CN107234217A - A kind of ar blowing refining method for being used to produce SPHC steel grades - Google Patents

A kind of ar blowing refining method for being used to produce SPHC steel grades Download PDF

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CN107234217A
CN107234217A CN201710576788.4A CN201710576788A CN107234217A CN 107234217 A CN107234217 A CN 107234217A CN 201710576788 A CN201710576788 A CN 201710576788A CN 107234217 A CN107234217 A CN 107234217A
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steel
pipe end
content
filling pipe
argon
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CN107234217B (en
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武光君
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Laiwu Steel Group Yinshan Section Steel Co Ltd
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Shandong Iron and Steel Group Co Ltd SISG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The present invention provides a kind of molten steel purifying method for SPHC steel grades, using continuous casting production Argon filling pipe end brick cup, it is blown into argon gas, air purge is carried out to the molten steel that will enter filling pipe end, promote inclusion floating and removal, and have a number of Argon Bubble along filling pipe end inwall, as steel is flowed into submersed nozzle, form stabilization, continuous annular flow, inhibit middle water containing opening dross problem, add appropriate covering agent for pouring basket in high alkalinity per stove on the pouring basket liquid level of Argon filling pipe end brick cup area just above simultaneously, so that Argon Bubble drives inclusion floating to be absorbed and effectively remove in time by covering agent for pouring basket in high alkalinity to pouring basket liquid level, improve inclusion removal rate, continuous casting intermediate inlet set eye problem is solved using the invention, so that casting sequence reaches more than 30 stoves, so that metallographic the amount of inclusions reduces more than 40% on year-on-year basis in stocking, solve the mass defect of steel inclusion initiation.

Description

A kind of ar blowing refining method for being used to produce SPHC steel grades
Technical field
The present invention relates to a kind of ar blowing refining method for being used to produce SPHC steel grades, belong to Ferrous Metallurgy continuous casting production smelting Gold process technical field.
Background technology
For reduction SPHC production costs, prior art is used adds wash heat material, i.e. slag in converter tapping process with steel stream Technology is washed, the technique on LF refining furnace is straight using Argon, but there is in actual production problems with：(1) Tapping Temperature of Bof It is required that 1680-1700 DEG C, converter lining corrodes weight, it is impossible to bear continuous, production in enormous quantities；(2) pourability of molten steel is poor, Set eye easily occurs for continuous casting intermediate inlet, and casting sequence is low, causes the resistance to material cost of continuous casting high；(3) inclusion content in melting steel is high, by This causes the mass defects such as stocking peeling, and mill bar quality is difficult to ensure that.
CN104531953B (application number 201510019046.3) discloses a kind of refining for being used to produce SPHC steel grades and blown Argon method, the described method comprises the following steps：1) aluminium manganese-ferro deoxidation, temperature control in ladle after tapping are used during converter tapping At 1600-1620 DEG C；2) enter the station logical argon gas of ladle is stirred 2~3 minutes, 0.8~1.2Mpa of argon pressure, by argon gas after stirring Calmness 5-5.5 minutes is closed, argon gas is stirred 1~2 minute under the conditions of argon pressure is 0.8~1.2Mpa after calmness, by argon Controlled atmosphere to sampling after 0.8~1.2Mpa, feed calcium line soft blow；4) continuous casting is carried out after soft blow.The deficiency of the patented technology：Steel Water castability is poor, easily occurs set eye in continuous casting intermediate inlet, and casting sequence is low, it is impossible to produced in enormous quantities.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of ar blowing refining method for being used to produce SPHC steel grades, uses Continuous casting production Argon filling pipe end brick cup, is blown into argon gas, and most of Argon Bubble is upwardly formed the air curtain barrier of annular, to will Molten steel into filling pipe end carries out air purge, promotes inclusion floating and removal, and have a number of Argon Bubble along Shang Shui Intraoral wall, flow into submersed nozzle with steel, form stable, continuous annular flow, not only inhibit tundish Nozzle clogging problem, while adding appropriate height per stove on the pouring basket liquid level of Argon filling pipe end brick cup area just above Basicity tundish covering flux so that Argon Bubble drive inclusion floating to pouring basket liquid level by covering agent for pouring basket in high alkalinity and When absorb and effective removal, improve inclusion removal rate, solving continuous casting intermediate inlet set eye using the invention asks Topic so that casting sequence reaches more than 30 stoves so that metallographic the amount of inclusions reduces more than 40% on year-on-year basis in stocking, solves The mass defect that steel inclusion triggers.
