A kind of high-nitrogen and low-oxygen silicon-vanadium-iron nitride alloy and preparation method thereof

Abstract

The invention discloses a high-nitrogen low-oxygen silicon nitride vanadium iron alloy and a preparation method thereof, and belong to the technical field of iron alloys. The high-nitrogen low-oxygensilicon nitride vanadium iron alloy is prepared from the compositions in percentage by weight: 30%-34% of vanadium, 10%-15% of silicon, 14%-16% of nitrogen, less than or equal to 0.8% of oxygen, lessthan or equal to 0.3% of C, less than or equal to 0.03% of sulfur, less than or equal to 0.05% of phosphorus and the balance of Fe. According to the preparation method of the high-nitrogen low-oxygensilicon nitride vanadium iron alloy, production is carried out at a micro-positive pressure of 0.18-0.2MPa, vanadium and silicon are separately nitrided at different temperatures in two steps, the nitriding effect of vanadium and silicon is fully guaranteed, and the nitrogen content in the alloy is improved; meanwhile, a raw material of the preparation method is purchased Ferrosilicon vanadium, the cost is low, the content of each component in a raw material product can be controlled, and the process route is simple; and meanwhile, a high vacuum sintering furnace is used for nitriding reaction, mass production can be carried out, and the preparation method can be applied on a large scale in the industry.

Description

technical field

[0001] The invention relates to the technical field of ferroalloys, in particular to a high-nitrogen and low-oxygen silicon-vanadium ferro-nitride alloy and a preparation method thereof. Background technique

[0002] In recent years, the most important technical progress of steel bars and rebars for construction is the use of microalloying technology to produce high-strength steel during the smelting process. The commonly used microalloying elements are niobium, vanadium and so on. They are usually added in the form of vanadium-iron alloy or niobium-iron alloy, and also in the form of vanadium-nitrogen alloy. However, the price of ferroniobium is expensive and the cost of microalloying is high. The microalloying effect of vanadium-iron alloy is not as good as that of vanadium-nitrogen alloy. When using vanadium-nitrogen alloy microalloying, the recovery rate of vanadium is low because part of the vanadium exists in the form of vanadium oxide and enters the s...

Examples

preparation example Construction

[0031] The present invention also provides a method for preparing a high-nitrogen and low-oxygen silicon-vanadium-iron alloy, comprising the following steps:

[0032] Step 1: Grinding ferrosilicon vanadium into 100-400 mesh fine powder, in step 1, the amount of the binder added is 7-8% of the mixture quality, (the binder is industrial starch and water according to the weight The ratio of 1:4 is mixed and configured), stirred and mixed, and the mixture is pressed into a block with a press; wherein, the composition of the ferrosilicon vanadium is composed by weight percentage: vanadium 35%-40%, silicon 12% -18%, carbon≤0.5%, sulfur≤0.05%, phosphorus≤0.05%, and the balance is Fe.

[0033] Step 2: Put the pressed massive ferrosilicon vanadium into the electric drying kiln, and dry it under the condition of 300-400 ℃;

[0034] Step 3: Put the dried bulk ferrosilicon vanadium into the high vacuum sintering furnace, and then send electricity to raise the temperature under the condit...

Embodiment 1

[0040] A preparation method of high-nitrogen and low-oxygen silicon-vanadium-iron alloy, comprising the following steps:

[0041] Step 1: Grind ferrosilicon vanadium into 100 mesh fine powder, then add binding agent, the amount that described binding agent adds is 7% of mixture quality, (binding agent is industrial starch and water according to weight ratio 1: 4 ratio mixed configuration). Stir and mix evenly, and press the mixture into blocks with a press; wherein, the composition of the ferrosilicon vanadium is composed of 35% vanadium, 12% silicon, 0.5% carbon, 0.05% sulfur, 0.05% phosphorus, and the remaining The amount is Fe.

[0042] Step 2: Put the pressed massive ferrosilicon vanadium into the electric drying kiln, and dry it at 300°C;

[0043] Step 3: Put the dried bulk ferrosilicon vanadium into the high vacuum sintering furnace, and then send electricity to raise the temperature under the condition of vacuum degree of 0.01Pa. Nitriding of vanadium is carried out ...

Embodiment 2

[0046] A preparation method of high-nitrogen and low-oxygen silicon-vanadium-iron alloy, comprising the following steps:

[0047] Step 1: Grind ferrosilicon vanadium into 200 mesh fine powder with Raymond mill, then add binder, the amount of said binder added is 7.5% of the mass of the mixture, (the binder is industrial starch and water according to It is mixed and configured at a weight ratio of 1:4). Stir and mix evenly, and press the mixture into blocks with a press; wherein, the composition of the ferrosilicon vanadium is composed of 38% vanadium, 16% silicon, 0.3% carbon, 0.03% sulfur, 0.04% phosphorus, and the remaining The amount is Fe.

