically comprises a step of preparing the vanadium-carbon material and a step of preparing the composite vanadium-nitrogen alloy;

the vanadium-carbon material preparation steps comprise:

s1, firstly, selecting vanadium pentoxide, carbon powder and inorganic sodium silicate, wherein the ratio of the vanadium pentoxide to the carbon powder is 4-7:1-3, and the content of the inorganic sodium silicate is 1-2% of the total weight of the materials;

s2, filling vanadium pentoxide, carbon powder and inorganic sodium silicate into a mixer, and uniformly mixing to obtain a mixture;

s3, pressing the mixture by a press, wherein the pressure of the press is 15-17KPa, and the formed reproduced product is a spheroid;

s4, putting the reproduced product prepared in the step S2 into an intermediate frequency smelting furnace for smelting, and carrying out reduction reaction to generate vanadium-carbon materials;

s5, discharging the vanadium-carbon material obtained in the step S4, pouring the discharged vanadium-carbon material into a cooling mold for cooling for more than 9 hours, and obtaining a mold material after cooling;

and S6, grinding the die material prepared in the step S5 into powder to obtain a powder vanadium-carbon material.

The following is a further optimization of the above technical solution of the present invention:

the preparation method of the composite vanadium-nitrogen alloy comprises the following steps:

f1, mixing 28-32% of vanadium-carbon material, 38-42% of silicon iron powder, 8-12% of zinc powder and 2-4% of binder according to the mixture ratio, and putting the materials into a mixer to be uniformly mixed to obtain a reproduced mixture;

f2, pressing the mixture of the reproduced products by a press, wherein the formed finished product blank is a spheroid;

f3, putting the finished product blank prepared in the step S6 into a vacuum nitriding furnace for vacuum nitriding treatment, and then cooling and crushing to prepare the composite vanadium-nitrogen alloy.

Further optimization: in the step S4, the smelting temperature of the medium-frequency smelting furnace is 1200-1300 ℃, the temperature rise time is more than 30-40min, and the material of the spheroid is melted into liquid vanadium-carbon material after the smelting temperature in the medium-frequency smelting furnace reaches 1200-1300 ℃.

Further optimization: the diameter of the powdery vanadium-carbon material prepared in the step S6 is 0.1-1 mm.

Further optimization: the pressure of the press in step F2 is 15 to 17 KPa.

Further optimization: and F3, after the finished product blank is placed into a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to enable the pressure in the vacuum nitriding furnace to reach 0.020-0.030MPa, then heating to enable the temperature in the vacuum nitriding furnace to reach 500 ℃, injecting industrial nitrogen into the vacuum nitriding furnace, enabling the flow of the nitrogen to be 200 plus 300ml/min, continuously heating to raise the temperature, continuously introducing the nitrogen, stopping heating after the temperature in the vacuum nitriding furnace reaches 800 ℃, keeping the temperature for 2 hours, continuing heating to raise the temperature after the temperature is kept, enabling the temperature in the vacuum nitriding furnace to reach 1450 ℃, keeping the temperature for 2 hours, closing the nitrogen after the temperature is kept, and then opening the furnace to obtain the composite vanadium-nitrogen alloy.

According to the technical scheme, vanadium pentoxide is used as a basic raw material, carbon powder is added, reduction reaction is carried out at a high temperature state to generate a vanadium-carbon material, then zinc powder, silicon iron powder and inorganic sodium silicate are prepared and pressed into a flat spheroid of 30-40 mm, and high-temperature nitridation treatment is carried out in a vacuum nitriding furnace to generate the product.

Therefore, the main raw materials of the composite vanadium-nitrogen alloy comprise vanadium and nitrogen additives for improving the mechanical property of steel, ferrosilicon powder and zinc element for improving the oxidation resistance and corrosion resistance of metal.

Moreover, the invention adopts the technical scheme, and also has the following beneficial effects:

(1) on the basis of a vanadium-nitrogen alloy product, the proportion of vanadium and nitrogen is optimized and adjusted, the configuration is balanced, the waste is reduced, a plurality of beneficial elements such as ferrosilicon and zinc are added, and the mechanical property of steel is improved.

(3) The addition of zinc can make the steel possess electrochemical oxidation resistance and corrosion resistance from outside to inside.

