CN104831033A - Molten iron double-roll cast rolling and solid decarburization and steel-making method - Google Patents
Molten iron double-roll cast rolling and solid decarburization and steel-making method Download PDFInfo
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- CN104831033A CN104831033A CN201510294535.9A CN201510294535A CN104831033A CN 104831033 A CN104831033 A CN 104831033A CN 201510294535 A CN201510294535 A CN 201510294535A CN 104831033 A CN104831033 A CN 104831033A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000007787 solid Substances 0.000 title claims abstract description 81
- 238000009628 steelmaking Methods 0.000 title claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 61
- 238000005261 decarburization Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005096 rolling process Methods 0.000 title claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000005262 decarbonization Methods 0.000 claims description 84
- 238000007789 sealing Methods 0.000 claims description 19
- 238000005266 casting Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 4
- 229910000954 Medium-carbon steel Inorganic materials 0.000 claims description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 27
- 238000003723 Smelting Methods 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 238000009749 continuous casting Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005098 hot rolling Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910017112 Fe—C Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 206010058490 Hyperoxia Diseases 0.000 description 1
- 229910001296 Malleable iron Inorganic materials 0.000 description 1
- 229910000700 SAE 1075 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000000222 hyperoxic effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A molten iron double-roll cast rolling and solid decarburization and steel-making method comprises the following steps of performing necessary molten iron pretreatment on molten iron which is produced by a blast furnace or smelting reduction; pouring the molten iron to a double-roll cast rolling machine through a molten iron tundish; performing cast rolling on the molten iron by using the molten iron double-roll cast rolling machine to obtain thin stocks; feeding the thin stocks to a solid decarburization and steel-making room; reacting under the atmosphere pressure and the decarburization temperature in the solid decarburization and steel-making room; removing carbon in thin plate straps on supporting rolls in a gas-solid reaction mode; and discharging the thin plate straps out of the solid decarburization and steel-making room. In the decarburization process, high-strength oxygen blowing and iron alloy deoxidation link is omitted, and impurities in steel and gas are prevented from being generated; procedure points such as converter decarburization, external refining, slab continuous casting and heating and hot rolling in the existing technological process are omitted, and the existing steel-making technological process is changed thoroughly; and a thin stock conveying mode is a hot-loading and hot-conveying mode, the decarburization temperature in the solid decarburization steel-making room is adjusted, finished steel is discharged from the solid decarburization and steel-making room, and the molten iron double-roll cast rolling and solid decarburization and steel-making method is particularly suitable for improvement of the existing steelworks technology.
Description
Technical field
The invention belongs to the manufacture Application Areas of carbon steel strip, the novel method of particularly a kind of molten iron double-roller rolling simply and efficiently-solid state decarbonization steel-making.
Background technology
It is redox-reduction (deoxidation) process experienced in the process of steel repeatedly that high furnace superintendent flow process is smelted by iron ore, and blast furnace produces high-carbon molten iron and becomes a useful person after hot metal pretreatment-converter steelmaking-external refining-continuous casting-rolling.Converter Oxigen Blowing decarburization, because in molten steel, the solubleness of oxygen is high, hyperoxia gesture molten steel need through alloy deoxidation and argon gas stir and remove continuous casting after part inclusion and gas, procedure-node is many and complicated, and smelting cost is high.Nonetheless, remain a certain amount of inclusion and gas in steel and steel quality is impacted.
Double-roller rolling can produce 0.5 ~ 3mm cast iron board band, and produces the industrialization of below 0.5%C steel band, solves iron and steel strip production problem.
Decarburization steel-smelting technology depends primarily on decarbonization rate and the decarburized layer deepness of the solid-state Fe-C alloy of high-carbon.Nagasaki for a long time more etc. has been carried out white pig iron gas decarbonization and has been produced the experimental study that white heart malleable cast iron.At 750-1100 DEG C of temperature range, different CO-CO
2-H
2-H
2result under O atmospheric condition shows, Decarburized layer obtained in various atmospheres is homogeneous ferrite, and case carbon is all in alpha ferrite solution range, and the cementite in white pig iron is because of H
2existence and be difficult to greying, temperature raise be conducive to accelerate decarburization.
