CN101177723A - Method for controlling concentration of oxygen in molten steel - Google Patents

Method for controlling concentration of oxygen in molten steel Download PDF

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Publication number
CN101177723A
CN101177723A CNA2007101906155A CN200710190615A CN101177723A CN 101177723 A CN101177723 A CN 101177723A CN A2007101906155 A CNA2007101906155 A CN A2007101906155A CN 200710190615 A CN200710190615 A CN 200710190615A CN 101177723 A CN101177723 A CN 101177723A
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CN
China
Prior art keywords
powder
reductor
molten steel
ladle
steel
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CNA2007101906155A
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Chinese (zh)
Inventor
周建安
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Huatian Engineering and Technology Corp MCC
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Huatian Engineering and Technology Corp MCC
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Application filed by Huatian Engineering and Technology Corp MCC filed Critical Huatian Engineering and Technology Corp MCC
Priority to CNA2007101906155A priority Critical patent/CN101177723A/en
Publication of CN101177723A publication Critical patent/CN101177723A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for controlling oxygen concentration in liquid steel. The method utilizes a general powder injecting system; a powder injecting pipeline is connected on a gas permeable brick (1) which is arranged at the bottom of a ladle (2) so as to form a ladle powder injecting system; the shape of deoxidizer and an addition method thereof are changed, namely, the deoxidizer is made into micro-fine powder with the grain diameter smaller than 300 meshes, and the deoxidizer powder is added from the upper part of a power injecting tank (4) in the powder injecting system. Based on the existing argon stirring, the deoxidizer powder takes stirring air as a carrier and is conveyed through the powder injecting pipeline, and then is injected into the liquid steel through the gas permeable brick (1) at the bottom of the ladle (2) to carry out a deoxidation operation. The method not only has quick reaction speed, high metal receiving (can be improved 20-80 percent or even higher) and good production quality, but also effectively removes deoxidation outcome, precisely controls the addition quantity of the deoxidizer and has obviously economic benefit and no pollution.

