CN103817301B - A kind of continuous crystallizer protecting slag for ultra-low-carbon steel - Google Patents
A kind of continuous crystallizer protecting slag for ultra-low-carbon steel Download PDFInfo
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- CN103817301B CN103817301B CN201410068317.9A CN201410068317A CN103817301B CN 103817301 B CN103817301 B CN 103817301B CN 201410068317 A CN201410068317 A CN 201410068317A CN 103817301 B CN103817301 B CN 103817301B
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Abstract
The invention discloses a kind of continuous crystallizer protecting slag for ultra-low-carbon steel, it by adding active carbon in covering slag, air can not only be made carbon rapid oxidation can be made to produce carbon dioxide by protection slag blanket discharge, and itself possess powerful adsorption function, store portion of air thus accelerate oxidation rate, make it after the rapid melting of guarantee covering slag, rapidly carbon is removed, make covering slag not carbon containing, prevent the generation of ultra-low-carbon steel carburetting phenomenon from source; After active carbon rapid oxidation, the consumption due to active carbon makes space disappear, and covering slag can, rapidly by steel billet seal isolation air, prevent steel billet to be again oxidized; The present invention is with low cost, good practical effect, is worthy to be popularized and application.
Description
Technical field
The invention belongs to steelmaking ingredient technical field, be specifically related to a kind of continuous crystallizer protecting slag for ultra-low-carbon steel.
Technical background
Ultra-low-carbon steel refers to phosphorus content for cold-rolled steel below 0.003%, and one of technological difficulties that this steel grade is produced are exactly the control to phosphorus content; Its complex manufacturing, manufacturing technology is strict, and external production technology is all protected with patent form, is regarded as the life of enterprise; Therefore the manufacturing technology of ultra low carbon steel slab and product quality are that the national special steel of measurement one is produced and one of important symbol of Sci-Tech Level.
Carbon is very large to the performance impact of ultra-low-carbon steel, and therefore carbon is harmful element in ultra-low-carbon steel, and in ultra-low-carbon steel, finished product carbon content should be low as far as possible; When developing ultra-low-carbon steel smelting process technology, in order to make the phosphorus content of acquisition be less than 0.003%, even lower ultra-low-carbon steel, its key becomes in the process of base to prevent molten steel recarburization to continuous casting after the level of decarburization and refining.
Covering slag plays vital effect on continuous casting process, and it has the functions such as thermal insulation, insulation, absorb inclusion, lubrication and heat transfer, is that continuous casting is produced upper important running stores and is the subject matter of carburetting in ultra-low-carbon steel, existing settling mode:
1. adopt other compounds to substitute carbonaceous material originally, prevent carburetting; Such as, what " exploitation of carbon-less protecting slag " one literary composition that document " iron and steel " 1978 No. 10 (p58-67) is published was introduced is the method substituting carbon materials in covering slag with BN; Patent US005356454A (Unexamined Patent 5-185195) also uses the method substituting carbon materials in covering slag with BN.What " about the research of carborundum as Mould Flux For Ultra-low Carbon Steel melting rate modifier " one literary composition of publishing of document " Shaoguan Univ.'s journal " the 3rd phase (p112-120) in 1998 was introduced is the method substituting carbon materials in covering slag with SiC; but; because this kind of substitute is expensive; and in use add the sintering tendency of covering slag, the stability of operation is declined; Therefore, the value do not applied on a large scale.
2. adopt strong reductant that it preferential is reacted with oxygen, carry out the contact of isolated C and oxygen with this, but due to its activity too strong, make to transport and the high cost of storage.
3. adopt fire retardant to delay the burning of C; Such as in CN1485168A, disclose a kind of protective slag for continuous super low carbon steel casting, by adding one or more in the fire retardants such as boron system, class ATH system, sodium aluminate in covering slag, its consumption accounts for the 0.5-5.0% of total amount, to delay the oxidation rate of carbon in covering slag, make its controlled melting speed of the more effective performance of the carbon in covering slag and play framework material, thus the addition of carbon in minimizing covering slag, reach the object preventing carbon pick-up in strand, effectively can realize the production of ultra-low-carbon steel; What it adopted is add fire retardant to prevent in this link carburetting to slow down oxidation of coal with this; but its phosphorus content reduces will affect burn-off rate; and the phenomenon of carburetting may be caused along with the consumption of fire retardant, therefore need a kind of more easy and effective covering slag to prevent the continuous crystallizer protecting slag of ultra-low-carbon steel carburetting.
Summary of the invention
Main purpose of the present invention is to provide a kind of continuous crystallizer protecting slag that effectively can prevent carburetting used for ultra-low-carbon steel.
