CN113634726A - Free carbon-free covering slag for ultra-low carbon steel automobile plate - Google Patents
Free carbon-free covering slag for ultra-low carbon steel automobile plate Download PDFInfo
- Publication number
- CN113634726A CN113634726A CN202110853970.6A CN202110853970A CN113634726A CN 113634726 A CN113634726 A CN 113634726A CN 202110853970 A CN202110853970 A CN 202110853970A CN 113634726 A CN113634726 A CN 113634726A
- Authority
- CN
- China
- Prior art keywords
- free
- carbon
- slag
- steel
- ultra
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 114
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 26
- 238000002844 melting Methods 0.000 claims abstract description 47
- 230000008018 melting Effects 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims abstract description 4
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052788 barium Inorganic materials 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 3
- 239000011777 magnesium Substances 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000011651 chromium Substances 0.000 claims abstract 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract 2
- 239000010703 silicon Substances 0.000 claims abstract 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000010936 titanium Substances 0.000 claims abstract 2
- 230000004907 flux Effects 0.000 claims description 43
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 10
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 229910016287 MxOy Inorganic materials 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 58
- 239000010959 steel Substances 0.000 abstract description 58
- 238000005266 casting Methods 0.000 abstract description 55
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 50
- 229910052799 carbon Inorganic materials 0.000 abstract description 45
- 239000000843 powder Substances 0.000 abstract description 34
- 230000001681 protective effect Effects 0.000 abstract description 25
- 239000003575 carbonaceous material Substances 0.000 abstract description 23
- 230000002829 reductive effect Effects 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000006229 carbon black Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 241000519995 Stachys sylvatica Species 0.000 abstract description 5
- 230000036541 health Effects 0.000 abstract description 4
- 239000005028 tinplate Substances 0.000 abstract description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010309 melting process Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 13
- 239000002585 base Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000005245 sintering Methods 0.000 description 8
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000007785 strong electrolyte Substances 0.000 description 4
- 229910011255 B2O3 Inorganic materials 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052810 boron oxide Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- -1 B2O3Borax Chemical class 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 239000010456 wollastonite Substances 0.000 description 2
- 229910052882 wollastonite Inorganic materials 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 241001629697 Panicum turgidum Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- MOWNZPNSYMGTMD-UHFFFAOYSA-N oxidoboron Chemical class O=[B] MOWNZPNSYMGTMD-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Abstract
The invention relates to a free carbon-free covering slag for ultra-low carbon steel automobile plates, which comprises oxides of calcium, magnesium, strontium, barium, titanium, zirconium, chromium, manganese, aluminum, silicon, mixed or single rare earth and CaF2The melting temperature of the obtained composite oxide or mixture is 1240-1300 ℃. The temperature at which the slagging reaction starts to occur between the materials of the free carbon-free covering slag is high, so that the melting speed of the covering slag is controlled; the casting powder without free carbon does not generate a separation melting phenomenon in the melting process, and the surface quality of the casting blank is good; the slag of the protective slag without free carbon has low solubility in water and small pollution to the environment; the free carbon-free protective slag uses little or no framework materials such as carbon materials and the like, so that the cost is reduced, and the recarburization of the molten steel is prevented; the protective slag without free carbon does not contain Na2O, the tin plate steel can prevent the steel plate from generating white spots; the protective slag without free carbon can be applied to all steel grades, so that all protective slag is changed from black to white, and the damage of carbon black to human health is prevented.
Description
Technical Field
The invention relates to the field of crystallizer covering slag for continuous casting in steel smelting, in particular to free carbon-free covering slag for an ultra-low carbon steel automobile plate.
Background
During continuous casting, the covering slag is added into a crystallizer to contact with molten steel to form a molten layer, metallurgical reaction is carried out on the covering slag and the molten steel, the transmission of inclusions and component migration are generated, meanwhile, the action of the molten steel level and an unmelted layer is also caused due to the vibration of the crystallizer and the fluctuation of the molten steel level, and the characteristic of the covering slag directly influences the surface quality of a casting blank. When the ultra-low carbon steel is poured, a carbon-rich layer exists between a liquid slag layer and a sintering layer of the casting powder in the using process of a crystallizer, and is a main reason for the carburetion of the ultra-low carbon steel. The thickness and carbon content of the carbon-rich layer are related to the kind and content of the original carbonaceous material in the mold flux, and also carbonaceous particles suspended in the slag layer, which are contained in an amount of 0.1 to 0.3%, because direct contact with molten steel also carburetes the molten steel. The carbon content in the slag directly influences the change of carbon in the casting blank.
