CN101979672A - Method for ultra-deeply dephosphorizing in steel ladle - Google Patents
Method for ultra-deeply dephosphorizing in steel ladle Download PDFInfo
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- CN101979672A CN101979672A CN 201010501593 CN201010501593A CN101979672A CN 101979672 A CN101979672 A CN 101979672A CN 201010501593 CN201010501593 CN 201010501593 CN 201010501593 A CN201010501593 A CN 201010501593A CN 101979672 A CN101979672 A CN 101979672A
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Abstract
The invention discloses a method for ultra-deeply dephosphorizing in a steel ladle, which comprises the following steps in turn: (1) blowing in a converter in a normal mode, and before steel tapping of the converter, adding 7 to 9 kilograms of lime, 1.5 to 2.0 kilograms of fluorite and 3 to 5 kilograms of carbon steel dust-free briquette into each ton of molten steel in the steel ladle; (2) when steel is tapped from the converter, keeping the oxygen content of the molten steel less than 0.065 percent and the phosphorus content not more than 0.015 percent, preventing the molten steel from being deoxidized and alloyed, blowing argon at the bottom of the steel ladle and stirring in the whole steel tapping process, and keeping the blowing gas supply strength at the bottom of the steel ladle is 3.0 to 6.0L/min.t; and (3) blocking slag in steel tapping with the slag takeover being not more than 6kg/t and the temperature of the molten steel in the steel ladle not above 1,590 DEG C after the steel tapping, drossing with the slag content of the molten steel not more than 0.2 percent and after the drossing, heating the molten steel, deoxidizing, alloying and refining. When the method for ultra-deeply dephosphorizing in a steel ladle is used, the phosphorus content of the finished steel is as low as less than 0.003 percent.
Description
Technical field
The present invention relates to a kind of in ladle dephosphorization to ultralow method.
Background technology
Phosphorus is to the deleterious element of steel toughness, and it can significantly reduce the low-temperature impact toughness of steel, increases the intensity and the hardness of steel; The segregation of phosphorus in steel is more serious, makes the local organization of steel unusual easily, causes mechanical property inhomogeneous; Phosphorus also can cause corrosion fatigue and weld cracking.Therefore, there have in many steel grade requirement finished products phosphorus content realize to be ultralow, less than 0.003%.
Existing dephosphorizing method is: the first step, with the converter of packing into by a certain percentage of molten iron and steel scrap, blow by converter smelting mode normally, and the tapping pushing off the slag, molten steel is deoxidation alloying in ladle, skims after the tapping; The converter of packing into once more of second step, the molten steel after will skimming is blown by normally smelting mode of converter, the tapping pushing off the slag, and molten steel deoxidation alloying not in ladle is skimmed after the tapping, heats up then, continuous casting or die casting after the refining treatment such as deoxidation alloying.The existing method production cycle is long, the cost height, and do not reach some ultra-low phosphoretic steel to phosphorus content in the finished product less than 0.003% requirement, influence the performance and the quality of product.
Summary of the invention
Have in the ladle dephosphorization above-mentioned deficiency to ultralow method now for overcoming, the invention provides that a kind of dephosphorization is to ultralow method in ladle, dephosphorization is with short production cycle to ultralow method in this ladle, and cost is low, and phosphorus content can reach below 0.003% in the steel finished product.
Design of the present invention is, converter is blown by normal smelting mode, and key is before converter tapping, earlier lime, fluorite and carbon steel dust separation briquetting are added in the ladle, during tapping in the molten steel oxygen level be not less than 0.065%, phosphorus content is not more than 0.015%; Deoxidation alloying not in ladle, molten steel temperature is not higher than 1590 ℃ in the bag; Make full use of the tapping process dephosphorization, tapping whole process steel ladle bottom argon blowing stirs; The tapping pushing off the slag, tapping is skimmed after finishing, again to refining treatment such as molten steel heating, deoxidation alloyings, continuous casting or die casting afterwards.
The present invention's dephosphorization to ultralow method in ladle comprises following sequential steps:
The I converter is blown by normal smelting mode, before the converter tapping, earlier lime, fluorite and carbon steel dust separation briquetting are added in the ladle, add-on is respectively lime 7-9Kg/t, fluorite 1.5-2.0Kg/t, carbon steel dust separation briquetting 3-5Kg/t (molten steel add-on per ton).
