CN107790649B - A kind of method that molten iron is directly casting continuously to form steel billet - Google Patents
A kind of method that molten iron is directly casting continuously to form steel billet Download PDFInfo
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- CN107790649B CN107790649B CN201610785836.6A CN201610785836A CN107790649B CN 107790649 B CN107790649 B CN 107790649B CN 201610785836 A CN201610785836 A CN 201610785836A CN 107790649 B CN107790649 B CN 107790649B
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- Prior art keywords
- molten iron
- iron
- steel
- molten
- oxygen
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of method that molten iron is directly casting continuously to form steel billet, process flows are as follows: desulfurizing iron pretreatment-primary slagging-off-closing iron runner oxygen gun blowing-addition dephosphorization slag material-secondary slagging-off-steel structure-tundish-crystallizer in blast furnace casting-ditch；The present invention uses continuous production mode, steel-making each process is integrated, it realizes the quick processing of molten iron and is directly casting continuously to form base, blast furnace is saved to Molten Iron Transportation process between converter, a series of and auxiliary facilities needed for converter smelting, process has been simplified significantly, is saved production time and cost, is improved production efficiency.
Description
Technical field
The present invention relates to steelmaking technical fields more particularly to a kind of molten iron without converter or electric furnace, is directly casting continuously to form steel billet
Method.
Background technique
The big project of the two of modern steel industrial development is first is that production ultra-clean steel, second is that significantly simplification of flowsheet, to
Specialization, serialization, automation and high speed direction are developed, and only make the entire production process from ore to steel billet continuous
Change, is likely to reach the requirement of high speed.
There are no the reports of the blast-melted method for making steel that steel billet is directly casting continuously to form without converter or electric furnace both at home and abroad at present
Road.
Summary of the invention
The present invention provides a kind of methods that molten iron is directly casting continuously to form steel billet, using continuous production mode, steel-making is each
Process is integrated, and is realized the quick processing of molten iron and is directly casting continuously to form base, saves blast furnace to Molten Iron Transportation process between converter,
And a series of auxiliary facilities needed for converter smelting, process has been simplified significantly, is saved production time and cost, is improved production
Efficiency.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of method that molten iron is directly casting continuously to form steel billet, process flow are as follows: desulfurizing iron is located in advance in blast furnace casting-ditch
Primary slagging-off-closing iron runner oxygen gun blowing-addition dephosphorization slag material-secondary slagging-off-steel structure-tundish-the crystallization of reason-
Device；Detailed process is as follows:
1) molten iron converges to an iron tap channel by a plurality of iron tap channel, guarantees the continuity of molten iron tapping；
2) molten iron flows in the first U-type groove, carries out the compound desulfurization of Ca-Mg using desulfuring spray gun in the first U-type groove；Pass through
Dreg discharging tunnel timing carries out deslagging to desulfurization slag；
3) molten iron after desulfurization flows into closed iron runner by the first tapping hole, and more oxygen rifles pair are used in closed iron runner
Molten iron carries out oxygen blast, determines oxygen blast oxygen pressure according to molten iron depth, guarantees that oxygen blast pool depth reaches 1/2 or more of molten iron depth；
4) molten steel after aoxidizing enters in the second U-type groove by the second tapping hole, by 18~22Kg/ tons of steel, passes through spray gun
Slag material is continuously blown in molten steel, slag material uses the powdered compound slag making of active lime+fluorite+light dolomite
Material, the weight ratio of each ingredient are active lime: fluorite: light dolomite=12~17:1:4~8；Clinker is arranged in timing
Slag；
5) deoxidation alloying operation is carried out to molten steel at the tapping hole of the second U-type groove, meets the molten steel warp of component requirements
Steel linked up long nozzle and enters tundish；
6) Metal in Tundish immerses crystallizer progress continuous casting operation through submersed nozzle.
Compared with prior art, the beneficial effects of the present invention are:
1) continuous production mode is used, steel-making each process is integrated, realize the quick processing of molten iron and is directly connected
Base is cast, has simplified process significantly, the production time is saved, improves production efficiency；
2) ton steel comprehensive energy consumption reduces, and refining efficiency, the thermal efficiency and recovery rate of iron improve；
3) raw material, semi-finished product, the handling repeatedly of finishing room and turnover process are eliminated, handling, transport, equipment, factory are related to
Area's land occupation, factory building and capital expenditure greatly reduce, reduce construction investment and production cost；
4) present invention has advanced and technological break-through, and the implementation of this method is the primary change to process for making, tool
There is epoch-making meaning.
Detailed description of the invention
Fig. 1 is the process flow chart for the method that a kind of molten iron of the present invention is directly casting continuously to form steel billet.
