CN105986055A - Multi-pot molten steel continuous casting method for ultra-low phosphorous-suplhur high-alloy steel in single LF furnace - Google Patents
Multi-pot molten steel continuous casting method for ultra-low phosphorous-suplhur high-alloy steel in single LF furnace Download PDFInfo
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- CN105986055A CN105986055A CN201510090405.3A CN201510090405A CN105986055A CN 105986055 A CN105986055 A CN 105986055A CN 201510090405 A CN201510090405 A CN 201510090405A CN 105986055 A CN105986055 A CN 105986055A
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Abstract
The invention provides a multi-pot molten steel continuous casting method for ultra-low phosphorous-suplhur high-alloy steel in a single LF furnace. According to the multi-pot molten steel continuous casting method, for the ultra-low phosphorous-suplhur high-alloy steel with less than 0.005% of phosphorous and less than 0.002% of suplhur, the phosphorous content during tapping and the tapping temperature are controlled by optimization of a converter process; by adoption of a rephosphorization control technology, the amount of molten steel pots and RH vacuum rephosphorization are reduced, a molten steel slagging-off process is cancelled, the LF processing period is shortened, the phosphorous content in tapping is controlled to be 10-20ppm, rephosphorization is controlled within 15ppm, and the phosphorous content of a finished product is controlled within 35ppm; the LF processing period is shortened from original 150min to 70min to be matched with the casting time of a casting machine, and the number of pots being continuously casted is increased from original 1-2 to 6 or even more; and meanwhile, the quantity of iron and steel materials can be lowered by 52kg/t steel, the cost of the iron and steel materials is saved by 520 yuan per ton of steel, and the processing cost can be saved by 200 yuan per ton of steel.
Description
Technical field
The invention belongs to process for making field.Particularly relate to the pole low phosphor and sulfur high-alloy steel of a kind of phosphorus ＜ 0.005%, sulfur ＜ 0.002%
Method is watered by the company of single LF stove multiple tank molten steel.
Background technology
Extremely low phosphorus, sulfur high-alloy steel, such as ultralow temperature pressure vessel steel 9Ni, it is desirable to its composition: nickel 9%, phosphorus content is less than 0.005%,
Sulfur content is less than 0.002%, and for this type of steel grade, the way of Anshan iron and steel plant is: smelting process uses low-temperature operation, smelting endpoint temperature
Being not more than 1550 DEG C, tapping phosphorus composition controls at about 20ppm, conforms to quality requirements for controlling finished product phosphorus content, uses tapping
Pushing off the slag+molten steel slag skimming process controls rephosphorization of molten steel.After taking this technique, LF process is forced to be divided into two steps: 1) entering the station first rises
Temperature, but do not carry out steel slag modification, prevents rephosphorization after modification, 2) carry out molten steel after heating up to skim；3) reducing slag desulfurization is made.
The process cycle of above-mentioned LF is the longest, does not mates the duration of pouring with casting machine.Therefore can only individually pour into a mould by a tank, most realities
Show 2 tanks even to water.Nangang uses converter repeatedly deslagging method to control tapping phosphorus at 30ppm, and what method below and Anshan iron and steel plant used arranges
Execute identical.Taiyuan Iron and Steel Co. converter is blown by normal smelting mode, first de-P agent is added in ladle, utilize converter tapping mistake before tapping
Journey is dephosphorization in ladle, and molten steel takes off after P skims, and the method deeply taking off S at LF produces 9Ni steel.Anshan iron and steel plant and Nangang's LF refine need
Wanting time average is 150min, and Taiyuan Iron and Steel Co. LF stove processes the time more than 150min.These traditional methods, are primarily due at molten steel
The reason time is long, and molten steel is seriously polluted, steel grade degradation.Secondly as singly water time tank number very little, waste products is more, various
High material consumption, ton steel production cost is the highest.
Summary of the invention
The present invention provides a kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tank molten steel even to water method, its objective is by optimizing converter work
Skill, controls tapping phosphorus content and tapping temperature, takes zeroing fault technology, thus reduce ladle, RH vacuum rephosphorization, cancels
Molten steel slag skimming process, shortens LF and processes the cycle, it is achieved more than 6 tanks and 6 tanks connect and water, reduce ton steel production cost.