The present invention by adding active carbon in covering slag; add the gas permeability of covering slag, accelerate the oxidation of carbon, make it fully oxidizedly can become carbon dioxide and get rid of; make the not carbon containing of the covering slag after melting, thus effectively avoid the problem that carbon containing causes ultra-low-carbon steel carburetting.
A kind of continuous crystallizer protecting slag for ultra-low-carbon steel; it is obtained by following raw material: 14 ~ 23 parts, glass dust, wollastonite 45 ~ 53 parts, 11 ~ 13 parts, fluorite, clinker 4 ~ 6 parts, active carbon 2 parts, 4 ~ 5 parts, sodium carbonate, sodium fluoride 4.5 parts, spodumene 3 parts, lithium carbonate 1 part, 0.2 ~ 2 part, adhesive, caustic-calcined magnesite 3 ~ 6 parts.
Adopt the covering slag that above-mentioned raw material are obtained, its chemical composition mass percent is: CaO:30% ~ 35%, SiO
2: 33% ~ 36%, MgO:3% ~ 6%, Al
2o
3: 1% ~ 5%, Na
2o:8% ~ 10%, F
-: 6% ~ 10%, C:3% ~ 8%.
Described its basicity CaO/SiO of a kind of continuous crystallizer protecting slag for ultra-low-carbon steel
2be 0.9 ~ 1.1, fusing point 1070 DEG C-1150 DEG C, viscosity 0.3 ~ 0.45Pa.s at 1300 DEG C.
Described adhesive is one or more in dextrin, carboxymethyl cellulose sodium, plant amylum.
Described active carbon is wooden column-shaped active carbon.
Beneficial effect of the present invention:
1. the bi-material layers adopting active carbon to come alternative traditional " carbon black+graphite " in the present invention joins carbon pattern, makes covering slag not only not affect burn-off rate, and it also avoid the phenomenon of the ultra-low-carbon steel carburetting caused when continuous casting.
2. active carbon has very large specific area; and the present invention adopts specific area to reach the wooden column-shaped active carbon of 1500 ㎡/g; make its gas permeability better; air can not only be made carbon rapid oxidation can be made to produce carbon dioxide by protection slag blanket discharge; and itself possess powerful adsorption function; store portion of air thus accelerate oxidation rate; make it after the rapid melting of guarantee covering slag; rapidly carbon is removed; make covering slag not carbon containing, thus prevent the generation of ultra-low-carbon steel carburetting phenomenon from source.
3. after active carbon rapid oxidation, the consumption due to active carbon makes space disappear, and makes covering slag rapidly by steel billet air-isolation, to prevent steel billet to be again oxidized.
Detailed description of the invention
The invention discloses a kind of continuous crystallizer protecting slag for ultra-low-carbon steel, now do following several groups of contrast tests:
First group: adopt equivalent and the identical ultra-low-carbon steel of technique is tested at continuous cast mold with three kinds of different covering slags respectively, result is as follows:
Note: this experiment is tested at 50 times that carry out on identical continuous cast mold 100KG Ultra-low carbon steel billet and remove mean value, adopt 1-5 represent, in cost 1 represent minimum, 5 represent maximum; In burn-off rate, 1 to represent the used time minimum, and 5 to represent the used time maximum; In carbon increasing amount, 0 representative not change, 1-5 representative has carbon increasing amount to become large successively.
Test us by first group and can find out that the application is relative to reducing agent class and fire retardant class covering slag; not only with low cost; and the burn-off rate used time is the shortest; in continuous cast mold, liquid slag layer is formed with the shortest time; and due in its not carbon elements of later stage; stopped the generation of carburetting phenomenon from source, this is reducing agent class and fire retardant class covering slag is to realize.
Second group: adopt wooden column charcoal and ature of coal column charcoal respectively, when other compositions are identical, the ultra-low-carbon steel making 100KG covering slag all identical to other conditions is respectively tested, and the data obtained is the numerical value of ultra-low-carbon steel per ton;
Note: this experiment is tested at 50 times that carry out on identical continuous cast mold 100KG covering slag and remove mean value, adopt 1-5 represent, in cost 1 represent minimum, 5 represent maximum; In burn-off rate, 1 to represent the used time minimum, and 5 to represent the used time maximum.