(4) The silicon element is increased, so that the oxygen can be removed and the addition amount of other silicon-containing alloy can be reduced.

In conclusion, the method can get rid of the high dependence on vanadium, and simultaneously add sufficient nitrogen and zinc to create environmental and economic benefits, and has electrochemical oxidation resistance and corrosion resistance, and improves the mechanical properties of steel.

The present invention will be further described with reference to the following examples.

Detailed Description

Example 1:

the composite vanadium-nitrogen alloy comprises the following components in percentage by weight: 30% of vanadium-carbon material, 40% of ferrosilicon powder, 10% of zinc powder, 17% of nitrogen and a binder.

The vanadium-carbon material is vanadium pentoxide and carbon powder which are smelted in an intermediate-frequency smelting furnace and subjected to reduction reaction to generate a vanadium simple substance and carbon powder.

The weight ratio of the vanadium pentoxide to the carbon powder is 4:1.

When 100g of vanadium pentoxide is obtained, 25g of carbon powder is obtained.

The reduction reaction of vanadium pentoxide and carbon powder is as follows: 100gV₂O₅+25gC powder → V₇₁ C₂₅Said V is₇₁ C₂₅Namely the vanadium-carbon material.

The vanadium pentoxide accounts for 98 percent of the vanadium pentoxide.

The carbon powder is 90 percent of carbon powder.

The binder is inorganic sodium silicate.

The ferrosilicon powder is 75 ferrosilicon powder.

The invention also provides a preparation method of the composite vanadium-nitrogen alloy, which specifically comprises the steps of preparing the vanadium-carbon material and preparing the composite vanadium-nitrogen alloy.

The vanadium-carbon material preparation step comprises the following steps:

s1, firstly, selecting 98% vanadium pentoxide, 90% carbon powder and inorganic sodium silicate, wherein the ratio of vanadium pentoxide to carbon powder is 4:1, the content of the inorganic sodium silicate is 1.5 percent of the total weight of the materials.

S2, filling vanadium pentoxide, carbon powder and inorganic sodium silicate into a mixer, stirring the materials for 2 hours by the mixer, and fully and uniformly mixing to obtain a mixture.

S3, pressing the mixed material by using a press, wherein the pressure of the press is 15KPa, and the size of the formed finished product is 30 mm of spherical body.

In step S3, the press is a hydraulic press.

S4, putting the reproduced product prepared in the step S2 into an intermediate frequency smelting furnace for smelting, and carrying out reduction reaction to generate vanadium-carbon materials.

In step S3, the specific reaction of the reduction reaction is: 4 parts of V₂O₅+1 part of C powder → V₇₁ C₂₅Said V is₇₁ C₂₅Namely the vanadium-carbon material.

The smelting temperature in the intermediate frequency smelting furnace is 1200 ℃, the temperature rise time is more than 30min, the material of the spheroid melts into liquid vanadium carbon material after the smelting temperature in the intermediate frequency smelting furnace reaches 1200 ℃, and at the moment, the liquid vanadium carbon material is discharged from the furnace.

S5, pouring the discharged liquid vanadium-carbon material into a cooling mold for normal-temperature cooling, wherein the normal-temperature cooling time is more than 8 hours, and obtaining a mold material after cooling, wherein the temperature of the mold material is normal temperature.

The size of the cooling mold in the step S4 is 2m in length, 1m in width, and 5cm in depth.

S6, grinding the die material prepared in the step S5 into powder through a grinding machine to obtain a powder vanadium carbon material, wherein the diameter of the powder vanadium carbon material is 0.1-1 mm.

The preparation method of the composite vanadium-nitrogen alloy comprises the following steps:

f1, loading the powdery vanadium-carbon material into a mixer, adding zinc powder, ferrosilicon powder and inorganic sodium silicate into the mixer, and mixing for 2 hours by the mixer to fully and uniformly mix the materials to obtain a mixture of the reproduced product.

The proportioning proportion of the powder vanadium-carbon material, zinc powder, ferrosilicon powder and inorganic sodium silicate is 30 percent of the vanadium-carbon material, 40 percent of the ferrosilicon powder, 10 percent of the zinc powder and 3 percent of the binder.

The diameter of the ferrosilicon powder and the zinc powder is 0.1-1 mm.