[0048] Step 2: Put the pressed massive ferrosilicon vanadium into the electric drying kiln, and dry it at 380°C;

[0049] Step 3: Put the dried bulk ferrosilicon vanadium into the high vacuum sintering furnace, and then send electricity to raise the temperature under the condition of vacuum degree of 0.8Pa. Nitriding of vanadium is ...

technical field

[0001] The invention relates to the technical field of ferroalloys, in particular to a high-nitrogen and low-oxygen silicon-vanadium ferro-nitride alloy and a preparation method thereof. Background technique

[0002] In recent years, the most important technical progress of steel bars and rebars for construction is the use of microalloying technology to produce high-strength steel during the smelting process. The commonly used microalloying elements are niobium, vanadium and so on. They are usually added in the form of vanadium-iron alloy or niobium-iron alloy, and also in the form of vanadium-nitrogen alloy. However, the price of ferroniobium is expensive and the cost of microalloying is high. The microalloying effect of vanadium-iron alloy is not as good as that of vanadium-nitrogen alloy. When using vanadium-nitrogen alloy microalloying, the recovery rate of vanadium is low because part of the vanadium exists in the form of vanadium oxide and enters the s...

Examples

preparation example Construction

[0031] The present invention also provides a method for preparing a high-nitrogen and low-oxygen silicon-vanadium-iron alloy, comprising the following steps:

[0032] Step 1: Grinding ferrosilicon vanadium into 100-400 mesh fine powder, in step 1, the amount of the binder added is 7-8% of the mixture quality, (the binder is industrial starch and water according to the weight The ratio of 1:4 is mixed and configured), stirred and mixed, and the mixture is pressed into a block with a press; wherein, the composition of the ferrosilicon vanadium is composed by weight percentage: vanadium 35%-40%, silicon 12% -18%, carbon≤0.5%, sulfur≤0.05%, phosphorus≤0.05%, and the balance is Fe.

[0033] Step 2: Put the pressed massive ferrosilicon vanadium into the electric drying kiln, and dry it under the condition of 300-400 ℃;

[0034] Step 3: Put the dried bulk ferrosilicon vanadium into the high vacuum sintering furnace, and then send electricity to raise the temperature under the condit...

Embodiment 1

[0040] A preparation method of high-nitrogen and low-oxygen silicon-vanadium-iron alloy, comprising the following steps:

[0041] Step 1: Grind ferrosilicon vanadium into 100 mesh fine powder, then add binding agent, the amount that described binding agent adds is 7% of mixture quality, (binding agent is industrial starch and water according to weight ratio 1: 4 ratio mixed configuration). Stir and mix evenly, and press the mixture into blocks with a press; wherein, the composition of the ferrosilicon vanadium is composed of 35% vanadium, 12% silicon, 0.5% carbon, 0.05% sulfur, 0.05% phosphorus, and the remaining The amount is Fe.

[0042] Step 2: Put the pressed massive ferrosilicon vanadium into the electric drying kiln, and dry it at 300°C;

[0043] Step 3: Put the dried bulk ferrosilicon vanadium into the high vacuum sintering furnace, and then send electricity to raise the temperature under the condition of vacuum degree of 0.01Pa. Nitriding of vanadium is carried out ...

Embodiment 2

[0046] A preparation method of high-nitrogen and low-oxygen silicon-vanadium-iron alloy, comprising the following steps:

[0047] Step 1: Grind ferrosilicon vanadium into 200 mesh fine powder with Raymond mill, then add binder, the amount of said binder added is 7.5% of the mass of the mixture, (the binder is industrial starch and water according to It is mixed and configured at a weight ratio of 1:4). Stir and mix evenly, and press the mixture into blocks with a press; wherein, the composition of the ferrosilicon vanadium is composed of 38% vanadium, 16% silicon, 0.3% carbon, 0.03% sulfur, 0.04% phosphorus, and the remaining The amount is Fe.

[0048] Step 2: Put the pressed massive ferrosilicon vanadium into the electric drying kiln, and dry it at 380°C;

[0049] Step 3: Put the dried bulk ferrosilicon vanadium into the high vacuum sintering furnace, and then send electricity to raise the temperature under the condition of vacuum degree of 0.8Pa. Nitriding of vanadium is ...