With the development of the steel industry, ultra-low carbon steel (the content of C is about 0.002%) represented by automobile panels and high-grade non-oriented silicon steel is produced in large quantities, a series of problems such as reduction of qualified rate of casting blanks and deterioration of surface quality are caused because carbon materials in casting powder are in contact with molten steel to easily cause carburization of the surfaces of the casting blanks and recarburization of molten steel in a crystallizer, and the control of the carbon content in the casting powder is beneficial to reduction of the recarburization value of the casting blanks.
Study on mineral raw material and physicochemical characteristics of mold flux
The covering slag generally consists of three parts, namely a base material part, a fluxing agent material and a melting speed regulator.
The composition of the covering slag base material is generally SiO2－CaO－Al2O3Since the lowest melting point of the ternary system is above 1300 ℃ (FIG. 1), the requirement of the mold flux between 950 ℃ and 1200 ℃ cannot be met, and therefore, a small amount of flux, such as alkali metal oxide (usually added with alkali metal carbonate, such as Li, etc.), such as alkali metal oxide, must be added to adjust the physical properties of the melting point, viscosity, surface tension, etc2CO3、Na2CO3、K2CO3) Fluorides, such as: CaF2、NaF、Na3AlF6Boron oxides, e.g. B2O3Borax, and the like. As a flux, there are several common points: first, its melting point is low except for CaF2Melting the casting powder in a crystallizer at a temperature of 1400 ℃ and generally below 1000 ℃ before the casting powder is melted to form liquid which is easy to react with the base material; secondly, the chemical activity is strong, alkali metal is the strongest alkaline compound, boron oxide is the strongest acidic compound (can be used as a raw material of the covering slag), and the boron oxide and the acidic compound can quickly react on the base material to form uniform covering slag; thirdly, the molten slag contains high-content electrolyte silicate and borate, so that the molten slag is relatively easy to dissolve in water, the solute concentration in the wastewater is high, the alkalinity is strong, the corrosion to equipment is serious, and the environmental pollution is large.
Because the reaction speed of the base material and the strong electrolyte fluxing agent is high, the melting speed of the covering slag is too high, and the function of the covering slag is also influenced.
The flux of the mold flux is generally an alkali metal oxide or salt, boric anhydride or salt. They are lithium carbonate, sodium carbonate, potassium carbonate, B2O3Borax, and some common glass and boron glass for waste utilization. These materials have a common point that they have a low melting temperature, melt at a low temperature, and easily chemically react with other raw materials (a fast solid-liquid reaction rate), so that a "skeleton material" is required in the mold flux to control the melting rate. Meanwhile, alkali metal salts are alkaline strong electrolytes relative to other metals; borates are also strong electric currents relative to silicates and aluminatesAnd (4) decomposing the materials. The strong electrolyte melts are also more aggressive towards the refractory material.
Therefore, a weak electrolyte material is used as a raw material of the covering slag to serve as a fluxing agent, and an alkali metal and a boron compound are not used as raw materials of the covering slag, so that a framework material is reduced or not used, and recarburization is reduced or avoided; the erosion of the water gap is reduced, and the service life of the water gap is prolonged; the solubility of the slag in cooling water is reduced, and the environmental pollution is reduced.
Referring to the knowledge of the refractory material, the sintering temperature of the refractory material is proportional to its melting point, the higher the sintering temperature. The ratio is called "Taman temperature", which is related to the lattice energy of the oxide, and the crystal with asymmetric lattice such as SiO2、Al2O3、TiO2、ZrO2、Cr2O3The crystal lattice energy of the alkali metal oxide is the lowest compared with the high-symmetry alkali metal and alkaline earth metal oxides, so that the lower the crystal lattice energy and the lower the melting point, the lower the sintering temperature is; the lower the sintering temperature, the lower the temperature at which chemical reactions with other substances occur. The alkali metal oxide in the mold flux has low lattice energy, low melting point and low sintering temperature, so that it is most easily reacted with other base materials and is selected as fluxing agent, B2O3As well as the same.