The experimental study of the decarburization aspect of steel focuses mostly in the decarburization of electrical steel, because industrial production oriented silicon steel often needs decarburizing annealing process to control carbon content and weave construction.This type of research all concentrates on high silicon Ultra-low carbon scope, because of its high silicon content, causes its result of study can not be applied to straight carbon steel at steel carbon rejection process because silicon oxide film hinders diffusion.R.J. the experimental study such as Fruehan with Al for the TRIP steel (C 0.14%, Mn 1.8%, Si 0.6%, Al 1%) of Si, Mn at H
2o-H
2(P under atmosphere different condition
h2O/ P
h20.01-0.32) the oxidation of 843 DEG C of annealing processes and decarburization relation.In the experimental studies such as A.R.Marder 650-930 DEG C of temperature range, carbon content 0.026-0.8% steel is at humidification H
2-N
2decarburization shape under atmosphere is.
Decarburization research about high carbon steel also appears in the newspapers and leads, but its carbon content is all lower than A
cm.J.D.Verhoeven have studied hypereutectoid Fe-C alloy (carbon containing 1.6%) lower than dissolution degree temperature (A
cM) and higher than the decarburization at perlite temperature, result shows, Decarburized layer is made up of ferrite lamellae and austenite case, and the latter becomes perlite after the cooling period.R.D. Cioffi is in 800 ~ 950 DEG C of air atmospheres, has carried out contrast experiment to 1075 steel (C 0.73%, Mn 0.73%, Cr 0.19%) and 440A stainless steel (C 0.66%, Cr 13.05%), and metallurgical analysis combines with microhardness mensuration decarburized layer deepness.
From above-mentioned analysis, the method of being made steel by solid state decarbonization after molten iron double-roller rolling is at present considerably less, the research in the Fe-C alloy decarburization in high-carbon territory and Ultra-low carbon territory and the research also rarely seen report under higher Heating temperature (1000 DEG C ~ 1250 DEG C).
Summary of the invention
The object of the invention is to the defect for prior art, provide the novel method of a kind of molten iron double-roller rolling-solid state decarbonization steel-making, the present invention is applicable to the improvement of existing Steel Plant technique.
The present invention is by the following technical solutions:
The method of a kind of molten iron double-roller rolling-solid state decarbonization steel-making, the equipment that the method uses comprises molten iron tundish, twin-roll cast-rolling mill, the equipment that described method uses also comprises solid state decarbonization steel-making room, this solid state decarbonization steel-making room is high-temperature atmosphere sealing chamber, high-temperature atmosphere sealing chamber is provided with supporting roll, the concrete grammar step of solid state decarbonization steel-making is: the molten iron produced by blast furnace or melting and reducing, after the hot metal pretreatment of necessity, by molten iron tundish, water in molten iron twin-roll cast-rolling mill, directly become thin stock by the casting of molten iron twin-roll cast-rolling mill, then thin stock is directly delivered to solid state decarbonization steel-making indoor, be 0.1MPa ~ 1.0MPa at solid state decarbonization steel-making internal ambience pressure, decarburization temperature is 900 DEG C ~ 1250 DEG C, reaction times is 5min ~ 40min, the carbon in the sheet band on supporting roll is removed by gas-solid reaction form, send solid state decarbonization steel-making room.
Further, described solid state decarbonization steel-making room comprises heating and heat-insulating device, pressure sealing entrance, pressure sealing outlet, decarbonization gas entrance, decarbonization gas outlet; Be a rectangular parallelepiped or right cylinder, one end is provided with pressure sealing entrance, the other end is provided with pressure sealing outlet, decarbonization gas outlet is provided with above rectangular parallelepiped or right cylinder, below is provided with decarbonization gas entrance, solid state decarbonization steel-making indoor are filled with decarburization gas, and supporting roll through solid state decarbonization steel-making room is until outdoor.
Further, the hot metal pretreatment of described necessity, comprises one or more treatment steps of the desiliconization to molten iron, desulfurization, dephosphorization.
