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Method for conducting vanadium alloying through vanadium slag in smelting process of vanadium-containing semisteel revolving furnace

A converter smelting and vanadium alloying technology is applied in the field of vanadium alloying using vanadium slag in vanadium-containing semi-steel converter smelting, which can solve the problems affecting the market competitiveness of products, the high production cost of high-strength steel, and the high price of ferroalloys. problem, to achieve the effect of low cost, lower production cost and stable yield

Inactive Publication Date: 2018-06-22
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the tapping process of the converter, vanadium-containing alloys are added into the ladle for microalloying. This method has the advantages of less dosage and stable absorption rate. However, due to the high price of ferroalloys, the production cost of high-strength steels remains high, which affects Product market competitiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The target steel grade of this example is HRB400, and the V content requirement of the finished product is 0.045-0.060%. 2 o 5 Vanadium slag with a content of 17% is alloyed; the specific operations are as follows:

[0034] A, the above-mentioned vanadium slag is broken into fragments of 5~15mm particle size, then put into the furnace feed bin of the converter for subsequent use;

[0035] B. Before tapping the converter, after the ladle is in place, start argon blowing at the bottom of the ladle for 50 seconds, and the intensity of argon blowing is controlled at 1.5L / Min·t steel. The amount of slag added is calculated by the formula. When using this grade of vanadium-containing slag to add 0.05% vanadium, the dosage is 5.78kg / ton of steel. Put the vanadium slag into the ladle and start tapping. Argon is blown throughout the tapping process, and the argon blowing time is 5in. Argon blowing intensity is controlled at 3L / Min·t steel;

[0036] C. According to the composi...

Embodiment 2

[0040] The target steel grade of this example is HRB400, and the V content requirement of the finished product is 0.030-0.060%. 2 o 5 Content is that the vanadium slag of 12% carries out alloying; Concrete operation is as follows:

[0041] A, above-mentioned vanadium slag is broken into the fragment of mm granularity, then the fragment is put into the feed bin of converter for subsequent use;

[0042] B. Before the converter is tapped and the ladle is in place, argon blowing at the bottom of the ladle is started for 60s, and the intensity of the argon blowing is controlled at 3L / Min·t steel. According to the composition analysis results at the end of the converter, the residual vanadium at the end of the converter molten steel is 0.005%, according to the vanadium slag per ton of steel According to the calculation of the amount of addition, the dosage when using this grade of vanadium slag to increase vanadium by 0.045% is 7.36kg / ton of steel. Put the vanadium slag into the la...

Embodiment 3

[0047] The target steel grade of this example is HRB400, and the V content requirement of the finished product is 0.030-0.060%. 2 o 5 Content is that the vanadium slag of 12% carries out alloying; Concrete operation is as follows:

[0048] A, the above-mentioned vanadium slag is broken into fragments of 10mm particle size, then the fragments are put into the feed bin of the converter furnace for subsequent use;

[0049] B. Alloying vanadium slag during converter tapping: after the ladle is in place, argon blowing at the bottom of the ladle is started for 60s, and the intensity of argon blowing is controlled at 1L / Min·t steel, and then tapping is started, and argon blowing is carried out throughout the tapping process, and the argon blowing time is 6min, the intensity of argon blowing is controlled at 3L / Min·t steel, according to the composition analysis results of the end point of the converter, the remaining vanadium at the end point of the converter molten steel is 0.005%, ...

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Abstract

The invention discloses a method for conducting vanadium alloying through vanadium slag in the smelting process of a vanadium-containing semisteel revolving furnace and belongs to the technical fieldof steelmaking. The method aims at achieving the technical effects that the steelmaking method for conducting vanadium alloying through the vanadium slag in the revolving furnace is provided, thus, avanadium-containing iron alloy is partly or wholly replaced with the vanadium slag low in price, and a low-cost high-strength steel is produced. The method comprises the following steps of crushing the vanadium slag into blocks; before steel tapping or in the steel tapping process of the revolving furnace and after a steel ladle is in place, adding the vanadium slag to the steel ladle according tothe revolving furnace final point element analysis result, and adding a deoxidizing agent and other alloy elements of the target steel in the steel tapping process; and when steel tapping is ended, controlling the slag thickness of the steel ladle, and adding lime and fluorite to the slag surface. According to the steel obtained through the method, the vanadium yield is stable; the technologicalprocess is short; cost is low; chemical constituents and performance indexes of the steel can completely meet relevant standard requirements; and a more economical route is provided for production ofthe vanadium-containing steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for vanadium-containing semi-steel converter smelting using vanadium slag for vanadium alloying. Background technique [0002] At present, in order to meet the requirements of high-strength steel, iron and steel enterprises usually adopt the production method of adding V, Ti, Nb and other elements to the steel for microalloying in the smelting process, which plays the role of precipitation strengthening and inhibiting grain growth. , thereby significantly improving the mechanical properties of steel. [0003] During the tapping process of the converter, vanadium-containing alloys are added into the ladle for microalloying. This method has the advantages of less dosage and stable absorption rate. However, due to the high price of ferroalloys, the production cost of high-strength steels remains high, which affects Product market competitiveness. Panzhihua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
CPCC21C5/28
Inventor 雷辉王二军李盛李利刚张林段方伦
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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