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Ferritic alloy for adjusting content of dissolved oxygen in molten steel, and preparation and usage method thereof

A technology of dissolved oxygen content and dissolved oxygen, which is applied in the field of smelting, can solve the problems of poor applicability, poor oxygen control accuracy, and low oxygen control accuracy, and achieve the effect of high utilization rate and stable and accurate oxygen control

Active Publication Date: 2013-10-02
江苏星爵实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large density difference between oxides and molten steel, oxides partially float during the addition process, and the oxygen control accuracy is not high; in addition, Mn-containing oxide additives may cause fluctuations in the mass fraction of Mn in molten steel
[0009] The above methods for adjusting the mass fraction of molten steel oxygen have problems such as poor oxygen control accuracy and poor applicability to varying degrees. Oxygen mass fraction method

Method used

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  • Ferritic alloy for adjusting content of dissolved oxygen in molten steel, and preparation and usage method thereof
  • Ferritic alloy for adjusting content of dissolved oxygen in molten steel, and preparation and usage method thereof
  • Ferritic alloy for adjusting content of dissolved oxygen in molten steel, and preparation and usage method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] An iron-oxygen alloy for adjusting the dissolved oxygen content of molten steel. The oxygen content is 0.01% by mass percentage, and exists in the form of supersaturated solid solution, bubbles and FeO, and the balance is Fe and unavoidable impurities.

[0037] Its scanning electron microscope picture is as figure 1 shown, from figure 1 It can be seen that FeO is dispersed in the ferrite alloy; its XRD pattern is as follows figure 2 shown, from figure 2 It can be seen that there are obvious O peaks and Fe peaks; its macroscopic morphology is shown in image 3 shown, from image 3 Visible air bubbles can be seen in the

[0038] Put 10 kg of industrial pure iron into a 20 kg induction furnace, turn it on to heat and melt it, and continue heating to a constant temperature of 1600°C;

[0039] Air is blown into the molten iron, and the mass fraction of dissolved oxygen is measured in real time with a temperature and oxygen measuring instrument. When the blowing amount...

Embodiment 2

[0046] An iron-oxygen alloy for adjusting the dissolved oxygen content of molten steel. The oxygen content is 0.15% by mass percentage, and exists in the form of supersaturated solid solution, bubbles and FeO, and the balance is Fe and unavoidable impurities.

[0047] Put 2t of industrial pure iron into a 3t electric furnace, turn it on to heat and melt it, and continue heating to a constant temperature of 1600°C;

[0048] Oxygen is blown into the molten iron, and the mass fraction of dissolved oxygen is measured in real time with a temperature and oxygen measuring instrument. When the blowing amount reaches 100 standard cubic meters, the heating is stopped, and the molten iron is cast into small pieces and cooled rapidly.

[0049] Sampling was carried out to detect the prepared ferrite alloy pieces, and the mass fraction of oxygen in the prepared ferrite alloy was analyzed to be 0.15%.

[0050] In the production process of ship plate steel E36 for high-energy welding in steel...

Embodiment 3

[0055] An iron-oxygen alloy for adjusting the dissolved oxygen content of molten steel. The oxygen content is 0.37% by mass percentage, and exists in the form of supersaturated solid solution, bubbles and FeO, and the balance is Fe and unavoidable impurities.

[0056] Put 1 ton of industrial pure iron into a 2 ton induction furnace, turn it on to heat and melt it, and continue heating to a constant temperature of 1560°C;

[0057] Oxygen is blown into the molten iron, and the mass fraction of dissolved oxygen is measured in real time with a temperature and oxygen measuring instrument. When the blowing amount reaches 30 standard cubic meters, the heating is stopped, and the molten iron is cast into small pieces and cooled rapidly.

[0058] Sampling was carried out to detect the prepared ferrite alloy pieces, and the mass fraction of the prepared ferrite alloy oxygen was analyzed to be 0.37%.

[0059] In the production process of ship plate steel E36 for high-energy welding in st...

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Abstract

The invention belongs to the technical field of smelting, and in particular relates to a ferritic alloy for adjusting content of dissolved oxygen in molten steel, and preparation and a usage method thereof. The preparation method comprises the steps of: heating a raw material of industrial pure iron, pig iron, scrap steel or low carbon steel to a liquid state; blowing in air or oxygen; when the dissolved oxygen reaches a saturated or supersaturated state, casting the liquid into balls or blocks; and cooling rapidly to obtain the ferritic alloy. A usage method is as below: when steel for high heat input welding is refined in a converter, determining mass fraction W (O) 0 of dissolved oxygen in molten steel with oxygen level to be adjusted; determining a target dissolved oxygen content w [O] T of the molten steel with oxygen level adjusted; calculating and determining the amount of ferritic alloy required to achieve the target value; and adding ferritic alloy in steel liquid and mixing. The method provided by the invention has the high utilization rate of ferritic alloy, stable and accurate oxygen control, and has the advantages of simpleness, fastness and accuracy.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to an iron-oxygen alloy for adjusting the dissolved oxygen content of molten steel and a preparation and use method thereof. Background technique [0002] Iron and steel materials are one of the most widely used and most important structural materials for human beings. People have never stopped studying the strengthening and toughening technologies and theories of iron and steel materials. In the 1930s, the theoretical strength of the material was proposed, that is, the maximum theoretical strength of the material can be achieved by making the material into a crystal completely free of macro-defects and micro-defects. Therefore, clean steel smelting used to be a hot spot in the field of iron and steel metallurgy, and various iron and steel enterprises try to reduce the impurities such as O and S in molten steel as much as possible. However, with the deepening of resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06
CPCY02P10/20
Inventor 战东平马江华张慧书姜周华龚伟
Owner 江苏星爵实业有限公司
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