Description

A kind of method of controlling oxygen concn in the molten steel
Technical field
The present invention relates to the ladle deoxidation refinery practice, especially relate to a kind of in the steel liquid deoxidation process method of reductor adding method and the oxygen level of control in the molten steel thereof.
Background technology
Bessemerize in the process at molten steel, the oxygen rifle is blown into a large amount of oxygen in the molten bath, when reaching blow end point, contains excessive oxygen in the molten steel.That is to say that actual oxygen content is higher than mean value in the steel.If do not carry out deoxidation, in tapping and casting process thereafter, along with the reduction of temperature, oxygen solubility in the molten steel reduces, and impels reaction between carbon and oxygen to proceed, and molten steel acutely seethes with excitement, not only make cast become difficult, and can not get the continuously cast bloom of correct solidification structure.The oxygen content in steel height also can produce subsurface porosity, defective such as loose, and the hot-short effect of aggravation sulphur, and in the process of setting of steel, oxygen is separated out in a large number with the form of oxide compound, can reduce the processing characteristicies such as plasticity, impelling strength of steel like this.
How much oxygen content in steel is one of important indicator of estimating steel quality, oxide inclusion in the steel what directly determine, and influence its size, shape and distribution, and the quality of steel billet and performance.Rational deoxidization technique, can require oxygen content in steel is reduced to desired level according to steel grade, the deoxidation products that generates can be discharged from molten steel, make finished product nonmetallic inclusionsin steel content few, be evenly distributed, form is suitable, also can obtain the fine grained structure tissue.
At present, the reductor adding method of deoxidation in steel making has " lumpy material method " and " injection feeding technology ".They all are that reductor is directly added molten steel from the ladle upper end, deoxidant element and the oxygen effect that is dissolved in the molten steel, and formed steady oxide with solid-state or liquid separating out, reaches the deoxidation purpose from molten metal.
The lumpy material addition method is that reductor is made bulk, directly drops into and carries out the deoxidation method of operating in the molten steel.Because reductor adds with the piece material, specific surface area is little, and recovery rate of iron is low and unstable, thereby is difficult to accurately reach the deoxidation target value, and is difficult for calculating reductor material add-on, causes the wasting of resources, and cost increases, and environment also is subjected to certain pollution.
The ladle feeding line method is made reductor the fine-grannular post-treatment exactly and is become cored-wire, it is imported in the molten steel on ladle top with certain speed by means of feeding wire machine then, thereby reach molten steel is carried out deoxidation, finally improve the quality of products, reduce the purpose of materials consumption.Advantages such as the yield of alloy of this technology is higher, and composition control is more accurate, and the molten steel cooling is few, and is low in the pollution of the environment.But it must carry out under the Argon technology cooperates.Deoxidation products may be deposited among the molten steel in addition, becomes non-metallic inclusion.If it is can not get rid of deoxidation products, still harmful to the performance of Finished Steel.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the method for oxygen concn in a kind of new control molten steel is provided, not only recovery rate of iron height, speed of response are fast, and can effectively get rid of deoxidation products and can accurately control the reductor add-on.
For achieving the above object, it is to adopt existing powder spraying system that the present invention controls in the molten steel method of oxygen concn, the pipeline that will dust is connected and forms the steel spraying powder system on the gas permeable brick that is located at ladle bottom, by changing the shape and the adding method thereof of reductor, reductor is made particle diameter less than 300 order fine powders, the powder spraying pot top of reductor powder from powder spraying system adds, on the basis that existing Argon stirs, the reductor powder is a carrier to stir gas, carry through the pipeline that dusts, spray into by the gas permeable brick that is arranged on ladle bottom and carry out the deoxidation operation in the molten steel.
Evenlyly and unobstructedly spray in the molten steel for ease of the reductor powder, the gas permeable brick that is arranged on ladle bottom adopts to dust uses ventilated element.
The present invention is in actually operating, the fine powder of reductor has increased reaction interface, shortened the steel liquid deoxidation operating time, combine with blowing process at the bottom of the gas, strengthened the mixing effect of molten steel, improve the dynamic conditions of metallurgical reaction, promote the degree that homogenizes that deoxidizer element and deoxidation products distribute in molten steel, help the smooth discharge of deoxidation products, can accurately reach steel grade requirement oxygen level target value, can stablize the quality and the performance that improve product made from steel.
The present invention compared with prior art its advantageous effect is as follows::
1) the reductor granularity is little, and specific surface area is big, and reaction interface is big, and speed of response is fast;
2) the reductor powder reacts in molten steel, and deoxidation speed is fast, efficient is high;
3) combine with end injection system, gas stirring guarantees effective discharge of deoxidation products, and makes the distributions such as non-metallic inclusion that residue in the molten steel even, improves the quality and the performance of steel;
4) powder spraying system combines with injection system, and the reductor powder directly adds molten steel and participates in reaction, can accurately control powder add-on and steel liquid deoxidation amount, saves cost, and remarkable in economical benefits is pollution-free.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 controls the orthographic plan of oxygen concn method system in the molten steel for realizing the present invention.
Embodiment
The system that controls oxygen concn method in the molten steel in realization the present invention shown in Figure 1 utilizes conventional powder spraying system, and the pipeline that will dust is connected and forms the steel spraying powder system on the gas permeable brick 1 that is located at ladle 2 bottoms.Reductor is made particle diameter less than 300 order fine powders, powder spraying pot 4 tops of reductor powder from powder spraying system add, on the basis that existing Argon stirs, the reductor powder with stir gas be carrier by carrying through the pipeline that dusts, spray into by the gas permeable brick 1 that is arranged on ladle 2 bottoms and to carry out the deoxidation operation in the molten steel.
The gas permeable brick 1 that is arranged on ladle 2 bottoms adopts to dust uses ventilated element, is convenient to the reductor powder and evenlyly and unobstructedly sprays in the molten steel.
Embodiment one:
Adopt the 100kW/150kg Medium frequency induction multifunctional high-temperature stove smelting high carbon chromium bearing steel GCr of standard in the laboratory 15SiMn, the molten steel amount is 100kg, its chemical ingredients C:1.2%, Mn:1.05%, Si:0.55%, P:0.015%, Cr:1.5%, final deoxygenation is inserted aluminium 100g, [0] 22ppm after testing.
Utilization the inventive method is carried out the aluminium-plated powder deep deoxidation in the end to this molten steel, and its operating process method is as follows: at first open vent valve 6, then open feed valve 5, less than 300 purpose aluminium powder reductors, 0.1m packs into the 1.2g granularity 3Metallurgy with in the powder spraying pot 4, inflation is forced into 0.3MPa; At this moment, a certain amount of aluminium powder reductor on opening for feed top adds powder spraying pot 4 by opening for feed, closes feed valve 5 and vent valve 6.Simultaneously pneumatic intake valve 7 is opened, and enters tracheae along separate routes, is divided into four the tunnel.The first via is pressurizeed by the aluminium powder reductor in 8 pairs of powder spraying pots of forcing pipe 4, and regulates pressure to required force value by pressure regulator valve 14; The second the tunnel enters the one-level fluidising chamber of powder spraying pot cone by one-level vapor lamp 9, bores intravital gasification installation by the powder jar and makes aluminium powder reductor fluidisation; Third Road enters mixing section 12 by secondary vapor lamp 11, makes aluminium powder reductor secondary fluidisation by the fluidizer in it; The four the tunnel blows away by the aluminium powder reductor of spray tube 10 with the fluidisation shape.The tank body internal pressure of waiting to dust reaches to be set when requiring, and opens bleeder valve 13, and powder spraying pot 4 is in the convey materials state, and the aluminium powder reductor is sprayed in the ladle 2.
After the aluminium powder reductor is carried and finished, proceed to blow and stir, after several minutes, the molten steel 3 in aluminium powder reductor and the ladle 2 fully reacts, and finishes deoxidation.Through check, [0] is 12ppm in the molten steel.
Embodiment two:
Certain Steel Complex's stove is smelted Pinion Steel SCM822H, is containing 20 tons of steel, and it contains C is 0.08%.Add a collection of pre-deoxidant during tapping, add-on is the 2.0kg/t steel, adopts proportioning to be: lime: fluorite: refractory brick blocks=refining slag refining in 800: 100: 100, and in time adjust according to the slag condition in the refining process.After fully stirring, sampling analysis.
[0] 20ppm in the steel after testing.
Utilization the technology of the present invention is carried out end spray to this molten steel and is contained the barium alloy deep deoxidation, and working method is identical with embodiment one, carries out deoxidation.Each injection parameter is:
Aluminum powder particle size: under 300 mesh sieves;
Reductor consumption: 24kg;
Jetting pressure: 0.2 5~0.50MPa;
Argon flow amount: 60~180L/min;
Through check, [0] is 14ppm in the molten steel.
Embodiment three:
Certain stove alloy smelting tool steel Cr of Steel Complex 12MoV is filling 20 tons, and its chemical ingredients is C:1.58%, Mn:0.27%, Si:0.30%, P:0.024%, Cr:11.75%, Mo:0.50%, V:0.23%.
Adopt the deoxidation of light current rock ballast method, the C granulated slag hold-time is not less than 30min, after the C granulated slag bleaches, adds a collection of Ca-Si powder, and add-on is the 1.0-1.5kg/t steel, and Ca-Si powder adding back bits bleach, the ferrochrome fine melt, and deoxidation is good.After fully stirring, get total analysis sample twice, 8-15min before the Cr12MoV tapping, V calculate by 0.25% and add Fe-V, and tapping temperature: 1500 ℃-1530 ℃, final deoxygenation is inserted aluminium 0.5kg/t steel.
[0] 36ppm in the steel after testing.
Adopt silicon, aluminium, barium, calcium, strontium, rare earth by a certain percentage as reductor, require its particle diameter less than 300 orders.
Utilization the technology of the present invention is carried out the end deep deoxidation that dusts to this molten steel, and working method is identical with embodiment one.Reductor consumption: 540g;
Through check, [0] is 21ppm in the molten steel.