To this end, the solution that the present invention is taked is:
A kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tank molten steel even waters method, it is characterised in that for phosphorus ＜ 0.005%, sulfur ＜
Single LF stove multiple tank molten steel of the pole low phosphor and sulfur high-alloy steel of 0.002% even method of watering is:
(1), before producing, first arrange one to water time low silicon aluminium killed steel, control converter tapping P≤0.015%, RH vacuum tube is entered
Row rinses pipe more than 2 times；
(2) ladle uses low silicon aluminium killed steel to carry out rinsing tank more than 2 times, controls ladle rephosphorization；
(3) according to dephosphorization stove chemistry blow loss 2.7%, physics blow loss 2.1%, dephosphorization stove target charge weight is: decarbonizing furnace charge weight/
(1-4.8%) ± 2 tons；
(4) requiring molten iron Si 0.2～0.6%, temperature 1280～1400 DEG C, steel scrap is frivolous pure steel scrap, and scrap ratio is 80kg/
Ton ferrum；Loading sequence is for first adding hot metal charging after steel scrap；
(5) controlling sulfur≤0.0010% after molten iron pre-desulfurization, skim thoroughly, molten iron face does not has in bulk accumulated slag；
(6) converter uses duplex method to smelt, and for dephosphorization stove, desiliconizing and dephosphorizing phase, top gun oxygen blast intensity settings is normal blowing
The 90% of intensity, bottom blowing flow set is maximum stream flow；Open after blowing add activity white lime 12～16kg/ ton steel, light dolomite 4～
8kg/ ton steel, Ore adds the 2/3 of total amount according to thermal balance, and blowing 4～5min, blunderbuss slagging when slag enlivens, by furnace interior
High phosphorus slag is divided to bleed off；Then proceed to lower rifle blowing, slag making again, add activity white lime 14～18kg/ ton steel, light dolomite 2～
4kg/ ton steel and remaining Ore；Meanwhile, the half steel i.e. dephosphorization stove tapping temperature when blowing is to 8.8～9min before converter is controlled
Degree is 1400～1450 DEG C, carbon content 2.00～2.30% of tapping, and dephosphorization stove tapping phosphorus is below 0.025%；
(7) adding temperature raising carburant 11～13kg/ ton steel before decarbonizing furnace is opened and blown, top gun oxygen blast intensity is normal oxygen blast intensity,
Bottom blowing flow set is maximum stream flow；Open and after blowing, add activity white lime 39～41kg/ ton steel, light dolomite 8～10kg/ ton steel
And 3.5～4.5kg/ slagging agents of ton steel；Aim carbon controls 0.03～0.05%, and tapping temperature controls 1600～1620
DEG C, hanging pot temperature controls more than 1580 DEG C；
(8) tapping hole plug brick is confirmed whether that before tapping plug firmly, fills in one outside tapping hole former plug brick again, before avoiding tapping
The slag of phase enters in ladle, and latter stage with pushing off the slag mark pushing off the slag, forbids slag；
(9) LF refining furnace is in desulfurization processing procedure, and slag making materials does not allows to add carbide and fluxing slag；Steel ladle bottom argon blowing flow
The most acutely seething as standard with molten steel face, in the slag upgrading processes of control top, the growing amount of Als is 0.015～0.020%；
(10) in RH vacuum refining degassing processing procedure, vacuum≤200Pa, circulation time >=30min, after broken sky, steel
Water low discharge BOTTOM ARGON BLOWING 15～20min, then takes out of machine cast.
The positive role of the present invention and having the beneficial effect that
1, decarbonizing furnace enters stove molten iron phosphorus content less than 0.025%, reduces P in decarburization slag2O5Content, adds carburant temperature raising
Material, it is ensured that converter terminal carbon, reduces the extent of peroxidation of molten steel, is conducive to controlling tapping process slag rephosphorization.
