CN101487076B - Core cabling wire for steel melting and preparation thereof - Google Patents

Core cabling wire for steel melting and preparation thereof Download PDF

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Publication number
CN101487076B
CN101487076B CN2009100103740A CN200910010374A CN101487076B CN 101487076 B CN101487076 B CN 101487076B CN 2009100103740 A CN2009100103740 A CN 2009100103740A CN 200910010374 A CN200910010374 A CN 200910010374A CN 101487076 B CN101487076 B CN 101487076B
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calcium
wire
cored
steel
percent
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CN101487076A (en
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郭庆成
范松涛
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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

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  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a cored-wire for making steel made by using waste slag and calcium slag of metal calcium produced by aluminothermy reduction method to replace reduced iron in the iron calcium cored-wire. The wire core components are as follows: 20 percent to 35 percent of metal calcium, 3 percent to 5 percent of metal magnesium, 60 percent and 75 percent of calcium slag and 2 percent to 4percent of passive lime. The cored-wire is used for vacuum device treatment of ultra-low carbon, low nitrogen and low hydrogen steel and calcium treatment after aluminium-deoxidizing, can further reduce the contents of Al2O3 inclusions in steel, lightens casting nozzle clogging and reduces the smelting cost.

Description

A kind of core cabling wire for steel melting and preparation method thereof
One, technical field
The present invention relates to refining of metal, particularly a kind of cored-wire that is used for the outer concise usefulness of steel melting furnace; The invention still further relates to the preparation method of this cored-wire.
Two, background technology
At present, the converter smelting carbon aluminium-killed steel all adopts metallic aluminium (or ferroaluminium) to make reductor, is used for taking off the free oxygen in the steel.Make reductor with aluminium, its deoxidation products is Al 2O 3, it is very big to the steel-making harm.Because Al 2O 3Fusing point height (2050 ℃) is tiny solid phase in molten steel, mutually wettability is poor, is difficult for that wadding is poly-grows up and come-up is removed, and forms Al at last in steel 2O 3Be mingled with, this inclusion has not plasticity-, can worsen steel product quality.Simultaneously, the Al that contains in the molten steel 2O 3Can make the continous casting sprue dross, cause nozzle clogging.
In order to remove the Al in the molten steel 2O 3, people utilize the avidity of calcium and oxygen strong, the CaO that calcium and oxygen reaction back generates can with Al 2O 3In conjunction with the 7Al that forms low melting point (1350 ℃) 2O 312CaO, the latter is liquid phase under the steel-making temperature, and wettability is good mutually, and poly-the growing up come-up that is easy to wad a quilt with cotton enters the top slag and is removed, thereby can reduce steel inclusion Al 2O 3These characteristics of content have been invented and used earlier aluminium deoxidation when the smelting low carbon aluminium killed steels, and the later stage is fed the so-called calcium treatment technology of calcium again, to Al 2O 3Carry out denaturing treatment.
The calcium treatment technology comprises the calcic pulvis is directly injected to the powder injection process in the molten steel and the calcic pulvis made cored-wire, feeds the injection feeding technology in molten steel deep with feeding wire machine.
For smelting ultralow-carbon, low nitrogen and low hydrogen steel grade, as X80-X100 oil pipeline steel and car panel steel, be before deoxidation, to handle with vacuum treatment installation earlier, use aluminium deoxidation then, carry out calcium with injection feeding technology more at last and handle.The cored-wire that generally uses at present is iron-calcium core-spun yarn, and its core is mixed and made into by the calcium metal of weight about 30% and about 70% reduced iron.Because will oxygenating in molten steel in the vacuum-treat process, make that molten steel oxygen level after the processing is general will to exceed a lot of times (oxygen level can be elevated to 600ppm by 30ppm) than what do not handle, behind aluminium deoxidation in the molten steel Al 2O 3Content is also than exceeding much of not handling, use above-mentioned iron-calcium core-spun yarn that this molten steel is carried out the calcium processing three shortcomings are arranged: the one, the general reduction of the reduced iron in the cored-wire is all incomplete, the ferric oxide that wherein has some amount, contact iron in the easy reducing iron oxides of moment calcium metal of molten steel jointly at itself and calcium, a part of calcium is lost in above this, has reduced the utilization ratio of calcium, reach the treatment effect of anticipation, must increase the feed quantity of calcium, steel-making cost is improved; The 2nd, only depend on calcium in the cored-wire generate behind the CaO again with molten steel in Al 2O 3Generate 7Al 2O 312CaO, and then wadding is poly-mutually, grows up, come-up enters in the slag, and speed is slower, make the Al in the molten steel 2O 3Fully removed, required time is longer, and for the molten steel of handling through vacuum unit, the timed interval of deoxidation and cast is confined shorter, can not satisfy this time requirement, so the Al in the molten steel 2O 3Can not fully be removed; The 3rd, the used starting material reduced iron price of this iron-calcium core-spun yarn is higher, and the cost of cored-wire is corresponding also higher.