SPHC steel grades, Steel Plate Heat Commercial abbreviation is overall to represent a kind of hot rolled steel plate and steel Band.
A kind of ar blowing refining method for being used to produce SPHC steel grades, it is characterised in that in conticaster casting process, breathe freely Filling pipe end brick cup is blown into argon gas, and every stove adds high alkalinity on the pouring basket liquid level of ventilating filling pipe end brick cup area just above Low-carbon tundish covering flux 20-30kg.
A kind of ar blowing refining method for being used to produce SPHC steel grades, comprises the following steps：
1) desulfurizing iron, sulfur content≤0.015%；
2) aluminum-manganese-iron alloy deoxidation, 3.3~3.5kg of ton steel addition so that dissolved aluminum contains in steel are used during converter tapping Amount 0.02%~0.04%；
3) during converter tapping, special 500~800kg/ of the pre-melted slag stoves of SPHC and 500~800Kg particle stones are added with steel stream Ash/stove, tapping uses slide plate pushing off the slag so that thickness of steel slag≤70mm in ladle, converter terminal control targe：Carbon content >= 0.03%, oxygen content≤800ppm, 1630 DEG C~1650 DEG C of tapping temperature；
4) enter LF refining furnace thermometric and determine oxygen：Enter LF refining furnace, the ladle bottom blowing air brick big argon gas that enters the station is stirred 1~2 minute, 0.8~1.5Mpa of argon pressure, then argon pressure be adjusted to 0.2~0.4Mpa, using hypoxemia probe thermometric determine oxygen；
5) LF refining furnace process operation is controlled：1. aluminium content is controlled, and carries out feeding aluminum steel operation according to aluminium content is measured, aluminium contains Amount control is 0.04%~0.050%；2. slugging is then electrified to, big argon gas is stirred 2~3 minutes；Then the first sub-sampling (letter Claim " sampling 1 "；Samples taken be referred to as " sample 1 ")；3. the composition of sample 1 is determined, while carrying out energization temperature raising；4. entered according to the composition of sample 1 Whether row is with aluminium operation, and big argon gas is stirred 1~2 minute, fine tune temperature；Then (referred to as " sampling 2 ", is sampled the second sub-sampling Product be referred to as " sample 2 ")；5. line feeding calcification, sampling, soft blow, calcium aluminum steel presses 180~200 meters/stove, and refining time is controlled in 18-20 Minute, soft blow time control was at 8~10 minutes；
6) while continuous casting is unwrapped pour greatly, ventilating filling pipe end brick cup is blown into argon gas, initial 5~8L/min of argon flow amount, When molten steel reaches the liquid steel level normally poured into a mould in tundish, argon flow amount is tuned up to 8~12L/min, argon flow amount size Control is advisable with the fluctuation slightly of the liquid steel level of ventilating filling pipe end brick cup area just above；
7) liquid steel level is covered after big water-coating port in the stove of basket pouring first, tundish, the molten steel beam out of tundish Area adds high alkalinity low-carbon tundish covering flux 40-60kg, on the pouring basket liquid level of ventilating filling pipe end brick cup area just above High alkalinity low-carbon tundish covering flux 30-40kg is added, is added portionwise opening to pour in 15min~20min in molten steel beam area 150~200kg high alkalinity low-carbon tundish covering fluxs, follow-up heat adds 80~120kg high alkalinities per stove in molten steel beam area Low-carbon tundish covering flux, per stove, 20~30kg of addition is high-alkali on the liquid steel level of ventilating filling pipe end brick cup area just above Spend low-carbon tundish covering flux；
8) the big bag of continuous casting stops after pouring, and ventilating filling pipe end brick cup stops being blown into argon gas.
Described aluminum-manganese-iron alloy, commercially available prod, trade mark FeMnAl-2.
The special pre-melted slags of described SPHC, Al content is 5%~10%, Al2O3Content is 30%~40%, CaO content 35%~45%, content of MgO is 5%~10%, CaF2Content is 8%~12%, SiO2Content is 3%~7%, other to be miscellaneous Matter.
Described big argon gas stirring, refers to that the pressure that ladle bottom blowing air brick is blown into argon gas is 0.8~1.5Mpa so that steel Liquid steel level is slightly stirred in bag, and the shape of molten steel exposed position is approximate circle, and diameter of a circle is 100~250mm.
