CN101538635A - Method for controlling nitrogen and residual element in low carbon aluminium-killed cold-rolled steel produced by electric furnace - Google Patents
Method for controlling nitrogen and residual element in low carbon aluminium-killed cold-rolled steel produced by electric furnace Download PDFInfo
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- CN101538635A CN101538635A CN200910113302A CN200910113302A CN101538635A CN 101538635 A CN101538635 A CN 101538635A CN 200910113302 A CN200910113302 A CN 200910113302A CN 200910113302 A CN200910113302 A CN 200910113302A CN 101538635 A CN101538635 A CN 101538635A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for controlling nitrogen and residual element in low carbon aluminium-killed cold-rolled steel produced by an electric furnace, comprising the following steps of adopting an electromagnetic acetabula to suck up direct reduced iron, adding the iron in a material tank and weighing the weight of the iron, subsequently pouring the iron as well as the wasted steel in the material tank into the electric furnace together; wherein the adding amount of the direct reduced iron is 5%-25% of the weight of the total adding amount in the electric furnace and the direct reduced iron is arranged at the central position in the electric furnace. The method can effectively reduce the contents of the residual elements such as nitrogen, chrome, nickel, copper, and the like in the molten steel and improve the quality of the sheets.
Description
Technical field
The present invention relates to a kind of electric furnace and produce the smelting process of low-carbon (LC) al-killed cold-rolled steel, particularly nitrogen and residual element control method in the electric furnace production low-carbon (LC) al-killed cold-rolled steel.
Background technology
Under the effect of high-temperature electric arc, the dissolution rate of nitrogen ion in exposed molten steel is fast during electrosmelting.With full steel scrap is in the electrosmelting steel process of raw material, and under the condition of not handling through vacuum outgas, nitrogen content is generally 0.0080%～0.012% in the molten steel.Nitrogen in steel content height obviously reduces intensity rising, the plasticity of cold rolled sheet.In addition, steel scrap is through recycled for multiple times, and residual element such as chromium, nickel, copper constantly increase, and more can cause the intensity of cold rolled sheet and hardness to increase, and plasticity reduces, and is unfavorable for board materials production.
Summary of the invention
The object of the present invention is to provide a kind of electric furnace to produce nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, can effectively reduce nitrogen and residual element content in the steel, help the production of cold rolled sheet.
The object of the present invention is achieved like this: a kind of electric furnace is produced nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, adopt magneticchuck that direct-reduced iron is sucked up, pack into batch can and calculating the weight, steel scrap in batch can is thrown in the electric furnace then, the add-on of direct-reduced iron accounts for the 5%-25% of general assembly pan feeding weight in the electric furnace, and direct-reduced iron should be put into the place, centre to electric furnace.
Test shows that the direct-reduced iron ratio reduced the DeGrain of nitrogen in steel content and residual element content less than 5% o'clock; When the add-on of direct-reduced iron greater than 25% the time because that direct-reduced iron conducts heat is slow, the infusibility problem can appear, prolong tap to tap time, melting electric consumption increases.When the add-on of direct-reduced iron accounts for the 5%-25% of general assembly pan feeding weight in the electric furnace, residual element content is the obvious negative relation in direct-reduced iron ratio and the steel, be that the reduced iron ratio is big more, residual element content is just low more, the ratio that adds reduced iron is 20% o'clock, average chromium content has been reduced to 0.0292% by 0.0482% in the steel, has reduced by 65.1%; Average nickel concentration is reduced to 0.0429% by 0.0505%, has reduced by 17.1%; Average copper content has been reduced to 0.118% by 0.134%, has reduced by 13.6%.The eaf tapping point nitrogen content has been reduced to 0.0046% by 0.0052%, has reduced by 11.5%, and nitrogen content on average has been reduced to 0.0066% by 0.0081% in the steel finished product, has reduced by 18.5%.The content of nitrogen and residual element in the molten steel is controlled and regulated to the inventive method by the add-on of control direct-reduced iron, and this method is simple, and is easy to operate.Use the inventive method can effectively reduce residual element contents such as nitrogen element in the molten steel and chromium, nickel, copper, help sheet material is rolled, improve board quality.
Embodiment
A kind of electric furnace is produced nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, at first marks a place specially and be used to stack direct-reduced iron between the electrosmelting feed proportioning.With unloading truck automatically direct-reduced iron is transported between the electric furnace feed proportioning by raw material storage.Utilize the magnetic of direct-reduced iron, adopt magneticchuck that direct-reduced iron is sucked up, the batch can and calculating the weight of packing into, the steel scrap in batch can is thrown in the electric furnace then, and the batch can bottom has dog-house, and opening dog-house can feed intake.The add-on of direct-reduced iron accounts for the 5%-25% of general assembly pan feeding weight in the electric furnace, and direct-reduced iron should be put into the place, centre to electric furnace, caking in the time of can avoiding the direct-reduced iron fusing like this.
