CN102335731A - Continuous casting mold flux for high-carbon cutting mold steel - Google Patents
Continuous casting mold flux for high-carbon cutting mold steel Download PDFInfo
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- CN102335731A CN102335731A CN2010102362901A CN201010236290A CN102335731A CN 102335731 A CN102335731 A CN 102335731A CN 2010102362901 A CN2010102362901 A CN 2010102362901A CN 201010236290 A CN201010236290 A CN 201010236290A CN 102335731 A CN102335731 A CN 102335731A
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- continuous casting
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- mold flux
- flux
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Abstract
The invention provides continuous casting mold flux for high-carbon cutting mold steel. The continuous casting mold flux comprises the following chemical components in percentage by weight: 28.0-29.0% of CaO, 2-5% of MgO, 31.0-33.0% of SiO2, 4-5% of Al2O3, 8.0-9.0% of Na2O, 9-10% of F, 1.5-2.5% of LiO2, 2.0-2.8% of elemental carbon F.c and the balance of ash content I.L; and the alkalinity R of the mold flux is 0.80-0.95%. The continuous casting mold flux has the beneficial effects that by adjusting the components of the mold flux affecting production characteristics of the cutting mold steel and particularly by adjusting the contents of the flux, F, LiO2 and elemental carbon, the melting point of the mold flux is lowered so as to achieve stable dynamic balance between the melting speed and the inflow speed of the mold flux during the continuous casting process, thus improving the fluidity and crystallization speed of the mold flux during the casting process of the cutting mold steel, lowering the melting speed of the mold flux, realizing stable continuous casting production of the cutting mold steel, ensuring lubricating property of an initial shell of a plate blank in a crystallizer, preventing adhesion or bleed-out accidents caused by slag breakage, and realizing stable and smooth production of the high-carbon cutting mold steel.
Description
Technical field
The present invention relates to continuous casting and use metallurgic auxiliary materials, particularly high-carbon knife mold steel is used continuous casting covering slag.
Background technology
Continuous casting covering slag is the synthetic auxiliary material of a kind of manual work that join in the crystallizer in the molten steel continuous casting process, cover molten steel surface.It is with containing CaO, SiO
2In raw material, fluoride and contain the Na material and join slag in suitable ratio, at high temperature process the fritting powder after the fusing, allocate certain C material and various additive then into, after mixing, drying, process.
That covering slag mainly rises is lubricated, heat-insulation and heat-preservation, prevent the functions such as field trash in secondary oxidation, the absorption molten steel, in crystallizer, forms slag layer, sinter layer, enriched carbon layer, liquid slag layer four-layer structure on the molten steel face, and gross thickness is generally 40～60mm.Slag film between base shell and the crystallizer is made up of solid slag film and liquid slag film, and the solid slag film is divided into crystalline solid and vitreum again.Crystalline solid is bigger to the heat transfer influence of initial solidification shell, and the main lubricate of vitreum.Along with the vibration of crystallizer, the covering slag melting layer flows into the slit between base shell and the crystallizer, and along with constantly carrying out of throwing, melting layer constantly flows into, and is ceaselessly added with stylish slag.
Continuous casting produces the initial stage because the covering slag rerum natura can not adapt to the requirement of high-carbon steel steel grade, the main chemical of covering slag (percentage by weight %): CaO:34.0～41.0%, MgO:3.5～5.5%, SiO
2: 26.5.0～33.5%, Al
2O
3: 6～7%, Na
2O:3.0～4.0%, F:3～6%, LiO
2: 0.9～1.9%, F.c:1.0～1.4%, surplus ash content.
The unit consumption of covering slag has only 0.20～0.28Kg/t.s, is in the lower limit of the minimum unit consumption of continuous casting process technical standard defined, and the melting layer thickness of covering slag is generally at 8-15mm when pouring into a mould first stove; Will reach 25～40mm after two stoves, melting layer is clamminess simultaneously, and is mobile poor; Liquid covering slag flows into just fewlyer at crystallizer meniscus place; Sometimes even cause disconnected slag, bonding even sticker type breakout often taking place, has seriously influenced the stable smooth operation of producing.
Japan and the brother mountain 3# of steel mill slab caster adopt the fever type covering slag that contains calcium-silicon (CaSi) when the high-carbon steel of cast [C] %=0.6～1.1%, make the covering slag unit consumption bring up to 0.36Kg/t.s from 0.28Kg/t.s.
