CN102615259A - Protective material for non-oriented clean silicon steel continuous casting crystallizer for nuclear power unit - Google Patents
Protective material for non-oriented clean silicon steel continuous casting crystallizer for nuclear power unit Download PDFInfo
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- CN102615259A CN102615259A CN2012101027074A CN201210102707A CN102615259A CN 102615259 A CN102615259 A CN 102615259A CN 2012101027074 A CN2012101027074 A CN 2012101027074A CN 201210102707 A CN201210102707 A CN 201210102707A CN 102615259 A CN102615259 A CN 102615259A
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Abstract
The invention discloses protective material for a non-oriented clean silicon steel continuous casting crystallizer for a nuclear power unit, which comprises, in mass percentage, 70% of premelting material (the premelting material comprises, in mass percentage, 26-32% of SiO2, 39-45% of CaO, 6.5-10.5% of R2O, 5.5-8.5% of F- and 5-12% of MgO.), 7% of fine glass powder, 3% of manganese carbonate, 11.5% of fluorite, 3% of sodium fluoride, 4% of lithium carbonate and 1.5% of imported carbon black. The protective material is produced by Henan Xibao Smelt Material Group Co., Ltd based on the above research. Flied tests show that the protective material in the crystallizer is uniform in melting, low in slag circle, thickness of melt cinder under normal casting speed is 10-12 mm, consumption of the protective material for per ton of steel is 0.4-0.6 Kg, free scarfing rate on surface of casting blank can reach more than 98%, and accordingly quality of the casting blank and continuous casting efficiency are enhanced.
Description
Technical field:
The present invention's metallurgic auxiliary materials technical field of serving a ball, particularly a kind of nuclear power generating sets are with there not being the continuous-casting crystallizer especially used protective material of the clean silicon steel of orientation.
Background technology:
Silicon steel also is electrical sheet; The full name electrician uses silicon plate; It is the indispensable important magnetically soft alloy of electric power, electronics and war industry; Also be the maximum metal material of output, mainly, be widely used in motor, generator, transformer, electromagnetic mechanism, relay electronic device and the measuring instrument as the iron core of various motors, generator and transformer.Its complex manufacturing, manufacturing technology is strict, and external production technology is all protected with the patent form, is regarded as the life of enterprise.Silicon is the good deoxidier of steel, and it combines with oxygen, makes oxygen change the stable SiO of carbon reduction that is not into
2, avoided making the distortion of lattice of iron because of oxygen atom mixes.Resistivity is increased, help simultaneously objectionable impurities carbon is separated.Therefore, general impure iron can improve magnetic conductivity after adding silicon, reduce coercivity and iron loss.But the silicon content increase can make material hardens become fragile again, and thermal conductivity and toughness descend, and is unfavorable to heat radiation and machining, so the silicon content of general silicon steel sheet is no more than 4.5%.That silicon steel sheet divides is cold rolling, two kinds of hot rollings, and using more is cold-reduced silicon sheet.Cold-reduced silicon sheet has good magnetic property along rolling direction, not only in high-intensity magnetic field, has high saturation magnetic flux density and low iron loss, and good magnetic is also arranged in low-intensity magnetic field, and initial permeability is big.This is that impurity content reduces in the steel disc because the cold-rolling process process makes, and in steel disc, causes coarse grain, causes magnetic conductivity to increase, and magnetic hystersis loss reduces.
Nuclear power, water power, thermoelectricity all need be used silicon steel, and wherein nuclear energy power generation equipment mainly uses the high grade non-oriented silicon steel sheet.There are Wuhan Iron and Steel Plant, Baosteel and Anshan iron and steel plant etc. in the domestic steel mill that can manufacture this high-end product also in minority at present.Through making great efforts for many years, Baosteel is successfully developed the high grade non-oriented silicon steel product of different series and specification.Baosteel non-oriented electrical steel sales volume was 1,090,000 tons in 2009, domestic market occupation rate 22.4%.The output of Wuhan Iron and Steel Plant non-orientation silicon steel output and high trade mark rate kind thereof doubles the first half of the year in 2010 especially.Following along with the nuclear power facility at home continue to increase input, nuclear power will significantly increase with the demand of steel, more enterprise is permeating with the rings territory to nuclear power, nuclear power generating equipment domesticizes improves constantly the use of also supporting homemade steel.Steel for nuclear power pressure equipment is very special on environment for use, bear the extremely strong irradiation of reactor core.The nuclear power steel containment vessel is last one overcoat of nuclear island, and is very great to the safe meaning of nuclear island.Therefore, high to performance requirements such as the metallurgical quality of nuclear power steel and physics, mechanics, quality.
