CN1257301C - Method for producing continuous casting alloy steel containing S and Al - Google Patents
Method for producing continuous casting alloy steel containing S and Al Download PDFInfo
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- CN1257301C CN1257301C CNB031154654A CN03115465A CN1257301C CN 1257301 C CN1257301 C CN 1257301C CN B031154654 A CNB031154654 A CN B031154654A CN 03115465 A CN03115465 A CN 03115465A CN 1257301 C CN1257301 C CN 1257301C
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 28
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 113
- 239000010959 steel Substances 0.000 claims abstract description 113
- 239000002893 slag Substances 0.000 claims abstract description 42
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000007670 refining Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 229910052786 argon Inorganic materials 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 12
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- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 239000004571 lime Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910003573 SiAlFe Inorganic materials 0.000 claims abstract description 5
- 229910004072 SiFe Inorganic materials 0.000 claims abstract description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 4
- 235000009566 rice Nutrition 0.000 claims abstract description 4
- 240000007594 Oryza sativa Species 0.000 claims abstract 2
- 238000005516 engineering process Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- 230000006698 induction Effects 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000003872 feeding technique Methods 0.000 claims description 4
- 238000009847 ladle furnace Methods 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 238000003763 carbonization Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 230000009970 fire resistant effect Effects 0.000 claims description 3
- 239000010903 husk Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 abstract description 4
- 235000013339 cereals Nutrition 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 229910052593 corundum Inorganic materials 0.000 abstract description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000013019 agitation Methods 0.000 abstract 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract 2
- 229910000712 Boron steel Inorganic materials 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 238000011084 recovery Methods 0.000 description 11
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 238000007667 floating Methods 0.000 description 6
- 150000002431 hydrogen Chemical class 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010000372 Accident at work Diseases 0.000 description 1
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- JNVCSEDACVAATK-UHFFFAOYSA-L [Ca+2].[S-]SSS[S-] Chemical compound [Ca+2].[S-]SSS[S-] JNVCSEDACVAATK-UHFFFAOYSA-L 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229940051851 sulfurated lime Drugs 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a production method for continuous casting alloy steel containing S and Al. The present invention is characterized in that a four-step method technological flow is adopted: (1) direct current electric furnace steel smelting: a SiAlFe deoxidizing agent with proper amount, carbon powder, alloy and slag materials are added in when tapping (1640 to 1660 DEG C); (2)LF furnace refining: (a) lime (CaO is greater than or equal to 90%), SiFe and C powder are added in batches, and white making slag and bottom blowing argon are made; (b) Ti is fed to steel containing boron to remain B; (c) top slag alkalinity is 2.8, an Al2O3 content in slag is 25%, and Al and S are adjusted; (3)vacuum furnace treatment: (a) a vacuum degree is less than or equal to 140Pa, the treatment of the bottom blowing argon is 20 minutes; (b) sampling and analysis after vacuum is broken, Al, Ti (containing boron steel) and SiCa are fed according to a target value order, and an S line is complemented and fed after weak agitation of 6 minutes; (d) B of the steel containing boron is adjusted; (e) carbonation rice hulls are added in after weak agitation of 10 minutes; (4) continuous casting pouring: (a) the steel holding amount of a middle bag is larger than 10 tons, and the superheating degree of an integral water opening is from 25 to 45 DEG C; (b) a pouring speed is 320 kilograms/min, and two-cold intensity is 0.5 L/kg; the electromagnetic agitation of a front end is 300A/5.0Hz, and the electromagnetic agitation of a tail end is 100A/11.0Hz, and the front end and the tail end are forwards and backwards rotated for 8 seconds. The patent of the present invention has advantages of excellent continuous casting and pouring performance, stable S yield and thin grain size. All indexes of a finished product conform to standards, and meet the requirements of machinery manufacturers.
Description
Technical field
The present invention relates to the production method of metallurgy industry steel alloy, especially the smelting casting process of S, Al steel alloy.
Background technology
Difference according to high-temperature molten steel casting form can be divided into two kinds of die casting and continuous castings.Die casting is that high-temperature molten steel is watered into steel ingot, is split into steel billet through blooming mill (or forging press), recovery rate of iron lower (about about 84%); Continuous casting is that high-temperature molten steel is directly watered into steel billet, recovery rate of iron higher (about about 98%).Therefore, adopting continuous casting technology to produce steel alloy and not only can improve recovery rate of iron greatly, reduce production costs, also is the developing direction of contemporary metallurgical technology.