Therefore, the selection of the substances with high lattice energy and high melting point and the non-selection of the substances with low lattice energy and low melting point can improve the slagging reaction temperature of the casting powder and reduce the slagging reaction speed, namely, the melting speed of the casting powder is controlled when no framework material is contained.
The melting speed of the casting powder is an important parameter for evaluating the capability of supplying liquid slag by the casting powder and is a main means for controlling the thickness of a molten slag layer, the uniformity of a slag film and the slag consumption. Too slow a melting rate will not form a liquid slag layer of suitable thickness on the surface of the steel melt, which is detrimental to the air-insulating action of the slag and to the absorption of inclusions, and to lubrication due to the inability to form a sufficiently thick liquid slag film. If the melting speed is too high, a stable original slag layer cannot be kept on the molten steel surface, so that the molten slag layer is exposed, the heat loss is increased, the molten steel surface is easy to crust, and the defect of slag inclusion of steel billets can be caused. Too fast a melting rate may also cause non-uniformity of the liquid slag film, resulting in cracks and pits on the surface of the cast slab. Therefore, a proper multilayer structure can be formed on the molten steel surface at a proper melting speed, so that the molten steel is prevented from being reoxidized, the heat loss on the molten steel surface is reduced, and inclusions are absorbed as much as possible. Meanwhile, a slag film with enough thickness and stable and uniform thickness can be formed between the casting blank and the crystallizer only at a proper melting speed, so that good lubrication is ensured.
Generally, the melting rate of the mold flux is controlled by the carbonaceous material, and since carbon is not melted in the molten slag, particles of carbon are distributed between the base material and particles of the flux, between the base material and the droplets, and between the droplets to form a skeleton, the progress of the slag-forming reaction is prevented or delayed, and the polymerization of the molten slag droplets is delayed, thereby reducing the melting rate of the mold flux. The carbon in the crystallizer covering slag is added in the form of carbon black, graphite or coke powder, and the adding amount is 3-7%. In addition to controlling the melting rate, the carbonaceous material also functions to:
(1) heat insulation and preservation. With the increase of the carbonaceous materials, the heat insulation performance of the composite material is increased;
(2) controlling the melting speed, melting characteristics and melting model of the mold flux;
(3) affecting the spreading performance of the mold flux. With the increase of the carbonaceous materials, the spreading performance of the mold flux is improved;
(4) the function of the slag ring of the covering slag in the crystallizer is slowed down.
At present, there are many methods for reducing recarburization of the casting powder, mainly comprising: the activated carbon is adopted as the carbonaceous material, so that the thickness of a slag layer can be increased, the carbon content in a carbon-rich layer is reduced, and the recarburization of the ultra-low carbon steel is inhibited; the strong reducing substance is added to inhibit the oxidation speed of the carbon material of the covering slag in the using process, and the using amount of the carbon material is reduced while the using effect is ensured, so that the content of carbon in the carbon-rich layer is reduced, and the aim of reducing recarburization is fulfilled; adding carbonate, reducing the melting speed of the covering slag by utilizing the decomposition and heat absorption of the carbonate, and reducing the using amount of the carbonaceous material; replacing part of the carbonaceous material with carbide to reduce the addition of the carbonaceous material; replacing part of carbonaceous materials with organic matters; the melting speed of the covering slag is delayed by utilizing the phase change of the dicalcium silicate; the BN is used to completely replace carbonaceous materials, so that the aim of non-carburization of the casting blank can be achieved.
However, in the above method, as long as a carbonaceous material is adopted, a carbon-rich layer is formed, and the slag contains free carbonaceous particles, so that the molten steel is carburized, and only the carbonaceous material is completely replaced by BN, so that the purpose of non-carburization of a casting blank can be achieved, but the BN-containing casting powder has strong caking property when being used, so that the melting uniformity of the casting powder is influenced; bubbling and expansion are generated, and the operation is influenced; boron is added to the molten steel, so that the performance of the steel is influenced; BN is expensive, 30-50 ten thousand per ton. If 3% of BN is added into the mold flux, the cost of the mold flux is increased by about 12000 yuan/t, and the price of the ultra-low mold flux is about 6000 yuan/t at present.