Summary of the invention:
For realizing the object of the invention, described nuclear power generating sets comprise fritting material (composition of fritting material and quality percentage composition: SiO with there not being the continuous-casting crystallizer especially used protective material of the clean silicon steel of orientation
226.0～32.0%, CaO 39.0～45.0%, R
2O 6.5～10.5%, F
-5.5～8.5%, MgO 5.0～12%), thin glass dust, manganese carbonate, fluorite, sodium fluoride, lithium carbonate, import carbon black, its quality percentage composition is respectively 70.0%, 7%, 3%, 11.5%, 3%, 4.0%, 1.5%.
Li in the described protective material
2The quality percentage composition of O is 2.0～3.0%, dual alkalinity (CaO/SiO
2) be 0.70～0.85, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
230.5～36.5%, CaO 24.0～30.0%, Al
2O
39.0%～12%, Na
2O 8.5～12.5%, F
-4.2～6.2%, MgO 3.0%～11%, Fe
2O
30.5%～4.0%, viscosity (PaS/1300 ℃): 0.2～0.4.
The Wuhan Iron and Steel Plant conticaster provides basic design by VAI (VAI); Unit fellowship designs such as middle smelting continuous casting, Belgian Vesuvius Co.,Ltd, Wuhan Iron and Steel Plant designing institute and Wuhan Iron and Steel Plant Automation Co., Ltd; Be that the straight arc Curved Continuous represent international most advanced level rectifys conticaster, bag quick change submersed nozzle in the employing, hydraulic oscillating mould, dynamically softly depress, dynamically secondary cooling water control, crystallizer on-line width modulation, Curved Continuous rectifys international state-of-the-art technologies such as roller row layout.Because nuclear power is low with the non-orientation silicon steel phosphorus content; The interior base shell of crystallizer receives that frictional resistance is big in the big casting cycle of crack sensitivity; Be prone to warning of base shell and crystallizer wall bonding and strand seminess, so claimed material is good even with heat transfer to lubricating of strand.
Because silicone content is high in the silicon steel, has increased the thermal resistance of steel, thereby has reduced its thermal conductivity.Under protective condition, the crystallizer hot-fluid is lower than other steel grade with the carbon amount in the casting process, and sheet billet continuous casting thickness width is big, and molten steel time of staying in crystallizer, more traditional slab was short, and crystallizer outlet base shell is thinner, causes bulge and bleed-out easily.Therefore special demands silicon steel protective material will have good thermal conductivity.Protective material flux composition characteristic is Na
2Low and the F of O
-Height can cause cuspidine (3CaO 2SiO
2CaF
2) separate out; It is higher that the basicity of design is suitably surveyed basicity, can cause cacoclasite (2CaOAl
20
3Si0
2) separate out.The glass property that makes slag of these high-melting-point things is damaged, and has worsened the lubrication of slag film.Basicity increases, and crystalline phase increases in the protective material solid slag film.Radiant heat accounts for the 5O% of total heat flux in the crystallizer heat flow, and the crystallization of protective material is obstructed radiant heat transfer, and effective thermal conductivity reduces.Simultaneously, protective material has micropore to generate in crystallisation procedure does, and thermal resistance is increased, and setting temperature rises, and solid rate increases in the slag film, also makes its thermal conductivity factor reduce.In addition, crystallization can also cause slag film surface roughening, increases the discontinuous air gap between slag film and crystallizer wall, thereby increases the interface resistance of crystallizer wall and slag film, reduces thermal conductivity.Therefore to the silicon steel protective material, its vitrifying rate requires very high.
General protective material hemisphere point (1150 ℃) is too high.Usually, slab protective material hemisphere is o'clock between 1000～1100 ℃, and the hemisphere point of protective material has determined the thickness of solid slag film.The hemisphere point of protective material reduces, and the solid slag film thickness reduces, and causes the protective material thermal resistance to reduce, thereby remedies the big deficiency of thermal resistance in the silicon steel, promotes crystallizer hot-fluid in the casting process, guarantees the production direct motion.
