CN106702074B - A kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel even pours method - Google Patents

A kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel even pours method Download PDF

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CN106702074B
CN106702074B CN201510796156.XA CN201510796156A CN106702074B CN 106702074 B CN106702074 B CN 106702074B CN 201510796156 A CN201510796156 A CN 201510796156A CN 106702074 B CN106702074 B CN 106702074B
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steel
slag
blowing
tapping
tons
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CN106702074A (en
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刘文飞
马宁
王鲁毅
金百刚
徐国义
尹宏军
李海峰
张立夫
赵雷
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Angang Steel Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02P10/00Technologies related to metal processing
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Abstract

The present invention provides a kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel and even pours method, first arranges one to pour ladle and vacuum chamber that secondary low silicon aluminium killed steel rinses preparation before production, sulphur≤0.0010% after desulfurizing iron;Converter is opened blow after add in active lime, light dolomite and 2/3 ore, 4~5min molten iron deslagging of blowing;Then slag making again;It blows to 8.5~9.5min, temperature is tapped when reaching 1400~1450 DEG C, ensures tapping C:2.00~2.30%, P < 0.025%;Decarbonizing furnace, which is opened, blows preceding addition temperature raising carburant, and terminal C taps when being 0.03~0.05%, and tapping process forbids slag;LF furnace roof slags Als needs are accurately controlled to 0.015~0.020%;RH vacuum degrees≤cycling of 200Pa >=30min, after breaking sky, 15~20min of BOTTOM ARGON BLOWING.The controllable tapping P10~20ppm of the present invention, rephosphorization is within 15ppm, and finished product P is within 35ppm.LF process cycles foreshorten to 70min, and company pours tank number and improves to 4 tanks, and iron and steel stock reduces 52kg/t steel.