Therefore, the above methods are not basically applied to the production of ultra low carbon steel for the above reasons, and currently, most of ultra low carbon steel mold flux uses an oxidizing substance (MnO) added to the mold flux2、Fe2O3) And oxidizing carbon in the carbon-rich layer and the slag layer to achieve the aim of reducing carburetion, wherein the carbon material content in the casting powder is 1.5-2.0%. In fact, the carbon increment of the covering slag of the method is between 5 and 10ppm, the production can reach about 15ppm when the production is unstable, in order to ensure that the carbon content of the billet reaches the standard, RH decarburization is generally enabled to reach below 10ppm, the RH time is prolonged, and the cost is increased.
The carbon-free mold flux produced by a certain japan company uses an organic carbonaceous material, and cannot be granulated, and after being carbonized at a high temperature, the fixed carbon content thereof is about 1%, and the carbonization cannot be avoided.
The carbon materials used in the covering slag mainly comprise carbon black and graphite, the specific surface area of the carbon black is very large, the particle size is between 10 and 100nm, the carbon black is very easy to enter pores when being contacted with skin, and the carbon black is not easy to clean; respiratory soot readily enters the alveoli and the world health organization lists soot in the "class 2B carcinogenic list".
The mold flux has one function: the method for absorbing the inclusions in the molten steel comprises the steps of rotating a corundum rod in the casting slag for a period of time, and then measuring the change of the diameter of the corundum rod. In fact, the purity of the existing high-grade steel and the steel is high, and the requirement on the casting powder is changedThe melting is carried out as long as the covering slag does not pollute the molten steel. On the other hand, the erosion of the refractory material by the mold flux is severe, so the material and the processing technology of the crystallizer submerged nozzle have strict requirements, namely the erosion of the nozzle by the mold flux is prevented. The common covering slag contains a large amount of strong electrolyte alkali metal oxide, and Na is generated with quartz2O·2SiO2And K2O·4SiO2The melting temperature is 782 ℃ and 769 ℃ respectively, and the quartz product is a strong erosion agent for quartz products and has strong erosion performance on submerged nozzles.
In the production of the tin plate, the defects related to the crystallizer casting powder are found, and the defects are called white spot defects because the defects are white oval under a scanning electron microscope. White spots due to the corrosion of NaOH on tin-plated substrates, NaOH is generated by hydrolysis reaction of Na-containing compounds in mold flux and cooling water, and therefore low sodium mold flux must be used for high-grade sheets.
In summary, the technical problems to be solved are:
1) the recarburization of the steel billet by the covering slag is reduced or avoided;
2) the erosion of the covering slag to the submerged nozzle is reduced;
3) the amount of slag dissolved in water is reduced, and the environmental pollution is reduced;
4) the adverse effect of the superfine carbonaceous material on human bodies in the production and use processes of the protective slag is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing the free carbon-free covering slag for the ultra-low carbon steel automobile plate so as to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a protecting slag without free carbon for the ultra-low-carbon steel plate of car is prepared from the oxides of Ca, Mg, Sr, Ba, Ti, Zr, Cr, Mn, Al, Si, and mixed or single rare-earth elements, and calcium fluoride through proportional mixing, and features that the smelting temp of said composite oxide or mixture is 1240-1300 deg.C.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the chemical components and percentages of the mold flux are as follows:
CaO：31％～36％，SiO2：35％～41％，Al2O3：4％～8％，MgO：6％～10％，MxOy：6％～10％，TiO：0.29％～3.24％，MnO：0.065％～6.45％，F：1.87％～7.09％，MxOyis an oxide of mixed or single rare earth.
Further, CaO: SiO22＝0.85～0.95。
Further, MxOyAt least comprising BaO.
Further, MxOyAt least also comprises RxOy，RxOyRepresenting various oxides in rare earths.