As everyone knows: the S element in the steel, easily produce sulfide inclusion, influence the mechanical property (use properties) of steel, but containing an amount of S in the steel alloy finished product (contains S steel alloy S content and reaches 0.020～0.040%, S free-cutting steel S content is up to 0.100%), to mechanical property influence and little (sometimes not the influencing the mechanical property of steel) of steel, but can improve the cutting ability (machining property) of steel greatly; The Al alloy is a reductor commonly used in the steel-making, contains an amount of Al element (Al content 0.020～0.040%) in the steel alloy finished product, but the crystal grain of refinement steel improves the use properties of steel.Flourish along with Domestic Automotive Industry and engineering machinery industry, the market requirement of S, Al steel alloy is vigorous day by day.
The production method of S, Al steel alloy just occurs as far back as the nineties both at home and abroad, still, does not see the production technology document announcement of relevant continuous casting aspect so far, and steel-making producer understands blank to the processing method that the foreign-made merchant produces this type of steel in the native land.In recent years, domestic special steel enterprise also begins one's study and contains the smelting and the continuous casting technology of S, Al steel alloy, following process for making difficult point is perplexing steel-making manufacturers: (if smelt atmosphere is high oxygen condition to (1) hypoxemia, the Al alloy that adds so in the steel can only play the reductor effect, playing microalloying in the molten steel and can't enter--the crystal grain thinning effect, nonmetal inclusion is difficult to remove in the steel simultaneously.) under the condition, the stability of S element recovery rate (S element recovery rate instability easily causes sulfide inclusion control difficulty, influences the use properties of steel); (2) other control of non-metallic inclusion level such as sulfide inclusion thing; (3) poor (aluminum oxide and sulfurated lime are mingled with and easily are adsorbed on tundish submerged nozzle inwall watering property of continuous casting of molten steel in the steel, cause nozzle clogging), lead to industrial accident when serious, in addition, the middle water containing opening dross also easily causes liquid level fluctuation of crystallizer, the quality of prestige association steel.
Summary of the invention
The present invention develops the production method of a kind of S of containing, Al steel alloy, by the first refining of electric furnace, ladle furnace refining, the vacuum oven degassing and continuous caster cast, produce continuous irrigatation castability is excellent, the S recovery rate stable, the non-metallic inclusion rank is low, grain fineness number is thin S, Al continuous casting steel alloy, satisfy machinofacture merchant's high quality requirement.
The production method that contains S, Al continuous casting steel alloy provided by the invention, it is characterized in that: adopt four step rule smelting technology flow process, the direct current furnace more than 50 tons just refines-→ the BOTTOM ARGON BLOWING ladle furnace refining of corresponding tonnage-→ the vacuum oven degassing of corresponding tonnage-→ steel ladle pouring--tundish continuous casting steel alloy square billet.
The first step, the first refining of carrying out molten steel in the direct current furnace more than 50 tons is (if its capacity is less than 50 tons, during electric furnace steel tapping, oxidation sludge in the electric furnace is difficult for being blocked and enters in the molten steel, increase the weight of the task of LF deoxidation, desulfurization), the conventional tapping of EBT, tapping temperature is controlled at 1640～1660 ℃ (as tapping temperature greater than 1660 ℃, increase power consumption, the easy scaling loss of carbon dust that adds when tapping simultaneously causes the recovery rate of carbon to reduce, and tapping temperature is less than 1640 ℃, make furnaceman LF position molten steel temperature low excessively, LF refining intensification task increases the weight of.)。
In the process of direct current furnace tapping, add an amount of reductor, alloy, carburelant and refining slag, reductor is the sial reductor, and alloy is various essential iron alloys, and carburelant is a carbon dust, and refining slag is lime, drop down the brick slag charge.