In figure: the closed iron runner of 1. iron tap channel, 2. 3. first U-type groove of dreg discharging tunnel, 4. desulfuring spray gun, 5. first tapping hole 6.
13. long nozzle of ditch 7. 8. second tapping hole of oxygen rifle, 9. 10. second U-type groove of slag former spray gun, 11. tapping hole 12. is tapped
14. 15. submersed nozzle of tundish, 16. crystallizer
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
As shown in Figure 1, the method that a kind of molten iron of the present invention is directly casting continuously to form steel billet, process flow are as follows: blast furnace goes out
Desulfurizing iron pretreatment-secondary slagging-off-of primary slagging-off-closing iron runner oxygen gun blowing-addition dephosphorization slag material-in iron-ditch
Steel structure-tundish-crystallizer；Detailed process is as follows:
1) molten iron converges to an iron tap channel 1 by a plurality of iron tap channel, guarantees the continuity of molten iron tapping；
2) molten iron flows in the first U-type groove 3, carries out the compound desulfurization of Ca-Mg using desulfuring spray gun 4 in the first U-type groove 3；
Deslagging is carried out to desulfurization slag by 2 timing of dreg discharging tunnel；
3) molten iron after desulfurization flows into closed iron runner 6 by the first tapping hole 5, and more oxygen are used in closed iron runner 6
Rifle 7 carries out oxygen blast to molten iron, determines oxygen blast oxygen pressure according to molten iron depth, guarantees that oxygen blast pool depth reaches the 1/2 of molten iron depth
More than；
4) molten steel after aoxidizing enters in the second U-type groove 10 by the second tapping hole 8, by 18~22Kg/ tons of steel, passes through spray
Slag material is continuously blown in molten steel by rifle 9, and slag material compound is made using active lime+fluorite+light dolomite is powdered
Slag charge, the weight ratio of each ingredient are active lime: fluorite: light dolomite=12~17:1:4~8；Clinker is arranged in timing
Slag；
5) deoxidation alloying operation is carried out to molten steel at the tapping hole 11 of the second U-type groove 10, meets the steel of component requirements
Water enters tundish 14 by long nozzle 13 through steel ditch 12；
6) 14 molten steel of tundish immerses the progress continuous casting operation of crystallizer 16 through submersed nozzle 15.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment 1] is for smelting Q235B steel grade；
1) 1480 DEG C of molten iron temperature, in the first U-type groove 3, by the compound desulfurization of Ca-Mg by desulfurizing iron to sulfur content
0.010%；
2) desulfurized molten iron passes through closed iron runner 6, makes FeO content in molten iron reach 18% by 7 oxygen blast of oxygen rifle；
3) in the second U-type groove 10, active lime+compound slag material of fluorite+light dolomite is blown by spray gun 9,
Each weight ratio of constituents is active lime: fluorite: light dolomite=15:1:6, main chemical compositions of tapping are as follows: carbon 0.11%, phosphorus
0.015%, sulphur 0.009%, 1665 DEG C of tapping temperature；
4) Alloying Treatment is carried out to molten steel at tapping hole 11, treated, and molten steel composition is C:0.16%；Si:
0.080%；Mn:0.27%；P:0.014%；S:0.016%；1570 DEG C of temperature；
5) molten steel is flowed into progress continuous casting operation in tundish 14 by long nozzle 13 and obtains finished product steel billet, closed through examining
Lattice.
