CN101348847A - Process method for refining and desulfurizing outside furnace - Google Patents
Process method for refining and desulfurizing outside furnace Download PDFInfo
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- CN101348847A CN101348847A CNA2008100124422A CN200810012442A CN101348847A CN 101348847 A CN101348847 A CN 101348847A CN A2008100124422 A CNA2008100124422 A CN A2008100124422A CN 200810012442 A CN200810012442 A CN 200810012442A CN 101348847 A CN101348847 A CN 101348847A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007670 refining Methods 0.000 title claims abstract description 28
- 230000003009 desulfurizing effect Effects 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 238000009850 CAS-OB (composition adjustment by sealed argon bubbling with oxygen blowing) Methods 0.000 claims abstract description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 60
- 229910052786 argon Inorganic materials 0.000 claims description 30
- 239000000292 calcium oxide Substances 0.000 claims description 25
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 25
- 235000012255 calcium oxide Nutrition 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 25
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 19
- 238000003672 processing method Methods 0.000 claims description 19
- 239000002893 slag Substances 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 16
- 238000005275 alloying Methods 0.000 claims description 13
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 235000012245 magnesium oxide Nutrition 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 11
- 235000012204 lemonade/lime carbonate Nutrition 0.000 claims description 11
- 239000001095 magnesium carbonate Substances 0.000 claims description 11
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 11
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 11
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 11
- 229960001708 magnesium carbonate Drugs 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 239000010962 carbon steel Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 235000006679 Mentha X verticillata Nutrition 0.000 claims description 4
- 235000002899 Mentha suaveolens Nutrition 0.000 claims description 4
- 235000001636 Mentha x rotundifolia Nutrition 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 13
- 230000023556 desulfurization Effects 0.000 abstract description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 8
- 238000003723 Smelting Methods 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 239000011593 sulfur Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract description 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 abstract 2
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 15
- 238000009472 formulation Methods 0.000 description 13
- 239000004411 aluminium Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 6
- 235000011941 Tilia x europaea Nutrition 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 239000004571 lime Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 6
- 239000005864 Sulphur Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 239000001506 calcium phosphate Substances 0.000 description 3
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 3
- 229940038472 dicalcium phosphate Drugs 0.000 description 3
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229960001866 silicon dioxide Drugs 0.000 description 2
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for external refining desulphurization, which is a preferred process method for desulphurization in the refining process of various microalloy steel or special steel. The method comprises the following steps: a. and (3) deoxidation: the molten steel is firstly deoxidized to alpha[O]Less than or equal to 0.0003 percent; b. feeding core-spun yarns: refining molten steel at an LF, RH, VD or CAS-OB station, and feeding a cored wire into the molten steel at the station by adopting a wire feeding process; c. continuous casting: the continuous casting adopts the whole-course protective casting. The application of the process proves that the desulfurization capacity is strong, the desulfurization rate is 60-90%, and the refining desulfurization of the molten steel can be realized until the sulfur content is lowAt 0.0010%. Greatly improves the purity of the molten steel and reduces the smelting cost.
Description
Technical field
The present invention relates to a kind of furnace outer refining process that is used for various micro-alloyed steels and special steel, particularly a kind of processing method that is used for outside-stove refining dephosphorization, it is the processing method of various micro-alloyed steels or special steel desulfurization in refining process first-selection.
Background technology
In general, except that indivedual steel grades such as free-cutting steel, sulphur is the harmful element in the steel, forms sulfide inclusion in steel, reduces the ductility and the toughness, particularly impelling strength of steel.When sulphur exists with the form of iron sulphide, can cause hot-shortly, simultaneously, the steel resistance to corrosion that sulfur-bearing is high reduces significantly, and is also unfavorable to the welding property of steel.Austenitic stainless steel sulphide stress corrosion crackle (SSCC) can occur through pitting attack, and its pitting attack source is just at non-metallic inclusion places such as manganese sulfide inclusions; It is to the maximum defective of oil pipeline harm that hydrogen is induced crackle (HIC), will produce the gap between the inclusion of manganese sulfide system and the steel, make it to become the responsive source that hydrogen is induced crackle, therefore, improve the purity of steel, it is most important to improving steel performance and reducing defective to reduce sulphur content.