In the process of direct current furnace tapping, tap began to add the SiAlFe reductor of 2.5～3.0 kilograms of/ton steel, and (SiAlFe proportion was greater than pure Al alloy at 20%～35% o'clock, be convenient to the abundant pre-deoxidation of molten steel, improve the recovery rate of Al, Al is oxidized to Al when reducing the ladle refining furnace refining simultaneously
2O
3Content), add carbon dust, alloy subsequently, tap just added 6.5-7.5kg/t lime (containing Cao 〉=90%) at 80%～95% o'clock, 1.0-1.2kg/t drops down brick and (contains SiO
2Be 32%, Al
2O
3Be 48%) etc. slag charge.
In second step, on AC system ladle refining furnace (capacity and direct current furnace are complementary), carry out the refining of molten steel:
(1) tapping is finished to LF stove (AC system ladle refining furnace) station and is controlled at≤15min.Oversize as the period, stir under the energy in that argon gas is high, the molten steel rapid heat dissipation causes that into furnaceman LF position molten steel temperature is too low, increases the weight of LF refining intensification task.Energising heats up, and adds 1.2～2.0 kilograms of/ton steel of lime (containing CaO 〉=90%) in two batches, and adopts the top of the slag deoxidation of 0.25～0.45 kilogram of/ton steel of SiFe powder, 0.15～0.35 kilogram of/ton steel of C powder, makes white slag.Ladle bottom is blown into argon gas simultaneously, and BOTTOM ARGON BLOWING intensity is controlled at 0.4～0.6MPa respectively.(BOTTOM ARGON BLOWING intensity is excessive, causes slag-metal reaction, molten steel to wash away seriously ladle lining, makes oxide compound, sulfide in the slag or in the refractory materials enter molten steel and oxide compound in the steel, sulfide are increased.BOTTOM ARGON BLOWING intensity is too small, and molten steel temperature and composition and slag-metal reaction are all inhomogeneous and abundant, causes the deoxidation of molten steel and inclusion thereof fully not to float, and alloy element is skewness in steel.)
(2) energising is after 20～25 minutes (it is even to change slag, and Chemical Composition is more stable), and sampling analysis is adjusted Al to an amount of (target value+scaling loss) by feeding Al line (being easy to the Al alloying), and other elements are according to target controlled.Add silica and (contain SiO
2〉=95%) 0.85～1.2 kilogram of/ton steel continues to add the thermalization slag.Top basicity of slag (%CaO/SiO
2) be controlled at 2.5～3, Al in the slag
2O
3(too high as the top basicity of slag, then slag desulfurization capacity was strong, and the slag sulfur capacity is big, causes the recovery rate instability of sulphur between content was controlled at 22%～30%; Low excessively as the top basicity of slag, slag corrodes the ladle slag system and increases the weight of, and causes ladle shortening in work-ing life, and the refractory materials that peels off simultaneously enters molten steel, becomes foreign impurity).
(3) after temperature reaches 1680～1690 ℃, adjust Al behind the sampling analysis to an amount of (a little more than target value), adjust S to the technological standard upper limit, the top of the slag evenly adds 0.40～0.60 kilogram of/ton steel SiFe powder (guaranteeing the good reducing atmosphere of vacuum process).
To S, the Al continuous casting steel alloy that does not contain the requirement of B elementary composition, enter the 3rd step smelting technology flow process; To S, the Al continuous casting steel alloy that contains the requirement of B elementary composition, continue the second step smelting technology flow process, implement to feed the solid N of Ti and protect the B technology.Adjust Al to target value+scaling loss when feeding the Al line, continue energising and heat up, temperature reaches 〉=1680 ℃ after, adjust Ti to an amount of by feeding the Ti line.
The 3rd step, on vacuum oven (capacity and direct current furnace are complementary), refining liquid steel is carried out vacuum-treat, reduce gas (oxygen, hydrogen, the nitrogen) content in the steel, reduce A (sulfide), B (oxide compound), C (silicate), D (point-like) non-metallic inclusion rank.(oxygen level reduces, and helps the raising of oxide inclusion minimizing, alloying Al yield of alloy; Hydrogen richness reduces, and helps the minimizing of white-spot defects; Nitrogen content reduces, and helps the minimizing of steel embrittlement phenomenon, the raising of B recovery rate; Gas gross reduces in the steel, helps the minimizing of defectives such as steel seminess, subsurface bubble).