Further, the hemispherical point temperature of the mold flux is 1240 ℃ to 1300 ℃.
Further, the viscosity of the mold flux is 0.30pa.s to 0.50 pa.s.
Further, the solidification temperature of the mold flux is 1000 ℃ to 1080 ℃.
In CaO-SiO2-Al2O3In the ternary phase diagram, the covering slag selects a pseudo wollastonite region as a base material and CaO.SiO2Has a melting point of 1548 ℃ lower than that of CaO of 2570 ℃ and SiO2Melting point of 1728 deg.C when Al is added in the 'pseudo wollastonite' region2O3The melting temperature of the component is continuously reduced along with the increase of the content of the component, and the component reaches a ternary eutectic point (CAS) at about 25 percent2+C2AS + CS) lowest: 1265 deg.C, adding a small amount of CaF2The melting temperature can be within 1200 ℃, the melting temperature is close to the hemisphere point of the common casting powder, a proper amount of MnO, BaO and the like are added, the hemisphere point of the casting powder can be reduced to be below 1150 ℃, and the viscosity of the casting powder can be increased or reduced by network oxide (SiO)2、Al2O3) The amount of the control.
Compared with the prior art, the invention has the beneficial effects that:
1) the temperature at which the slagging reaction starts to occur between the materials of the free carbon-free covering slag is high, so that the melting speed of the covering slag is controlled;
2) the casting powder without free carbon can not generate the phenomenon of melting separation in the melting process, the surface quality of the casting blank is good, and the carburization of the casting blank is reduced by 60 percent;
3) the solubility of the slag of the protective slag without free carbon in water is low, the environmental pollution is small, 150g of protective slag is melted at 1300 ℃ and then poured into 1500ml of water, the pH value of the solution of the protective slag without free carbon is 7.89, the solution is closer to neutral, and the pH values of two types of current protective slag with ultra-low carbon steel are 8.44-8.49;
4) the free carbon-free protective slag uses little or no framework materials such as carbon materials and the like, so that the cost is reduced, and the recarburization of the molten steel is prevented;
5) the protective slag without free carbon does not contain Na2O, the tin plate steel can prevent the steel plate from generating white spots;
6) the protective slag without free carbon can be applied to all steel grades, so that all protective slag is changed from black to white, and the damage of carbon black to the health of a human body is prevented;
7) the free carbon-free casting powder provides a new casting powder concept, establishes a brand-new casting powder component system and a melting model, and achieves a brand-new use effect.
Drawings
FIG. 1 is a ternary phase diagram of a conventional mold flux;
FIG. 2 is a diagram showing the relationship between the C content in the mold powder and the amount of carbon added to the steel casting blank of the finished product;
FIG. 3 is a dual flow comparative test, wherein the left panel uses a free carbon free mold flux;
fig. 4 shows the case of dual-flow billet recarburization.
Detailed Description
Industrial testing
In the Wu-Steel-three-steelmaking tracking B1B1-2/B1A1-2Z test 5 furnaces, 9 steel samples in total are taken from the two furnaces, infrared test carbon content is adopted for verification, data analysis shows that the relationship between the C content in the crystallizer casting powder and the carbon increment from finished molten steel to casting blank is shown in figure 2, and the test shows that: the recarburization of the finished molten steel and the carbon content in the powder slag are in a linear growth relationship, so that the control of the carbon content in the powder slag is beneficial to the industrial test of the carbon-free protective slag in Baoshan steel works for controlling the carbon content in the finished steel products:
3 times of 6-furnace industrial tests are carried out in Bao steel works, and the chemical compositions and the main physical properties of 2 types of test slag are shown in Table 1. Steel grade: high oxygen coated aluminum steel, composition as shown in table 2, C: 20 ppm; the situation of the mold flux in the mold: no sintering and slag strips exist, the thickness of a slag layer is 10 mm-12 mm, the slag consumption is 0.45-0.50 kg/t steel, and the steel is equivalent to common slag; no recarburization condition exists, and the surface of the casting blank is free of defects. The hot rolling slag inclusion blocking condition of the two-flow casting blank in the last test is shown in table 3, and the carbon-free slag has good use effect.
