CN102335731B - 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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- CN102335731B CN102335731B CN201010236290.1A CN201010236290A CN102335731B CN 102335731 B CN102335731 B CN 102335731B CN 201010236290 A CN201010236290 A CN 201010236290A CN 102335731 B CN102335731 B CN 102335731B
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- continuous casting
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- mold 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 metallurgic auxiliary materials, particularly continuous casting mold flux for high-carbon cutting mold steel.
Background technology
Continuous casting covering slag is a kind of artificial synthetic auxiliary material that join in crystallizer in molten steel continuous casting process, cover molten steel surface.It is to contain CaO, SiO
2deng raw material, fluoride and containing Na material, in suitable ratio, join slag, at high temperature after fusing, make fritting powder, then allocate certain C material and various additive into, through mixing, after dry, make.
That covering slag mainly rises is lubricated, heat-insulation and heat-preservation, prevent the functions such as field trash in secondary oxidation, absorption molten steel, forms slag layer, sinter layer, enriched carbon layer, liquid slag layer four-layer structure on Mold face, and gross thickness is generally 40～60mm.Slag film between base shell and crystallizer is comprised of solid slag film and liquid slag film, and solid slag film is divided into again crystalline solid and vitreum.Crystalline solid is larger to the Heat Transfer Influence of initial solidification shell, and the main lubricate of vitreum.Along with the vibration of crystallizer, covering slag melting layer flows into the gap between base shell and crystallizer, and along with constantly carrying out of throwing, melting layer constantly flows into, and with stylish slag, is ceaselessly added.
Continuous casting is produced the initial stage because covering slag physical property 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 only has 0.20～0.28Kg/t.s; the lower limit of the minimum unit consumption in continuous casting process technical standard defined; while pouring into a mould the first stove, the melting layer thickness of covering slag is generally at 8-15mm; after two stoves, will reach 25～40mm, melting layer is clamminess simultaneously, poor fluidity; liquid covering slag flows into just lesser at crystallizer meniscus place; sometimes even cause disconnected slag, the even sticker type breakout that often bonds, has seriously affected the stable smooth operation of producing.
The Japan He Ge mountain 3# of steel mill slab caster adopts the fever type covering slag of containing calcium silicon alloy (CaSi) when the high-carbon steel of cast [C] %=0.6～1.1%, makes 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 continuous casting mold flux for high-carbon cutting mold steel, by adjusting 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 continuous casting casting cycle reach stable dynamic equilibrium; thereby in assurance crystallizer, slab initial solidification shell is lubricated; prevent from, because disconnected slag reason causes bonding or bleed-out accident occurs, reaching the object that high-carbon knife mold steel is produced stable smooth operation.
The kind of high-carbon knife mold steel mainly contains 50Mn, 65Mn etc.High-carbon knife mold steel, because carbon content is up to 0.50～0.79%, contains the alloys such as Cr, Ti simultaneously, and 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 molten steel.From Fe-C phasor known it belong to hypereutectoid steel; while being characterized in solidifying in crystallizer; the initial solidification shell contraction distortion of slab is very little; make meniscus radian become large; cause covering slag flow channel to narrow down; liquid covering slag flows into less and is inhomogeneous; it belongs to hypereutectoid steel; while solidifying in crystallizer, contraction distortion is little, makes meniscus radian become large; cause 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 easily produces base shell bonding phenomenon.In addition because high-carbon knife mold steel easily produces surface angle transverse fissure.As 65Mn, its high-temp plastic in the time of 700-800 ℃ is very poor, and the contraction percentage of area only has 25-12%, in the time of 800 ℃, touches the bottom 12%, easily produces face crack and implosion.Therefore the covering slag of such steel grade must consider to improve crystallization speed to reduce crystallizer meniscus place heat flow density simultaneously, thereby reduces strand angle transverse fissure.
For achieving the above object, technical scheme of the present invention is,
Continuous casting mold flux for high-carbon cutting mold steel, 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.
l; The basicity R of described covering slag is: 0.80～0.95.
In Composition Design of the present invention:
Reduce basicity R to 0.80-0.95, guarantee meltbility and the vitreum characteristic of covering slag.
Increase Na
2the content of O, F improves the mobility of covering slag, reduces viscosity, improves consumption, guarantees the characteristic of its low melting point simultaneously.
Increase simple substance carbon F.c to reducing 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.
The composition that above-mentioned raw materials is pressed to design, after mixing, balling-up, calcining, granulation, is processed into hollow spheres continuous casting covering slag.
Beneficial effect of the present invention
The present invention is by affect the adjustment of the covering slag component of the characteristic that knife mold steel produces, particularly by 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 continuous casting casting cycle reach stable dynamic equilibrium; improved mobility 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 in assurance crystallizer, slab initial solidification shell is lubricated; prevent from causing bonding or bleed-out accident occurring because of disconnected slag reason), reach the object that high-carbon knife mold steel is produced stable smooth operation.
When cast high-carbon knife mold steel, covering slag unit consumption has been brought up to 0.35-0.42Kg/t.s from 0.20-0.28Kg/t.s, and melting layer thickness has been reduced to 12-20mm from 25-40mm simultaneously; Bonding phenomenon disappears, and has guaranteed the stable smooth operation of the large production of continuous casting.
Implement after the present invention, continuous casting is produced corresponding steel grade and is kept without 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 will be further described.
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. continuous casting mold flux for high-carbon cutting mold steel, its chemical analysis percentage by weight is: CaO:28.0～29.0%, MgO:2～5%, SiO2:31.0～33.0%, Al
2o
3: 4～5%, Na
2o:8.0～9.0%, F:9～10%, LiO
2: 1.5～2.5%, simple substance carbon F.c2.2～2.8%, surplus ash content I.
l; The basicity R of described covering slag is: 0.80～0.95; When cast high-carbon knife mold steel, covering slag unit consumption is 0.35-0.42Kg/t.s, and melting layer thickness is 12-20mm simultaneously.
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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| Publication Number | Publication Date |
|---|---|
| CN102335731A CN102335731A (en) | 2012-02-01 |
| CN102335731B true CN102335731B (en) | 2014-03-19 |
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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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103223477B (en) * | 2013-05-14 | 2015-06-03 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN114951570B (en) * | 2021-02-26 | 2023-09-08 | 日照钢铁控股集团有限公司 | Using method of 45Mn high-carbon steel direct casting slag system |
| 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 |
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| CN102335731A (en) | 2012-02-01 |
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