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Steel additive agent vanadium nitride alloy powder core-spun wire

A technology of vanadium nitride alloy and iron and steel additive, which is applied in the field of vanadium nitride alloy additive products, can solve the problems of large powder loss, reduced VN content of materials, and has not been used, and achieves the improvement of recovery rate and the improvement of recovery rate. Effect

Inactive Publication Date: 2011-09-14
蔡惜辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this scheme also has following shortcoming: 1, because vanadium nitride alloy is a kind of hardness very big, the material with stronger intensity, this method will break block VN alloy into powder with mechanical crushing, easily cause The material is heated and oxidized, reducing the VN content of the material, and there are also problems such as large energy consumption and large powder loss; 2. There is inevitably residual air in the cored wire, and the cored wire is in the high temperature of molten steel. , these residual air will oxidize the material, further reducing the VN content of the material
This scheme claims that the vanadium recovery rate can be increased by about 5%, and the nitrogen recovery rate can be increased by about 10-20%, which is actually difficult to achieve, so this scheme has not been applied in actual steelmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The two powders with the composition of 94% vanadium nitride alloy powder (mass percentage) and metal aluminum powder 6% (mass percentage) are uniformly mixed with a mixer, and the particle size of the two powders is not greater than 5 mm. A low-carbon steel cold-rolled steel strip with a thickness of 0.35 mm is used as the outer layer, and the above-mentioned mixed powder is used as the core layer on a core-spun machine to wrap a core-spun wire with an outer diameter of 13 mm. The finished cored wire weighs 330g per meter, of which the weight of the steel skin is 145g and the weight of the core powder is 185g.

[0026] The vanadium nitride alloy powder is directly prepared by the following process:

[0027] Weigh equivalent to V 2 O 5 Amount of 12% activated carbon, with V 2 O 5 Mix well. Lay a thin layer of the mixed material on the material pan of a material car with a multi-layer material pan structure, and the material car is pushed into the pre-reduction section by an...

Embodiment 2

[0030] Mix the three powders with the composition of 84% vanadium nitride alloy powder (mass percentage), metal aluminum powder 9% (mass percentage) and carbonaceous powder 7% with a mixer. The particle size of the three powders No more than 3mm. A low-carbon steel cold-rolled steel strip with a thickness of 0.40mm is used as the outer layer, and the above-mentioned powder is used as the core layer on the core-spun machine to wrap the cored wire with an outer diameter of 16mm. The finished cored wire weighs 450g per meter, of which the weight of the steel skin is 160g and the weight of the core powder is 290g.

[0031] The vanadium nitride alloy powder is directly prepared by the following process:

[0032] Weigh equivalent to NH 4 VO 3 The amount of 6.5% charcoal powder, with NH 4 VO 3 After being thoroughly mixed and evenly spread, it is placed on the material pan of the material car, and the material car enters the pre-reduction section of the preparation furnace. Access to NH...

Embodiment 3

[0035] Mix the three powders with the composition of 75% vanadium nitride alloy powder (mass percentage), metal aluminum powder 17% (mass percentage) and carbon powder 8% with a mixer. The particle size of the three powders No more than 4mm. A low-carbon steel cold-rolled steel strip with a thickness of 0.40mm is used as the outer layer, and the above-mentioned powder is used as the core layer on the core-spun machine to wrap the cored wire with an outer diameter of 16mm. The finished cored wire weighs 460g per meter, of which the weight of the steel skin is 160g and the weight of the core powder is 300g.

[0036] The vanadium nitride alloy powder is directly prepared by the following process:

[0037] Weigh the graphite powder equivalent to 8.5% by weight of ammonium polyvanadate, mix it evenly with ammonium polyvanadate and spread it on the material pan of the material truck, which is pushed into the pre-reduction section of the preparation furnace. Access to NH 3 Control the f...

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Abstract

The invention discloses a steel additive agent vanadium nitride alloy powder core-spun wire and relates to a vanadium nitride alloy additive agent product used for increasing vanadium and nitrogen of molten steel in a steel smelting process. The core-spun wire comprises a core layer and an outer steel layer, wherein the core layer is made into a wire shape through the outer layer by using a core-spun machine. The core layer contains 75-97 percent of vanadium nitride alloy powder, 3-20 percent of metallic aluminum powder and 0-10 percent of carbon powder, wherein the vanadium nitride alloy powder is a mixed powder raw material obtained by compounding with vanadium compound powder and carbon powder, and at an appropriate temperature, the mixed powder raw material is reduced and nitrided by ammonia or ammonia-nitrogen mixed gas to directly obtain the vanadium nitride alloy powder. During smelting, the core-spun wire is directly and deeply inserted into the molten steel by utilizing equipment such as a wire feeder, and the like, which can ensure that vanadium nitride alloy can be better dissolved into the molten steel so as to improve the recovery rates of the vanadium and the nitrogen during smelting steel. Meanwhile, the contents of the vanadium and the nitrogen in the molten steel can be stably controlled so as to improve the stability of steel in large-scale industrial production.

Description

Technical field [0001] The invention relates to a vanadium nitride alloy additive product used for adding vanadium and nitrogen to molten steel in a steelmaking process. Background technique [0002] In the steelmaking process of microalloyed steel, vanadium nitride (VN) alloy can be added to the steel to increase vanadium and nitrogen in the microalloyed steel, thereby improving the performance of the steel. In the existing process, the bulk VN alloy is generally added directly to the ladle before and after tapping. Due to the massive vanadium nitride (VN) alloy, the density is ≥3.0g / cm 3 , Much smaller than molten steel, close to the liquid phase of steel slag, and VN is unstable in the air at high temperatures. During steelmaking, a massive VN alloy is added to the ladle. When the alloy block approaches, enters the slag layer and stays in the steel When the surface of the liquid enters the molten steel, it has to withstand a relatively high temperature for a period of time, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
Inventor 吴建锋蔡惜辉郑臣谋
Owner 蔡惜辉