[embodiment 2] is for smelting SPHC steel grade；
1) 1500 DEG C of molten iron temperature, in the first U-type groove 3, by the compound desulfurization of Ca-Mg by desulfurizing iron to sulfur content
0.005%；
2) desulfurized molten iron passes through closed iron runner 6, makes FeO content in molten iron reach 20% by 7 oxygen blast of oxygen rifle；
3) in the second U-type groove 10, active lime+compound slag material of fluorite+light dolomite is blown by spray gun 9,
Each weight ratio of constituents is active lime: fluorite: light dolomite=it is 15:1:6, main chemical compositions of tapping are as follows: carbon 0.05%,
Phosphorus 0.013%, sulphur 0.007%, 1670 DEG C of tapping temperature；
4) Alloying Treatment, treated molten steel composition C:0.06% are carried out to molten steel at tapping hole 11；Si:
0.007%:Mn:0.21%:P:0.013%:S:0.005%；1575 DEG C of temperature；
5) molten steel is flowed into progress continuous casting operation in tundish 14 by long nozzle 13 and obtains finished product steel billet, closed through examining
Lattice.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (1)
1. a kind of method that molten iron is directly casting continuously to form steel billet, which is characterized in that process flow are as follows: molten iron is de- in blast furnace casting-ditch
Sulphur pretreatment-primary slagging-off-closing iron runner oxygen gun blowing-addition dephosphorization slag material-secondary slagging-off-steel ditch-tundish-
Crystallizer；Detailed process is as follows:
1) molten iron converges to an iron tap channel by a plurality of iron tap channel, guarantees the continuity of molten iron tapping；
2) molten iron flows in the first U-type groove, carries out the compound desulfurization of Ca-Mg using desulfuring spray gun in the first U-type groove；Pass through deslagging
Road timing carries out deslagging to desulfurization slag；
3) molten iron after desulfurization flows into closed iron runner by the first tapping hole, using more oxygen rifles to molten iron in closed iron runner
Oxygen blast is carried out, oxygen blast oxygen pressure is determined according to molten iron depth, guarantees that oxygen blast pool depth reaches 1/2 or more of molten iron depth；
4) molten steel after aoxidizing enters in the second U-type groove by the second tapping hole, by 18~22Kg/ tons of steel, will be made by spray gun
Slag charge is continuously blown in molten steel, and slag material uses the powdered compound slag material of active lime+fluorite+light dolomite, respectively
The weight ratio of ingredient is active lime: fluorite: light dolomite=12~17:1:4~8；Timing carries out deslagging to clinker；
5) deoxidation alloying operation is carried out to molten steel at the tapping hole of the second U-type groove, meets the molten steel of component requirements through steel ditch
Enter tundish by long nozzle；
6) Metal in Tundish immerses crystallizer progress continuous casting operation through submersed nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610785836.6A CN107790649B (en) | 2016-08-31 | 2016-08-31 | A kind of method that molten iron is directly casting continuously to form steel billet |
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| CN201610785836.6A CN107790649B (en) | 2016-08-31 | 2016-08-31 | A kind of method that molten iron is directly casting continuously to form steel billet |
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| Publication Number | Publication Date |
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| CN107790649A CN107790649A (en) | 2018-03-13 |
| CN107790649B true CN107790649B (en) | 2019-06-25 |
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| CN201610785836.6A Active CN107790649B (en) | 2016-08-31 | 2016-08-31 | A kind of method that molten iron is directly casting continuously to form steel billet |
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| CN111500825B (en) * | 2020-06-04 | 2022-02-22 | 北京首钢股份有限公司 | Method for controlling titanium content behind steelmaking converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739108A (en) * | 1980-08-20 | 1982-03-04 | Sumitomo Metal Ind Ltd | Preparation of pig iron for casting |
| JPS5848614A (en) * | 1981-09-16 | 1983-03-22 | Nippon Steel Corp | Dephosphorizing method for molten iron |
| CN2661699Y (en) * | 2003-07-22 | 2004-12-08 | 承德新新钒钛股份有限公司 | Continuous desulphurization equipment for blast furnace liquid iron |
| CN1590564A (en) * | 2003-08-27 | 2005-03-09 | 宝山钢铁股份有限公司 | Molten iron pretreatment method |
| CN101020941A (en) * | 2007-03-14 | 2007-08-22 | 张登山 | Molten iron pre-treating method and apparatus |
| CN102321783A (en) * | 2011-09-19 | 2012-01-18 | 武汉钢铁(集团)公司 | Steel-making method of experimental induction furnace |
-
2016
- 2016-08-31 CN CN201610785836.6A patent/CN107790649B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739108A (en) * | 1980-08-20 | 1982-03-04 | Sumitomo Metal Ind Ltd | Preparation of pig iron for casting |
| JPS5848614A (en) * | 1981-09-16 | 1983-03-22 | Nippon Steel Corp | Dephosphorizing method for molten iron |
| CN2661699Y (en) * | 2003-07-22 | 2004-12-08 | 承德新新钒钛股份有限公司 | Continuous desulphurization equipment for blast furnace liquid iron |
| CN1590564A (en) * | 2003-08-27 | 2005-03-09 | 宝山钢铁股份有限公司 | Molten iron pretreatment method |
| CN101020941A (en) * | 2007-03-14 | 2007-08-22 | 张登山 | Molten iron pre-treating method and apparatus |
| CN102321783A (en) * | 2011-09-19 | 2012-01-18 | 武汉钢铁(集团)公司 | Steel-making method of experimental induction furnace |
Non-Patent Citations (2)
| Title |
|---|
| Ca-Mg系粉剂复合喷吹脱硫技术在鞍钢的应用;王玉彬等;《鞍钢技术》;20021231(第4期);21-23 |
| 铁沟喷粉工艺及应用;沙永志等;《钢铁研究学报》;19930930;第5卷(第3期);1-5 |
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