Although test us by second group can find out and be active carbon, but wooden column charcoal is relative to ature of coal column charcoal, although cost difference is little, but the burn-off rate of covering slag difference is larger, because the present invention possesses good gas permeability in fusion process, therefore burn-off rate likely can cause steel billet ingress of air to be oxidized slowly; And very large its of wooden column charcoal specific area directly has influence on the burn-off rate of covering slag and the mobility of air.
embodiment one:
For A factory ultra-low-carbon steel; continuous crystallizer protecting slag formula for raw stock of the present invention is adopted to be: 15.8 parts, glass dust, wollastonite 48 parts, 11.2 parts, fluorite, clinker 4.8 parts, active carbon 2 parts, 4.1 parts, sodium carbonate, sodium fluoride 4.5 parts, spodumene 3 parts, lithium carbonate 1 part, 1.9 parts, adhesive, caustic-calcined magnesite 3.7 parts.
Its main physical and chemical index result of laboratory test is as follows: CaO:31.89%, SiO
2: 35.24%, MgO:4.9%, Al
2o
3: 3.7%, Na
2o:8.5%, F
-: 8.6%, C:3.2%.
Basicity of the present invention and CaO/SiO
2be 0.9, fusing point 1093 DEG C and at 1300 DEG C viscosity 0.39Pa.s.
Open when watering starting, push in crystallizer by the covering slag after adjustment, through observation, steel liquid fluctuating is within 3mm, and pulling rate is stabilized in 0.6m/min, now measures liquid slag layer thickness about 10mm.After this survey a liquid slag layer every 20min, its thickness is at 8 ~ 12mm.In casting cycle, this covering slag is sprawled well in crystallizer, flare is moderate.Through statistics, this covering slag slag consumption is about 0.65Kg/ ton steel.Through measuring, equal with the carbon amounts in strand before revolving furnace continuous casting, there is not carburetting phenomenon.
case study on implementation two
Its formula for raw stock of covering slag adopted for the ultra-low-carbon steel of B factory is: 14.8 parts, glass dust, wollastonite 45.8 parts, 13.1 parts, fluorite, clinker 5.5 parts, active carbon 2 parts, 5.3 parts, sodium carbonate, sodium fluoride 4.5 parts, spodumene 3 parts, lithium carbonate 1 part, 1.9 parts, adhesive, caustic-calcined magnesite 3.1 parts.
Its main physical and chemical index result of laboratory test is as follows: CaO:34.9%, SiO
2: 33.2%, MgO:3.5%, Al
2o
3: 4.2%, Na
2o:7.2%, F
-: 5.3%, C:3.3%.
Covering slag basicity of the present invention and CaO/SiO
2be 1.05, fusing point 1131 DEG C, viscosity 0.46Pa.s at 1300 DEG C.
Open when watering starting, push in crystallizer by the covering slag after adjustment, through observation, steel liquid fluctuating is within 3mm, and pulling rate is stabilized in 0.6m/min, now measures liquid slag layer thickness about 11mm.After this survey a liquid slag layer every 20min, its thickness is at 7 ~ 12mm; In casting cycle, this covering slag is sprawled well in crystallizer, flare is moderate.Through statistics, this covering slag slag consumption is about 0.60Kg/ ton steel; Through measuring, equal with the carbon amounts in strand before revolving furnace continuous casting, there is not carburetting phenomenon.
case study on implementation three
My company produces for C factory ultra-low-carbon steel; produce continuous crystallizer protecting slag; its formula for raw stock is: 20 parts, glass dust, wollastonite 52 parts, 12.7 parts, fluorite, clinker 5.5 parts, active carbon 2 parts, 4.8 parts, sodium carbonate, sodium fluoride 4.5 parts, spodumene 3 parts, lithium carbonate 1 part, 1 part, adhesive, caustic-calcined magnesite 5 parts.
Its main physical and chemical index result of laboratory test is as follows: CaO:34.13%, SiO
2: 36.7%, MgO:6.1%, Al
2o
3: 2.9%, Na
2o:7.8%, F
-: 6.6%, C:3.5%.
Basicity of the present invention and CaO/SiO
2be 0.92, fusing point 1075 DEG C and at 1300 DEG C viscosity 0.33Pa.s.
Open when watering starting, push in crystallizer by the covering slag after adjustment, through observation, steel liquid fluctuating is within 3mm, and pulling rate is stabilized in 0.6m/min, now measures liquid slag layer thickness about 9mm.After this survey a liquid slag layer every 20min, its thickness is at 8 ~ 13mm.In casting cycle, this covering slag is sprawled well in crystallizer, flare is moderate.Through statistics, this covering slag slag consumption is about 0.63Kg/ ton steel.Through measuring, equal with the carbon amounts in strand before revolving furnace continuous casting, there is not carburetting phenomenon.
case study on implementation four
My company produces for D factory ultra-low-carbon steel; produce continuous crystallizer protecting slag; its formula for raw stock is: 14 parts, glass dust, wollastonite 44 parts, 11.1 parts, fluorite, clinker 4.5 parts, active carbon 2 parts, 4.4 parts, sodium carbonate, sodium fluoride 4.5 parts, spodumene 3 parts, lithium carbonate 1 part, 0.3 part, adhesive, caustic-calcined magnesite 3.1 parts.