During the II converter tapping, oxygen level is not less than 0.065% in the molten steel, and phosphorus content is not more than 0.015%; Molten steel deoxidation alloying not in ladle; Tapping whole process steel ladle bottom argon blowing stirs ladle bottom blowing air supply intensity 3.0-6.0L/min.t.
III tapping pushing off the slag, the following quantity of slag is not more than 6Kg/t (molten steel per ton); After the tapping, the molten steel ladle temperature is not higher than 1590 ℃ (general 1590 ℃-1590 ℃); After skimming, the band quantity of slag is not more than 2Kg/t in the molten steel; Skim finish after again to molten steel heat up, refining treatment such as deoxidation alloying.Continuous casting or die casting afterwards.
The present invention adopts lime, fluorite and carbon steel dust separation briquetting physical and chemical index as follows:
A lime physical and chemical index (mass percent) is
CaO≥90％； MgO≤5％； SiO
2≤2.5％； P≤0.02％；
S≤0.05%; Moisture content＜0.5%%; Give birth to burning+burning rate≤12%;
Granularity is not more than 50mm.
B fluorite physical and chemical index (mass percent) is:
CaF
2≥85％； SiO
2≤14％； P≤0.06％； S≤0.15％；
Moisture content＜0.5%; Granularity 10-50mm.
C carbon steel dust separation briquetting physical and chemical index (mass percent) is:
TFe≥45％；FeO≥45％；CaO≥10％； SiO
2≤5％；
P≤0.05%; S≤0.12%; Moisture content＜0.5%; Granularity 10-50mm.
The present invention is adapted to not have the converter steel factory of dephosphorization of molten iron equipment to produce ultra-low phosphoretic steel, converter is blown by normal smelting mode, before tapping, earlier lime, fluorite and carbon steel dust separation briquetting are added in the ladle, make full use of converter tapping process dephosphorization in ladle, shorten the converter production cycle; Make dephosphorizing agent with the carbon steel dust separation briquetting, low-cost dephosphorization can make the finished product phosphorus content less than 0.003%.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
Present embodiment carries out on 180 tons of combined blown converters, and used ladle bottom is equipped with 2 bottom blow supplying settings, and gas supply flow of single end is 700L/min to the maximum.The smelting steel grade is 9%Ni, and in GB24510-2009, the mass percent of its finished product composition sees Table 1.
Table 1
All the other are Fe and unavoidable impurities.
Lime, fluorite and carbon steel dust separation briquetting physical and chemical index that present embodiment adopts are as follows:
A lime physical and chemical index (mass percent) is
CaO?92％； MgO?3.6％； SiO
2?2.1％； P?0.019％；
S 0.035%; Moisture content 0.2%%; Give birth to burning+burning rate 10%;
Granularity is less than 50mm.
B fluorite physical and chemical index (mass percent) is:
CaF
2?87％； SiO
2?8.9％； P?0.053％； S?0.12％；
Moisture content 0.2%; Granularity 10-50mm.
C carbon steel dust separation briquetting physical and chemical index (mass percent) is:
TFe?46％； FeO?49％；?CaO?13％； SiO
2?3.1％；
P 0.046%; S 0.11%; Moisture content＜0.3%; Granularity 10-50mm.
Present embodiment is a following sequential steps:
The I converter is blown by normal smelting mode, before the converter tapping, earlier lime 1600Kg, fluorite 300Kg and carbon steel dust separation briquetting 850Kg is added in the ladle.
During the II converter tapping, oxygen level is 0.080% in the molten steel, phosphorus content 0.013%, deoxidation alloying not in ladle; The tapping whole process is carried out steel ladle bottom argon blowing and is stirred, and the ladle bottom blowing air supply intensity is 4.5L/min.t; Tapping time 5.5min, molten steel amount 200t.
Quantity of slag 1000Kg under the III tapping process; After the tapping, the molten steel ladle temperature is 1570 ℃; After skimming, band quantity of slag 200Kg in the molten steel; Skim finish after, molten steel is heated up and refining treatment such as deoxidation alloying, continuous casting afterwards.