Described high alkalinity low-carbon tundish covering flux, is conventional material, is purchased from Shandong Guo Mao metallurgical materials Co., Ltd The high alkalinity low-carbon tundish covering flux of production, product type is DDF-2-9, its basicity (CaO/SiO2) >=6.0, carbon content ≤ 2.0%.
Described purging upper nozzle for continuous casting tundish brick cup is CN CN106041045A (application number 2016106342707) A kind of ventilative ring filling pipe end brick cup of disclosed continuous casting production disperse formula or CN CN106041044A (application numbers A kind of continuous casting production permeable-gas ceramicses pipe filling pipe end brick cup disclosed in 201610634268X).
Described purging upper nozzle for continuous casting tundish brick cup is set on tundish upper nozzle using prior art.
Beneficial effects of the present invention：
1) present invention corrodes lighter, converter can connect in 1630~1670 DEG C of Tapping Temperature of Bof requirement to converter lining Continuous, production in enormous quantities SPHC steel grades, solving existing SPHC steel grades Argon, directly upper tapping temperature requires high technical barrier；
2) present invention is blown into argon gas by being set with ventilating filling pipe end brick cup on continuous casting production filling pipe end, most of Argon Bubble is upwardly formed the air curtain barrier of annular, carries out air purge to the molten steel that will enter filling pipe end, promotes inclusion floating And removal, and have a number of Argon Bubble along filling pipe end inwall, as steel is flowed into submersed nozzle, form steady Fixed, continuous annular flow, not only inhibits middle water containing opening dross problem, and solve the entrance of protectiveness Argon Bubble The strand rimhole problem triggered into steel；
3) present invention adds appropriate high alkalinity on the pouring basket liquid level of ventilating filling pipe end brick cup area just above per stove Low-carbon tundish covering flux, can not only slow down ventilating filling pipe end brick cup Argon initiation liquid level fluctuation of molten steel it is big the problem of, more Prevention secondary oxidation of steel and slag problem are effectively prevented, and Argon Bubble capture inclusion floating is high to liquid steel level Basicity tundish covering flux absorbs and more effectively removal in time.While the tundish of ventilating filling pipe end brick cup area just above The micro, slight fluctuation of liquid level, solves the technical barrier that high alkalinity low-carbon tundish covering flux easily crusts so that continuous casting production again Ventilating filling pipe end brick cup Argon is interacted with high alkalinity low-carbon tundish covering flux, brought out the best in each other, and metallurgical effect is highlighted.
Embodiment
With reference to embodiment, the present invention is further described, but is not limited only to this.Part not in the detailed description of the invention, can be adopted Use prior art.
Embodiment 1：
A kind of ar blowing refining method for being used to produce SPHC steel grades, comprises the following steps：、
1) desulfurizing iron, sulfur content 0.012%；
2) aluminum-manganese-iron alloy deoxidation, addition 3.3kg/t steel are used during converter tapping so that acid-soluble aluminum content is controlled in steel 0.02%；
3) during converter tapping, the special pre-melted slag 500kg/ stoves of SPHC and 800Kg limes are added with steel stream, tapping is used Slide plate pushing off the slag so that thickness of steel slag 60mm in ladle, converter terminal：Carbon content 0.03%, oxygen content 600ppm, tapping temperature 1630℃；
4) enter LF refining furnace thermometric and determine oxygen：Enter LF refining furnace, the ladle bottom blowing air brick big argon gas that enters the station is stirred 2 minutes, argon Atmospheric pressure 0.8Mpa, then argon pressure be adjusted to 0.4Mpa, using hypoxemia probe thermometric determine oxygen；
5) LF refining furnace process operation is controlled：1. aluminium content is controlled, and carries out feeding aluminum steel operation according to aluminium content is measured, aluminium contains Amount control is 0.04%；2. slugging is then electrified to, big argon gas is stirred 2 minutes；Then the first sub-sampling (referred to as " sampling 1 "；Institute Take sample be referred to as " sample 1 ")；3. the composition of sample 1 is determined, while carrying out energization temperature raising；4. it is made whether according to the composition of sample 1 with aluminium behaviour Make, big argon gas is stirred 2 minutes, fine tune temperature；Then the second sub-sampling (referred to as " and sampling 2 ", samples taken be referred to as " sample 2 ")；⑤ Line feeding calcification, sampling, soft blow, calcium aluminum steel press 200 meters/stove, and refining time was controlled at 20 minutes, and soft blow time control is at 10 points Clock；