Claims (2)

1. method of controlling oxygen concn in the molten steel, adopt the existing powder spraying system pipeline that will dust to be connected the gas permeable brick (1) that is located at ladle (2) bottom and to go up and form the steel spraying powder system, it is characterized in that: by changing the shape and the adding method thereof of reductor, reductor is made particle diameter less than 300 order fine powders, powder spraying pot (4) top of reductor powder from powder spraying system adds, on the basis that existing Argon stirs, the reductor powder is a carrier to stir gas, carry through the pipeline that dusts, spray into by the gas permeable brick (1) that is arranged on ladle (2) bottom and carry out the deoxidation operation in the molten steel.
2. a kind of method of controlling oxygen concn in the molten steel according to claim 1 is characterized in that: the described gas permeable brick (1) that is arranged on ladle (2) bottom adopts to dust uses ventilated element.
CNA2007101906155A 2007-11-27 2007-11-27 Method for controlling concentration of oxygen in molten steel Pending CN101177723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101906155A CN101177723A (en) 2007-11-27 2007-11-27 Method for controlling concentration of oxygen in molten steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101906155A CN101177723A (en) 2007-11-27 2007-11-27 Method for controlling concentration of oxygen in molten steel

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CN101177723A true CN101177723A (en) 2008-05-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104611511A (en) * 2015-02-02 2015-05-13 西安宝科流体技术有限公司 Intelligent argon bottom-blowing powder spraying control system of coreless induction furnace and control method thereof
CN109182640A (en) * 2018-09-20 2019-01-11 德龙钢铁有限公司 A method of reducing converter smelting endpoint carbon oxygen product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104611511A (en) * 2015-02-02 2015-05-13 西安宝科流体技术有限公司 Intelligent argon bottom-blowing powder spraying control system of coreless induction furnace and control method thereof
CN109182640A (en) * 2018-09-20 2019-01-11 德龙钢铁有限公司 A method of reducing converter smelting endpoint carbon oxygen product

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