The quality per distribution ratio of the composition of finished product (strand) is:
C?0.035％； Si?0.26％； Mn?0.64％； P?0.0014％； S?0.0016％；
Ni?9.26％； Al?0.026％； Cr?0.03％； Cu?0.002％； V?0.001％；
Mo 0.002%; All the other are Fe and unavoidable impurities.
Embodiment two
Present embodiment carries out on 180 tons of combined blown converters, and used ladle bottom is equipped with 2 bottom blow supplying settings, and gas supply flow of single end is 700L/min to the maximum.The smelting steel grade is DT4C, and in GB/T6983-2008, the mass percent of its chemical ingredients sees Table 2.
Table 2
All the other are Fe and unavoidable impurities.
Lime, fluorite and carbon steel dust separation briquetting physical and chemical index that present embodiment adopts are as follows:
A lime physical and chemical index (mass percent) is
CaO?93；?MgO?3.5；SiO
2?1.9；P?0.015；S?0.043％；
Moisture content 0.2; Give birth to burning+burning rate 9.2;
Granularity is less than 50mm.
B fluorite physical and chemical index (mass percent) is:
CaF
2?86％；SiO
2?6.7％；P?0.051％；S?0.11％；
Moisture content 0.2%; Granularity 10-50mm.
C carbon steel dust separation briquetting physical and chemical index (mass percent) is:
TFe?47％；?FeO?49％；?CaO?16％；?SiO
2?2.1％；
P 0.039%; S 0.095%; Moisture content 0.3%; Granularity 10-50mm.
Present embodiment is a following sequential steps:
The I converter is blown by normal smelting mode, before converter tapping, earlier lime 1460Kg, fluorite 300Kg and carbon steel dust separation briquetting 790Kg is added in the ladle.
During the II converter tapping, oxygen level is 0.072% in the molten steel, phosphorus content 0.012%, deoxidation alloying not in ladle; The tapping whole process is carried out steel ladle bottom argon blowing and is stirred, and the ladle bottom blowing air supply intensity is 4.3L/min.t; Tapping time 6min, molten steel amount 195t.
Quantity of slag 1030Kg under the III tapping process; After the tapping, the molten steel ladle temperature is 1580 ℃; After skimming, band quantity of slag 260Kg in the molten steel; Skim finish after, to molten steel heating, die casting after the RH refining treatment; The quality per distribution ratio of the composition of finished product is:
C?0.003％； Si?0.05％； Mn?0.12％； P?0.0016％； S?0.0018；
Al 0.68%; Ti 0.001%; Cr 0.03%; Ni 0.01% Cu 0.001%; All the other are Fe and unavoidable impurities.
Claims (2)
- One kind dephosphorization is to ultralow method in ladle, it comprises following sequential steps:The I converter is blown by normal smelting mode, before the converter tapping, earlier lime, fluorite and carbon steel dust separation briquetting is added in the ladle, and add-on is respectively lime 7-9Kg/t, fluorite 1.5-2.0Kg/t, carbon steel dust separation briquetting 3-5Kg/t;During the II converter tapping, oxygen level is not less than 0.065% in the molten steel, and phosphorus content is not more than 0.015%; Molten steel deoxidation alloying not in ladle; Tapping whole process steel ladle bottom argon blowing stirs ladle bottom blowing air supply intensity 3.0-6.0L/min.t;III tapping pushing off the slag, the following quantity of slag is not more than 6Kg/t; After the tapping, the molten steel ladle temperature is not higher than 1590 ℃; After skimming, the band quantity of slag is not more than 2Kg/t in the molten steel; Skim finish after again to molten steel heat up, the deoxidation alloying refining treatment.
