CN107201422B - A kind of production method of mild steel - Google Patents
A kind of production method of mild steel Download PDFInfo
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- CN107201422B CN107201422B CN201610154798.4A CN201610154798A CN107201422B CN 107201422 B CN107201422 B CN 107201422B CN 201610154798 A CN201610154798 A CN 201610154798A CN 107201422 B CN107201422 B CN 107201422B
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- steel
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Classifications
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- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/06—Deoxidising, e.g. killing
Abstract
The invention discloses a kind of production methods of mild steel, mainly solve the technical issues of Control and Inclusion Removal difficulty in the mild steel of converter smelting in the prior art is not able to satisfy the normal casting of slab caster, mild steel high production cost.The technical solution of the present invention is as follows: a kind of production method of mild steel, comprising the following steps: converter smelting, the tapping of converter lower temperature and deoxidation carry out steel treatment at Argon station, refine in refining furnace to molten steel.The Cleanliness of Molten Steel of the method for the present invention production is high, and total oxygen average content is 16.5ppm in molten steel, and phosphorus average content is 95ppm, and molten steel harmful element phosphorus content is greatly lowered, and ton steel molten steel production cost reduces by 13 yuan.
Description
Technical field
The present invention relates to a kind of production method of carbon steel, in particular to a kind of production method of mild steel belongs to converter refining
Steel technical field.
Background technique
The treatment process of converter smelting low-carbon steel molten-steel is that 1670~1700 DEG C of converter smelting endpoint go out in the prior art
Steel；In converter tapping alloying process, full deoxidation is carried out to molten steel, deoxidation then is modified to ladle top slag；It feeds at Argon station
Enter aluminum steel, adjusts molten steel aluminium content.The technique has both sides defect: first is that converter smelting endpoint temperature is high, high temperature is often
The molten steel of strong oxidizing property is brought, oxygen content is generally higher than 0.065%, and the quantity of slag increases under tapping process, is unfavorable for pressing from both sides in molten steel
The source of sundries controls；Second is that tapping process carries out full deoxidation to molten steel, the scaling loss of alfer is big, and deoxidation is at high cost, meanwhile,
A large amount of oxidations of alfer, generate a large amount of aluminum oxide, cause the slab caster of subsequent handling when casting slab
Aluminum oxide blocks the mouth of a river Frequent Troubles of tundish, influences continuous casting and normally produces, influences product quality, is unfavorable for improving production
The competitiveness of product.
Chinese patent CN 103468853A is disclosed " a kind of smelting process of mild steel ", and the patent is to carbon in reduction steel
Content and save smelting raw material be described.Chinese patent CN 1415764A disclose " a kind of deoxygenation of liquid steel and
The method of purification " is blown calcium carbonate fine powder into molten steel when molten steel is added in deoxidier, and to using rotating vane in molten steel
Agitating device is stirred, and removes the field trash in molten steel；Smelting molten steel is at high cost, also the undisclosed level of Cleanliness of Molten Steel.
Chinese patent CN 102212642A discloses " a kind of control method for improving ultra-low carbon steel end-point degree of purity ", should
Patent discloses the converter decarburization middle and later periods and manganese containing materials is added, and improves converter terminal molten steel manganese content to 0.15%~0.30%,
Slag beneficiation is reduced, reduces deoxygenated alloy consumption, to improve steel quality.Chinese patent CN 102634641A
Disclose " converter tapping deoxygenation of liquid steel method ", which disclose before converter tapping, be added into ladle by carbon dust, SiC and
CaC2Mixed 1.75~4.0kg/t of pre-deoxidant taps under conditions of 1660~1700 DEG C of converter, silicon is added in tapping process
0.5~2.5kg/t of aluminium barium calcium or ferro-aluminum deep deoxidation agent；Carbon dust, SiC and CaC is added before tapping into ladle2Mixed pre-deoxidation
Agent has certain security risk, and high tapping temperature makes the consumption of alfer big, and uneconomical.
The prior art, which still lacks, stablizes mild steel low cost, the production method of high quality.