F2, pressing the mixture of the processed products by a press, wherein the pressure of the press is 15KPa, and the size of the formed finished product blank is a 30 mm spheroid.

F3, putting the finished product blank prepared in the step S6 into a vacuum nitriding furnace for vacuum nitriding treatment, and then cooling and crushing to prepare the composite vanadium-nitrogen alloy.

The method comprises the steps of firstly, loading a finished blank into a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to enable the pressure in the vacuum nitriding furnace to reach 0.020MPa, heating to enable the temperature in the vacuum nitriding furnace to reach 500 ℃, injecting industrial nitrogen (with the purity of more than 99.6%) into the vacuum nitriding furnace at the moment, enabling the flow of the nitrogen to be 200ml/min, continuously heating to raise the temperature, continuously introducing the nitrogen, stopping heating after the temperature in the vacuum nitriding furnace reaches 800 ℃, keeping the temperature for 2 hours, continuously heating to raise the temperature after the temperature is kept, enabling the temperature in the vacuum nitriding furnace to reach 1450 ℃, keeping the temperature for 2 hours, closing the nitrogen after the temperature is kept, and opening the furnace to obtain the composite vanadium-nitrogen alloy.

And cooling the composite vanadium-nitrogen alloy after discharging, and crushing the cooled composite vanadium-nitrogen alloy finished product into qualified particle size to obtain the finished product composite vanadium-nitrogen alloy.

The granularity of the crushed composite vanadium-nitrogen alloy is 10-50 mm.

In step F3, nitrogen was introduced in a total amount of 17% by weight based on the total weight of the material.

The physical and chemical indexes of the finished composite vanadium-nitrogen alloy prepared in the embodiment 1 are detected, and the detection structure is shown in the following table:

and the granularity of the composite vanadium-nitrogen alloy is 10-50mm through detection.

Therefore, the composite vanadium-nitrogen alloy has the following indexes: the granularity is 10-50mm, and the silicon element content is as follows: 23.02 percent, and the content of vanadium elements is as follows: 33.21 percent, and the content of zinc element is: 5.10 percent, and the content of nitrogen elements is as follows: 17.4866%, and the content of carbon element is: 1.98 percent, and the content of sulfur element is as follows: 0.033 percent, and the content of phosphorus elements: 0.021%.

Example 2:

the composite vanadium-nitrogen alloy comprises the following components in percentage by weight: 28% of vanadium-carbon material, 38% of ferrosilicon powder, 12% of zinc powder, 19% of nitrogen and a binder.

The vanadium-carbon material is a vanadium simple substance and carbon powder which are generated by smelting vanadium pentoxide and carbon powder in an intermediate-frequency smelting furnace and carrying out reduction reaction, wherein the weight ratio of the vanadium pentoxide to the carbon powder is 7: 3.

The vanadium pentoxide is vanadium pentoxide with the content of 98%, and the carbon powder is carbon powder with the content of 90%.

The binder is inorganic sodium silicate; the ferrosilicon powder is 75 ferrosilicon powder.

The invention also provides a preparation method of the composite vanadium-nitrogen alloy, which specifically comprises the steps of preparing the vanadium-carbon material and preparing the composite vanadium-nitrogen alloy.

The vanadium-carbon material preparation step comprises the following steps:

s1, firstly, selecting 98% vanadium pentoxide, 90% carbon powder and inorganic sodium silicate, wherein the ratio of vanadium pentoxide to carbon powder is 7: 4, the content of the inorganic sodium silicate is 2.0 percent of the total weight of the materials.

S2, filling vanadium pentoxide, carbon powder and inorganic sodium silicate into a mixer, stirring the materials for 3 hours by the mixer, and fully and uniformly mixing to obtain a mixture.

S3, pressing the mixed material by using a press, wherein the pressure of the press is 16KPa, and the size of the formed finished product is 35 mm of a spherical body.

In step S3, the press is a hydraulic press.

S4, putting the reproduced product prepared in the step S2 into an intermediate frequency smelting furnace for smelting, and carrying out reduction reaction to generate vanadium-carbon materials.

In step S3, the specific reaction of the reduction reaction is: 7 parts of V₂O₅+3 parts of C powder → V₇₁ C₂₅Said V is₇₁ C₂₅Namely the vanadium-carbon material.