Description

A kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel even pours method
Technical field
The invention belongs to smelting process technical field more particularly to a kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tank molten steel Method is poured by purifying company.
Background technology
Extremely low phosphorus, sulfur high-alloy steel, such as ultralow temperature pressure vessel steel 9Ni, ingredient:Nickel 9%, phosphorus are less than 0.005%, and sulphur is small In 0.002%, for such steel grade, the current way of Anshan iron and steel plant is:Phosphorus composition control tap in 20ppm or so, in order to control finished product Phosphorus content conforms to quality requirements, and rephosphorization of molten steel is controlled using tapping pushing off the slag+molten steel slag skimming process.After taking the technique, LF is forced Processing is divided into three steps:1st, enter the station and first heat up, but without steel slag modification, to prevent rephosphorization after modification;2nd, carried out after heating up Molten steel is skimmed;3rd, reducing slag desulfurization is made.So the process cycle of LF is especially long, is mismatched with the casting machine duration of pouring.It therefore can only One tank is individually poured into a mould, and is at most realized 2 tanks and is even poured.Nangang then using the multiple deslagging method of converter, control tapping phosphorus in 30ppm, after The method in face is identical with above-mentioned measure.Taiyuan Iron and Steel Co. converter is blown by normal smelting mode, and de- P agent first is added in ladle before tapping It is interior, take converter tapping process dephosphorization in ladle, molten steel is taken off after P skims, and 9Ni steel is produced in the method for the deeply de- S of LF.Anshan iron and steel plant and Nangang's LF refining needs time average out to 150min, and Taiyuan Iron and Steel Co. LF stove processing times are more than 150min.The above method there are the problem of: First, since the steel treatment time is long, molten steel is seriously polluted, steel grade degradation.Second is that it is very little due to singly pouring time tank number, it discards Product are more, and a variety of materials consumption is big, causes ton steel production cost excessively high.
The content of the invention
It is contemplated that exploitation one kind can reduce ladle, RH vacuum rephosphorization, shorten LF process cycles, tank pours in the company of raising Number, the pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel for reducing ton steel production cost even pour method.
For this purpose, the technical solution that the present invention is taken is:
A kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel even pours method, and specific method is:
(1) before converter producing, arrange one to pour time low silicon aluminium killed steel, control converter tapping P≤0.015%, and it is true to RH Blank pipe rinse pipe 2 times or more;
(2) contain the ladle of molten steel and rinse tank 2 times or more using low silicon aluminium killed steel, control ladle rephosphorization;
(3) 0.2~0.6%, 1280~1400 DEG C of temperature, steel scrap uses frivolous pure steel scrap, steel scrap for molten iron Si controls Than for 80~93kg/ tons of iron, loading sequence is hot metal charging first plus after steel scrap;
(4) sulphur≤0.0010% after molten iron pre-desulfurization is skimmed thoroughly, molten iron face non-block accumulated slag;
(5) converter uses double-united gear oil pump, and dephosphorization furnace roof rifle oxygen blast intensity is set as the 85~90% of normally blowing intensity, Bottom blowing flow set is maximum stream flow;It opens and 14~16kg/ tons of steel of active lime, 4.5~5.5kg/ of light dolomite is added in after blowing Ton steel, ore add in the 2/3 of total amount according to thermal balance, and blow 4~5min, blunderbuss slagging when clinker enlivens, by furnace interior point height Phosphorus slag is bled off, and is then proceeded to lower rifle and is blown, slag making again, addition 14~16kg/ tons of steel of active lime, and light dolomite 2.5~ 3.5kg/ tons of steel and remaining ore;Tapping temperature of the half steel, that is, dephosphorization stove when blowing is to 8.5~9.5min before control converter Degree is at 1400~1450 DEG C, carbon content 2.00~2.30% of tapping, dephosphorization stove tapping phosphorus < 0.025%;
(6) decarbonizing furnace elder generation hot metal charging, adds nickel plate, opens before blowing, and adds in 11~13kg/ tons of carburant for being capable of temperature raising Steel, top gun use normal oxygen blast intensity, and bottom blowing flow set is maximum stream flow;It opens and active 38~42kg/ tons of lime is added in after blowing The refining fluxing slag of steel, 9~11kg/ tons of steel of light dolomite and 3.5~4.5kg/ tons of steel;Aim carbon control 0.03~ 0.05%, 1600~1620 DEG C of tapping temperature, hanging pot temperature is controlled at 1580 DEG C or more;
(7) one piece of plug brick is filled in again outside the former plug brick of tapping hole before tapping;Latter stage with pushing off the slag mark pushing off the slag, forbids slag;
(8) during desulfurization process, slag making materials does not allow to power up stone and fluxing slag LF refining furnace;Push up slag upgrading processes The growing amount of middle Als is controlled 0.015~0.020%;
(9) during RH vacuum refinings degassing process, vacuum degree≤200Pa, circulation time >=30min, after breaking sky, molten steel With 30~40m3Then flow 15~20min of BOTTOM ARGON BLOWING of/min takes out of machine cast.
Beneficial effects of the present invention are:
1st, decarbonizing furnace enters stove molten iron phosphorus content less than 0.025%, reduces P in decarburization clinker2O5Content adds in carburant Temperature raising material ensures that converter terminal carbon reduces the extent of peroxidation of molten steel, is conducive to control tapping process slag rephosphorization.
2nd, improve converter and take out of temperature, cancel molten steel slag skimming process, LF is made to heat up and modification desulfurization is carried out at the same time, shortening LF Process cycle is allowed to match with casting machine casting cycle, realizes that multiple tank even pours.
3rd, technology even is poured due to realizing multiple tank, can greatly saves process energy consumption, release steel-making production capacity is eliminated because of production The adverse effect of the serious weight of extremely low phosphorus, sulfur high-alloy steel.
