CN112322905A - Rare earth deoxidizer for low-aluminum steel electroslag and preparation method thereof - Google Patents
Rare earth deoxidizer for low-aluminum steel electroslag and preparation method thereof Download PDFInfo
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- CN112322905A CN112322905A CN202011160887.2A CN202011160887A CN112322905A CN 112322905 A CN112322905 A CN 112322905A CN 202011160887 A CN202011160887 A CN 202011160887A CN 112322905 A CN112322905 A CN 112322905A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a rare earth deoxidizer for low-aluminum steel electroslag with better deoxidizing effect than the existing deoxidizer and a preparation method thereof, which are suitable for producing steel with the content requirements of less than or equal to 0.10 percent of Si and less than or equal to 0.015 percent of Al, and the deoxidizer comprises the following chemical components in percentage by weight: the deoxidizer is prepared by putting iron and silicon into a melting furnace to be smelted into intermediate alloy, adding magnesium and rare earth, casting into an alloy block after melting, crushing the deoxidizer into 2-5mm granularity before use, baking the deoxidizer for more than 2 hours at 50-200 ℃, directly adding the deoxidizer into a crystallizer slag bath during electroslag remelting, adding rare earth alloy elements with strong oxygen affinity into the deoxidizer, wherein the deoxidizing effect is better than that of the conventional deoxidizer, the addition of magnesium can obviously reduce the quantity of impurities, and compared with the conventional production of electroslag ingots, the electroslag ingots produced by the deoxidizer for electroslag have the advantages of effective control of low silicon and low aluminum, and relatively lower oxygen content on finished products of the electroslag ingots.
Description
Technical Field
The invention belongs to the technical field of electroslag metallurgy, and particularly relates to a rare earth deoxidizer for low-aluminum steel electroslag, which has a better deoxidizing effect than the existing deoxidizer, and a preparation method thereof.
Background
In the electroslag remelting process of the electrode blank, because the slag contains a large amount of unstable oxides (FeO, MnO, SiO2 and the like), part of alloy elements in the steel can be oxidized and burned by high temperature to cause serious component segregation. The burning loss of easily-oxidized elements in steel causes element passing and waste products caused by chemical composition segregation not only bring huge economic loss, but also influence the quality of some products. In order to prevent the burning loss of easily-oxidized elements in the electroslag remelting process, unstable oxides in slag must be reduced, and the method usually adopted is to continuously add some alloy element deoxidizers with strong affinity with oxygen into a slag pool in the electroslag remelting process so as to stably control the total amount of unstable oxides in slag in the electroslag remelting process within a certain range. The common electroslag deoxidizer includes Al, Fe-Si, Ca-Si, SiAlBaCa, etc. and has the main function of reacting with unstable oxide and dissolved oxygen in slag steel to produce stable oxide and then entering slag. When the common deoxidizers are used for producing steel with low silicon (Si is less than or equal to 0.10%) and low aluminum (Al is less than or equal to 0.015%) content requirements, aluminum series deoxidizers cannot be used, while silicon series deoxidizers have poor reducing capability and serious oxygen increase in an electroslag process, so that the production requirements cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the existing deoxidizer and provide a rare earth deoxidizer for low-aluminum steel electroslag and a preparation method thereof, wherein calcium, silicon, rare earth and iron are made into alloy, the specific gravity of the alloy is increased, the vapor pressure of the alloy is reduced, and the alloy can sink into the interface of slag and steel, so that the utilization efficiency of the deoxidizer is improved.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a rare-earth deoxidant for electroslag of low-Al steel is suitable for preparing low-Si (less than or equal to 0.10%) and Al (less than or equal to 0.10%) products
0.015 percent of steel with low aluminum content requirement, wherein the deoxidizer comprises the following chemical components in percentage by weight: si 20-50%, Re 5-10%, Mg 2-10% and the balance of Fe.
The rare earth deoxidant for electroslag of low-aluminium steel is prepared through smelting Fe and Si in smelting furnace to obtain intermediate alloy, adding Mg and rare earth, smelting and casting.
Before the deoxidizer is used, the deoxidizer is crushed into a granularity of 2-5mm, then is baked for more than 2 hours at the temperature of 50-200 ℃, and is added into a slag pool of a crystallizer manually or directly through a feeding device during electroslag remelting.
The technical scheme of the invention has the following positive effects:
the deoxidizer is added with rare earth alloy elements with strong affinity with oxygen, so that a deoxidized product with large particles, low melting point, small density and easy floating is easily obtained, and the deoxidizing effect is better than that of the existing deoxidizer.
The deoxidizer is added with a proper amount of magnesium, so that the number of inclusions is obviously reduced, the form and the property of the inclusions are improved, and the deoxidizer has beneficial effects on the product performance. Magnesium is an ideal deoxidizer, but is easy to burn on the slag surface due to low melting point, flammability, small specific gravity, high vapor pressure and the like, is difficult to be directly added into slag liquid and molten steel, and cannot play a role in deoxidation. The invention aims to solve the problem, calcium, silicon, rare earth and iron are made into alloy, the specific gravity is increased, the vapor pressure is reduced, the alloy can sink into the interface of slag and steel, and the utilization efficiency of the deoxidizer is improved.
After the deoxidizer is used, the aluminum content in the electroslag ingot cannot be increased and can be reduced to some extent, aluminum inclusions caused by the increased aluminum content in the electroslag process can be effectively avoided, and the quality of the electroslag ingot is improved.
Because the deoxidizer contains alloy elements with strong reducing power such as rare earth, magnesium and the like, the rare earth and the magnesium preferentially react with unstable oxides in slag in the electroslag remelting process, and the silicon content in steel after electroslag cannot be greatly increased.