And when the smelting temperature in the intermediate frequency smelting furnace reaches 1250 ℃, the temperature rise time is more than 30min, the material of the spheroid melts into liquid vanadium carbon material when the smelting temperature in the intermediate frequency smelting furnace reaches 1250 ℃, and the liquid vanadium carbon material is discharged.

And S5, discharging the vanadium-carbon material obtained in the step S4, pouring the discharged vanadium-carbon material into a cooling mold, and cooling at normal temperature for more than 9 hours to obtain a mold material after cooling, wherein the temperature of the mold material is normal temperature.

The size of the cooling mold in the step S5 is 2m in length, 1m in width, and 5cm in depth.

S6, grinding the die material prepared in the step S5 into powder through a grinding machine to obtain a powder vanadium carbon material, wherein the diameter of the powder vanadium carbon material is 0.1-1 mm.

The preparation method of the composite vanadium-nitrogen alloy comprises the following steps:

f1, loading the powdery vanadium-carbon material into a mixer, adding zinc powder, ferrosilicon powder and inorganic sodium silicate into the mixer, and mixing for 3 hours by the mixer to fully and uniformly mix the materials to obtain a mixture of the reproduced product.

The proportioning proportion of the powdery vanadium-carbon material, zinc powder, ferrosilicon powder and inorganic sodium silicate is 32 percent of the vanadium-carbon material, 38 percent of the ferrosilicon powder, 12 percent of the zinc powder and 4 percent of the binder; the diameter of the ferrosilicon powder and the zinc powder is 0.1-1 mm.

F2, pressing the mixture of the processed products by a press, wherein the pressure of the press is 16KPa, and the size of the finished product blank after forming is 35 mm of a spheroid.

F3, putting the finished product blank prepared in the step S6 into a vacuum nitriding furnace for vacuum nitriding treatment, and then cooling and crushing to prepare the composite vanadium-nitrogen alloy.

The method comprises the steps of firstly, loading a finished blank into a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to enable the pressure in the vacuum nitriding furnace to reach 0.025MPa, heating to enable the temperature in the vacuum nitriding furnace to reach 500 ℃, injecting industrial nitrogen (with the purity of more than 99.6%) into the vacuum nitriding furnace at the moment, enabling the flow rate of the nitrogen to be 250ml/min, continuously heating to raise the temperature, continuously introducing the nitrogen, stopping heating after the temperature in the vacuum nitriding furnace reaches 800 ℃, keeping the temperature for 2 hours, continuing heating to raise the temperature after the temperature is kept, enabling the temperature in the vacuum nitriding furnace to reach 1450 ℃, keeping the temperature for 2 hours, closing the nitrogen after the temperature is kept, and opening the furnace to obtain the composite vanadium-nitrogen alloy.

And cooling the composite vanadium-nitrogen alloy after discharging, and crushing the cooled composite vanadium-nitrogen alloy finished product into qualified particle size to obtain the finished product composite vanadium-nitrogen alloy.

The physical and chemical indexes of the finished composite vanadium-nitrogen alloy prepared in the embodiment 2 are detected, and the detection structure is shown in the following table:

and the granularity of the composite vanadium-nitrogen alloy is 10-50mm through detection.

Therefore, the composite vanadium-nitrogen alloy has the following indexes: the granularity is 10-50mm, and the silicon element content is as follows: 22.59 percent, and the content of vanadium elements is as follows: 33.02 percent, and the content of zinc element is as follows: 5.08 percent, and the content of nitrogen elements is as follows: 17.4755%, and the content of carbon element is: 1.96 percent, and the content of sulfur element is as follows: 0.031%, the phosphorus element content is: 0.022 percent.

Example 3:

the composite vanadium-nitrogen alloy comprises the following components in percentage by weight: 32% of vanadium-carbon material, 42% of ferrosilicon powder, 8% of zinc powder, 16% of nitrogen and a binder.

The vanadium-carbon material is a vanadium simple substance and carbon powder which are generated by smelting vanadium pentoxide and carbon powder in an intermediate-frequency smelting furnace and carrying out reduction reaction, wherein the weight ratio of the vanadium pentoxide to the carbon powder is 5: 2.

