CN106893804A - A kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel - Google Patents
A kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel Download PDFInfo
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- CN106893804A CN106893804A CN201510961446.5A CN201510961446A CN106893804A CN 106893804 A CN106893804 A CN 106893804A CN 201510961446 A CN201510961446 A CN 201510961446A CN 106893804 A CN106893804 A CN 106893804A
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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
- C21C7/10—Handling in a vacuum
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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
- C21C7/0006—Adding metallic additives
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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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- 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
- C21C7/068—Decarburising
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Abstract
The present invention provides a kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel.The method comprising the steps of：（1）The oxygen-containing control of molten steel is in below 850ppm after bessemerizing end；（2）To adding metallurgy lime in ladle in converter tapping process；（3）Tapping adds the slag charge of 0.5-1.0Kg/t steel in the ladle top of the slag immediately after terminating；（4）Molten steel carries out vacuum decarburization treatment into RH refining furnaces, after RH refining furnace decarburizations 10min in vacuum tank to molten steel in add 1.0-1.5 Kg/t steel slag charge；（5）RH refining furnace decarburizations terminate rear molten steel oxygen in below 400ppm；（6）To in molten steel plus aluminium removes remaining oxygen, and add other alloys；（7）Molten steel circulates more than 5min, and treatment terminates, and molten steel goes continuous casting to cast.The present invention can reduce pollution of the oxygen in ladle top slag to molten steel using RH vacuum circulation degassings purifying method production hypoxemia ultra-low-carbon steel.
Description
Technical field：
The present invention relates to a kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel, belong to steelmaking technical field.
Background technology：
Ultra-low-carbon steel refers to steel of the carbon content below 0.01%, is also called IF steel（Gapless atomic steel）, with good deep drawability, for producing appliance plate, Automobile Plate.In order to ensure deep drawability and product surface quality, it is desirable to have relatively low oxygen content in product made from steel（Including simple substance oxygen and oxide）.The source of oxygen mostlys come from the oxygen in oxygen and molten steel in the ladle slag with steel contacts（Including oxide）.Due to needing the carbon removal in molten steel when RH is processed, so the simple substance oxygen in molten steel must be retained during converter tapping, using the reaction of carbon and oxygen by carbon removal, remaining simple substance oxygen is floated removal by adding the reducing agents such as aluminium to form the lighter oxide of proportion from molten steel.But just because of converter tapping not deoxidation, also results in oxygen in ladle slag（Exist in forms such as non-stable FeO, MnO）Content is also very high.RH decarburizations terminate, and add the molten steel that aluminium removes unnecessary simple substance oxygen, and in rear operation continuous casting casting cycle, the oxygen in ladle slag can be transmitted in molten steel, cause secondary oxidation of steel to pollute, and increased the oxygen content in molten steel.Its consequence one is to cause nozzle blocking in continuous casting casting cycle, influences the stability of casting cycle；Two is that oxygen content is raised in causing product made from steel, causes product quality to decline, or even produce waste product.
The oxygen content in how reducing ladle slag, to mitigate the biography oxygen to Ultra-low carbon molten steel, many researchs and improvement have all been done by each steel mill and some metallurgical universities and colleges.Common practice is：Add lime, tapping that the material containing metallic aluminium is added on the top of the slag after terminating in converter tapping process.Adding lime can dilute FeO, MnO in slag, add the oxide that oxygen can be combined into stabilization containing metallic aluminum material.But due to maintaining the oxygen content higher that rear operation RH decarburizations need in now molten steel, therefore still cannot will be reduced to very low contents level in slag.FeO, MnO are a problems to Ultra-low Carbon Molten Steel pollution in how reducing ladle slag.
Patent searching file finds, patent CN20091024872.3 is terminated in RH decarburizations, after adding metallic aluminium by oxygen removal unnecessary in molten steel, the slag charge containing metallic aluminium is added to ladle slag surface, the transmission for accelerating aluminium and oxygen is stirred by ladle argon-blown, to reduce the oxygen content in slag.Because the oxygen in now molten steel is removed completely, the oxygen content in ladle slag is very high, therefore the aluminium for adding, in addition to oxidation by air, remaining aluminium can be used to carry out the deoxidation of ladle top slag.But there is problems with this method：
（1）, ladle top slag outermost layer due to long-time exposure in atmosphere, cooling velocity is fast, and solid-state has been formed substantially, now adds alumina-bearing material, aluminium to be difficult to penetrate slag blanket, that is to say, that the part of liquid in slag blanket, really needs the part of deoxidation, and oxygen is difficult to effectively removal.Possible approach blows brokenly slag blanket when being stirring, and a part of aluminium is fallen into from gap, completes the deoxidation of top slag, but because the proportion of aluminium is lighter, 2.7kg/dm3, and the proportion of molten steel is 7.6kg/dm3, the aluminium of addition will be swum on molten steel face, the poor effect of actual deoxidation.