2, improve converter and take out of temperature, cancel molten steel slag skimming process, make LF rise gentleness modification desulfurization and carry out simultaneously, shorten LF
In the process cycle, it is allowed to match with casting machine casting cycle, it is achieved more than 6 tanks even 6 tank connect and water.
3, even water technology owing to achieving multiple tank, greatly saved process energy consumption, released steel-making production capacity, eliminate because of life
Produce extremely low phosphorus, the adverse effect of the serious foundary weight of sulfur high-alloy steel.
The refractory consumptions such as 4, the cast of reason 1-2 tank brings up to more than 6 tanks even 6 tank and connects and water, and decreases waste products loss, middle bag
Also substantially reduce, thus effectively reduce the smelting cost of this type of steel grade.
5, comparing traditional handicraft because of converter tapping hanging pot temperature and improve more than 30 DEG C, the LF heating-up time shortens more than half, reduces
Molten steel is mingled with the quantity of generation, improves the quality of molten steel.
Therefore, the present invention can by tapping phosphorus content control 10～20ppm, zeroing fault within 15ppm, finished product phosphorus content
Control within 35ppm.The LF process cycle is foreshortened to 70min by original 150min, it is achieved match the duration of pouring with casting machine,
Even water tank number to be improved more than 6 tanks even 6 tank by 1～2 tanks；Meanwhile, the present invention can reduce iron and steel stock 52kg/t steel, ton steel
Cost-effective 520 yuan of iron and steel stock, processing charges can save 200 yuan/ton of steel.
Detailed description of the invention
Pole of the present invention low phosphor and sulfur high-alloy steel list LF stove multiple tank molten steel even waters method, mainly by optimizing converter process, controls
Steel phosphorus content and tapping temperature, take zeroing fault technology, reduces ladle, RH vacuum rephosphorization, cancels molten steel slag skimming process,
Shorten LF and process the cycle, it is achieved more than 6 tanks and 6 tanks connect and water, reduce ton steel production cost.
Below as a example by 260 tons of top and bottom combined blown converter smelting ultralow temperature pressure vessel steel 9Ni, the invention will be further described.
Embodiment 1:
1, before 9Ni steel produces, first arrange one to water time SPHC steel, control converter tapping P≤0.015%, and RH vacuum tube is entered
Row rinses pipe 3 times, to reduce RH processing procedure rephosphorization amount.
2, ladle uses low silicon aluminium killed steel to carry out rinsing tank 4 times, controls ladle rephosphorization.
3, being 2.7% according to dephosphorization stove chemistry blow loss, physics blow loss is 2.1%, decarbonizing furnace target charge weight 265 tons: then dephosphorization
Stove charge weight is 278 ± 2 tons.
4, molten iron Si 0.4%, temperature 1350 DEG C, frivolous pure steel scrap 21.6 tons；According to dephosphorization stove target charge weight 278 ± 2
Ton: controlling to be blended into molten iron 258 tons, loading sequence, for first to add hot metal charging after steel scrap, prevents steel scrap from gluing big face.
5, sulfur content 0.0010% after molten iron pre-desulfurization, skims thoroughly, and molten iron face does not has in bulk accumulated slag.
6, converter uses duplex method to smelt.For dephosphorization stove, desiliconizing and dephosphorizing phase, top gun oxygen blast intensity settings is that normal blowing is strong
90% i.e. 48000m of degree3/ h, bottom blowing flow set is maximum 26Nm3/h.Open and after blowing, add activity white lime 3500kg, light-burned
Dolomite 1500kg, Ore adds the 2/3 of total amount according to thermal balance, and blow 4min, and blunderbuss slagging when slag enlivens, by stove
The high phosphorus slag of part bleeds off.Then proceed to the blowing of lower rifle, add activity white lime 4000kg, light dolomite 500kg, and residue
Ore slag making again.Blowing is to blunderbuss tapping during 8.8min, tapping temperature 1440 DEG C, tapping carbon content 2.10%, phosphorus of tapping
Content 0.018%.