As the preferred add-on of direct-reduced iron of the present invention, the add-on of direct-reduced iron accounts for the 15%-23% of general assembly pan feeding weight in the electric furnace.
As the optimal addn of direct-reduced iron of the present invention, the add-on of direct-reduced iron accounts for 20% of the interior general assembly pan feeding weight of electric furnace.
Steel scrap can be divided into light-duty steel scrap and heavy-duty waste steel by shape.
Said direct-reduced iron is thrown in the electric furnace at twice, adds about 60% of described direct-reduced iron total amount for the first time, adds 50 tons of direct-reduced irons altogether if desired, should add 30 tons of left and right sides direct-reduced irons so for the first time.Add fashionable, direct-reduced iron is contained in the middle part of batch can, dress heavy-duty waste steel in the batch can bottom of direct-reduced iron below, because heavy-duty waste steel conducts electricity very well, help accelerating burn-off rate, adorn light-duty steel scrap in the batch can top of direct-reduced iron top,, help keeping consistence light, the heavy-duty waste steel burn-off rate like this because light-duty scrap melting speed is fast, fusing time short; According to concrete smelting situation, soon to the greatest extent molten when adding for the first time pan feeding, be when having formed the molten steel molten bath in the electric furnace, add direct-reduced iron once more, the secondary add-on of reduced iron accounts for about 40% of described direct-reduced iron total amount, general about 20 tons, these 20 tons of direct-reduced irons are contained in the bottom of batch can, dress heavy-duty waste steel and/or light-duty steel scrap can in the batch can top of direct-reduced iron top, owing to formed the molten bath in the electric furnace, therefore described steel scrap can be placed on the direct-reduced iron top and drop in the stove.
Claims (4)
1, a kind of electric furnace is produced nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, it is characterized in that: adopt magneticchuck that direct-reduced iron is sucked up, pack into batch can and calculating the weight, steel scrap in batch can is thrown in the electric furnace then, the add-on of direct-reduced iron accounts for the 5%-25% of general assembly pan feeding weight in the electric furnace, and direct-reduced iron should be put into the place, centre to electric furnace.
2, electric furnace according to claim 1 is produced nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, it is characterized in that: the add-on of direct-reduced iron accounts for the 15%-23% of general assembly pan feeding weight in the electric furnace.
3, electric furnace according to claim 1 is produced nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, it is characterized in that: the add-on of direct-reduced iron accounts for 20% of the interior general assembly pan feeding weight of electric furnace.
4, electric furnace according to claim 1 is produced nitrogen and residual element control method in the low-carbon (LC) al-killed cold-rolled steel, it is characterized in that: said direct-reduced iron is thrown in the electric furnace at twice, add for the first time about 60% of described direct-reduced iron total amount, direct-reduced iron is contained in the middle part of batch can, dress heavy-duty waste steel in the batch can bottom of direct-reduced iron below is adorned light-duty steel scrap in the batch can top of direct-reduced iron top; Soon molten to the greatest extent the time when for the first time adding pan feeding, add direct-reduced iron once more, secondary add-on accounts for about 40% of described direct-reduced iron total amount, and direct-reduced iron is contained in the bottom of batch can, adorns heavy-duty waste steel and/or light-duty steel scrap in the batch can top of direct-reduced iron top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910113302A CN101538635A (en) | 2009-04-28 | 2009-04-28 | Method for controlling nitrogen and residual element in low carbon aluminium-killed cold-rolled steel produced by electric furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910113302A CN101538635A (en) | 2009-04-28 | 2009-04-28 | Method for controlling nitrogen and residual element in low carbon aluminium-killed cold-rolled steel produced by electric furnace |
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| CN101538635A true CN101538635A (en) | 2009-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910113302A Pending CN101538635A (en) | 2009-04-28 | 2009-04-28 | Method for controlling nitrogen and residual element in low carbon aluminium-killed cold-rolled steel produced by electric furnace |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225453A (en) * | 2007-12-11 | 2008-07-23 | 新疆八一钢铁股份有限公司 | Electric furnace smelting method for low-carbon low-silicon steel |
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2009
- 2009-04-28 CN CN200910113302A patent/CN101538635A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225453A (en) * | 2007-12-11 | 2008-07-23 | 新疆八一钢铁股份有限公司 | Electric furnace smelting method for low-carbon low-silicon steel |
Non-Patent Citations (3)
| Title |
|---|
| 姜英禹: "110t电弧炉应用直接还原铁炼钢效果分析", 《新疆钢铁》 * |
| 姜英禹等: "110t电弧炉钢水氮含量的试验研究", 《新疆钢铁》 * |
| 穆保安等: "70t UHP DC EAF-LF-CC工艺生产ER50-6焊丝钢的实践", 《新疆钢铁》 * |
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Application publication date: 20090923 |