TABLE 1 chemical composition and Main physical Properties of the test slags
| CaO | SiO2 | Al2O3 | MgO | F | MnO | | T.C | |
| Scheme | ||||||||
| 1 | 33.1 | 36.7 | 3.8 | 6.6 | 8.1 | 6.6 | / | 2.0 |
| |
34.0 | 37.8 | 3.8 | 6.6 | 7.0 | 5.7 | / | 2.0 |
| Range | ±4.0 | ±4.0 | ±1.5 | ±1.5 | ±1.5 | ±1.5 | ±0.8 |
| Melting point of | Viscosity, Pa.s | Freezing temperature of DEG C | Alkalinity (CaO/SiO2) | |
| |
1240 | 0.25 | 1030 | 0.90 |
| |
1260 | 0.40 | 1080 | 0.90 |
| Range | ±30 | ±0.06 | ±30 | ±0.06 |
TABLE 2 composition of aluminum-clad steel
| C | Si | Mn | P | S | Al | O |
| ＜0.003 | ＜0.01 | 0.05-0.2 | ＜0.015 | ＜0.008 | ＜0.005 | 0.02-0.04 |
TABLE 3 hot-rolled slag inclusion blockade ratio comparison
Industrial test of free carbon-free covering slag in wu steel limited steel works:
the industrial test is carried out in the Wu Steel works, the carbon-free covering slag is designed with three formulas, the chemical components and the main physical properties are shown in the table 4, each 100kg of the carbon-free covering slag has basically the same physical properties, the components are shown in the table 4, the carbon-free covering slag is continuously used, and the slag changing operation is not carried out. The test steel grades are shown in Table 5: auto panel M2A4-2, C: 10ppm, 300kg of protective slag is used for producing 600t of steel; the situation of the mold flux in the mold: no sintering and slag strips exist, the thickness of a slag layer is 15 mm-20 mm, the slag consumption is 0.5kg/t steel, and the steel is equivalent to common slag; no recarburization condition exists, and the surface of the casting blank is free of defects.
TABLE 4 chemical composition and main physical Properties of the test slag
TABLE 5 ultra-low carbon steel for automobile sheet M2A4-2 composition
In Table 4, F denotes the measured F content of calcium fluoride, and the calcium content of calcium fluoride is calculated in calcium oxide.
The test steel is ultra-low carbon steel for automobile plates, the influence of the casting powder on the recarburization of the billet is compared and examined, one casting time is performed, the first furnace is performed, the last furnace is performed, and each furnace is used for testing the non-carbon casting powder. The comparative stream normally used the West Bao ultra-low carbon steel BRK-D3, the physicochemical indexes of which are shown in Table 6 below.
TABLE 6 physicochemical table of BRK-D3 casting powder for Xibao ultra-low carbon steel
Vacuum RH steel samples and tundish steel samples are tested, and a sulfur-printed blank sample is reserved in a second block blank of each furnace: 150 × blank thickness, the same comparative casting times, the infrared carbon and acid-soluble aluminum content in the steel are analyzed and shown in table 7, the section 1/4 part of the casting blank is taken, the depth 1/2, 1/4 and 1/8 parts are taken, and the comparative condition of double-flow average recarburization is shown in fig. 4; compared with the data, the recarburization of the casting blank adopting the protective slag without free carbon is reduced by 0.00251 percent.