Summary of the invention
The object of the present invention is to provide a kind of production methods of mild steel, mainly solve the low of converter smelting in the prior art
Control and Inclusion Removal difficulty is not able to satisfy the technical issues of normal casting of slab caster, mild steel high production cost in carbon steel.
The technical solution adopted by the present invention is that: a kind of production method of mild steel, comprising the following steps:
A, using the compound smelting in converter top bottom, the weight percent for putting into the raw material composition of metal major ingredient is molten iron 78%
~92%, surplus is light-duty steel scrap；Controlling converter smelting endpoint molten steel temperature is 1620~1640 DEG C；In converter terminal molten steel
The weight percentage of carbon be 0.025%~0.10%, tapping process ladle bottom blowing whole process argon gas, argon flow be 20~
40Nm3Deoxygenated alloy is added into ladle when the molten steel amount of converter tapping reaches the 25%~35% of molten steel total amount by/h, controls
The weight percentage of oxygen in molten steel is 0.02%~0.03%；
B, the molten steel in ladle is transported to Argon station, deoxidier is added, secondary deoxidation is carried out to molten steel, controls in molten steel
The weight percentage of oxygen is 0.005%~0.015%；Argon station treatment process ladle bottom blowing whole process argon gas, argon flow are
10~30Nm3/h；
C, the molten steel after secondary deoxidation is transported to refining furnace by Argon station, is added in the molten steel into ladle in refining furnace
Quick lime carries out slag making, heats liquid steel temperature to 1580~1595 DEG C；Then deoxidier is added, final deoxidizing, control is carried out to molten steel
Weight percentage≤0.0010% of oxygen in molten steel；Low carbon low silicon double deoxidizer is eventually adding to change ladle slag
Property, control w (CaO)/w (Al in ladle slag2O3) value be 1.0~1.5；Refining furnace treatment process ladle bottom blowing whole process argon gas, argon
Throughput is 20~40Nm3/h；
D, to having fed the progress of aluminum steel molten steel weak stirring, the weak stirring molten steel time is 6~10 minutes, obtains qualified molten steel.
Further, in step a of the present invention, the deoxygenated alloy used is alfer and manganeisen, the alfer
Additional amount according to formula 1 determine, formula 1:X1=(28~32) × ([%O]1- 0.02), in formula 1, X1For the addition of alfer
Amount, unit are kg/t steel, [%O]1For the weight percentage of oxygen in converter smelting endpoint molten steel；The addition of the manganeisen
Amount is determining according to formula 2, formula 2:X2=15 × ([%Mn] -0.08), in formula 2, X2For the additional amount of manganeisen, unit kg/t
Steel, [%Mn] are the weight percentage requirement of manganese in mild steel finished product.
In step b of the present invention, the deoxidier that the secondary deoxidation of molten steel uses is aluminum steel, and the additional amount of the aluminum steel is according to formula 3
It determines, formula 3:X3=14 × ([%O]2- 0.01), in formula 3, X3For aluminum steel additional amount, unit is kg/t steel, [%O]2For into blowing
The weight percentage of steel water oxygen when argon station.
In step c of the present invention, the additional amount of the quick lime is 2.6~3.6kg/t steel, the weight of quick lime chemical component
Percentage is CaO 90~98%, SiO22~5%, the sum of scaling loss and other ingredients≤5%；What the molten steel final deoxidizing used
Deoxidier is aluminum steel, and the additional amount of aluminum steel is determined according to formula 4, formula 4:X4=0.15+14 × [%Als], in formula 4, X4For aluminum steel plus
Enter amount, unit is kg/t steel, and [%Als] is the weight percentage of dissolved aluminum in mild steel finished product；The low carbon low silicon is compound
The additional amount of deoxidier is 0.8~1.2kg/t steel, and the weight percent of low carbon low silicon double deoxidizer chemical component is Al
26%~30%, Al2O340%~50%, CaO 15%~25%, SiO2≤ 10%, H2O≤1%.
Effect is preferred when molten steel exposed surface diameter≤200mm during weak stirring molten steel control Argon in step d of the present invention.