(1) by the following condition of high vacuum degree of 140Pa (if vacuum tightness does not reach 140Pa, molten steel and slag can not full and uniformization and reactions in 15～20 fens clock times, deoxidation products in the steel can not fully float, oxygen in the steel, hydrogen, nitrogen content can not be reduced to the dreamboat value), vacuum time be 15～20 minutes to containing S, Al continuous casting steel alloy carries out vacuum-treat (if vacuum time was less than 15 minutes, cause: various reacting dynamics condition deficiencies, oxygen in the steel, hydrogen, nitrogen content can not be reduced to the dreamboat value respectively, and the sulfide inclusion rank can not satisfy machinofacture merchant's requirement; Vacuum time is greater than 20 minutes, causes after the vacuum temperature mark that falls easily, influence continuous casting and casts).
(2) during vacuum, the steel ladle bottom argon blowing pressure-controlling is at 0.20～0.40Mpa, and ladle bottom is blown into argon gas and makes molten steel and full and uniformization of slag and reaction, and the deoxidation products in the steel fully floats, and reduces oxygen, hydrogen, nitrogen content in the steel.
(3) behind the vacuum breaker, sampling, analyze, according to the analysis situation, adopt wire-feeding technique, according to target value, order feed Al (Al is element alloyed), the Ti (steel alloy that the B elementary composition requires, the solid N guarantor of enforcement hello Ti B technology), SiCa (0.10～0.25 kilogram of/ton steel of feeding SiCa line, carry out inclusion modification processing in the molten steel, make the Al2O3 inclusion become low melting point, improve continuous irrigatation castability) from the high-melting-point material; The weak stirring mended hello S line after 4～8 minutes.(as the feeding of SiCa line too much, cause the molten steel point-like inclusion easily, also can cause too much SiCa and S to influence continuous casting simultaneously and hold watering property) in conjunction with production CaS.
(4) the steel alloy composition contains the requirement of B element, B should be adjusted to the upper limit in the specification (composition standard), guarantees the hardening capacity of steel.
(5) the weak pressure-controlling that stirs was controlled at 〉=10min in 0.05～0.10Mpa, (strong excessively as weak stirring pressure, as to cause molten steel to expose again in air, secondary oxidation, pollution molten steel) time.(guarantee that steel inclusion has sufficient floating interval of floating dock, come-up power.)
(6) after weak the stirring, add carbonization rice husk (prevent heat loss through radiation, control the stable of superheating temperature).
To not containing the steel alloy of B elementary composition requirement, enter the 4th step smelting technology flow process; To the steel alloy that the B elementary composition requires, in the 3rd step smelting technology flow process, implement to feed the solid N of Ti and protect the B technology: behind the vacuum breaker, sampling, analyze,, adopt wire-feeding technique according to the analysis situation, order feeds Al, Ti, SiCa, and Al, Ti according to target are worth feeding, 0.10～0.25 kilogram of/ton steel of SiCa line;
The 4th step, continuous casting:
(1) by protective casing the molten steel in the ladle is watered melting steel amount into greater than 10 tons T type tundish, cleaning fully before using in the T type tundish, internal surface is as fire-resistant coating and the crack must not be arranged.(melting steel amount is too small, and molten steel is short in the tundish residence time, and to be mingled with floating interval of floating dock not enough for macrobead in the steel, easily produces the volume slag.)
(2) the continuous casting tundish adopts the whole mouth of a river, prevents that submerged nozzle filling pipe end and the following mouth of a river joint from because of air-breathing generation secondary oxidation, stopping up the mouth of a river.
(3) the secondary cooling intensity adopt 0.4～0.6L/kg the specific water (intensity of secondary cooling is excessive: heat exchange continuous casting blank temperature gradient is big, when aligning owing to be prone to crackle and subcrack between stress surface and the center; Intensity of secondary cooling is too small: easily cause continuous casting billet skin temperature too high, creep takes place and produces the bulge defective in solidified shell easily.)。
(4) the head end induction stirring is controlled at 250～320A/5.0Hz, and terminal induction stirring is controlled at 70～150A/11.0Hz, controls the rotation in positive and negative 5～10 seconds of terminal induction stirring simultaneously.(induction stirring is strong excessively, and white band increases, and influences the use properties of steel)
(5) the tundish superheating temperature is controlled at 25～45 ℃.(superheating temperature is too high: steel billet easily cracks, and center segregation, shrinkage cavity defect are serious, and continuously cast bloom shell thickness differs, and easily causes bleedout; Superheating temperature is low excessively: be unfavorable for steel inclusion come-up, cause that easily the mouth of a river freezes, force cast to be interrupted.)。
(6) casting rate is 270～380 kilograms/min.(pulling rate is too fast: the liquid core of continuous casting billet cave increases, and the continuously cast bloom shell is too thin, easily produces the bleedout accident, is with liquid core aligning to be easy to generate stress crack simultaneously.Pulling rate is slow excessively: influence continuous caster throughput.)