Further, described molten iron twin-roll cast-rolling mill casting becomes thin stock nip rolls to clamp, and is supported send into solid state decarbonization steel-making indoor by supporting roll.
Further, the casting of molten iron twin-roll cast-rolling mill becomes the thickness of thin stock to be 0.1mm ~ 3.0mm.
Further, described molten iron twin-roll cast-rolling mill casting becomes thin stock transfer ways to be hot-loading and hot-conveying, makes steel indoor adjustment decarburization temperature at solid state decarbonization.
Further, solid state decarbonization makes steel the decarburization gas of indoor filling is water vapor or CO
2or the mixture of the two.
Further, the pressure ratio of solid state decarbonization steel-making indoor gas comprises P
h2O/ P
h2ratio or P
cO2/ P
cOratio, its ratio is greater than 20 respectively.
Further, after the indoor level reached required by medium and high carbon steel, soft steel or ultra low-carbon steel of solid state decarbonization steel-making, send solid state decarbonization steel-making room.
Compared with prior art, its significant effect is in the present invention:
(1) because carbon rejection process does not have high strength oxygen blast and iron alloy deoxidation link, the generation of steel inclusion and gas can be avoided;
(2) eliminate the converter decarburization in existing technical process, external refining, sheet billet continuous casting, add reheat heat and the procedure-node such as to roll, thoroughly change existing process for making flow process;
(3) investment of molten iron-steelmaking process, energy consumption and CO
2discharge significantly reduces.
(4) solid state decarbonization of the present invention steel-making room, thin stock transfer ways is hot-loading and hot-conveying, makes steel indoor adjustment decarburization temperature at solid state decarbonization, and Finished Steel is made steel room by solid state decarbonization and exported, and is particularly useful for the improvement of existing Steel Plant technique.
Accompanying drawing explanation
Fig. 1 is molten iron double-roller rolling-solid state decarbonization process for making figure.
Fig. 2, Fig. 3 are experimental sample section S EM photo figure, and wherein (a) sample (1mm is thick) amplifies 200 times, and (b) sample (1mm is thick) amplifies 2000 times
Mark in Fig. 1,1. molten iron tundish; 2. high temperature liquid iron; 3. twin-roll cast-rolling mill; 4. nip rolls; 5. thin stock; 6. supporting roll; 7. pressure sealing entrance; 8. decarbonization gas outlet; 9. solid state decarbonization steel-making room; 10. decarburization gas; 11. sheet bands; 12. pressure sealing outlets; 13. decarbonization gas entrances.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The invention discloses the method for a kind of molten iron double-roller rolling-solid state decarbonization steel-making, the device that the method uses and step are shown in accompanying drawing 1, and described device is made up of molten iron tundish 1, twin-roll cast-rolling mill 3, solid state decarbonization steel-making room 9 etc.Molten iron tundish 1 is positioned at the top of twin-roll cast-rolling mill 3, twin-roll cast-rolling mill 3 correspondence arranges multiple nip rolls 4, and nip rolls 4 is connected with supporting roll 6, and supporting roll 6 passes from solid state decarbonization steel-making room 9, outside 9 to solid state decarbonization steel-making room 9, through solid state decarbonization steel-making room, be connected with e Foerderanlage.See Fig. 1, solid state decarbonization steel-making room 9 is high-temperature atmosphere sealing chambers, comprise heating and heat-insulating device, pressure sealing entrance 7, pressure sealing outlet 12, decarbonization gas entrance 13, decarbonization gas outlet 8 be a right cylinder, his one end is provided with pressure sealing entrance 7, the other end is provided with pressure sealing outlet 12, is provided with decarbonization gas outlet 8, is provided with decarbonization gas entrance 13 below right cylinder above right cylinder, solid state decarbonization steel-making is filled with decarburization gas in room 9, and the decarburization gas of the present embodiment is water vapor or CO
2or the mixture of the two.The pressure ratio of solid state decarbonization steel-making indoor gas comprises P
h2O/ P
h2ratio or P
cO2/ P
cOratio, its ratio is greater than 20 respectively.The method steps of solid state decarbonization steel-making is:
The molten iron produced by blast furnace or melting and reducing, after one or more process pre-treatment step of the desiliconization to molten iron, desulfurization, dephosphorization, by molten iron tundish, water in molten iron twin-roll cast-rolling mill, directly thickness is become to be the thin stock 5 of 0.1mm ~ 3.0mm by the casting of molten iron twin-roll cast-rolling mill, thin stock 5, under the clamping of nip rolls 4, adopts the transfer ways of hot-loading and hot-conveying to send in solid state decarbonization steel-making room 9, adjustment decarburization temperature in solid state decarbonization steel-making room 9.In solid state decarbonization steel-making room 9, atmosphere pressures is 0.1MPa ~ 1.0MPa, decarburization temperature is 900 DEG C ~ 1250 DEG C, reaction times is 5min ~ 40min, the carbon in the sheet band on supporting roll is removed by gas-solid reaction form, according to product demand, after the indoor level reached required by medium and high carbon steel, soft steel or ultra low-carbon steel of solid state decarbonization steel-making, send solid state decarbonization steel-making room.Send solid state decarbonization steel-making room 9.