（2）, after RH treatment terminates carry out ladle argon-blown stirring, cause ladle slag blanket integrality to be destroyed, molten steel face is exposed in atmosphere, and the harmful element such as oxygen, nitrogen can transmit to molten steel, pollution molten steel.Once stirring intensity control is bad, ladle slag can be rolled into molten steel, and harm will be more serious；In addition, stirring can cause liquid steel temperature to decline.
CN200910251486.5 discloses another method for reducing ladle top slag oxidisability, and its way is：After adding fluorite and lime, tapping to terminate during converter tapping, ladle is transported to Argon station, carries out steel ladle bottom argon blowing stirring, is melted ladle slag using high-temperature molten steel, and the material containing aluminium is then added on the top of the slag.Because now ladle slag is molten condition, aluminium can play certain deoxidation effect, FeO, MnO in slag can be reduced into less than 5%.This method reduces the oxygen in the slag of top to a certain extent, but still suffers from problems with：
（1）As patent CN20091024872.3, the stirring of steel ladle bottom argon blowing argon destroys slag blanket, and molten steel face is exposed in atmosphere, and the harmful element such as oxygen, nitrogen can be transmitted to molten steel, pollutes molten steel.Once stirring intensity control is bad, ladle slag can be rolled into molten steel, and harm will be more serious.Equally, stirring will also result in liquid steel temperature decline.
（2）, by first carry out Bottom Argon Stirring by ladle slag melt, add alumina-bearing material, although serving certain deoxidation effect, but because BOTTOM ARGON BLOWING has been switched off when adding aluminium, deoxidation also only occurs in the part of slag and aluminium contact, and because the oxygen in molten steel is very high, the oxygen in molten steel can be transmitted in ladle top slag so that oxygen remains in level higher in slag.Using the method, FeO, MnO can be reduced to less than 5% in slag, can still cause secondary oxidation to pollute on molten steel.
The content of the invention
The purpose of the present invention is directed to above-mentioned problem and provides a kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel, and pollution of the oxygen in ladle top slag to molten steel can be reduced using RH vacuum circulation degassings purifying method production hypoxemia ultra-low-carbon steel.
Above-mentioned purpose is achieved through the following technical solutions：
A kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel, the method comprises the following steps：
（1）The oxygen-containing control of molten steel is in below 850ppm after bessemerizing end；
（2）To metallurgy lime is added in ladle in converter tapping process, addition is 1-1.5Kg/t steel；
（3）Tapping terminate after immediately the ladle top of the slag add 0.5-1.0Kg/t steel containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge；
（4）Molten steel carries out vacuum decarburization treatment into RH refining furnaces, after RH refining furnace decarburizations 10min in vacuum tank to molten steel in add 1.0-1.5 Kg/t steel containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge；
（5）RH refining furnace decarburizations terminate rear molten steel oxygen in below 400ppm；
（6）To in molten steel plus aluminium removes remaining oxygen, and add other alloys；
（7）Molten steel circulates more than 5min, and treatment terminates, and molten steel goes continuous casting to cast.
Beneficial effect：
（1）The present invention floats to the bottom of ladle top slag from this portion of material added in vacuum tank from molten steel, and a separation layer is just formd between ladle slag and molten steel, and separation layer thickness is 10mm or so.This separation layer has cut off the passage that the oxygen in ladle slag is transmitted to molten steel, even if the oxygen in the slag of top is not reduced to very low level, being also not concerned about it can aggravate the pollution of molten steel.
（2）Ladle top slag deoxidation material part is added from vacuum tank in RH application of vacuum, and the bottom of ladle top slag is floated to then as molten steel circulation.Bottom is and steel contacts to be kept molten by.Due to containing aluminium, the oxygen in slag can be sloughed.Also contain calcium oxide, the oxide of aluminum deoxidation generation can be adsorbed, purify molten steel.
（3）Control to bessemerize the oxygen in end molten steel and RH decarburizations terminate remaining oxygen in rear molten steel, reduce the total amount of the oxide generated during aluminum deoxidation.
（4）Using the present invention, the whole processing procedure ladle top of the slag keeps complete, and molten steel face will not be exposed, can prevent molten steel oxidation by air and nitrogen is sucked from air.
Specific embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only illustrative of the invention and is not intended to limit the scope of the invention.
A kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel, the method comprises the following steps：
（1）The oxygen-containing control of molten steel is in below 850ppm after bessemerizing end；
（2）To metallurgy lime is added in ladle in converter tapping process, addition is 1-1.5Kg/t steel；
（3）Tapping terminate after immediately the ladle top of the slag add 0.5-1.0Kg/t steel containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge；
（4）Molten steel carries out vacuum decarburization treatment into RH refining furnaces, after RH refining furnace decarburizations 10min in vacuum tank to molten steel in add 1.0-1.5 Kg/t steel containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge；
（5）RH refining furnace decarburizations terminate rear molten steel oxygen in below 400ppm；
（6）To in molten steel plus aluminium removes remaining oxygen, and add other alloys；
（7）Molten steel circulates more than 5min, and treatment terminates, and molten steel goes continuous casting to cast.