Compare with prior art, the present invention has following advantage:
1, molten steel clarity height, gas (oxygen, hydrogen, nitrogen) content is low.
2, sulfide, oxide compound, silicate, point-like non-metallic inclusion rank are low.
3, the technology suitability is strong, is suitable for the production of high request S, Al steel alloy.
4, production cost is low, compares with moulded steel technology, and the billet yield of steel improves more than 13%.
Specific embodiments
Certain Iron And Steel Company implements patent of the present invention, produces 1 stove and contains S, Al continuous casting steel alloy (the crawler belt steel of the U.S. 1E1813 of the Caterpillar company trade mark), and this crawler belt also contains the requirement of B elementary composition with steel, and its standard and detection data see Table one.Technical process is that 100 tons of direct current furnaces just refine (EBT tapping, the sial reductor, carburelant, various essential iron alloys, with the interpolation refining slag)---100 tons of ladle furnace refinings (BOTTOM ARGON BLOWING)---100 tons of vacuum ovens degassings---continuous casting: the first step, in the 100T direct current furnace, feed galvanic current and input oxygen, make the furnace charge fusing of packing into become the interior molten steel of 1640～1660 ℃ of temperature ranges, the conventional tapping of EBT, begin to add the SiAlFe reductor of 280kg when tapping 30t, add required alloy subsequently, tap just adds lime 750kg (containing CaO 〉=90%) more than 90t, drop down brick 120k and (contain SiO
2Be 32%, Al
2O
3Be 48%) the 120k slag charge.In second step, (1) tapping is complete to be controlled at≤15min to furnaceman LF position, and the energising of (2) LF stove adds 150kg lime (containing CaO 〉=90%) in two batches, adopts 30SiFe powder and the deoxidation of the 20kgC top of the slag simultaneously, makes white slag.Argon pressure is controlled at 0.4～0.6Mpa, switches on after 25 minutes, and sampling analysis is adjusted Al to 0.040%, and other elements are according to target controlled.(3) continue energising and heat up, temperature reaches 〉=1680 ℃ after, adjust Ti to 0.10%, add silica 100kg simultaneously and (contain SiO
2〉=95%), continues to add the thermalization slag.(4) top basicity of slag (%CaO/SiO
2) being controlled at 2.5～3, Al2O3 content is controlled between 22%～30% in the slag, after temperature reaches 1680～1690 ℃, adjusts Al to 0.045% behind the sampling analysis, adjusts S to 0.035%, and the top of the slag evenly adds the 50kgSiFe powder, advances the VD vacuum outgas.In the 3rd step, (1) is following by 66.7Pa vacuum tightness, vacuum time is 〉=15min minute vacuum-treat; (2) during vacuum, the steel ladle bottom argon blowing pressure-controlling is at 0.20～0.40Mpa; (3) behind the vacuum breaker, sampling is analyzed, and according to the analysis situation, feeds Al, Ti, SiCa, weak stirring according to target, in proper order and mends hello S line after 5 minutes; (4) B is adjusted to the upper limit in the specification; (5) after the vacuum, weak stirring pressure-controlling 0.05～0.10Mpa, the time is controlled at 〉=10min, makes steel inclusion that sufficient floating interval of floating dock be arranged; (6) after weak the stirring, add carbonization rice husk 20 bags.The 4th step, by protective casing with the molten steel in the ladle water into use before cleaning fully, internal surface as fire-resistant coating and must not crannied melting steel amount in 10 tons T type tundish.The 5th step, 5 machines, 5 stream casters, make the molten steel in the tundish divide 5 flow points not enter in 5 crystallizers by the dummy head in the crystallizer, well-regulated vibration by each crystallizer simultaneously makes molten steel in the process that progressively moves down, under the stirring of the magnetic stirrer of the cooling of the water coolant of the stirring of crystallizer magnetic stirrer, secondary cooling zone, secondary cooling zone end, be frozen into 180 * 180mm2 continuously cast bloom gradually.The continuous casting tundish adopts the whole mouth of a river, prevents that submerged nozzle filling pipe end and following mouth of a river joint are because of air-breathing generation secondary oxidation; The secondary cooling intensity adopts the specific water of 0.5L/kg; The head end induction stirring is controlled at 300A/5.0Hz, and terminal induction stirring is controlled at 100A/11.0Hz, controls the rotation in positive and negative 10 seconds of terminal induction stirring simultaneously; The tundish superheating temperature is controlled at 25～45 ℃.