Summary of the invention
The object of the present invention is to provide a kind of high-carbon knife mold steel to use continuous casting covering slag, through adjustment flux, F, LiO
2And the content of simple substance carbon; Reduce the fusing point of covering slag; Make its burn-off rate and inflow velocity in the continuous casting casting cycle reach the stable dynamic balance; Thereby the slab initial solidification shell is lubricated in the assurance crystallizer, prevents to reach the purpose that high-carbon knife mold steel is produced stable smooth operation because of disconnected slag reason causes bonding or the bleed-out accident takes place.
The kind of high-carbon knife mold steel mainly contains 50Mn, 65Mn etc.High-carbon knife mold steel because of carbon content up to 0.50～0.79%, contain alloys such as Cr, Ti simultaneously, fluidity molten steel is poor.The liquidus temperature of high-carbon knife mold steel is very low, generally at 1470～1480 ℃, makes to cover the covering slag fusing difficulty on the molten steel.Can know that from the Fe-C phasor it belongs to hypereutectoid steel, when being characterized in crystallizer, solidifying, the initial solidification shell contraction distortion of slab is very little; Make the meniscus radian become big, cause the covering slag flow channel to narrow down, liquid covering slag flows into less and is inhomogeneous; It belongs to hypereutectoid steel, and when in crystallizer, solidifying, contraction distortion is little; Make the meniscus radian become big, cause the covering slag flow channel to narrow down, liquid covering slag flows into less and is inhomogeneous; Thereby it is inhomogeneous that copper plate of crystallizer is conducted heat, and is easy to generate base shell bonding phenomenon.In addition because high-carbon knife mold steel is easy to generate the surface angle transverse fissure.Like 65Mn, its high-temp plastic in the time of 700-800 ℃ is very poor, and the contraction percentage of area has only 25-12%, in the time of 800 ℃, touches the bottom 12%, is easy to generate face crack and implosion.Therefore the covering slag of such steel grade must consider to improve crystallization speed simultaneously with reduction crystallizer meniscus place heat flow density, thereby reduces strand angle transverse fissure.
For achieving the above object, technical scheme of the present invention is,
High-carbon knife mold steel is used continuous casting covering slag, and its chemical analysis percentage by weight is: CaO:28.0～29.0%, MgO:2～5%, SiO
2: 31.0～33.0%, Al
2O
3: 4～5%, Na
2O:8.0～9.0%, F:9～10%, LiO
2: 1.5～2.5%, simple substance carbon F.c 2.0～2.8%, surplus ash content I.
LThe basicity R of said covering slag is: 0.80～0.95.
In composition design of the present invention:
Reduce basicity R to 0.80-0.95, guarantee the meltbility and the vitreum characteristic of covering slag.
Increase Na
2The content of O, F improves the flowability of covering slag, reduces viscosity, improves consumption, guarantees its low-melting characteristic simultaneously.
Increase simple substance carbon F.c in the hope of the reduction burn-off rate, thereby reduce melting layer thickness.Its consumption accounts for 2～2.8% of total amount.
Increase LiO
2Content, thereby the crystallization speed of raising covering slag.Its consumption accounts for 1.5～2.5% of total amount.
With above-mentioned raw materials by the design composition after mixing, balling-up, calcining, granulation, be processed into the hollow spheres continuous casting covering slag.
Beneficial effect of the present invention
The present invention passes through the adjustment to the covering slag component of the characteristic that influences the production of knife mold steel, particularly through adjustment flux, F, LiO
2And the content of simple substance carbon; Reduce the fusing point of covering slag; Make its burn-off rate and inflow velocity in the continuous casting casting cycle reach the stable dynamic balance; Improved flowability and the crystallization speed of covering slag when cast knife mold steel, reduce covering slag melting speed, realized the stability that knife mold steel continuous casting is produced, thereby guarantee lubricating of slab initial solidification shell in the crystallizer; Prevent to cause bonding or the bleed-out accident takes place because of disconnected slag reason), reach the purpose that high-carbon knife mold steel is produced stable smooth operation.
The covering slag unit consumption has been brought up to 0.35-0.42Kg/t.s from 0.20-0.28Kg/t.s when cast high-carbon knife mold steel, and melting layer thickness has been reduced to 12-20mm from 25-40mm simultaneously; The bonding phenomenon disappears, and has guaranteed the stable smooth operation of the big production of continuous casting.