The present invention gradually carries out deoxidation, LF to molten steel using lower tapping temperature, alfer and aluminum steel by converter
Furnace slag making and the method for carrying out weak stirring to molten steel improve the stability of operation, improve steel quality and reduce smelting
It is smelt this.
The present invention has following good effect compared with prior art: 1, the present invention improves the stability of operation, and converter is adopted
With lower tapping temperature conducive to blowing end point control；Molten steel uses deoxidation three times, gradually reduces the oxygen content in molten steel, is conducive to
The stabilization of deoxidier utilization rate is conducive to deoxidation operation.2, the present invention improves steel quality, and converter uses lower converter tapping
Temperature, converter terminal Oxygen Content in Liquid Steel are reduced, and the production quantity of field trash can be controlled from source, is also beneficial to simultaneously
The control of harmful element phosphorus content；The primary and secondary deoxidation of molten steel is maintained in molten steel there are certain oxygen content, is avoided
The increase of nitrogen content in liquid steel, at the same when also controlling final deoxidizing field trash yield；Molten steel final deoxidizing ensure that molten steel oxygen contains
Amount is reduced to a very low level；LF furnace carries out slag making and ladle slag is modified, can control w in ladle slag (CaO)/w
(Al2O3) value be 1.0~1.5, be conducive to adsorb molten steel in field trash, improve Cleanliness of Molten Steel, can control molten steel total oxygen
Content is not more than 20ppm, solves the technical issues of slab caster cannot normally cast.3, present invention reduces smelting cost,
The tapping of converter lower temperature, reduces the consumption of converter slag-making auxiliary material, also shortens the smelting cycle of converter；Converter terminal molten steel compared with
The deoxidation three times of low oxygen content and molten steel improves the utilization efficiency of deoxidier, reduces the consumption of deoxidation alfer；Slab
The continuous pouring furnace number of conticaster is improved by 10 Baogang's water to 14 Baogang's water, reduces by 13 yuan of mild steel ton steel smelting cost.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
The embodiment as shown in table 1 to table 4, with 150 tons of the top and bottom combined blown converter smelting trade mark for 340CQ-1 car inner plate
For steel, converter steelmaking process bottom blown gas is argon gas.Technical solution includes: that converter smelting, converter lower temperature are tapped and taken off
Oxygen carries out steel treatment at Argon station and refines in refining furnace to molten steel.Concrete operations are as follows:
The converter smelting metal charge parameter of the present invention of table 1
The converter smelting index of the present invention of table 2 and endpoint molten steel control parameter
The converter tapping of the present invention of table 3 and refining treatment smelting molten steel parameter
The finished steel water chemical elements of the present invention of table 4 and cleanliness parameter
Steel treatment method disclosed by the invention, molten steel finished product phosphorus average content are 95ppm, are declined compared with prior art
70ppm；Molten steel total oxygen average content is 16.5ppm, declines 8ppm compared with the prior art.Molten steel harmful element phosphorus content is substantially
Degree reduces, and Cleanliness of Molten Steel is improved significantly, and product quality is improved, and reduces by 13 yuan of ton steel molten steel production cost.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (2)
1. a kind of production method of mild steel, characterized in that the method the following steps are included:
A, using the compound smelting in converter top bottom, the weight percent for putting into the raw material composition of metal major ingredient is, molten iron 78%~
92%, surplus is light-duty steel scrap；Controlling converter smelting endpoint molten steel temperature is 1620~1640 DEG C；Carbon in converter terminal molten steel
Weight percentage be 0.025%~0.10%, tapping process ladle bottom blowing whole process argon gas, argon flow be 20~40Nm3/