A lot of desulphurization technological process are arranged at present, and the agent of winding-up lime desulfurization is a kind of comparatively common sulfur method in molten steel.When adopting lime to carry out the processing of desulfurization usually as sweetening agent, 2CaO+2S=2CaS+O
2, the oxygen of reaction generation combines with the silicon in the molten steel, produces silicon-dioxide (SiO
2).Along with being blown into lime, this silicon-dioxide has formed Dicalcium Phosphate (Feed Grade), and Dicalcium Phosphate (Feed Grade) formation solid layer is wrapped in lime powder surface.The result is unfavorable for the sweetening effectiveness of lime powder.Therefore the effective rate of utilization that improves the lime powder becomes the key that improves desulfuration efficiency.
Summary of the invention
The present invention be directed to above-mentioned problems of the prior art provide a kind of technology simple, be beneficial to operation, sweetening power is strong, effect is obvious, stablize, guarantee and improve the quality of refining steel, realize that liquid steel refining desulfurization to sulphur content is lower than 0.0010%, and reduce the processing method that is used for outside-stove refining dephosphorization of smelting cost.
In order to solve the problems of the technologies described above, the present invention is achieved in that the processing method that is used for outside-stove refining dephosphorization, comprises the steps: a, deoxidation: molten steel carries out deoxidation treatment earlier, reaches α
[O]≤ 0.0003%; B, feeding cored-wire: molten steel adopts line feeding technology at above-mentioned station cored-wire to be fed in the molten steel in LF, RH, VD or the refining of CAS-OB station; C, continuous casting: continuous casting adopts the whole process protection cast.
Described feeding cored-wire, after LF refinement and deoxidation alloying, feed, the line feeding process stops Argon and stirs, wire-feeding velocity is at 180～350m/min, feed quantity is at 50～800m/t, static 0.1～10min after the line feeding, and Argon is gently handled then, the flow of argon gas is 50～280Nl/min, and weak argon blowing time is 0.1～5min.
Described feeding cored-wire feeds after CAS-OB refinement and deoxidation alloying, and wire-feeding velocity is at 200～340m/min, and feed quantity is at 50～800m/t, and argon bottom-blowing stirs after the line feeding, and the argon gas stirring intensity is 0～0.004m
3/ (mint), argon blowing time is at 0.1～6min.
Described feeding cored-wire feeds after RH refinement and deoxidation alloying, and the line feeding position is in RH downtake one side, and wire-feeding velocity is at 180～350m/min, and feed quantity is at 50～800m/t.RH cycling time is 3～10min after the line feeding.
Described feeding cored-wire begins preceding feeding in the VD refining, and wire-feeding velocity is at 200～350m/min, and feed quantity is at 50～800m/t, VD pressurize 67Pa at least 15 minutes, or take out in advance and at least 25 minutes dwell times; During the VD vacuum-treat, argon pressure is 0.1MPa at least, argon flow amount 80～100Nl/min.
Described feeding cored-wire comprises also that directly the position of line feeding is the long nozzle below with its feeding tundish, and wire-feeding velocity is at 200～350m/min, and feed quantity is at 50～800m/t.
Described feeding cored-wire comprises also that directly wire-feeding velocity is at 200～350m/min with in its feeding crystallizer, and feed quantity is at 50～800m/t.
The core of described cored-wire be by following raw materials by weight through being prepared from:
Low melting point pre-melted slag cored-wire 1～70%, the mixture 1～60% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate, calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 0～98%, Calcium Fluoride (Fluorspan) 0～40%, binding agent 0～20%.
The core of described cored-wire be by following raw materials by weight through being prepared from:
Low melting point pre-melted slag pulvis 10～35%, the mixture 10～45% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate, calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 30～70%, Calcium Fluoride (Fluorspan) 5～30%, binding agent 5～15%.
Described cored-wire is to be crust with the thick mild-carbon steel strip of 2～5mm.
Described low melting point pre-melted slag pulvis by following raw materials by weight through being prepared from:
CaO 10%～70%, Al
2O
315%～50%, SiO
20～10%, MgO 0～10%, CaF
20～30%, its fusing point is at 1100 ℃～1550 ℃.
The granularity of described raw material is at 1nm～3.5mm, wherein calcium oxide, magnesian activity 〉=200ml.
Described binding agent is any one or a two or more mixture in clay, Portland cement, wilkinite, the water glass.