The vanadium pentoxide accounts for 98 percent of vanadium pentoxide; the carbon powder is 90 percent of carbon powder.

The binder is inorganic sodium silicate; the ferrosilicon powder is 75 ferrosilicon powder.

The invention also provides a preparation method of the composite vanadium-nitrogen alloy, which specifically comprises the steps of preparing the vanadium-carbon material and preparing the composite vanadium-nitrogen alloy.

The vanadium-carbon material preparation step comprises the following steps:

s1, firstly, selecting 98% vanadium pentoxide, 90% carbon powder and inorganic sodium silicate, wherein the ratio of vanadium pentoxide to carbon powder is 5:2, the content of the inorganic sodium silicate is 1 percent of the total weight of the materials.

S2, filling vanadium pentoxide, carbon powder and inorganic sodium silicate into a mixer, stirring the materials for 2 hours by the mixer, and fully and uniformly mixing to obtain a mixture.

S3, pressing the mixed material by using a press, wherein the pressure of the press is 17KPa, and the size of the formed finished product is 40 mm of spherical body.

In step S3, the press is a hydraulic press.

S4, putting the reproduced product prepared in the step S2 into an intermediate frequency smelting furnace for smelting, and carrying out reduction reaction to generate vanadium-carbon materials.

In step S3, the specific reaction of the reduction reaction is: 4 parts of V₂O₅+1 part of C powder → V₇₁ C₂₅Said V is₇₁ C₂₅Namely the vanadium-carbon material.

The smelting temperature in the intermediate frequency smelting furnace is 1300 ℃, the temperature rise time is more than 40min, the material of the spheroid melts into liquid vanadium carbon material after the smelting temperature in the intermediate frequency smelting furnace reaches 1300 ℃, and at the moment, the liquid vanadium carbon material is discharged from the furnace.

S5, pouring the liquid vanadium-carbon material discharged out of the furnace into a cooling mould for normal-temperature cooling, wherein the size of the cooling mould is 2m in length, 1m in width and 5cm in depth, the normal-temperature cooling time is more than 8 hours, the mould material is obtained after cooling is completed, and the temperature of the mould material is normal temperature.

S6, grinding the die material prepared in the step S5 into powder through a grinding machine to obtain a powder vanadium carbon material, wherein the diameter of the powder vanadium carbon material is 0.1-1 mm.

The preparation method of the composite vanadium-nitrogen alloy comprises the following steps:

f1, loading the powdery vanadium-carbon material into a mixer, adding zinc powder, ferrosilicon powder and inorganic sodium silicate into the mixer, and mixing for 2 hours by the mixer to fully and uniformly mix the materials to obtain a mixture of the reproduced product.

The proportioning proportion of the vanadium-carbon powder, the zinc powder, the ferrosilicon powder and the inorganic sodium silicate is 32 percent of the vanadium-carbon material, 42 percent of the ferrosilicon powder, 8 percent of the zinc powder and 2 percent of the binder.

The diameter of the ferrosilicon powder and the zinc powder is 0.1-1 mm.

F2, pressing the mixture of the processed products by a press, wherein the pressure of the press is 17KPa, and the size of the formed finished product blank is a 30 mm spheroid.

F3, loading the finished blank prepared in the step S6 into a vacuum nitriding furnace, vacuumizing the vacuum nitriding furnace to enable the pressure in the vacuum nitriding furnace to reach 0.030MPa, heating to enable the temperature in the vacuum nitriding furnace to reach 500 ℃, injecting industrial nitrogen (with the purity of more than 99.6%) into the vacuum nitriding furnace at the moment, enabling the flow of the nitrogen to be 300ml/min, continuously heating to raise the temperature, continuously introducing the nitrogen, stopping heating after the temperature in the vacuum nitriding furnace reaches 800 ℃, keeping the temperature for 2 hours, continuing heating to raise the temperature after the heat preservation is finished, enabling the temperature in the vacuum nitriding furnace to reach 1450 ℃, keeping the temperature for 2 hours, closing the nitrogen after the heat preservation is finished, opening the furnace at the moment, cooling and crushing to prepare the composite vanadium-nitrogen alloy.

The physical and chemical indexes of the finished composite vanadium-nitrogen alloy prepared in the embodiment 3 are detected, and the detection structure is shown in the following table:

and the granularity of the composite vanadium-nitrogen alloy is 10-50mm through detection.