The protective material burn-off rate is more suitable.Must guarantee the protective material consumption in the production,,, keep suitable liquid slag layer thickness, improve the consumption of protective material, guarantee it and in casting process, realize evenly lubricated so need to accelerate the protective material burn-off rate because the slab pulling rate is fast.Contain oxidant Fe in the protective material
2O
3, purpose is for the C in the oxidation enriched carbon layer slag, reduces the non-orientation silicon steel molten steel recarburization.Oxidant can increase the oxidisability of slag and to the biography oxygen speed of molten steel, when steel. and stronger mass transfer takes place when movable in the slag interface, and disturbance takes place easily at the interface, and the protective material molten slag layer fluctuates thereupon, has promoted the slag circle to grow up.Contain a certain amount of Cr in the non-orientation silicon steel, the Cr in molten steel
2O
3Get into slag, particularly the Cr in the oxidisability slag possibility oxidation molten steel generates Cr
2O
3Get into slag, absorb Cr if protective material can not dissolve very much
2O
3, the slag at meniscus place also is easy to solidify formation slag circle; Molten steel is through after the vacuum refining; It is lower that molten steel is mingled with content, and carbon content of molten steel is low, therefore requires protective material must melt evenly; Have efficiently heat insulation effect and avoid the protective material fusing inhomogeneous with secondary oxidation of steel and tie cold steel phenomenon, reduced the cleanliness factor of slag film lubrication property and molten steel.In order to guarantee the lubricated ability with absorbing foreign matter of strand, basicity R value is taken at 0.7～0.85, and viscosity Control is at 0.3Pa S, and fusing point is controlled between 1050～1080 ℃ the consumption with the assurance protective material, protective material performance indications selection result such as following table:
Protective material performance indications table (1)
| Basicity | Fusing point/℃ | Viscosity/PaS | Consumption per ton of steel/Kg |
| 0.70 ～0.85 | 1050～1080 | 0.2～0.4 | 0.45～0.60 |
For under the lower situation of basicity, improve the heat transfer and the lubricity of protective material, except adopting the pre-melted slag type, also utilize multiple combined material to reduce fractional melting and improve uniformly transfer heat.
Form the influence that divides protective material
Composition by designing in the table (1) is observed the protective material situation of change, is satisfying under the prerequisite of fusion temperature, and the adding of this particular components also can reduce white alkali addition.
Joining the carbon pattern confirms
Research shows; Add the densified speed that carbonaceous material can reduce protective material in the protective material; Thereby the sintering that suppresses protective material, in the used in test carbonaceous material, the effect that carbon black reduces densification rate is superior to graphite; But, silicon steel must guarantee to avoid secondary carburetting phenomenon inside the molten steel because belonging to ultra-low-carbon steel; Therefore experimental result shows that import carbon black effect is best, adds 1.5% import carbon black, can effectively control the burn-off rate of protective material and avoid molten steel recarburization effectively to improve the heat insulation effect in the crystallizer.
Therefore protective material is joined the C direct election and is joined the C pattern with import, is specially 1.5% import C and deceives, and through the actual production test, slag layer thickness is 10～12mm in the crystallizer like this, and steel protective material consumption per ton is 0.4～0.6Kg/T, can satisfy the production demand.
Experimental study
Through above-mentioned development test, design the Wuhan Iron and Steel Plant nuclear power generating sets with not having the clean silicon steel protective material of orientation, leading indicator such as following table:
| SiO 2 | Al 2O 3 | CaO | F — | R 2O | C Gu | Fusing point/℃ | Viscosity/PaS | The R value |
| 33.5 | 6.2 | 27.0 | 5.2 | 10.5 | 0.95 | 1060 | 0.32 | 0.80 |
Experimental result
According to the above table composition, the protective material of being designed drawout preferably in crystallizer, fusing evenly, the top of the slag is active, the slag circle of generation is few, liquid slag layer thickness is 10-12mm, slag consumption per ton is 0.45～0.60Kg/ ton.The casting billet surface of pouring into a mould does not have the cleaning rate and is more than 98%, and strand is subcutaneous and internal soundness is good, all can meet the demands.
Protect this protective material that smelting material Group Co.,Ltd produces with above-mentioned result of study by the west, Henan Province; Field trial shows that the protective material of development melts evenly, the slag circle is few in crystallizer, melt cinder thickness is 10～12mm during normal pulling rate; Steel consumption per ton is 0.40～0.60Kg; Casting billet surface does not have the cleaning rate and reaches more than 98%, has effectively improved slab quality, improves casting efficiency.
The specific embodiment
Embodiment one:
A kind of nuclear power generating sets comprise fritting material (composition of fritting material and quality percentage composition: SiO with there not being the continuous-casting crystallizer especially used protective material of the clean silicon steel of orientation
226.0～32.0%, CaO 39.0～45.0%, R
2O 6.5～10.5%, F
-5.5～8.5%, MgO 5.0～12%), thin glass dust, manganese carbonate, fluorite, sodium fluoride, lithium carbonate, import carbon black, its quality percentage composition is respectively 70.0%, 7%, 3%, 11.5%, 3%, 4.0%, 1.5%.
Li in the described protective material
2The quality percentage composition of O is 2.7%, and all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
231.5%, CaO 29.0%, Al
2O
39.0%, Na
2O 12.0%, F
-4.3%, MgO 10%, Fe
2O
31.5%, viscosity (PaS/1300 ℃): 0.2～0.4.
Embodiment two
A kind of nuclear power generating sets comprise fritting material (composition of fritting material and quality percentage composition: SiO with there not being the continuous-casting crystallizer especially used protective material of the clean silicon steel of orientation
226.0～32.0%, CaO 39.0～45.0%, R
2O 6.5～10.5%, F
-5.5～8.5%, MgO 5.0～12%), thin glass dust, manganese carbonate, fluorite, sodium fluoride, lithium carbonate, import carbon black, its quality percentage composition is respectively 70.0%, 7%, 3%, 11.5%, 3%, 4.0%, 1.5%.