6) while continuous casting is unwrapped pour greatly, ventilating filling pipe end brick cup is blown into argon gas, initial argon flow amount 5L/min, in treating Between wrap in molten steel when reaching the liquid steel level normally poured into a mould, tune up argon flow amount to 8L/min, argon flow amount size is controlled with saturating The fluctuation slightly of the liquid steel level of gas filling pipe end brick cup area just above is advisable；
7) liquid steel level is covered after big water-coating port in the stove of basket pouring first, tundish, the molten steel beam out of tundish Area adds high alkalinity low-carbon tundish covering flux 60kg, is added on the liquid steel level of ventilating filling pipe end brick cup area just above High alkalinity low-carbon tundish covering flux 40kg, 150kg high alkalinity low-carbons are added portionwise opening to pour in 15min in molten steel beam area Tundish covering flux, follow-up heat adds 80kg high alkalinity low-carbon tundish covering fluxs per stove in molten steel beam area, on ventilative 20kg high alkalinity low-carbon tundish covering fluxs are added on the pouring basket liquid level of pocket block area just above per stove；
8) the big bag of continuous casting stops after pouring, and ventilating filling pipe end brick cup stops being blown into argon gas.
Described aluminum-manganese-iron alloy, commercially available prod, trade mark FeMnAl-2.
The special pre-melted slags of described SPHC, AI contents are 5.2%, Al2O3Content is 36.3%, CaO content 40.74%, Content of MgO is 5.45%, CaF2Content is 8.1%, SiO2Content is 4.03%, and other impurity are 0.18%.
Described big argon gas stirring, refers to that the pressure that ladle bottom blowing air brick is blown into argon gas is 0.8~1.5Mpa so that steel Liquid steel level is slightly stirred in bag, and the shape of molten steel exposed position is approximate circle, and diameter of a circle is 100~250mm.
Described high alkalinity low-carbon tundish covering flux, is conventional material, is purchased from Shandong Guo Mao metallurgical materials Co., Ltd The high alkalinity low-carbon tundish covering flux of production, product type is DDF-2-9, its basicity (CaO/SiO2) >=6.0, carbon content ≤ 2.0%.
Described purging upper nozzle for continuous casting tundish brick cup is CN CN106041045A (application number 2016106342707) A kind of ventilative ring filling pipe end brick cup of disclosed continuous casting production disperse formula
Described purging upper nozzle for continuous casting tundish brick cup is set on tundish upper nozzle using prior art.
Embodiment 2
A kind of molten steel purifying method for SPHC steel grades as described in Example 1, difference is：
A kind of ar blowing refining method for being used to produce SPHC steel grades, comprises the following steps：、
1) desulfurizing iron, sulfur content is 0.010%；
2) aluminum-manganese-iron alloy deoxidation, addition 3.5kg/t steel are used during converter tapping so that acid-soluble aluminum content is controlled in steel 0.04%；
3) during converter tapping, the special pre-melted slag 800kg/ stoves of SPHC and 500Kg limes are added with steel stream, pre-slag, Later stage slag uses slide plate pushing off the slag so that thickness of steel slag is 50mm, converter terminal control targe in ladle：Carbon content 0.04%, Oxygen content is 500ppm, 1650 DEG C of tapping temperature；
4) enter LF refining furnace thermometric and determine oxygen：：Enter LF refining furnace, the ladle bottom blowing air brick big argon gas that enters the station is stirred 1 minute, argon Atmospheric pressure 1.5Mpa, then argon pressure be adjusted to 0.4Mpa, using hypoxemia probe thermometric determine oxygen；
5) LF refining furnace process operation is controlled：1. aluminium content is controlled, and carries out feeding aluminum steel operation according to aluminium content is measured, aluminium contains Amount control is 0.05%；2. slugging is then electrified to, big argon gas is stirred 3 minutes；Then the first sub-sampling (referred to as " sampling 1 "；Institute Take sample be referred to as " sample 1 ")；3. the composition of sample 1 is determined, while carrying out energization temperature raising；4. it is made whether according to the composition of sample 1 with aluminium behaviour Make, big argon gas is stirred 1 minute, fine tune temperature；Then the second sub-sampling (referred to as " and sampling 2 ", samples taken be referred to as " sample 2 ")；⑤ Line feeding calcification, sampling, soft blow, calcium aluminum steel press 180 meters/stove, and refining time was controlled at 18 minutes, and soft blow time control is at 8 points Clock；