Processing method of the present invention compared with prior art, thereby because the present invention has added tiny CaO powder can fully react in the short time and avoid forming Dicalcium Phosphate (Feed Grade) on the CaO surface, improved the utilization ratio of active CaO powder.The CaCO of Jia Ruing simultaneously
3Powder is spontaneous discharges carbonic acid gas (CO
2), and in molten steel, cause abundant diffusion and the strong circulation that pre-melted slag drips, and strong circulation is to make the even essential condition of molten steel component.Therefore, the cored-wire that the present invention added, its formulation science is reasonable, and through using proof, sweetening power of the present invention is strong, and desulfurization degree is 60%～90%, can realize that liquid steel refining desulfurization to sulphur content is lower than 0.0010%.The purity that improves molten steel greatly reduces smelting cost.
Embodiment
Below in conjunction with specific embodiment the present invention is further elaborated, but protection scope of the present invention is not limited by specific embodiment, is as the criterion with claims.In addition, with under the prerequisite of technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
Embodiment 1
Converter tapping is transported to the refining of LF station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%, after deoxidation finishes, the feeding cored-wire; The line feeding process stops Argon and stirs; wire-feeding velocity is at 180～350m/min; feed quantity is at 50～800m/t; static 0.1～10min after the line feeding; Argon is gently handled then, and the flow of argon gas is 50～280Nl/min, and weak argon blowing time is that 0.1～5min takes out of; last machine cast, continuous casting adopts the whole process protection cast.
The preparation of cored-wire, at first the low melting point pre-melted slag is got CaO 40kg, Al by formulation ratio
2O
335kg, SiO
210kg, MgO 10kg, CaF
25kg puts into blender and carries out even batch mixing, fusing in the magnesia crucible, cooling then, and broken then roll and the air-flow micronizer grinds the powder that preparation becomes 1nm～3.5mm, its fusing point is standby at 1100～1550 ℃; Getting its particle diameter respectively by formulation ratio again is that low melting point fritting ground-slag 35kg, calcium fluoride powder 5kg, calcium oxide powder 55kg, the Paris white 5kg of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 80～200 ℃ of drying plants dries 10～22h and is pulvis.With thickness is the crust of the common low carbon steel band of 2mm～5mm as cored-wire, core is to pass through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, cored-wire speed is 8～30m/min, and cored-wire pulvis content is at 100～240g/m, be packaged into 1000～2000m/ volume, be beneficial to control add-on and adding speed in the use, the cross section of cored-wire is circular, and packing will be guaranteed good seal, prevent humidity, and in 20 days, use.
Embodiment 2
Converter tapping is transported to the refining of RH station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%; deoxidation finishes back feeding cored-wire; the line feeding position is in RH downtake one side; wire-feeding velocity is at 180～350m/min, and feed quantity is at 50～800m/t, and RH cycling time is 3～10min after the line feeding; vacuum breaker after the loop ends; take out of immediately, directly go up the machine cast, continuous casting adopts the whole process protection cast.
The preparation of cored-wire is at first by get CaO10kg, Al by formulation ratio
2O
350kg, SiO
25kg, MgO 5kg, CaF
230kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 1kg, the magnesium oxide 98kg, the magnesiumcarbonate 1kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 100～150 ℃ of drying plants dries 10h～22h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 2mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Embodiment 3
Converter tapping is transported to the refining of CAS-OB station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%, deoxidation finishes back feeding cored-wire, and wire-feeding velocity is at 200～340m/min, and feed quantity is at 50～800m/t, and argon bottom-blowing stirs after the line feeding, and the argon gas stirring intensity is 0～0.004m
3/ (mint), argon blowing time is taken out of at 0.1～6min, directly goes up the machine cast, and continuous casting adopts the whole process protection cast.
The preparation of cored-wire is at first got CaO70kg, Al by formulation ratio
2O
315kg, SiO
23kg, MgO2kg, CaF
210kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting mixture 30kg (both proportionings are not strict with), calcium oxide and magnesian mixture 10kg (both proportionings are not strict with), the wilkinite 15kg that its particle diameter is the low melting point pre-melted slag 45kg, lime carbonate and the magnesiumcarbonate that prepare of 1nm～3.5mm respectively by formulation ratio again goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 70～180 ℃ of drying plants dries 10h～20h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 2.5mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Embodiment 4
Converter tapping is transported to the refining of CAS-OB station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%, take out of, last machine cast, continuous casting adopts the whole process protection cast, directly cored-wire is fed in the crystallizer, and wire-feeding velocity is at 200～350m/min, and feed quantity is at 50～800m/t.