7, open blow before add carburant 3500kg, top gun oxygen blast intensity is 53700m3/ h, bottom blowing flow set is 26Nm3/h。
Open and after blowing, add activity white lime 11000kg, light dolomite 2000kg, and the slagging agent of 1000kg；When converter smelting two
Blunderbuss when level automatic control system display endpoint carbon content is in the range of 0.03-0.05%, endpoint carbon content 0.05%, temperature 1618
℃。
8, using double plug brick technology, tapping hole plug brick is confirmed whether that before tapping plug firmly, fills in one outside tapping hole former plug brick again,
Entering in ladle with the slag of early stage of avoiding tapping, latter stage with pushing off the slag mark pushing off the slag, forbids slag.Hanging pot temperature 1593 after Converter
℃。
9, LF refining furnace is in desulfurization processing procedure, and slag making materials does not allows to add carbide and fluxing slag；Steel ladle bottom argon blowing flow with
Molten steel face is the most acutely seethed as standard, and after the slag modification of top, Als is 0.018%.
10, in RH vacuum refining degassing processing procedure, vacuum≤200Pa, circulation time 30min, after broken sky, molten steel is little
Flow BOTTOM ARGON BLOWING 16min, then takes out of machine cast.
Embodiment 2:
1, before 9Ni steel produces, first arrange one to water time SPHC steel, control converter tapping P≤0.015%, and RH vacuum tube is entered
Row rinses pipe 5 times, to reduce RH processing procedure rephosphorization amount.
2, ladle uses low silicon aluminium killed steel to carry out rinsing tank 4 times, controls ladle rephosphorization.
3, being 2.7% according to dephosphorization stove chemistry blow loss, physics blow loss is 2.1%, decarbonizing furnace target charge weight 265 tons: then dephosphorization
Stove charge weight is 278 ± 2 tons.
4, molten iron Si 0.5%, temperature 1300 DEG C, frivolous pure steel scrap 20.4 tons；According to dephosphorization stove target charge weight 278 ± 2
Ton: controlling to be blended into molten iron 258 tons, loading sequence, for first to add hot metal charging after steel scrap, prevents steel scrap from gluing big face.
5, sulfur content 0.0008% after molten iron pre-desulfurization, skims thoroughly, and molten iron face does not has in bulk accumulated slag.
6, converter uses duplex method to smelt.For dephosphorization stove, desiliconizing and dephosphorizing phase, top gun oxygen blast intensity settings is that normal blowing is strong
90% i.e. 48000m of degree3/ h, bottom blowing flow set is maximum 26Nm3/h.Open and after blowing, add activity white lime 3800kg, light-burned
Dolomite 1300kg, Ore adds the 2/3 of total amount according to thermal balance, and blow 4.5min, and blunderbuss slagging when slag enlivens, by stove
Interior part high phosphorus slag bleeds off.Then proceed to the blowing of lower rifle, add activity white lime 3650kg, light dolomite 900kg, and surplus
Remaining Ore slag making again.Blowing is to blunderbuss tapping during 9min, tapping temperature 1420 DEG C, tapping carbon content 2.15%, phosphorus of tapping
Content 0.021%.
7, adding carburant 3200kg before decarbonizing furnace is opened and blown, top gun oxygen blast intensity is 53700m3/ h, bottom blowing flow set is
26Nm3/h.Open and after blowing, add activity white lime 10400kg, light dolomite 2500kg, and the slagging agent of 920kg；Work as converter
Blunderbuss when the two grades of automatic control system display endpoint carbon contents smelted are in the range of 0.03-0.05%, endpoint carbon content 0.035%,
Temperature 1610 DEG C.
8, using double plug brick technology, tapping hole plug brick is confirmed whether that before tapping plug firmly, fills in one outside tapping hole former plug brick again,
Entering in ladle with the slag of early stage of avoiding tapping, latter stage with pushing off the slag mark pushing off the slag, forbids slag, and after Converter, hanging pot temperature exists
1598℃。
9, LF refining furnace is in desulfurization processing procedure, and slag making materials does not allows to add carbide and fluxing slag；Steel ladle bottom argon blowing flow with
Molten steel face is the most acutely seethed as standard, and after the slag modification of top, Als is 0.016%.