Three, summary of the invention
At the above-mentioned shortcoming of iron-calcium core-spun yarn, the purpose of this invention is to provide a kind of cost lower, be specially adapted to above-mentionedly handle and end Al falls in the aluminium deoxidation molten steel through vacuum unit 2O 3The cored-wire of content and the preparation method of this cored-wire.
For realizing this purpose, the present invention is based on seeking a kind of material that can replace the used reduced iron of iron-calcium core-spun yarn.Require this material price cheap; Can make Al in the molten steel after entering molten steel 2O 3Generate 7Al with CaO 2O 312CaO speeds up, and floating interval of floating dock shortens; Itself can not cause new pollution to molten steel again.
The contriver is through a large amount of test and screening, and the waste residue-calcium slag that finally draws with thermit reduction production calcium metal replaces reduced iron manufacturing cored-wire ideal.
Cored-wire of the present invention, its core consists of by weight: calcium metal 20-35%, MAGNESIUM METAL 3-5%, thermit reduction is produced the calcium slag 60-75% of calcium, passive lime 2-4%.
The preparation method of cored-wire of the present invention is:
(1) described calcium ground-slag is broken, make the powder of particle less than 5mm;
(2) get particle less than the calcium metal of 3mm and MAGNESIUM METAL and the particle passive lime less than 1mm, the weight proportion of composing batching by described cored-wire core mixes;
(3) material of step (1) and step (2) is prepared burden by the weight proportion of composing of cored-wire core, mix, make core material;
(4) adopt the soft steel iron sheet to make the line skin, above-mentioned core material is made cored-wire with the cored-wire machine.
The MAGNESIUM METAL of 3-5% is the reaction promotor of calcium metal in the cored-wire of the present invention, can promote calcium and oxygen reaction, further improve the utilization ratio of calcium; The passive lime of 2-4% is the oxidation inhibitor of calcium metal, by its tiny particle granules of metal Ca is surrounded, and can reduce calcium metal oxidized chance of ingress of air in the envelope curve process.
Behind the cored-wire feeding molten steel of the present invention, calcium slag and calcium metal that it contains enter molten steel simultaneously.The fusing point of calcium slag is about 1350 ℃, and is lower than liquid steel temperature (1560～1620 ℃), enters to form full-bodied liquid slag group behind the molten steel rapidly, and its density is less than the density of molten steel, and can float to enter in the slag is removed, and there is not secondary pollution in molten steel.The little slag of this viscous fluid group is to the deoxidation products Al in the molten steel 2O 3Have extremely strong adsorptive power with CaO, under its effect, Al 2O 3Combine generation 7Al with CaO 2O 312CaO speeds up, and floating interval of floating dock shortens, and especially for the molten steel of handling through vacuum unit, can and pour into a mould in short pitch time, with deoxidation products Al in deoxidation 2O 3Remove to greatest extent, further improve the purity of molten steel, alleviate the nozzle clogging phenomenon, reduce Al in the steel 2O 3Be mingled with, improve steel product quality.
Because the calcium slag is a kind of industrial residue, as the raw material of producing cored-wire, refuse is utilized effectively it, not only reduce the manufacturing cost of cored-wire, but also reduced environmental pollution.
Use cored-wire of the present invention that molten steel is carried out calcium and handle,, consume and reduce, add that the cost of cored-wire own is lower, make the corresponding reduction of steel-making cost because the utilization ratio of calcium metal is mentioned.
Four, embodiment
Below by embodiment the present invention is further described.
Embodiment
Prepare cored-wire of the present invention according to the following steps:
(1) with calcium slag mechanical disintegration, sieves, make the powder of particle less than 5mm;
(2) get calcium grain 25 weight parts of particle less than 3mm, particle, mixes less than passive lime 3 weight parts of 1mm less than magnesium grain 4 weight parts of 3mm and particle, makes the composite powder of 32 weight parts;
(3) get powder 68 weight parts of step (1) and powder 32 weight parts of step (2) and mix, make the cored-wire core material;
(4) adopt the thin steel band of low-carbon cold rolling that 0.6mm is thick, 45mm is wide to make the line skin, above-mentioned core material is made the cored-wire of diameter 13mm with the cored-wire machine.
The weight of this cored-wire core consists of: calcium metal 25%, MAGNESIUM METAL 4%, calcium slag 68%, passive lime 3%.
This cored-wire is used for certain steel mill smelts X80 oil pipeline steel, in 150 tons of ladles, through feeding the 400m cored-wire with feeding wire machine behind RH vacuum-treat and the aluminium deoxidation, wire-feeding velocity 150m/ minute, feed iron-calcium core-spun yarn (calcic 25%, iron 75%, diameter 13mm down with equal conditions, feed quantity is identical with wire-feeding velocity), effect comparison such as following table:
The cored-wire kind Cored-wire price (unit/ton) Inclusion content of steel (mg/10kg) Nozzle clogging
Iron-calcium core-spun yarn 13000? 20.70? Have
Cored-wire of the present invention 10000? 14.40? Slightly
As seen from the above table, cored-wire of the present invention reduces more than 23% than the iron-calcium core-spun yarn cost; Adopt cored-wire of the present invention to use Al in the iron-calcium core-spun yarn steel 2O 3Content reduces by 30%; The nozzle clogging phenomenon alleviates.