Therefore, the composite vanadium-nitrogen alloy has the following indexes: the granularity is 10-50mm, and the silicon element content is as follows: 23.00 percent, the content of vanadium element is: 33.20 percent, and the content of zinc element is: 5.09%, and the content of nitrogen elements is as follows: 17.4856%, and the content of carbon element is: 2.01 percent, and the content of sulfur element is as follows: 0.028 percent, and the content of phosphorus element is as follows: 0.019 percent.

Trial summary and analysis of the composite vanadium-nitrogen alloy:

a steel mill smelts HRB400 of a steel seed in 7 days to 17 days in 11 months, phi 12 to 25 in a specification bar line, 1.3 tons of the composite vanadium-nitrogen alloy are tried, and the specific test conditions are as follows.

Firstly, components and performance conditions:

1. the first test uses the composite vanadium-nitrogen alloy of the invention to replace 50% of the traditional vanadium-nitrogen alloy, test 3 furnace, the components and performance are shown in the following table.

Table 1-HRB400 bar line 25 specifications:

table 2-HRB400 bar line 14 gauge:

it can be seen from the component properties that the composite vanadium-nitrogen alloy is tried to replace 50 percent of vanadium-nitrogen alloy, and the components of molten steel and the properties of steel meet the requirements.

2. In the second test, the composite vanadium-nitrogen alloy of the invention is used to completely replace the traditional vanadium-nitrogen alloy, and in the test 2, the specific components and properties are as follows.

Table 3-HRB400 bar line 14 gauge:

table 4-HRB400 bar line 25 gauge:

specification of	Furnace number	C/%	Si/%	Mn/%	V/%	Yield strength Mpa	Tensile strength Mpa
								25 gauge of wire rod	277163	0.28	0.51	1.41	0.030	476	642

3. In the third test, the composite vanadium-nitrogen alloy of the invention is used to completely replace the traditional vanadium-nitrogen alloy, the control standard of the vanadium content is reduced by 0.002%, and the specific component performance of the test 3 furnace is as follows.

Table 5-HRB400 bar line 22 gauge:

table 6-HRB400 bar line 14 gauge:

4. in the fourth test, the composite vanadium-nitrogen alloy is used for completely replacing the vanadium-nitrogen alloy, the control standard of the vanadium content is continuously reduced by 0.002%, and the specific component performance of the test 2 furnace is as follows.

Table 7-HRB400 bar line 14 gauge:

specification of	Furnace number	C/%	Si/%	Mn/%	V/%	Yield strength Mpa	Tensile strength Mpa
								14 gauge of wire	184768	0.22	0.50	1.34	0.020	446	638

Table 8-HRB400 bar line 20 gauge:

specification of	Furnace number	C/%	Si/%	Mn/%	V/%	Yield strength Mpa	Tensile strength Mpa
								Rod wire 20 specification	277439	0.22	0.50	1.32	0.020	448	626

Table 9-HRB400 bar line 25 gauge:

secondly, alloy unit consumption and cost comparison:

the first test:

and (3) second test:

for the third test:

fourth trial (small batch rolling):

fourth trial (small batch rolling):

thirdly, conclusion:

1. the adding amount of the composite vanadium-nitrogen alloy is tried to be 0.76 kg/ton steel, the vanadium content of the rod line HRB400 phi 14, phi 20 and phi 22 specifications is reduced by 0.008 percent compared with the original process, the steel performance meets the requirement, and the alloy cost is reduced by 1.90 yuan/ton steel compared with the original process.

2. The trial composite vanadium-nitrogen alloy addition is 0.76kg per ton of steel, the HRB400 phi 25 specification vanadium content is reduced by 0.010 percent compared with the original process, the steel performance meets the requirement, and the alloy cost is reduced by 5.07 yuan per ton of steel compared with the original process.

Therefore, by adopting the technical scheme, the mechanical property of the steel material can be improved, the steel material can meet the requirements, the high dependence on vanadium can be eliminated, sufficient nitrogen and zinc elements can be added, the reaction can be sufficiently participated, the production cost of the steel material can be reduced, the economic benefit of enterprises can be improved, and the use effect can be greatly improved.

It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.