10, in RH vacuum refining degassing processing procedure, vacuum≤200Pa, circulation time 37min, after broken sky, molten steel is little
Flow BOTTOM ARGON BLOWING 18min, then takes out of machine cast.
Claims (1)
1. a pole low phosphor and sulfur high-alloy steel list LF stove multiple tank molten steel even waters method, it is characterised in that for phosphorus ＜ 0.005%,
Single LF stove multiple tank molten steel of the pole low phosphor and sulfur high-alloy steel of sulfur ＜ 0.002% even method of watering is:
(1), before producing, first arrange one to water time low silicon aluminium killed steel, control converter tapping P≤0.015%, RH vacuum tube is entered
Row rinses pipe more than 2 times；
(2) ladle uses low silicon aluminium killed steel to carry out rinsing tank more than 2 times, controls ladle rephosphorization；
(3) according to dephosphorization stove chemistry blow loss 2.7%, physics blow loss 2.1%, dephosphorization stove target charge weight is: decarbonizing furnace charge weight/
(1-4.8%) ± 2 tons；
(4) requiring molten iron Si 0.2～0.6%, temperature 1280～1400 DEG C, steel scrap is frivolous pure steel scrap, and scrap ratio is 80kg/
Ton ferrum；Loading sequence is for first adding hot metal charging after steel scrap；
(5) controlling sulfur≤0.0010% after molten iron pre-desulfurization, skim thoroughly, molten iron face does not has in bulk accumulated slag；
(6) converter uses duplex method to smelt, and for dephosphorization stove, desiliconizing and dephosphorizing phase, top gun oxygen blast intensity settings is normal blowing
The 90% of intensity, bottom blowing flow set is maximum stream flow；Open after blowing add activity white lime 12～16kg/ ton steel, light dolomite 4～
8kg/ ton steel, Ore adds the 2/3 of total amount according to thermal balance, and blowing 4～5min, blunderbuss slagging when slag enlivens, by furnace interior
High phosphorus slag is divided to bleed off；Then proceed to lower rifle blowing, slag making again, add activity white lime 14～18kg/ ton steel, light dolomite 2～
4kg/ ton steel and remaining Ore；Meanwhile, the half steel i.e. dephosphorization stove tapping temperature when blowing is to 8.8～9min before converter is controlled
Degree is 1400～1450 DEG C, carbon content 2.00～2.30% of tapping, and dephosphorization stove tapping phosphorus is below 0.025%；
(7) adding temperature raising carburant 11～13kg/ ton steel before decarbonizing furnace is opened and blown, top gun oxygen blast intensity is normal oxygen blast intensity,
Bottom blowing flow set is maximum stream flow；Open and after blowing, add activity white lime 39～41kg/ ton steel, light dolomite 8～10kg/ ton steel
And 3.5～4.5kg/ slagging agents of ton steel；Aim carbon controls 0.03～0.05%, and tapping temperature controls 1600～1620
DEG C, hanging pot temperature controls more than 1580 DEG C；
(8) tapping hole plug brick is confirmed whether that before tapping plug firmly, fills in one outside tapping hole former plug brick again, before avoiding tapping
The slag of phase enters in ladle, and latter stage with pushing off the slag mark pushing off the slag, forbids slag；
(9) LF refining furnace is in desulfurization processing procedure, and slag making materials does not allows to add carbide and fluxing slag；Steel ladle bottom argon blowing flow
The most acutely seething as standard with molten steel face, in the slag upgrading processes of control top, the growing amount of Als is 0.015～0.020%；
(10) in RH vacuum refining degassing processing procedure, vacuum≤200Pa, circulation time >=30min, after broken sky, steel
Water low discharge BOTTOM ARGON BLOWING 15～20min, then takes out of machine cast.
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| CN201510090405.3A CN105986055A (en) | 2015-02-25 | 2015-02-25 | Multi-pot molten steel continuous casting method for ultra-low phosphorous-suplhur high-alloy steel in single LF furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355452A (en) * | 2018-10-19 | 2019-02-19 | 邯郸钢铁集团有限责任公司 | A kind of smelting process of high phosphorus hot metal |
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