4th, since tank number pours in the company of adding, reduce waste products loss, the refractory consumptions such as middle bag are substantially reduced, so as to effectively Reduce smelting cost.
5th, converter tapping hanging pot temperature improves 30 DEG C or more compared to traditional handicraft, and the LF heating-up times shorten more than half, subtract Lack the quantity that molten steel is mingled with generation, improve the quality of molten steel.
Therefore, the present invention can be by tapping phosphorus content control in 10~20ppm, and within 15ppm, finished product phosphorus contains zeroing fault Amount control is within 35ppm.LF process cycles foreshorten to 70min by original 150min, realize and casting machine duration of pouring phase Matching, company pour tank number and are improved by 2 tanks to 4 tanks, and iron and steel stock reduces 52kg/t steel, and ton steel can save 520 yuan of iron and steel stock cost, simultaneously 200 yuan of processing charges can be saved.
Specific embodiment
Below by taking 260 tons of top and bottom combined blown converter smelting ultralow temperature pressure vessel steel 9Ni as an example, the present invention is made furtherly It is bright.
Embodiment 1:
1st, before converter producing, arrange one to pour time low silicon aluminium killed steel, control converter tapping P≤0.015%, and to RH vacuum Pipe carries out rinsing pipe 3 times.
2nd, the ladle for containing molten steel carries out rinsing tank 4 times using low silicon aluminium killed steel, controls ladle rephosphorization.
3rd, molten iron Si controls are 0.4%, 1350 DEG C of temperature, and steel scrap uses frivolous pure 25 tons of steel scrap, 270 tons of molten iron, dress Material order prevents steel scrap from gluing big face first to add hot metal charging after steel scrap.
4th, sulphur 0.0010% after molten iron pre-desulfurization is skimmed thoroughly, molten iron face non-block accumulated slag.
5th, converter uses double-united gear oil pump, and in order to improve dephosphorization effect early period, dephosphorization furnace roof rifle oxygen blast flow set is 48000m3/ h, bottom blowing flow set are 26Nm3/min.It opens and 15kg/ tons of steel of active lime, 5kg/ tons of light dolomite is added in after blowing Steel, ore add in the 2/3 of total amount according to thermal balance, and blow 4.5min, blunderbuss slagging when clinker enlivens, by the high phosphorus slag of furnace interior point It bleeds off.Then proceed to the blowing of lower rifle, slag making again adds in 15kg/ ton steel of active lime, 3kg/ tons of steel of light dolomite and remains Remaining ore.Tapping temperature of the half steel, that is, dephosphorization stove when blowing is to 9min is at 1420 DEG C before controlling converter, carbon content of tapping 2.10%, dephosphorization stove taps phosphorus 0.018%.
6th, 25 tons of nickel plate is added in scrap box after decarbonizing furnace iron making, opens 3 tons of carburant for being added in before blowing and being capable of temperature raising, top gun Oxygen blast flow set is 53700m3/ h, bottom blowing flow set are 26Nm3/min.It opens and 40kg/ tons of steel of active lime is added in after blowing, gently The refining fluxing slag of 10kg/ tons of steel of calcined dolomite and 4kg/ tons of steel.Aim carbon control is 0.05%, 1618 DEG C of tapping temperature, Hanging pot temperature is controlled at 1593 DEG C.
7th, using double plug bricks, one piece of plug brick is filled in again outside the former plug brick of tapping hole before tapping;Latter stage with pushing off the slag mark pushing off the slag, forbids Slag.
8th, LF refining furnace takes out of Als 0.018%, makes molten steel that can realize deep desulfurization target but also inhibit Al2O3Field trash Generation.
9th, during RH vacuum refinings degassing process, vacuum degree is in 200Pa, circulation time 30min, after breaking sky, molten steel With 35m3Then the flow BOTTOM ARGON BLOWING 18min of/min takes out of machine cast.
Embodiment 2:
1st, before converter producing, arrange one to pour time low silicon aluminium killed steel, control converter tapping P≤0.015%, and to RH vacuum Pipe carries out rinsing pipe 4 times.
2nd, the ladle for containing molten steel carries out rinsing tank 3 times using low silicon aluminium killed steel, controls ladle rephosphorization.
3rd, molten iron Si controls are 0.5%, 1320 DEG C of temperature, and steel scrap uses frivolous pure 23 tons of steel scrap, 270 tons of molten iron, dress Material order prevents steel scrap from gluing big face first to add hot metal charging after steel scrap.
4th, sulphur 0.0008% after molten iron pre-desulfurization is skimmed thoroughly, molten iron face non-block accumulated slag.
5th, converter uses double-united gear oil pump, and dephosphorization furnace roof rifle oxygen blast flow set is 48000m3/ h, bottom blowing flow set are 25Nm3/min.It opens and 15.5kg/ tons of steel of active lime is added in after blowing, 4.8kg/ tons of steel of light dolomite, ore adds according to thermal balance Enter the 2/3 of total amount, blow 5min, blunderbuss slagging when clinker enlivens, and the high phosphorus slag of furnace interior point is bled off.Lower rifle is then proceeded to blow Refining, again slag making add in 14.5kg/ tons of steel of active lime, 2.8kg/ tons of steel of light dolomite and remaining ore.Control turns Tapping temperature of the stokehold half steel, that is, dephosphorization stove when blowing is to 9min is at 1430 DEG C, carbon content 2.20% of tapping, the tapping of dephosphorization stove Phosphorus is 0.020%.
6th, 25 tons of nickel plate is added in scrap box after decarbonizing furnace iron making, opens 3 tons of carburant for being added in before blowing and being capable of temperature raising, top gun Oxygen blast flow set is 53700m3/ h, bottom blowing flow set are 25Nm3/min.It opens and 41kg/ tons of steel of active lime is added in after blowing, gently The refining fluxing slag of 10.5kg/ tons of steel of calcined dolomite and 3.8kg/ tons of steel.Aim carbon control is 0.04%, tapping temperature 1615 DEG C, hanging pot temperature is controlled at 1590 DEG C.
7th, using double plug bricks, one piece of plug brick is filled in again outside the former plug brick of tapping hole before tapping;Latter stage with pushing off the slag mark pushing off the slag, forbids Slag.
8th, LF refining furnace takes out of Als 0.016%, makes molten steel that can realize deep desulfurization target but also inhibit Al2O3Field trash Generation.
9th, during RH vacuum refinings degassing process, vacuum degree is in 220Pa, circulation time 35min, after breaking sky, molten steel With 36m3Then the flow BOTTOM ARGON BLOWING 17min of/min takes out of machine cast.