6) on continuous casting production filling pipe end be set with ventilating filling pipe end brick cup, while continuous casting is unwrapped pour greatly, breathe freely on Pocket block is blown into argon gas, initial argon flow amount 8L/min, when molten steel reaches the liquid steel level normally poured into a mould in tundish, Argon flow amount is tuned up to 12L/min, the control of argon flow amount size is micro- with the liquid steel level of ventilating filling pipe end brick cup area just above Microwave is dynamic to be advisable；
7) liquid steel level is covered after big water-coating port in the stove of basket pouring first, tundish, the molten steel beam out of tundish Area adds high alkalinity low-carbon tundish covering flux 40kg, is added on the liquid steel level of ventilating filling pipe end brick cup area just above High alkalinity low-carbon tundish covering flux 30kg, 200kg high alkalinity low-carbons are added portionwise opening to pour in 20min in molten steel beam area Tundish covering flux, follow-up heat adds 80kg high alkalinity low-carbon tundish covering fluxs per stove in molten steel beam area, on ventilative 30kg high alkalinity low-carbon tundish covering fluxs are added on the pouring basket liquid level of pocket block area just above per stove；
8) the big bag of continuous casting stops after pouring, and ventilating filling pipe end brick cup stops being blown into argon gas.
Described purging upper nozzle for continuous casting tundish brick cup is CN CN106041044A (application number 201610634268X) A kind of disclosed continuous casting production permeable-gas ceramicses pipe filling pipe end brick cup.
Comparative example 1：CN104531953B (application number 201510019046.3) discloses a kind of for producing SPHC steel grades Refining argon jetting method,
By embodiment 1-2 and comparative example 1, in the 2# slab casters cast life of Laiwu steel enterprise Yin Shan shaped steel Co., Ltd SPHC steel grades are produced, using the present invention, the LF refining time reduces 10~15 minutes on year-on-year basis, and the submersed nozzle life-span improves 1 on year-on-year basis Times, single continuous cast crystallizer number improves 2 times on year-on-year basis, reaches more than 30 stoves, metallographic the amount of inclusions subtracts on year-on-year basis than comparative example 1 in stocking Few more than 40%.Comparing result is shown in Table 1.
Table 1

Claims (5)

1. a kind of be used to produce the ar blowing refining methods of SPHC steel grades, it is characterised in that in conticaster casting process, breathe freely on Pocket block is blown into argon gas, while adding high alkalinity on the pouring basket liquid level of ventilating filling pipe end brick cup area just above per stove Low-carbon tundish covering flux.
2. the ar blowing refining method as claimed in claim 1 for being used to produce SPHC steel grades, comprises the following steps：
1) desulfurizing iron, sulfur content≤0.015%；
2) aluminum-manganese-iron alloy deoxidation, 3.3~3.5kg of ton steel addition so that acid-soluble aluminum content in steel are used during converter tapping 0.02%~0.04%；
3) during converter tapping, with steel stream add special 500~800kg/ of the pre-melted slag stoves of SPHC and 500~800Kg limes/ Stove, tapping uses slide plate pushing off the slag so that thickness of steel slag≤70mm in ladle, converter terminal control targe：Carbon content >=0.03%, Oxygen content≤800ppm, 1630 DEG C~1650 DEG C of tapping temperature；
4) enter LF refining furnace thermometric and determine oxygen：Enter LF refining furnace, the ladle bottom blowing air brick big argon gas that enters the station is stirred 1~2 minute, argon gas 0.8~1.5Mpa of pressure, then argon pressure be adjusted to 0.2~0.4Mpa, using hypoxemia probe thermometric determine oxygen；