- 2. according to claim 1 in ladle dephosphorization it is characterized in that adopting lime, fluorite and carbon steel dust separation briquetting physical and chemical index as follows to ultralow method:A lime physical and chemical index (mass percent) is:CaO≥90％；MgO≤5％； SiO 2≤2.5％； P≤0.02％；S≤0.05%; Moisture content＜0.5%%; Give birth to burning+burning rate≤12%;Granularity is not more than 50mm;B fluorite physical and chemical index (mass percent) is:CaF 2≥85％； SiO 2≤14％； P≤0.06％； S≤0.15％；Moisture content＜0.5%; Granularity 10-50mm;C carbon steel dust separation briquetting physical and chemical index (mass percent) is:TFe≥45％；FeO≥45％；CaO≥10％； SiO 2≤5％；P≤0.05%; S≤0.12%; Moisture content＜0.5%; Granularity 10-50mm.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031409A (en) * | 2012-08-17 | 2013-04-10 | 新疆八一钢铁股份有限公司 | Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace |
| CN103255264A (en) * | 2013-06-07 | 2013-08-21 | 鞍钢股份有限公司 | Method for dephosphorizing by using LF refining furnace |
| CN104060051A (en) * | 2014-03-13 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorizing method of molten steel |
| CN105886694A (en) * | 2016-07-04 | 2016-08-24 | 湖南华菱湘潭钢铁有限公司 | Ultra-low phosphorus moulded steel smelting method |
| CN106119464A (en) * | 2016-08-23 | 2016-11-16 | 唐山不锈钢有限责任公司 | A kind of dephosphorization method of converter band oxygen tapping |
| CN106148711A (en) * | 2015-04-19 | 2016-11-23 | 王虎 | A kind of metallurgical dust sludge simple and effective process technique |
| CN109207672A (en) * | 2018-12-03 | 2019-01-15 | 南阳汉冶特钢有限公司 | A kind of production method of Slagoff method and ultra-low phosphoretic steel in ultra-low phosphoretic steel production process |
| CN110935851A (en) * | 2020-02-18 | 2020-03-31 | 金华市婺银网络科技有限公司 | Equipment capable of preventing molten steel from rephosphorization in steel ladle |
| CN111663018A (en) * | 2020-05-29 | 2020-09-15 | 中天钢铁集团有限公司 | Ladle dephosphorization method |
| CN112280937A (en) * | 2020-09-27 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for deep dephosphorization by using dedusting ash |
| CN114235164A (en) * | 2021-12-03 | 2022-03-25 | 北京科技大学 | Thermal state monitoring system and method for empty ladle and tapping process of steel ladle |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031409B (en) * | 2012-08-17 | 2014-05-28 | 新疆八一钢铁股份有限公司 | Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace |
| CN103031409A (en) * | 2012-08-17 | 2013-04-10 | 新疆八一钢铁股份有限公司 | Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace |
| CN103255264A (en) * | 2013-06-07 | 2013-08-21 | 鞍钢股份有限公司 | Method for dephosphorizing by using LF refining furnace |
| CN104060051A (en) * | 2014-03-13 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorizing method of molten steel |
| CN104060051B (en) * | 2014-03-13 | 2016-08-10 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of liquid steel dephosphorization |
| CN106148711A (en) * | 2015-04-19 | 2016-11-23 | 王虎 | A kind of metallurgical dust sludge simple and effective process technique |
| CN105886694A (en) * | 2016-07-04 | 2016-08-24 | 湖南华菱湘潭钢铁有限公司 | Ultra-low phosphorus moulded steel smelting method |
| CN106119464A (en) * | 2016-08-23 | 2016-11-16 | 唐山不锈钢有限责任公司 | A kind of dephosphorization method of converter band oxygen tapping |
| CN109207672A (en) * | 2018-12-03 | 2019-01-15 | 南阳汉冶特钢有限公司 | A kind of production method of Slagoff method and ultra-low phosphoretic steel in ultra-low phosphoretic steel production process |
| CN110935851A (en) * | 2020-02-18 | 2020-03-31 | 金华市婺银网络科技有限公司 | Equipment capable of preventing molten steel from rephosphorization in steel ladle |
| CN111663018A (en) * | 2020-05-29 | 2020-09-15 | 中天钢铁集团有限公司 | Ladle dephosphorization method |
| CN111663018B (en) * | 2020-05-29 | 2022-02-01 | 中天钢铁集团有限公司 | Ladle dephosphorization method |
| CN112280937A (en) * | 2020-09-27 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for deep dephosphorization by using dedusting ash |
| CN114235164A (en) * | 2021-12-03 | 2022-03-25 | 北京科技大学 | Thermal state monitoring system and method for empty ladle and tapping process of steel ladle |
| CN114235164B (en) * | 2021-12-03 | 2024-04-19 | 北京科技大学 | Thermal state monitoring system and method for empty ladle and tapping process of ladle |
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Application publication date: 20110223 |