Implement 1E1813 trade mark crawler belt that patented method of the present invention produces with steel 180 * 180mm 2 continuously cast blooms (containing S, Al, B continuous casting steel alloy).Has the advantage that the S recovery rate is stable, grain fineness number is thin, the technology suitability is strong, gas contents such as oxygen, hydrogen, nitrogen are low in the steel, sulfide (category-A), oxide compound (category-B), silicate (C class), point-like non-metallic inclusion ranks such as (D classes) are low, and every technical data all satisfies the requirement of standard; Solve the technical barrier that contains S, watering property of Al alloy steel continuous casting difference simultaneously, even water the stove number rises to 4 stoves from beginning 1 stove to continuous casting.Compare with moulded steel technology, the billet yield of steel improves greatly, has reduced production cost.Satisfy machinofacture merchant's requirement.
Table one
| Detect content | Standard | Detect data | |
| Chemical Composition | C | 0.23～0.28％ | 0.26％ |
| Si | 0.15～0.35％ | 0.25％ | |
| Mn | 1.0～1.3％ | 1.2％ | |
| S | 0.015～0.030％ | 0.025％ | |
| Al | 0.020～0.040％ | 0.025％ | |
| B | 0.0005～0.003％ | 0.0023％ | |
| The non-metallic inclusion rank | A is thin | ≤ 3 grades | 2 grades |
| A is thick | ≤ 2 grades | 1 grade | |
| B is thin | ≤ 2.5 grades | 1.5 level | |
| B is thick | ≤ 1.5 grades | 1 grade | |
| C is thin | ≤ 1 grade | 0 grade | |
| C is thick | ≤ 1 grade | 0 grade | |
| D is thin | ≤ 1.5 grades | 1 grade | |
| D is thick | ≤ 1.0 grades | 0.5 level | |
| Grain fineness number | 〉=5 grades | 7 grades | |
| Hardening capacity | J1.5 | 45-52HRC | 50HRC |
| J9 | ≥34HRC | 45HRC | |
| J15 | ≤34HRC | 30HRC |
Claims (2)
1, the production method that contains S, Al continuous casting steel alloy, it is characterized in that the direct current furnace more than 50 tons just refines-→ the BOTTOM ARGON BLOWING ladle furnace refining of corresponding tonnage-→ the vacuum oven degassing of corresponding tonnage-→ the four step rule smelting technology flow process of steel ladle pouring-tundish continuous casting steel alloy square billet:
The first step is carried out the first refining of molten steel in the direct current furnace more than 50 tons, the conventional tapping of EBT, and tapping temperature is controlled at 1640～1660 ℃; In the tapping process of direct current furnace, routinely, add an amount of reductor, alloy, carburelant and refining slag, reductor is the sial reductor, and alloy is various essential iron alloys, and carburelant is a carbon dust, and refining slag is lime, drop down the brick slag charge;
In second step, on the LF AC system ladle refining furnace that capacity and direct current furnace are complementary, carry out the refining of molten steel: (1) tapping is complete to be controlled at≤15min to furnaceman LF position; Energising heats up, add 1.2～2.0 kilograms of/ton steel of lime that contain CaO 〉=90% in two batches, and adopt the top of the slag deoxidation of 0.25～0.45 kilogram of/ton steel of SiFe powder, 0.15～0.35 kilogram of/ton steel of C powder, and ladle bottom is blown into argon gas simultaneously, and BOTTOM ARGON BLOWING intensity is respectively at 0.4～0.6Mpa; (2) energising sampling analysis after 20～25 minutes is adjusted Al to target value+scaling loss by feeding the Al line, and other elements are according to target controlled; And adding contains SiO
20.85～1.2 kilogram of/ton steel of 〉=95% silica; The top basicity of slag is controlled at 2.5～3, and the top basicity of slag is exactly %Cao/SiO
2, Al in the slag
2O
3Content is controlled between 22%～30%; (3) after temperature reaches 1680～1690 ℃, adjust Al behind the sampling analysis to a little more than target value, adjust S to the technological standard upper limit, the top of the slag evenly adds 0.40～0.60 kilogram of/ton steel SiFe powder;