TABLE 7 analysis results of infrared carbon and acid-soluble aluminum of casting blanks
Has the advantages that:
1) the temperature at which the slagging reaction starts to occur between the materials of the free carbon-free covering slag is high, so that the melting speed of the covering slag is controlled;
2) the casting powder without free carbon can not generate the phenomenon of melting separation in the melting process, the surface quality of the casting blank is good, and the carburization of the casting blank is reduced by 60 percent;
3) the solubility of the slag of the protective slag without free carbon in water is low, the environmental pollution is small, 150g of protective slag is melted at 1300 ℃ and then poured into 1500ml of water, the pH value of the solution of the protective slag without free carbon is 7.89, the solution is closer to neutral, and the pH values of two types of current protective slag with ultra-low carbon steel are 8.44-8.49;
4) the free carbon-free protective slag uses little or no framework materials such as carbon materials and the like, so that the cost is reduced, and the recarburization of the molten steel is prevented;
5) the protective slag without free carbon does not contain Na2O, the tin plate steel can prevent the steel plate from generating white spots;
6) the protective slag without free carbon can be applied to all steel grades, so that all protective slag is changed from black to white, and the damage of carbon black to the health of a human body is prevented;
7) the free carbon-free casting powder provides a new casting powder concept, establishes a brand-new casting powder component system and a melting model, and achieves a brand-new use effect.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The free carbon-free covering slag for the ultra-low carbon steel automobile plate is characterized in that the covering slag comprises oxides of calcium, magnesium, strontium, barium, titanium, zirconium, chromium, manganese, aluminum, silicon, mixed or single rare earth and CaF2The melting temperature of the obtained composite oxide or mixture is 1240 ℃ to 1300℃。
2. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 1, wherein: the covering slag comprises the following chemical components in percentage by weight:
CaO：31％～36％，SiO2：35％～41％，Al2O3：4％～8％，MgO：6％～10％，MxOy：6％～10％，TiO：0.29％～3.24％，MnO：0.065％～6.45％，F：1.87％～7.09％，MxOyis an oxide of mixed or single rare earth.
3. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 2, wherein: CaO: SiO22＝0.85～0.95。
4. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 2, wherein: mxOyAt least comprising BaO.
5. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 4, wherein: mxOyAt least also comprises RxOy，RxOyRepresenting various oxides in rare earths.
6. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 2, wherein: the hemispherical point temperature of the mold flux is 1240 ℃ to 1300 ℃.
7. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 2, wherein: the viscosity of the mold flux is 0.30 pa.s-0.50 pa.s.
8. The free carbon-free mold flux for ultra-low carbon steel automotive sheets according to claim 2, wherein: the solidification temperature of the mold flux is 1000 ℃ to 1080 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853970.6A CN113634726A (en) | 2021-07-28 | 2021-07-28 | Free carbon-free covering slag for ultra-low carbon steel automobile plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853970.6A CN113634726A (en) | 2021-07-28 | 2021-07-28 | Free carbon-free covering slag for ultra-low carbon steel automobile plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113634726A true CN113634726A (en) | 2021-11-12 |
Family
ID=78418736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110853970.6A Pending CN113634726A (en) | 2021-07-28 | 2021-07-28 | Free carbon-free covering slag for ultra-low carbon steel automobile plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113634726A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03198953A (en) * | 1989-12-28 | 1991-08-30 | Harima Ceramic Co Ltd | Refractory for removing inclusion in molten steel |
| CN1082957A (en) * | 1992-07-18 | 1994-03-02 | 东北工学院 | With the wollastonite is the pouring in steel smelting covering slag of base-material |
| JPH09253808A (en) * | 1996-03-22 | 1997-09-30 | Shinagawa Refract Co Ltd | Mold powder for continuously casting steel |
| CN1485168A (en) * | 2002-09-29 | 2004-03-31 | 宝山钢铁股份有限公司 | Protective slag for continuous super low carbon steel casting |
| CN101954464A (en) * | 2010-10-19 | 2011-01-26 | 武汉钢铁(集团)公司 | Low-oxidizability continuous casting covering slag |