The preparation of cored-wire is at first got CaO50kg, Al by formulation ratio
2O
340kg, SiO
25kg, MgO5kg prepare the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 60kg, the Calcium Fluoride (Fluorspan) 10kg, lime carbonate 1kg, magnesium oxide 25kg, the clay 4kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 90～160 ℃ of drying plants dries 10h～15h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 5mm as cored-wire, core is to pass through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, cross section is square, and other is with embodiment 1.
Embodiment 5
Converter tapping is transported to the refining of LF station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%.Take out of, ladle is transported to the VD station, feeding cored-wire before the VD refining begins, wire-feeding velocity is at 200～350m/min, and feed quantity is at 50～800m/t, VD pressurize 67Pa at least 15 minutes, or take out in advance and at least 25 minutes dwell times; During the VD vacuum-treat, argon pressure is 0.1MPa at least, and argon flow amount 80～100Nl/min, continuous casting adopt the whole process protection cast.
The preparation of cored-wire is at first got CaO55kg, Al by formulation ratio
2O
325kg, CaF
220kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 3kg, the Calcium Fluoride (Fluorspan) 2kg, lime carbonate 10kg, the magnesium oxide 85kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 80～180 ℃ of drying plants dries 10h～16h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 4mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Embodiment 6
Converter tapping is transported to the refining of LF station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%, take out of, last machine cast, continuous casting adopts the whole process protection cast.Directly cored-wire is fed tundish in casting process, the position of dusting is the long nozzle below, and wire-feeding velocity is at 200～340m/min, and feed quantity is at 50～800m/t.
The preparation of cored-wire is at first got CaO35kg, Al by formulation ratio
2O
345kg, MgO5kg, CaF
215kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 12kg, the Calcium Fluoride (Fluorspan) 18kg, magnesiumcarbonate 45kg, calcium oxide 15kg, clay 6kg, the water glass 4kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 90～170 ℃ of drying plants dries 10h～20h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 3mm as cored-wire, core is to pass through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, cross section is square, and other is with embodiment 1.
Be that cored-wire of the present invention is removed the application in the fine foreign matter below in the external refining process of various micro-alloyed steels and special steel.
Application Example
After ladle is transported to the CAS-OB station, the thermometric sampling, deoxidation alloying, employing adds the aluminium mode and carries out deoxidation treatment, reaches α
[O]≤ 0.0003%, deoxidation finishes back feeding cored-wire, and wire-feeding velocity is at 200～340m/min, and feed quantity is at 50～800m/t, and argon bottom-blowing stirs after the line feeding, and the argon gas stirring intensity is 0～0.004m
3/ (mint), argon blowing time is at 0.1～6min, and last machine is poured into a mould, and continuous casting adopts the whole process protection cast.
Table 1
| S | |
| Before the desulfurization | 0.0070％ |
| After the desulfurization | 0.0012％ |
| Continuous casting steel billet | 0.0012％ |
| Desulfurization degree | 82.86％ |
Claims (13)
1, the processing method that is used for outside-stove refining dephosphorization is characterized in that comprising the steps:
A, deoxidation: molten steel carries out deoxidation treatment earlier, reaches α
[O]≤ 0.0003%;
B, feeding cored-wire: molten steel adopts line feeding technology at above-mentioned station cored-wire to be fed in the molten steel in LF, RH, VD or the refining of CAS-OB station;
C, continuous casting: continuous casting adopts the whole process protection cast.
2, processing method according to claim 1, it is characterized in that the described feeding cored-wire of step b, after LF refinement and deoxidation alloying, feed, the line feeding process stops Argon and stirs, and wire-feeding velocity is at 180～350m/min, and feed quantity is at 50～800m/t, static 0.1～10min after the line feeding, Argon is gently handled then, and the flow of argon gas is 50～280Nl/min, and weak argon blowing time is 0.1～5min.
3, processing method according to claim 1 is characterized in that the described feeding cored-wire of step b, feeds after CAS-OB refinement and deoxidation alloying, wire-feeding velocity is at 200～340m/min, feed quantity is at 50～800m/t, and argon bottom-blowing stirs after the line feeding, and the argon gas stirring intensity is 0～0.004m
3/ (mint), argon blowing time is at 0.1～6min.