Detailed Description
Example (b): a rare earth deoxidizer for low-aluminum steel electroslag is suitable for producing steel with low silicon content less than or equal to 0.10% of Si and low aluminum content less than or equal to 0.015% of Al, and is specifically formed by mixing and casting iron, silicon, magnesium and rare earth, wherein the specific chemical components (weight percent) are as follows: si40.65%, Re8.76%, Mg9.55%, and the balance Fe.
A rare-earth deoxidant for electroslag of low-Al steel is prepared through smelting Fe and Si in smelting furnace to obtain intermediate alloy, adding Mg and rare-earth elements, smelting and casting.
When in use, the electrode blank is firstly crushed into particles with the particle size of 2-5mm, then the particles are baked for 2 hours at the temperature of 100 ℃, and a deoxidizer is uniformly added into a slag pool of a crystallizer according to the original silicon content of the electrode blank during electroslag remelting.
When 30CrNi3MoV was electroslag-remelted with the rare earth deoxidizer for electroslag in the present example, the deoxidizer was CaF2:Al2O3CaO is 60:20:20 ternary slag system, and the amount of added deoxidizing agent is 1.8kg per ton of steel.
The comparative test data of the electroslag ingot produced by adopting the common deoxidizer and the electroslag ingot produced by adopting the deoxidizer of the invention are as follows:
from the above table, it can be seen that: compared with the electroslag ingot produced by the traditional deoxidizer, the electroslag ingot produced by the rare earth deoxidizer in the embodiment has the advantages that Si and Al of the electroslag ingot can be controlled at lower levels, the control of low silicon and low aluminum in the electroslag process is effective, and the oxygen content in the finished product material of the electroslag ingot is obviously reduced.
Claims (3)
1. A rare earth deoxidizer for low-aluminum steel electroslag is suitable for producing steel with low silicon content of less than or equal to 0.10% of Si and low aluminum content of less than or equal to 0.015% of Al, and is characterized in that: the deoxidizer comprises the following chemical components in percentage by weight: 20-50% of Si, 5-10% of Re, 2-10% of Mg and the balance of Fe.
2. A method for producing a rare earth deoxidizer for electroslag of low-aluminum steel as claimed in claim 1, which is characterized in that: firstly, iron and silicon are put into a melting furnace to be melted into intermediate alloy, then magnesium and rare earth are added, and alloy blocks are cast after melting.
3. The method for producing a rare earth deoxidizer for electroslag of low-aluminum steel according to claim 2, wherein the deoxidizer is characterized in that: before the deoxidizer is used, the deoxidizer is crushed into a granularity of 2-5mm, then is baked for more than 2 hours at the temperature of 50-200 ℃, and is added into a slag pool of a crystallizer manually or directly through a feeding device during electroslag remelting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011160887.2A CN112322905A (en) | 2020-10-27 | 2020-10-27 | Rare earth deoxidizer for low-aluminum steel electroslag and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011160887.2A CN112322905A (en) | 2020-10-27 | 2020-10-27 | Rare earth deoxidizer for low-aluminum steel electroslag and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001051675A1 (en) * | 2000-01-13 | 2001-07-19 | Chulwoo Nam | Method for manufacturing composite deoxidizer of molten steel and the composite deoxidizer by using the method thereof |
| CN1456691A (en) * | 2003-05-26 | 2003-11-19 | 本溪冶炼厂 | Silicon-barium-strontium-calcium-magnesium-iron alloy as deoxidant in steelmaking |
| CN1548561A (en) * | 2003-05-14 | 2004-11-24 | 洛阳忠诚电力集团有限公司 | RESiMgCaFe alloy and its prepn |
| CN101139643A (en) * | 2007-11-06 | 2008-03-12 | 宁夏贺兰山铁合金有限责任公司 | Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer |
| CN104451029A (en) * | 2014-11-24 | 2015-03-25 | 中原特钢股份有限公司 | Silicon-calcium-barium-magnesium desoxidant for steelmaking and/or electroslag |
| CN107841598A (en) * | 2017-11-01 | 2018-03-27 | 马鞍山瑞辉实业有限公司 | A kind of cast steel deoxygenated alloy and its processing method and its application method |
-
2020
- 2020-10-27 CN CN202011160887.2A patent/CN112322905A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001051675A1 (en) * | 2000-01-13 | 2001-07-19 | Chulwoo Nam | Method for manufacturing composite deoxidizer of molten steel and the composite deoxidizer by using the method thereof |
| CN1548561A (en) * | 2003-05-14 | 2004-11-24 | 洛阳忠诚电力集团有限公司 | RESiMgCaFe alloy and its prepn |
| CN1456691A (en) * | 2003-05-26 | 2003-11-19 | 本溪冶炼厂 | Silicon-barium-strontium-calcium-magnesium-iron alloy as deoxidant in steelmaking |
| CN101139643A (en) * | 2007-11-06 | 2008-03-12 | 宁夏贺兰山铁合金有限责任公司 | Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer |
| CN104451029A (en) * | 2014-11-24 | 2015-03-25 | 中原特钢股份有限公司 | Silicon-calcium-barium-magnesium desoxidant for steelmaking and/or electroslag |
| CN107841598A (en) * | 2017-11-01 | 2018-03-27 | 马鞍山瑞辉实业有限公司 | A kind of cast steel deoxygenated alloy and its processing method and its application method |
Non-Patent Citations (2)
| Title |
|---|
| 储满生: "《钢铁冶金原燃料及辅助材料》", 31 January 2010, 北京冶金工业出版社 * |
| 薛正良等: "《特种熔炼》", 31 October 2018, 冶金工业出版社 * |
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