Deoxygenated alloy is added into ladle when the molten steel amount of converter tapping reaches the 25%~35% of molten steel total amount by h, controls in molten steel
Oxygen weight percentage be 0.02%~0.03%；
B, the molten steel in ladle is transported to Argon station, deoxidier is added, secondary deoxidation is carried out to molten steel, controls the oxygen in molten steel
Weight percentage is 0.005%~0.015%；Argon station treatment process ladle bottom blowing whole process argon gas, argon flow be 10~
30Nm3/h；
C, the molten steel after secondary deoxidation is transported to refining furnace by Argon station, raw stone is added in the molten steel into ladle in refining furnace
Ash carries out slag making, heats liquid steel temperature to 1580~1595 DEG C；Then deoxidier is added, final deoxidizing is carried out to molten steel, control molten steel
In oxygen weight percentage≤0.0010%；It is eventually adding low carbon low silicon double deoxidizer to be modified ladle slag, control
W (CaO)/w (Al in ladle slag processed2O3) value be 1.0~1.5；Refining furnace treatment process ladle bottom blowing whole process argon gas, argon gas stream
Amount is 20~40Nm3/h；
D, to having fed the progress of aluminum steel molten steel weak stirring, the weak stirring molten steel time is 6~10 minutes, obtains qualified molten steel；
The deoxygenated alloy that converter tapping process uses in the step a be alfer and manganeisen, the alfer
Additional amount is determining according to formula 1, formula 1:X1=(28~32) × ([%O]1- 0.02), in formula 1, X1For the additional amount of alfer,
Unit is kg/t steel, [%O]1For the weight percentage of oxygen in converter smelting endpoint molten steel；The additional amount of the manganeisen
It is determined according to formula 2, formula 2:X2=15 × ([%Mn] -0.08), in formula 2, X2For the additional amount of manganeisen, unit is kg/t steel,
[%Mn] is the weight percentage requirement of manganese in mild steel finished product；
The deoxidier that the secondary deoxidation of molten steel uses in the step b is aluminum steel, and the additional amount of the aluminum steel is determined according to formula 3, formula
3:X3=14 × ([%O]2- 0.01), in formula 3, X3For aluminum steel additional amount, unit is kg/t steel, [%O]2For into Argon station Shi Gang
The weight percentage of water oxygen；
The additional amount of quick lime is 2.6~3.6kg/t steel in the step c, and the weight percent of quick lime chemical component is
CaO90~98%, SiO22~5%, the sum of scaling loss and other ingredients≤5%；What molten steel final deoxidizing used in the step c is de-
Oxygen agent is aluminum steel, and the additional amount of aluminum steel is determined according to formula 4, formula 4:X4=0.15+14 × [%Als], in formula 4, X4For aluminum steel addition
Amount, unit are kg/t steel, and [%Als] is the weight percentage of dissolved aluminum in mild steel finished product；Low carbon low silicon in the step c
The additional amount of double deoxidizer is 0.8~1.2kg/t steel, and the weight percent of low carbon low silicon double deoxidizer chemical component is Al
26%~30%, Al2O340%~50%, CaO 15%~25%, SiO2≤ 10%, H2O≤1%.
2. a kind of production method of mild steel as described in claim 1, characterized in that weak stirring molten steel control in the step d
Molten steel exposed surface diameter≤200mm during Argon processed.
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| JPS58104111A (en) * | 1981-12-15 | 1983-06-21 | Nippon Steel Corp | Denitrifying method for disoxidized molten steel |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Process for manufacturing low-silicon low-carbon deep punching/drawing steel |
| CN103695601A (en) * | 2012-09-27 | 2014-04-02 | 上海梅山钢铁股份有限公司 | Processing method of molten steel used for checkered plate smelted in converter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU432205A1 (en) * | 1972-08-30 | 1974-06-15 | Г. С. Колганов, Е. А. Греков, Д. А. Смол ренко , В. О. Куликов | WAY OF DECOMPOSITION OF STALI; ^^: Ш,? ^ :: рТ "J5: I •. •: -, - f_, ^ '•' • -__- ^ '- ^ J |
| JPS58104111A (en) * | 1981-12-15 | 1983-06-21 | Nippon Steel Corp | Denitrifying method for disoxidized molten steel |
| CN101343677A (en) * | 2008-09-01 | 2009-01-14 | 湖南华菱涟源钢铁有限公司 | Process for manufacturing low-silicon low-carbon deep punching/drawing steel |
| CN103695601A (en) * | 2012-09-27 | 2014-04-02 | 上海梅山钢铁股份有限公司 | Processing method of molten steel used for checkered plate smelted in converter |
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