Its main physical and chemical index result of laboratory test is as follows: CaO:35.22%, SiO
2: 37.18%, MgO:5.1%, Al
2o
3: 4.9%, Na
2o:8.1%, F
-: 7.51%, C:3.6%.
Basicity of the present invention and CaO/SiO
2be 0.95, fusing point 1013 DEG C and at 1300 DEG C viscosity 0.44Pa.s.
Open when watering starting, push in crystallizer by the covering slag after adjustment, through observation, steel liquid fluctuating is within 3mm, and pulling rate is stabilized in 0.6m/min, now measures liquid slag layer thickness about 9.7mm.After this survey a liquid slag layer every 20min, its thickness is at 7 ~ 13mm.In casting cycle, this covering slag is sprawled well in crystallizer, flare is moderate.Through statistics, this covering slag slag consumption is about 0.61Kg/ ton steel.Through measuring, equal with the carbon amounts in strand before revolving furnace continuous casting, there is not carburetting phenomenon.
Claims (3)
1. the continuous crystallizer protecting slag for ultra-low-carbon steel; it is obtained by following raw material: 14 ~ 23 parts, glass dust, wollastonite 45 ~ 53 parts, 11 ~ 13 parts, fluorite, clinker 4 ~ 6 parts, active carbon 2 parts, 4 ~ 5 parts, sodium carbonate, sodium fluoride 4.5 parts, spodumene 3 parts, lithium carbonate 1 part, 0.2 ~ 2 part, adhesive, caustic-calcined magnesite 3 ~ 6 parts.
2. the continuous crystallizer protecting slag for ultra-low-carbon steel according to claim 1, is characterized in that: described adhesive is one or more in dextrin, carboxymethyl cellulose sodium, plant amylum.
3. the continuous crystallizer protecting slag for ultra-low-carbon steel according to claim 1, is characterized in that: described active carbon is wooden column charcoal.
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| CN104646650A (en) * | 2015-02-03 | 2015-05-27 | 舞阳钢铁有限责任公司 | Ultra-low carbon covering slag used for 50t-level large flat ingot die casting |
| CN104624997B (en) * | 2015-03-04 | 2016-08-24 | 西峡龙成冶金材料有限公司 | A kind of boron-containing steel continuous crystallizer protecting slag |
| CN105772652B (en) * | 2016-03-23 | 2017-12-08 | 河南省西保冶材集团有限公司 | Ladle furnace lining cleaner special and its application method |
| CN107282903B (en) * | 2016-12-30 | 2019-04-05 | 西峡龙成冶金材料有限公司 | A kind of continuous super low carbon steel casting crystallizer protecting residue |
| CN111375736B (en) * | 2020-03-24 | 2022-06-17 | 山西太钢不锈钢股份有限公司 | Casting method of martensite precipitation hardening stainless steel |
| CN114395727A (en) * | 2021-12-02 | 2022-04-26 | 浦项(张家港)不锈钢股份有限公司 | Smelting and continuous casting process of martensite precipitation hardening stainless steel |
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| EP0723828A1 (en) * | 1995-01-27 | 1996-07-31 | SOLLAC (Société Anonyme) | Covering powder for a mold for continuous casting of steel, particularly for very low carbon steels |
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2014
- 2014-02-27 CN CN201410068317.9A patent/CN103817301B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6475157A (en) * | 1987-09-18 | 1989-03-20 | Kawasaki Steel Co | Continuous casting mold powder for extra-low carbon steel |
| EP0723828A1 (en) * | 1995-01-27 | 1996-07-31 | SOLLAC (Société Anonyme) | Covering powder for a mold for continuous casting of steel, particularly for very low carbon steels |
| JP2006007316A (en) * | 2004-06-23 | 2006-01-12 | Stollberg & Samil Co Ltd | Mold flux containing no fluorine component for continuous steel casting |
| CN101875095A (en) * | 2009-12-04 | 2010-11-03 | 武汉钢铁(集团)公司 | High-viscosity covering slag used for low-carbon aluminum-killed steel |
| CN103121089A (en) * | 2013-03-12 | 2013-05-29 | 西峡龙成冶金材料有限公司 | Colorful continuous casting crystallizer covering slag for ultra-low carbon steel |
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