Application example：
The specific implementation case of hypoxemia ultra-low-carbon steel is below smelted for 250 tons of converters and RH：
（1）, to bessemerize end molten steel carbon be 0.025-0.05%, temperature is more than 1670 DEG C, and oxygen is 450-700ppm.
（2）, converter tapping starts after 1min to be directed at steel in tapping process to flow to metallurgy lime 300Kg added in ladle.
（3）, tapping terminate after immediately the ladle top of the slag add 250Kg containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge.
（4）, molten steel carry out vacuum decarburization treatment into RH, vacuum degree control is in below 0.27KPa.After RH decarburizations 10min in vacuum tank to molten steel in add 400 Kg contain aluminium, magnesia, calcium oxide, the slag charge of aluminum oxide.
（5）, after RH decarburizations 15min molten steel oxygen target in below 400ppm, target temperature is more than 1595 DEG C.
（6）, in molten steel plus aluminium removes remaining oxygen, add other alloys after circulation 2min.
（7）, molten steel recycling more than 5min, treatment terminates, and molten steel goes continuous casting to cast.
Hypoxemia ultra-low-carbon steel is produced using RH of the present invention, the oxygen content of steel is reduced to 23ppm, effect is significant from 27ppm.
Claims (1)
1. a kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel, it is characterized in that：The method comprises the following steps：
（1）The oxygen-containing control of molten steel is in below 850ppm after bessemerizing end；
（2）To metallurgy lime is added in ladle in converter tapping process, addition is 1-1.5Kg/t steel；
（3）Tapping terminate after immediately the ladle top of the slag add 0.5-1.0Kg/t steel containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge；
（4）Molten steel carries out vacuum decarburization treatment into RH refining furnaces, after RH refining furnace decarburizations 10min in vacuum tank to molten steel in add 1.0-1.5 Kg/t steel containing aluminium, magnesia, calcium oxide, aluminum oxide slag charge；
（5）RH refining furnace decarburizations terminate rear molten steel oxygen in below 400ppm；
（6）To in molten steel plus aluminium removes remaining oxygen, and add other alloys；
（7）Molten steel circulates more than 5min, and treatment terminates, and molten steel goes continuous casting to cast.
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| CN201510961446.5A CN106893804A (en) | 2015-12-21 | 2015-12-21 | A kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel |
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| CN201510961446.5A CN106893804A (en) | 2015-12-21 | 2015-12-21 | A kind of method that RH vacuum circulation degassings purifying method produces hypoxemia ultra-low-carbon steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505685A (en) * | 2022-09-05 | 2022-12-23 | 河钢乐亭钢铁有限公司 | Method for reducing oxidative damage of RH top slag of ultra-low carbon steel |
Citations (5)
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| CN101928809A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Modification method of RH molten steel refining ladle slag |
| CN101956131A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of ultra-low carbon steel and ultra-low carbon steel plate |
| CN102851435A (en) * | 2012-09-12 | 2013-01-02 | 首钢总公司 | Ultra-low-carbon, low-silicon and low-oxygen steel and smelting method thereof |
| CN103451349A (en) * | 2013-08-16 | 2013-12-18 | 河北钢铁股份有限公司邯郸分公司 | Control method for preventing nozzle clogging in casting process of ultra-low carbon-aluminium deoxidized molten steel |
| CN103937926A (en) * | 2014-03-26 | 2014-07-23 | 江苏省沙钢钢铁研究院有限公司 | Production method of ultra-low carbon steel and ultra-low oxygen content molten steel |
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- 2015-12-21 CN CN201510961446.5A patent/CN106893804A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928809A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Modification method of RH molten steel refining ladle slag |
| CN101956131A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of ultra-low carbon steel and ultra-low carbon steel plate |
| CN102851435A (en) * | 2012-09-12 | 2013-01-02 | 首钢总公司 | Ultra-low-carbon, low-silicon and low-oxygen steel and smelting method thereof |
| CN103451349A (en) * | 2013-08-16 | 2013-12-18 | 河北钢铁股份有限公司邯郸分公司 | Control method for preventing nozzle clogging in casting process of ultra-low carbon-aluminium deoxidized molten steel |
| CN103937926A (en) * | 2014-03-26 | 2014-07-23 | 江苏省沙钢钢铁研究院有限公司 | Production method of ultra-low carbon steel and ultra-low oxygen content molten steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505685A (en) * | 2022-09-05 | 2022-12-23 | 河钢乐亭钢铁有限公司 | Method for reducing oxidative damage of RH top slag of ultra-low carbon steel |
| CN115505685B (en) * | 2022-09-05 | 2023-08-25 | 河钢乐亭钢铁有限公司 | Method for reducing oxidizing hazard of RH top slag of ultra-low carbon steel |
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Application publication date: 20170627 |
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