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Rapid desulfurizing method for smelting ultrapure steel with vacuum induction furnace

A vacuum induction furnace, pure steel technology, applied in furnaces, electric furnaces, furnace types, etc., can solve the problems of high slag removal intensity, affecting purity, environmental pollution, etc., achieving strong controllability, low cost, and easy operation. row effect

Inactive Publication Date: 2012-10-03
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional desulfurization method is to use CaO, CaF 2 As a desulfurizer, its disadvantage is that a large amount of steel slag is produced, and the slag removal is strong and difficult to remove during production, and the processing of a large amount of steel slag is easy to cause environmental pollution
Moreover, for vacuum induction furnace smelting, if the above scheme is used to add conventional desulfurizers to make slag in the vacuum induction furnace, the slag will float up, which will be difficult to remove and affect the purity. Ultra-pure steel with an oxygen content below 25ppm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] For smelting a certain steel, the weight percentage of each component is required to be C≤150ppm, Si≤0.03%, Mn: 0.6-1.0%, P≤0.01%, S≤15ppm.

[0024] 1) According to the requirements of steel composition, it is calculated that 47kg of clean industrial pure iron, 5g of carbon particles, 5g of supplementary deoxidizer Al shot (purity ≥ 99%), 400g of metal Mn, and 15g of rare earth wire are required for pre-deoxidizer and alloy at 250°C Bake at high temperature for 4h;

[0025] 2) Put industrial pure iron and 1g of carbon particles into the crucible of the vacuum induction furnace, put the remaining 4g of carbon particles in the alloying chute, put the metal manganese and rare earth wires into the material bin, and then pump the vacuum chamber Vacuum for 3 minutes, so that the vacuum degree of the vacuum chamber reaches 0.05-0.1Pa;

[0026] 3) Send electrochemical steel to the vacuum induction furnace, and add 4g of carbon particles in the chute evenly in batches after the...

Embodiment 2

[0035] For smelting a certain steel, the weight percentage of each component is required to be C≤150ppm, Si≤0.03%, Mn: 0.6-1.0%, P≤0.01%, S≤15ppm.

[0036] 1) According to the calculation of steel composition requirements, it is calculated that 47kg of clean industrial pure iron, 8g of deoxidizer carbon particles, 400g of metal Mn, and 20g of rare earth wire are required. Baking the pre-deoxidizer and alloy at 250°C for 4h;

[0037] 2) Put industrial pure iron and 1.5g of carbon particles into the crucible of the vacuum induction furnace, put the remaining 6.5g of carbon particles in the alloying chute, put the metal manganese and rare earth wire into the silo, and then put the vacuum chamber Carry out vacuuming for 8 minutes, so that the vacuum degree in the vacuum chamber reaches 0.08-0.1Pa;

[0038] 3) Send electrochemical steel to the vacuum induction furnace, and add 6.5g of carbon particles in the chute evenly in batches after the molten steel appears in the chemical ste...

Embodiment 3

[0047] For smelting a certain steel, the weight percent content of each component is required to be C≤150ppm, Si≤0.03%, Mn: 0.6-1.0%, P≤0.01%, S≤15ppm.

[0048] 1) According to the calculation of steel composition requirements, it is calculated that 47kg of clean industrial pure iron, 10g of carbon particles, 8g of supplementary deoxidizer ferrosilicon pellets, 400g of metal Mn, and 25g of rare earth wire are required. Baking the pre-deoxidizer and alloy at 350°C 2h;

[0049] 2) Put industrial pure iron and 4g of carbon particles into the crucible of the vacuum induction furnace, put the remaining 6g of carbon particles in the alloying chute, put the metal manganese and rare earth wire into the material bin, and then pump the vacuum chamber Vacuum for 5 minutes to make the vacuum in the vacuum chamber reach 0.05-0.08Pa;

[0050] 3) Send electrochemical steel to the vacuum induction furnace, and add 6g of carbon particles in the chute evenly in batches after the molten steel a...

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Abstract

The invention discloses a rapid desulfurizing method for smelting ultrapure steel with a vacuum induction furnace, which comprises the following steps of: calculating the weights of a needed steel scrap raw material, various alloys, carbon granules used as an deoxidizing agent and rare earth wires used as a desulfurizing agent according to the component requirement of steel, and weighing the raw materials; then closing a vacuum chamber, and vacuumizing for 3-8 minutes until the vacuum degree of the vacuum chamber reaches 0.05-0.1 Pa; carrying out power transmission on the vacuum induction furnace for melting steel, and adding the carbon granules in a chute to molten steel by batches during the steel melting process; maintaining the vacuum degree of the vacuum chamber at 0.05-0.1 Pa after steel melting, and continuing vacuumizing for 15-20 minutes; stopping vacuumizing, and introducing argon gas to the vacuum chamber until the pressure in the vacuum chamber reaches 500-700 Pa; adding the various alloys to the molten steel for alloying treatment; adding the desulfurizing agent to the molten steel, stirring, oscillating and standing; and pouring to an ingot mold in a vacuum environment while retaining 2-10% of molten steel. Practice proves that the desulfurizing method provided by the invention employs a precipitation method to desulfurize without slag addition or slag generation, generated desulfurized products are removed through precipitation, rapid desulfurization can be realized, the operation is simple and feasible and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of vacuum induction furnace smelting, and specifically refers to a rapid desulfurization method for smelting ultra-pure steel in a vacuum induction furnace. Background technique [0002] The presence of sulfur in steel will reduce the mechanical properties of steel, increase anisotropy, reduce deep drawing performance, and thus increase the rate of hot cracking scrap. Therefore, desulfurization of ultra-pure steel is a difficult problem that must be solved. The traditional desulfurization method is to use CaO, CaF 2 As a desulfurizer, its disadvantage is that it produces a large amount of steel slag, which is strong and difficult to remove during production, and it is easy to cause environmental pollution when dealing with a large amount of steel slag. Moreover, for vacuum induction furnace smelting, if the above scheme is used to add conventional desulfurizers to make slag in the vacuum induction furnace,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
Inventor 陈子宏马国军吴莉汪波彭春
Owner 武钢集团有限公司
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