5) LF refining furnace process operation is controlled：1. aluminium content is controlled, and carries out feeding aluminum steel operation, aluminium content control according to aluminium content is measured System is 0.04%~0.050%；2. slugging is then electrified to, big argon gas is stirred 2~3 minutes；Then the first sub-sampling (referred to as " takes Sample 1 "；Samples taken be referred to as " sample 1 ")；3. the composition of sample 1 is determined, while carrying out energization temperature raising；4. it is made whether according to the composition of sample 1 With aluminium operation, big argon gas is stirred 1~2 minute, fine tune temperature；Then (referred to as " sampling 2 ", samples taken is referred to as the second sub-sampling " sample 2 ")；5. line feeding calcification, sampling, soft blow, calcium aluminum steel presses 180~200 meters/stove, and refining time was controlled at 18-20 minutes, soft Time control is blown at 8~10 minutes；
6) while continuous casting is unwrapped pour greatly, ventilating filling pipe end brick cup is blown into argon gas, initial 5~8L/min of argon flow amount, in treating Between wrap in molten steel when reaching the liquid steel level normally poured into a mould, tune up argon flow amount to 8~12L/min, the control of argon flow amount size It is advisable with the fluctuation slightly of the liquid steel level of ventilating filling pipe end brick cup area just above；
7) liquid steel level is covered after big water-coating port in the stove of basket pouring first, tundish, and molten steel beam area adds out of tundish Enter high alkalinity low-carbon tundish covering flux 40-60kg, added on the liquid steel level of ventilating filling pipe end brick cup area just above high Basicity low-carbon tundish covering flux 30-40kg, open pour in 15min~20min be added portionwise 150 in molten steel beam area~ 200kg high alkalinity low-carbon tundish covering fluxs, follow-up heat is per stove in molten steel beam area addition 80~120kg high alkalinity low-carbons Between covering agent, on the pouring basket liquid level of ventilating filling pipe end brick cup area just above per stove add 20~30kg high alkalinity low-carbons Tundish covering flux；
8) the big bag of continuous casting stops after pouring, and ventilating filling pipe end brick cup stops being blown into argon gas.
3. the ar blowing refining method as claimed in claim 1 for being used to produce SPHC steel grades, it is characterised in that
The special pre-melted slags of described SPHC, Al content is 5%~10%, Al2O3Content is 30%~40%, CaO content 35%~ 45%, content of MgO is 5%~10%, CaF2Content is 8%~12%, SiO2Content is 3%~7%, and other is impurity.
4. the ar blowing refining method as claimed in claim 1 for being used to produce SPHC steel grades, it is characterised in that described big argon gas Stirring, refers to that the pressure that ladle bottom blowing air brick is blown into argon gas is 0.8~1.5Mpa so that liquid steel level is slightly turned in ladle Dynamic, the shape of molten steel exposed position is approximate circle, and diameter of a circle is 100~250mm.
5. it is used for the molten steel purifying method of SPHC steel grades as claimed in claim 1, it is characterised in that described continuous casting production Ventilating filling pipe end brick cup is set on tundish upper nozzle.
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Cited By (8)

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CN108500252A (en) * 2018-04-09 2018-09-07 东北大学 A kind of tundish bottom with cover is breathed freely ring and its method that controls tundish slag
CN109722500A (en) * 2019-02-28 2019-05-07 山东钢铁股份有限公司 A kind of node control method for LF refining furnace processing carbon aluminium-killed steel molten steel
CN110564916A (en) * 2019-09-24 2019-12-13 山东钢铁股份有限公司 Method for shortening refining time of SPHC steel grade
CN111001768A (en) * 2019-12-12 2020-04-14 首钢京唐钢铁联合有限责任公司 Deoxidizing type covering agent and using method thereof
CN112760454A (en) * 2020-12-23 2021-05-07 二重（德阳）重型装备有限公司 Purification method for molten steel of die casting tundish
CN115161431A (en) * 2022-07-22 2022-10-11 北京科技大学 Steel ladle wire feeding process protected by double-layer air curtain
CN115198057A (en) * 2022-06-16 2022-10-18 山东钢铁股份有限公司 Molten steel refining method of steel for ocean platform below EH36
CN115647313A (en) * 2022-11-14 2023-01-31 鞍钢股份有限公司 Steel ladle covering agent suitable for straightening SPHC steel grade and using method

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CN110564916B (en) * 2019-09-24 2021-07-09 山东钢铁股份有限公司 Method for shortening refining time of SPHC steel grade
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CN115647313A (en) * 2022-11-14 2023-01-31 鞍钢股份有限公司 Steel ladle covering agent suitable for straightening SPHC steel grade and using method
CN115647313B (en) * 2022-11-14 2023-08-18 鞍钢股份有限公司 Ladle covering agent suitable for SPHC steel grade straight up and use method

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