Claims (2)

1. a core cabling wire for steel melting is characterized in that, this cored-wire core consists of by weight: calcium metal 20-35%, and MAGNESIUM METAL 3-5%, thermit reduction is produced the calcium slag 60-75% of calcium, passive lime 2-4%.
2. the preparation method of core cabling wire for steel melting according to claim 1 is characterized in that may further comprise the steps:
(1) described calcium ground-slag is broken, make the powder of particle less than 5mm;
(2) get particle less than the calcium metal of 3mm and MAGNESIUM METAL and the particle passive lime less than 1mm, the weight proportion of composing batching by described cored-wire core mixes;
(3) material of step (1) and step (2) is prepared burden by the weight proportion of composing of cored-wire core, mix, make core material;
(4) adopt the soft steel iron sheet to make the line skin, above-mentioned core material is made cored-wire with the cored-wire machine.
CN2009100103740A 2009-02-17 2009-02-17 Core cabling wire for steel melting and preparation thereof Active CN101487076B (en)

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Application Number Priority Date Filing Date Title
CN2009100103740A CN101487076B (en) 2009-02-17 2009-02-17 Core cabling wire for steel melting and preparation thereof

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CN101487076A CN101487076A (en) 2009-07-22
CN101487076B true CN101487076B (en) 2011-03-16

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102344989B (en) * 2010-08-06 2013-05-29 辽宁亚泰新型建材科技有限公司 Pretreatment method of molten iron for desulfurization by wire feeding method
CN103266197A (en) * 2013-06-06 2013-08-28 鞍钢股份有限公司 Composite calcium core-spun yarn and preparation method thereof
CN104711392B (en) * 2015-03-27 2016-06-22 马鞍山市兴达冶金新材料有限公司 A kind of production system being passivated pure calcium core-spun yarn

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