After the embodiment of the present invention, continuous casting is produced corresponding steel grade and is kept no bonding steel leakage accident record, and benefit, slab quality etc. all can obviously be improved.
The specific embodiment
Below in conjunction with embodiment the present invention is further specified.
Table 1 is embodiments of the invention.
Table 1 unit: percentage by weight
| Embodiment | CaO | MgO | SiO 2 | Al 2O 3 | Na 2O | F | LiO 2 | F.c | Ash content |
| 1 | 28 | 5 | 33 | 4 | 8 | 9 | 1.5 | 2 | Surplus |
| 2 | 28 | 4 | 31 | 5 | 9 | 10 | 1.5 | 2.8 | Surplus |
| 3 | 29 | 3 | 33 | 5 | 8 | 9 | 2.0 | 2.5 | Surplus |
| 4 | 29 | 2 | 32 | 4 | 9 | 10 | 2.5 | 2.2 | Surplus |
| 5 | 28 | 5 | 33 | 5 | 9 | 9 | 2.3 | 2.5 | Surplus |
Claims (1)
1. high-carbon knife mold steel is used continuous casting covering slag, and its chemical analysis percentage by weight is: CaO:28.0～29.0%, MgO:2～5%, SiO
2: 31.0～33.0%, Al
2O
3: 4～5%, Na
2O:8.0～9.0%, F:9～10%, LiO
2: 1.5～2.5%, simple substance carbon F.c 2.0～2.8%, surplus ash content I.
LThe basicity R of said covering slag is: 0.80～0.95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010236290.1A CN102335731B (en) | 2010-07-26 | 2010-07-26 | Continuous casting mold flux for high-carbon cutting mold steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010236290.1A CN102335731B (en) | 2010-07-26 | 2010-07-26 | Continuous casting mold flux for high-carbon cutting mold steel |
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| CN102335731A true CN102335731A (en) | 2012-02-01 |
| CN102335731B CN102335731B (en) | 2014-03-19 |
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ID=45511819
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| CN201010236290.1A Active CN102335731B (en) | 2010-07-26 | 2010-07-26 | Continuous casting mold flux for high-carbon cutting mold steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN112872304A (en) * | 2021-02-26 | 2021-06-01 | 日照钢铁控股集团有限公司 | Slag system for direct casting of high-carbon steel 45Mn and use method thereof |
| CN113414358A (en) * | 2021-05-24 | 2021-09-21 | 舞阳钢铁有限责任公司 | Production method for improving yield of low-Si alloy steel plate |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4190444A (en) * | 1978-02-01 | 1980-02-26 | The Clay Harden Company | Continuous casting mold flux powers |
| US4303120A (en) * | 1978-02-01 | 1981-12-01 | The Clay Harden Company | Continuous casting mold flux powders |
| CN1275102A (en) * | 1998-07-21 | 2000-11-29 | 品川白炼瓦株式会社 | Molding powder for continuous casting of thin slab |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN101612652A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | A kind of mold powder for continuous casting of low nickel and high manganese stainless steel and preparation method thereof |
| CN101733377A (en) * | 2010-01-20 | 2010-06-16 | 广州珠江钢铁有限责任公司 | Continuous casting mold fluxes for medium-high carbon steel and alloy steel |
-
2010
- 2010-07-26 CN CN201010236290.1A patent/CN102335731B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4190444A (en) * | 1978-02-01 | 1980-02-26 | The Clay Harden Company | Continuous casting mold flux powers |
| US4303120A (en) * | 1978-02-01 | 1981-12-01 | The Clay Harden Company | Continuous casting mold flux powders |
| CN1275102A (en) * | 1998-07-21 | 2000-11-29 | 品川白炼瓦株式会社 | Molding powder for continuous casting of thin slab |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN101612652A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | A kind of mold powder for continuous casting of low nickel and high manganese stainless steel and preparation method thereof |
| CN101733377A (en) * | 2010-01-20 | 2010-06-16 | 广州珠江钢铁有限责任公司 | Continuous casting mold fluxes for medium-high carbon steel and alloy steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN112872304A (en) * | 2021-02-26 | 2021-06-01 | 日照钢铁控股集团有限公司 | Slag system for direct casting of high-carbon steel 45Mn and use method thereof |
| CN113414358A (en) * | 2021-05-24 | 2021-09-21 | 舞阳钢铁有限责任公司 | Production method for improving yield of low-Si alloy steel plate |
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| CN102335731B (en) | 2014-03-19 |
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