Specific embodiment
By the high temperature liquid iron 2 of blast fumance, carbon content is 3.5%, and after desulfurizing iron and dephosphorizing pretreatment, water in double-roller rolling equipment by molten iron tundish 1, directly become thin stock 5 by twin-roll cast-rolling mill 3 casting, its thickness is 2.5mm; Then thin stock 5 direct hot charging heat delivered in solid state decarbonization steel-making room 9, the decarburization temperature of adjustment solid state decarbonization steel-making room 9 is 1200 DEG C, gas ratio P
h2O/ P
h2value is 30, under remaining on the atmosphere pressures of 0.15MPa, decarburization time is 30min, the carbon on supporting roll 6 in thin stock 5 is removed by gas-solid reaction form, decarburization to carbon content is 0.35%, after reaching the level required by medium carbon steel, send solid state decarbonization steel-making room 9, transport with transport trolley or other e Foerderanlage.
EXPERIMENTAL EXAMPLE
In order to the present invention is described, according to setting up pilot system according to above-mentioned specific embodiment, carried out high-carbon iron strip solid state decarbonization steel-making experiment, experiment adopts 40%Ar-8%H
2-H
2o decarburization mixed gas, at 1050 DEG C, is incubated 20 minutes, the high-carbon strip decarburization of carbon content 1.7% to carbon containing 0.5%.Experimental result fully shows that the present invention is feasible:
Iron and steel stock presses component requirements, is made into by high-purity electrolytic iron and graphite, HIGH-PURITY SILICON and electrolytic manganese, and carbon content is 4.06%, revolves by high vacuum arc melting all-in-one of quenching, melting one hour at 1650 DEG C, gets rid of into 1mm thickness iron strip; On the airtight horizontal tube resistance furnace of the temperature controllable having installed water-bath and temperature regulating device, adopt the decarburization mixed gas of 300ml/min gas flow, at 1140 DEG C, be incubated 25 minutes, the high-carbon strip decarburization of carbon content 4.06% to carbon containing 0.41%.Fig. 2-3 a.b is respectively the SEM photo of specimen cross section.Can find out that from Fig. 2, Fig. 3 the upper and lower both sides of strip have defined a thick layer of ferritic structure layer, and the inner ferritic structure proportion of base is large, the ferritic structure that a lot of area is larger has been there is in the close very large panel region of ferrite lamellae, organize the closer to surface ferrite more, illustrate in 1mm place decarburization effect fine.