4, processing method according to claim 1 is characterized in that the described feeding cored-wire of step b, feeds after RH refinement and deoxidation alloying, and the line feeding position is in RH downtake one side, and wire-feeding velocity is at 180～350m/min, and feed quantity is at 50～800m/t.RH cycling time is 3～10min after the line feeding.
5, processing method according to claim 1 is characterized in that the described feeding cored-wire of step b, begins preceding feeding in the VD refining, wire-feeding velocity is at 200～350m/min, feed quantity is at 50～800m/t, VD pressurize 67Pa at least 15 minutes, or take out in advance and at least 25 minutes dwell times; During the VD vacuum-treat, argon pressure is 0.1MPa at least, argon flow amount 80～100Nl/min.
6, processing method according to claim 1 is characterized in that the described feeding cored-wire of step b comprises also that directly the position of line feeding is the long nozzle below with its feeding tundish, and wire-feeding velocity is at 200～350m/min, and feed quantity is at 50～800m/t.
7, processing method according to claim 1 is characterized in that the described feeding cored-wire of step b comprises also that directly wire-feeding velocity is at 200～350m/min with in its feeding crystallizer, and feed quantity is at 50～800m/t.
8, processing method according to claim 1, the core that it is characterized in that described cored-wire be by following raw materials by weight through being prepared from:
Low melting point pre-melted slag pulvis 1～70%
The mixture 1～60% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate
Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 10～98%
Calcium Fluoride (Fluorspan) 0～40%
Binding agent 0～20%
9, processing method according to claim 1, the core that it is characterized in that described cored-wire be by following raw materials by weight through being prepared from:
Low melting point pre-melted slag pulvis 10～35%
The mixture 10～45% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate
Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 30～70%
Calcium Fluoride (Fluorspan) 5～30%
Binding agent 5～15%
10, processing method according to claim 1 is characterized in that described cored-wire is is crust with the thick mild-carbon steel strip of 2～5mm.
11, according to Claim 8 or 9 described processing methodes, it is characterized in that described low melting point pre-melted slag pulvis by following raw materials by weight through being prepared from:
CaO 10%～70%, Al
2O
315%～50%, SiO
20～10%, MgO 0～10%, CaF
20～30%, its fusing point is at 1100 ℃～1550 ℃.
12, according to Claim 8 or 9 described processing methodes, the granularity that it is characterized in that described raw material is at 1nm～3.5mm, wherein calcium oxide, magnesian activity 〉=200ml.
13, according to Claim 8 or 9 described processing methodes, it is characterized in that described binding agent is any one or a two or more mixture in clay, Portland cement, wilkinite, the water glass.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871035A (en) * | 2010-05-31 | 2010-10-27 | 北京科技大学 | Refining device and vacuum refining process for use in non-oriented silicon steel production |
| CN102527965A (en) * | 2010-12-11 | 2012-07-04 | 鞍钢股份有限公司 | Method for desulfurizing in continuous casting process and tundish wire feeding device thereof |
| CN111996335A (en) * | 2020-09-10 | 2020-11-27 | 河北工程大学 | Core-spun yarn core powder composition for high-aluminum steel production and processing method |
| CN113637887A (en) * | 2021-07-29 | 2021-11-12 | 南京钢铁股份有限公司 | Preparation method of low-carbon low-oxygen-level sulfur free-cutting steel |
-
2008
- 2008-07-23 CN CN200810012442A patent/CN101348847B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871035A (en) * | 2010-05-31 | 2010-10-27 | 北京科技大学 | Refining device and vacuum refining process for use in non-oriented silicon steel production |
| CN102527965A (en) * | 2010-12-11 | 2012-07-04 | 鞍钢股份有限公司 | Method for desulfurizing in continuous casting process and tundish wire feeding device thereof |
| CN111996335A (en) * | 2020-09-10 | 2020-11-27 | 河北工程大学 | Core-spun yarn core powder composition for high-aluminum steel production and processing method |
| CN113637887A (en) * | 2021-07-29 | 2021-11-12 | 南京钢铁股份有限公司 | Preparation method of low-carbon low-oxygen-level sulfur free-cutting steel |
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