| CN103551537A (en) * | 2013-11-05 | 2014-02-05 | 河北省首钢迁安钢铁有限责任公司 | Ultra-low-carbon steel and low-carbon steel crystallizer mold flux for continuous casting of automobile sheet and preparation method thereof |
| CN110548842A (en) * | 2019-10-10 | 2019-12-10 | 万恩同 | Weak electrolyte protective slag |
| CN112157234A (en) * | 2020-08-31 | 2021-01-01 | 西峡县恒基冶材有限公司 | Ultra-low carbon crystallizer casting powder for automobile sheet continuous casting and preparation method thereof |
| CN113084105A (en) * | 2021-03-31 | 2021-07-09 | 重庆大学 | Low-reactivity casting powder containing yttrium oxide for high-aluminum steel |
-
2021
- 2021-07-28 CN CN202110853970.6A patent/CN113634726A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03198953A (en) * | 1989-12-28 | 1991-08-30 | Harima Ceramic Co Ltd | Refractory for removing inclusion in molten steel |
| CN1082957A (en) * | 1992-07-18 | 1994-03-02 | 东北工学院 | With the wollastonite is the pouring in steel smelting covering slag of base-material |
| JPH09253808A (en) * | 1996-03-22 | 1997-09-30 | Shinagawa Refract Co Ltd | Mold powder for continuously casting steel |
| CN1485168A (en) * | 2002-09-29 | 2004-03-31 | 宝山钢铁股份有限公司 | Protective slag for continuous super low carbon steel casting |
| CN101954464A (en) * | 2010-10-19 | 2011-01-26 | 武汉钢铁(集团)公司 | Low-oxidizability continuous casting covering slag |
| CN103551537A (en) * | 2013-11-05 | 2014-02-05 | 河北省首钢迁安钢铁有限责任公司 | Ultra-low-carbon steel and low-carbon steel crystallizer mold flux for continuous casting of automobile sheet and preparation method thereof |
| CN110548842A (en) * | 2019-10-10 | 2019-12-10 | 万恩同 | Weak electrolyte protective slag |
| CN112157234A (en) * | 2020-08-31 | 2021-01-01 | 西峡县恒基冶材有限公司 | Ultra-low carbon crystallizer casting powder for automobile sheet continuous casting and preparation method thereof |
| CN113084105A (en) * | 2021-03-31 | 2021-07-09 | 重庆大学 | Low-reactivity casting powder containing yttrium oxide for high-aluminum steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101612653B (en) | Mold powder for continuous casting of high aluminium-titanium-rare earth steel | |
| CN110315039B (en) | Application of fluorine-free covering slag in titanium-containing steel continuous casting | |
| WO2000005012A1 (en) | Molding powder for continuous casting of thin slab | |
| He et al. | Review of Mold Fluxes for Continuous Casting of High‐Alloy (Al, Mn, Ti) Steels | |
| WO2022127017A1 (en) | Special continuous casting crystallizer mold powder for sorbite stainless steel and application thereof | |
| CN111590039A (en) | Continuous casting covering slag for low-carbon high-aluminum steel and preparation method thereof | |
| CN111570740A (en) | Continuous casting covering slag for high-aluminum steel and preparation method thereof | |
| WO2014114123A1 (en) | Fluoride-free continuous casting mold flux for ultralow carbon steel | |
| JP2008264791A (en) | Mold powder for continuously casting steel and continuous casting method | |
| CN109454210B (en) | Double-layer tundish covering agent for ultrathin belt | |
| CN104128578A (en) | Environment-friendly casting powder of continuous casting crystallizer for high-aluminum peritectic steel | |
| CN110548842A (en) | Weak electrolyte protective slag | |
| CN113634726A (en) | Free carbon-free covering slag for ultra-low carbon steel automobile plate | |
| JP3142216B2 (en) | Mold powder for continuous casting of steel | |
| JP2006175472A (en) | Mold powder for continuous casting of steel, and continuous casting method of steel | |
| CN109702158B (en) | Casting powder for high-aluminum steel continuous casting and preparation method and application thereof | |
| JP2000071051A (en) | Powder for continuous casting of steel | |
| CN107282903A (en) | A kind of continuous super low carbon steel casting crystallizer protecting residue | |
| CN113025094A (en) | Antioxidant red mud doped paint for high-temperature steel billet | |
| CN114054698B (en) | Fluoride-free environment-friendly continuous casting mold flux for ultrahigh aluminum steel | |
| JP3119999B2 (en) | Mold powder for continuous casting | |
| JP2019038036A (en) | Method for producing steel and additive flux to container accommodating molten steel | |
| JP2000158105A (en) | Mold powder for continuous steel casting and continuous casting method | |
| RU2816961C1 (en) | Special powdered slag-forming mixture for crystallizer during continuous casting of stainless steel with sorbitol structure and application thereof | |
| JP2000051998A (en) | Method for continuously casting lead-containing steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211112 |