Above-described embodiment only have expressed one embodiment of the present invention, but therefore can not be interpreted as limitation of the scope of the invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (9)
1. the method for molten iron double-roller rolling-solid state decarbonization steel-making, the equipment that the method uses comprises molten iron tundish, twin-roll cast-rolling mill, it is characterized in that, the equipment that described method uses also comprises solid state decarbonization steel-making room, this solid state decarbonization steel-making room is high-temperature atmosphere sealing chamber, high-temperature atmosphere sealing chamber is provided with supporting roll, the concrete grammar step of solid state decarbonization steel-making is: the molten iron produced by blast furnace or melting and reducing, after the hot metal pretreatment of necessity, by molten iron tundish, water in molten iron twin-roll cast-rolling mill, directly become thin stock by the casting of molten iron twin-roll cast-rolling mill, then thin stock is directly delivered to solid state decarbonization steel-making indoor, be 0.1MPa ~ 1.0MPa at solid state decarbonization steel-making internal ambience pressure, decarburization temperature is 900 DEG C ~ 1250 DEG C, reaction times is 5min ~ 40min, the carbon in the sheet band on supporting roll is removed by gas-solid reaction form, send solid state decarbonization steel-making room.
2. the method for molten iron double-roller rolling according to claim 1-solid state decarbonization steel-making, is characterized in that, described solid state decarbonization steel-making room comprises heating and heat-insulating device, pressure sealing entrance, pressure sealing outlet, decarbonization gas entrance, decarbonization gas outlet; Be a rectangular parallelepiped or right cylinder, one end is provided with pressure sealing entrance, the other end is provided with pressure sealing outlet, decarbonization gas outlet is provided with above rectangular parallelepiped or right cylinder, below is provided with decarbonization gas entrance, solid state decarbonization steel-making indoor are filled with decarburization gas, and supporting roll through solid state decarbonization steel-making room is until outdoor.
3. the method for molten iron double-roller rolling according to claim 1-solid state decarbonization steel-making, is characterized in that, the hot metal pretreatment of described necessity, comprises one or more treatment steps of the desiliconization to molten iron, desulfurization, dephosphorization.
4. the method for molten iron double-roller rolling according to claim 1-solid state decarbonization steel-making, it is characterized in that, described molten iron twin-roll cast-rolling mill casting becomes thin stock nip rolls to clamp, and is supported send into solid state decarbonization steel-making indoor by supporting roll.
5. the method for molten iron double-roller rolling according to claim 4-solid state decarbonization steel-making, it is characterized in that, the casting of molten iron twin-roll cast-rolling mill becomes the thickness of thin stock to be 0.1mm ~ 3.0mm.
6. the method for the molten iron double-roller rolling according to claim 1 or 4-solid state decarbonization steel-making, it is characterized in that, described molten iron twin-roll cast-rolling mill casting becomes thin stock transfer ways to be hot-loading and hot-conveying, makes steel indoor adjustment decarburization temperature at solid state decarbonization.
7. the method for molten iron double-roller rolling according to claim 1-solid state decarbonization steel-making, is characterized in that, it is water vapor or CO that solid state decarbonization makes steel the decarburization gas of indoor filling
2or the mixture of the two.
8. the method for molten iron double-roller rolling-solid state decarbonization steel-making according to claim 1, is characterized in that, the pressure ratio of solid state decarbonization steel-making indoor gas comprises P
h2O/ P
h2ratio or P
cO2/ P
cOratio, its ratio is greater than 20 respectively.
9. the method for molten iron double-roller rolling-solid state decarbonization steel-making according to claim 1, is characterized in that, after the indoor level reached required by medium and high carbon steel, soft steel or ultra low-carbon steel of solid state decarbonization steel-making, sends solid state decarbonization steel-making room.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097884A (en) * | 2019-12-31 | 2020-05-05 | 华北理工大学 | Preparation method of silicon steel thin strip |
| CN112322866A (en) * | 2020-11-05 | 2021-02-05 | 华北理工大学 | Process and device for producing medium-high manganese steel plate strip |
| CN112536424A (en) * | 2020-11-13 | 2021-03-23 | 华北理工大学 | Device for rapidly decarbonizing and steelmaking by adjusting gas flow through segmented temperature control and using method |
| CN113403458A (en) * | 2021-06-23 | 2021-09-17 | 唐山鑫业科技有限公司 | White heart malleable cast iron production process |
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2015
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| JPS63157750A (en) * | 1986-12-22 | 1988-06-30 | Hitachi Ltd | Strip production apparatus |
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