To S, the Al continuous casting steel alloy that does not contain the requirement of B elementary composition, enter the 3rd step smelting technology flow process; To S, the Al continuous casting steel alloy that contains the requirement of B elementary composition, continue the second step smelting technology flow process, implement to feed the solid N of Ti and protect the B technology: adjust Al to target value+scaling loss when feeding the Al line, continue energising and heat up, temperature reaches 〉=1680 ℃ after, feed the Ti line and adjust Ti to an amount of;
The 3rd step, on the vacuum oven that capacity and direct current furnace are complementary, refining liquid steel is carried out vacuum-treat, reduce the gas content in the steel, reduction non-metallic inclusion rank: by the condition of high vacuum degree below the 140Pa, vacuum time is 15～20 minutes; During vacuum, the steel ladle bottom argon blowing pressure-controlling is at 0.20～0.40Mpa; Behind the vacuum breaker, sampling is analyzed, and according to the analysis situation, adopts wire-feeding technique, and order feeds Al, SiCa, and Al according to target is worth, 0.10～0.25 kilogram of/ton steel of SiCa line; The weak stirring mended hello S line after 4～8 minutes; The steel alloy composition contains the requirement of B element, B should be adjusted to the upper limit in the specification; The weak pressure-controlling that stirs was controlled at 〉=10min in 0.05～0.10Mpa, time; After weak the stirring, add an amount of carbonization rice husk;
To not containing the steel alloy of B elementary composition requirement, enter the 4th step smelting technology flow process; To the steel alloy that the B elementary composition requires, in the 3rd step smelting technology flow process, implement to feed the solid N of Ti and protect the B technology: behind the vacuum breaker, sampling, analyze,, adopt wire-feeding technique according to the analysis situation, order feeds Al, Ti, SiCa, and Al, Ti according to target are worth feeding, 0.10～0.25 kilogram of/ton steel of SiCa line;
The 4th step, continuous casting: by protective casing the molten steel in the ladle is watered melting steel amount into greater than 10 tons T type tundish, clear up fully before using in the T type tundish, internal surface is as fire-resistant coating and the crack must not be arranged; The continuous casting tundish adopts the whole mouth of a river; The secondary cooling intensity adopts the specific water of 0.4～0.6L/kg; The head end induction stirring is controlled at 250～320A/5.0Hz, and terminal induction stirring is controlled at 70～150A/11.0Hz, controls the rotation in positive and negative 5～10 seconds of terminal induction stirring simultaneously; The tundish superheating temperature is controlled at 25～45 ℃; The molten steel casting rate is 270～380 kilograms/min.
2, the production method that contains S, Al continuous casting steel alloy according to claim 1, it is characterized in that carrying out in the direct current furnace molten steel when just refining, in the process of direct current furnace tapping, tap began to add the SiAlFe reductor of 2.5～3.0 kilograms of/ton steel at 20%～35% o'clock, add carbon dust, alloy subsequently, tap is at 80%～95% o'clock, just adds 6.5～7.5kg/t lime, 1.0～1.2kg/t drops down the brick slag charge, lime contains CaO 〉=90%, drops down brick and contains 32% SiO
2, 48% Al
2O
3
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| CN105695876B (en) * | 2016-02-14 | 2017-07-18 | 江阴南工锻造有限公司 | The smelting process and steel for wind power spindle of a kind of steel for wind power spindle |
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