Claims (1)

1. a kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel even pours method, it is characterised in that:
(1) before converter producing, arrange one to pour time low silicon aluminium killed steel, control converter tapping P≤0.015%, and to RH vacuum tubes Rinse pipe 2 times or more;
(2) contain the ladle of molten steel and rinse tank 2 times or more using low silicon aluminium killed steel;
(3) 0.2~0.6%, 1280~1400 DEG C of temperature, steel scrap uses frivolous pure steel scrap for molten iron Si controls, and scrap ratio is 80~93kg/ tons of iron, loading sequence are first to add hot metal charging after steel scrap;
(4) sulphur≤0.0010% after molten iron pre-desulfurization is skimmed thoroughly, molten iron face non-block accumulated slag;
(5) converter uses double-united gear oil pump, and dephosphorization furnace roof rifle oxygen blast intensity is set as the 85~90% of normally blowing intensity, bottom blowing Flow set is maximum stream flow;It opens and 14~16kg/ tons of steel of active lime is added in after blowing, 4.5~5.5kg/ tons of steel of light dolomite, Ore adds in the 2/3 of total amount according to thermal balance, and blow 4~5min, blunderbuss slagging when clinker enlivens, and the high phosphorus slag of furnace interior point is put Fall, then proceed to lower rifle blowing, slag making again adds in 14~16kg/ tons of steel of active lime, 2.5~3.5kg/ of light dolomite Ton steel and remaining ore;Tapping temperature of the half steel, that is, dephosphorization stove when blowing is to 8.5~9.5min exists before control converter 1400~1450 DEG C, carbon content 2.00~2.30% of tapping, dephosphorization stove tapping phosphorus < 0.025%;
(6) decarbonizing furnace elder generation hot metal charging, adds nickel plate, opens before blowing, and adds in the 11~13kg/ tons of steel of carburant for being capable of temperature raising, top Rifle uses normal oxygen blast intensity, and bottom blowing flow set is maximum stream flow;It opens and 38~42kg/ tons of steel of active lime is added in after blowing, gently The refining fluxing slag of 9~11kg/ tons of steel of calcined dolomite and 3.5~4.5kg/ tons of steel;Aim carbon control 0.03~ 0.05%, 1600~1620 DEG C of tapping temperature, hanging pot temperature is controlled at 1580 DEG C or more;
(7) one piece of plug brick is filled in again outside the former plug brick of tapping hole before tapping;Latter stage with pushing off the slag mark pushing off the slag, forbids slag;
(8) during desulfurization process, slag making materials does not allow to power up stone and fluxing slag LF refining furnace;It pushes up in slag upgrading processes The growing amount of Als is controlled 0.015~0.020%;
(9) during RH vacuum refinings degassing process, vacuum degree≤200Pa, circulation time >=30min, after breaking sky, molten steel is with 30 ~40m3Then flow 15~20min of BOTTOM ARGON BLOWING of/min takes out of machine cast.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101054647A (en) * 2007-05-26 2007-10-17 山西太钢不锈钢股份有限公司 Method of producing low-temperature high-toughness steel and steel plate
CN102443675A (en) * 2011-12-28 2012-05-09 首钢总公司 Production method of low-sulfur steel
CN102747181A (en) * 2011-04-18 2012-10-24 宝山钢铁股份有限公司 Smelting method of 9Ni steel
CN103255258A (en) * 2013-06-11 2013-08-21 鞍钢股份有限公司 Converter smelting method of low-phosphorous and high-alloy steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101054647A (en) * 2007-05-26 2007-10-17 山西太钢不锈钢股份有限公司 Method of producing low-temperature high-toughness steel and steel plate
CN102747181A (en) * 2011-04-18 2012-10-24 宝山钢铁股份有限公司 Smelting method of 9Ni steel
CN102443675A (en) * 2011-12-28 2012-05-09 首钢总公司 Production method of low-sulfur steel
CN103255258A (en) * 2013-06-11 2013-08-21 鞍钢股份有限公司 Converter smelting method of low-phosphorous and high-alloy steel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
鞍钢超低磷钢生产实践;马勇等;《鞍钢技术》;20121031(第5期);第39-40页第2.1节及图2 *

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