Product and method for direct vanadium alloying of molten steel

A vanadium alloying and direct technology, applied in the field of metallurgy, can solve the problems of difficulty in guaranteeing the degree of microalloying, long alloying process time, complex and cumbersome process operation, etc., to improve material utilization, shorten alloying process time, reduce Effects of Environmental Pollution

Active Publication Date: 2021-08-24
MAANSHAN XINGDA METALLURGICAL NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0022] In view of the complex and cumbersome process operation in the method of using vanadium compounds to directly carry out vanadium microalloying on molten steel in the prior art, the alloying process takes a long time, the degree of microalloying is difficult to guarantee, the yield rate is low and the yield rate fluctuates widely. The present invention provides a product and method for directly alloying molten steel with vanadium or vanadium-nitrogen by using a preliminary enriched vanadate compound. Using the product of the present invention can complete the vanadium addition to molten steel and the synchronous addition of vanadium. When nitrogen is added, the nitrogen-enhancing agent can increase the nitrogen of molten steel, replace the finished vanadium-iron alloy or vanadium-nitrogen alloy, and realize the direct vanadium or vanadium-nitrogen alloying of molten steel by vanadate and other compounds

Method used

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Embodiment 1

[0059] A method of directly alloying molten steel with vanadium in this embodiment. Ammonium metavanadate with a purity of 98% and anthracite coal powder (particle size less than 300 μm) with a fixed carbon of 88% are used as the reaction materials, and the moles of fixed carbon elements in the coal powder are combined with the total oxygen moles of vanadium in the vanadate and in the vanadium compound. The ratio of moles of vanadium to sum is 0.85, mixed with anthracite coal powder, ammonium vanadate and coal powder are mixed together and then pressurized and packaged into a miniature single airtight container with an external dimension of approximately 60*20*50mm and a shell wall thickness of 0.15mm. Inside, the total amount of alloying material is 0.83kg, which is added to a casting ladle with a capacity of 1 ton and a lower surface temperature of 1250°C. After waiting for 5 minutes, the steel is tapped. The surface temperature of the middle and lower lining of the ladle bef...

Embodiment 2

[0061] In this embodiment, the direct alloying method of vanadium and nitrogen is carried out simultaneously. Ammonium metavanadate with a purity of 98%, anthracite coal powder with a fixed carbon of 88%, and ferrosilicon nitride with a silicon nitride purity of 79% are used as reaction materials, and the ratio is 1:0.46:0.40 (at this time, in the pulverized coal The ratio of the moles of fixed carbon elements to the total moles of oxygen combined with vanadium in the vanadate radical and the sum of the moles of vanadium in the vanadium compound is 1.0, and the weight ratio of nitrogen and vanadium in the product material is 0.61). The particle size of all materials is less than 400μm. After mixing, they are pressurized and packaged together into a miniature single airtight container with an approximate size of 60*40*50mm and a wall thickness of 0.50mm. The total amount of alloyed materials is 51kg, together with The gross weight of the shell of the closed reactor is about 72k...

Embodiment 3

[0063] In this embodiment, the direct alloying method of vanadium and nitrogen is carried out simultaneously. Ammonium metavanadate with a purity of 98%, anthracite coal powder with a fixed carbon of 88%, and ferrosilicon nitride with a silicon nitride purity of 79% are used as the reaction materials, and the ratio is 1:0.42:0.40 (at this time, in the pulverized coal The ratio of the moles of fixed carbon elements to the total oxygen moles combined with vanadium in the vanadate radical and the moles of vanadium in the vanadium compound is 0.92, and the weight ratio of nitrogen and vanadium in the product material is 0.61). The particle size of all materials is less than 400μm. After mixing, they are pressurized and packaged into a miniature single airtight container with an approximate size of 60*40*50mm and a wall thickness of 0.50mm. The total amount of alloyed materials is 48kg, together with The gross weight of the shell of the closed reactor is about 69kg, and it is put i...

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Abstract

The invention discloses a product and method for direct vanadium alloying of molten steel, and belongs to the technical field of metallurgy. By means of the product and the method, a vanadate vanadium compound, a reduction and carbonization agent and a nitrogen increasing agent during synchronous vanadium-nitrogen alloying are crushed and mixed uniformly, the mixture is packaged into a closed reactor serving as a carbon steel shell to be prepared into a sealed monomer product, the sealed monomer product is added into a transfer hot steel ladle or baking hot steel ladle waiting for tapping before and after steel ladle hot repair, steel ladle heat storage is directly used for carbothermal pre-reduction and carbonization of vanadium in the vanadate compound, reduction of vanadium and subsequent molten steel vanadium or vanadium-nitrogen alloying are further completed in the subsequent tapping process so as to replace a finished ferrovanadium alloy or vanadium-nitrogen alloy, vanadium increase of the vanadium compound on the molten steel or synchronous vanadium increase and nitrogen increase of the molten steel are completed, and therefore direct vanadium or vanadium-nitrogen alloying is carried out on the molten steel through carbothermal reduction by adopting a two-step method of vanadate and other compounds.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a product and method for direct vanadium alloying of molten steel. Background technique [0002] In the field of metallurgy, vanadium microalloying of steel is one of the main microalloying methods to improve the comprehensive performance of steel. Vanadium microalloying is mainly the formation of VN, V(C,N) and VC between vanadium and N and C in steel, and the vanadium nitride, vanadium carbonitride and vanadium carbide formed in steel mainly play the role of grain refinement and The role of precipitation strengthening, thereby greatly improving the performance of steel. Vanadium microalloying of steel is widely used in the production of steel for various purposes, and the specific way of realization is to carry out vanadium alloying on molten steel. [0003] It is a metallurgical and chemical process with high energy consumption, high pollution and low effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/00C22C38/12
CPCC22C33/04C21C7/0025C21C7/00C22C38/12
Inventor 乌力平李国安
Owner MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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