Li in the described protective material
2The quality percentage composition of O is 2.5%, and all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
235.5%, CaO 25.5%, Al
2O
312%, Na
2O 9.5%, F
-6.0%, MgO 5%, Fe
2O
34.0%, viscosity (PaS/1300 ℃): 0.2～0.4.
Embodiment three
A kind of nuclear power generating sets comprise fritting material (composition of fritting material and quality percentage composition: SiO with there not being the continuous-casting crystallizer especially used protective material of the clean silicon steel of orientation
226.0～32.0%, CaO 39.0～45.0%, R
2O 6.5～10.5%, F
-5.5～8.5%, MgO 5.0～12%), thin glass dust, manganese carbonate, fluorite, sodium fluoride, lithium carbonate, import carbon black, its quality percentage composition is respectively 70.0%, 7%, 3%, 11.5%, 3%, 4.0%, 1.5%.
Li in the described protective material
2The quality percentage composition of O is 2.8%, and all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
233.5%, CaO 28.0%, Al
2O
311%, Na
2O 10.5%, F
-5.2 MgO 7%, Fe
2O
32.0%, viscosity (PaS/1300 ℃): 0.2～0.4.
Claims (3)
1. nuclear power generating sets are with there not being the continuous-casting crystallizer especially used protective material of the clean silicon steel of orientation; It is characterized in that: it comprises the fritting material; Thin glass dust, manganese carbonate, fluorite, sodium fluoride, lithium carbonate, import carbon black; Its quality percentage composition is respectively 70.0%, 7%, 3%, 11.5%, 3%, 4.0%, 1.5%, and wherein the composition of fritting material and quality percentage composition are SiO
226.0～32.0%, CaO 39.0～45.0%, R
2O 6.5～10.5%, F
-5.5～8.5%, MgO 5.0～12%.
2. protective material as claimed in claim 1 is characterized in that: Li in the said protective material
2The quality percentage composition of O is 2.0～3.0%, and all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
230.5～36.5%, CaO 24.0～30.0%, Al
2O
39.0%～12%, Na
2O 8.5～12.5%, F
-4.2～6.2%, MgO 3.0%～11%, Fe
2O
30.5%～4.0%, viscosity (PaS/1300 ℃): 0.2～0.4.
3. according to claim 1 or claim 2 protective material is characterized in that: Li in the said protective material
2The quality percentage composition of O is 2.8%, and all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
233.5%, CaO 28.0%, Al
2O
311%, Na
2O 10.5%, F
-5.2 MgO 7%, Fe
2O
32.0%, viscosity (PaS/1300 ℃): 0.2～0.4.
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Cited By (5)
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| CN103381475A (en) * | 2013-07-23 | 2013-11-06 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer protective material dedicated for high-corrosion-resistance Mn steel for oil platform |
| CN104399921A (en) * | 2014-11-13 | 2015-03-11 | 北京首钢股份有限公司 | Casting powder |
| CN106735023A (en) * | 2016-12-30 | 2017-05-31 | 河南省西保冶材集团有限公司 | A kind of continuous-casting crystallizer especially used function protective material of hyperoxia glassed steel |
| CN108723313A (en) * | 2018-06-29 | 2018-11-02 | 洛阳普拉斯自动化科技装备有限公司 | The covering slag of high grade cold rolling silicon steel |
| CN112247088A (en) * | 2020-10-31 | 2021-01-22 | 江苏沙钢集团有限公司 | Silicon steel crystallizer covering slag |
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| CN106735023B (en) * | 2016-12-30 | 2019-04-05 | 河南省西保冶材集团有限公司 | A kind of continuous-casting crystallizer especially used function protective material of hyperoxia glassed steel |
| CN108723313A (en) * | 2018-06-29 | 2018-11-02 | 洛阳普拉斯自动化科技装备有限公司 | The covering slag of high grade cold rolling silicon steel |
| CN112247088A (en) * | 2020-10-31 | 2021-01-22 | 江苏沙钢集团有限公司 | Silicon steel crystallizer covering slag |
| CN112247088B (en) * | 2020-10-31 | 2022-03-11 | 江苏沙钢集团有限公司 | Silicon steel crystallizer covering slag |
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Effective date of registration: 20140402 Address after: 474500 Xixia, Henan Province River Road, No. 412, No. Patentee after: Henan xibao metallurgy meterials group co.,ltd. Patentee after: Xixia County Xibao metallurgy material limited company Address before: 474500 Xixia, Henan Province River Road, No. 412, No. Patentee before: Henan xibao metallurgy meterials group co.,ltd. |