CN110284049A - A kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence - Google Patents

A kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence Download PDF

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CN110284049A
CN110284049A CN201910695953.7A CN201910695953A CN110284049A CN 110284049 A CN110284049 A CN 110284049A CN 201910695953 A CN201910695953 A CN 201910695953A CN 110284049 A CN110284049 A CN 110284049A
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deep
cold rolling
steel
ultra
added
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CN110284049B (en
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李应江
邓勇
胡晓光
李宝庆
张宜
谢大为
夏序河
王欢
熊华报
张正群
张雷
杨明
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Maanshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/068—Decarburising
    • 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
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper

Abstract

The invention discloses the secondary refining methods that a kind of raising ultra-deep rushes cold rolling glassed steel casting sequence, by molten iron and scrap smelting at first steel-making water；First step modification is carried out to ladle top slag in the technique of alloy fine tuning station；Decarburization and nitrogen pick-up are carried out after RH molten steel circulation, it carries out determining oxygen when decarburization starts, aluminum shot is added after decarburization and carries out deoxidation and alloying, ladle top slag modifier is added after the broken sky of RH and carries out secondary modification, using method of the invention, ultra-deep rush cold rolling glassed steel casting sequence by pervious 3 furnace even pour raising to 5 furnaces even pour, increase rate 66.7%, it realizes ultra-deep and rushes the batch of cold rolling glassed steel, efficient, steady production, there is significant economic benefit.

Description

A kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence
Technical field
The invention belongs to steelmaking technical fields, and in particular to a kind of raising ultra-deep is rushed outside the furnace of cold rolling glassed steel casting sequence Method of refining.
Background technique
Enamel product is usually that bottom embryo is made in steel plate after punch process shapes, and then carries out porcelain on the surface of bottom embryo It the glaze application of slip and is sintered.Ultra-deep rushes cold rolling glassed steel and has both excellent punching performance and fish scaling resistance, and it is multiple to be able to satisfy shape Needs miscellaneous, punching press difficulty is big, the demanding enamelware of enamel quality produces, composition characteristic are Ultra-low carbon, high-sulfur, height Nitrogen, Gao Tai, with the progress of smelting technique, Composition Control is no longer the difficult point for restricting ultra-deep and rushing cold rolling glassed steel.And according to Metallurgy principle, this steel grade continuous casting steel castability is poor, and casting process easily generates storage stream and makes production disruption, seriously restricts steel mill Production capacity release and improving productivity.To avoid production abnormal interrupt, general steel mill, which is all made of, small pours time group (no more than 4 furnaces) It produces.For steel mill, continuous casting working procedure casting sequence is low to have become the limitation for restricting deep-draw cold rolling glassed steel production efficiency and cost Property link, need carry out technological innovation and solve.
Summary of the invention
It produces the ultra-deep containing aluminium, titanium and rushes cold rolling glassed steel casting process to solve current main-stream steel mill and easily store stream, even pour furnace The low problem of number, the present invention provides the secondary refining method that a kind of raising ultra-deep rushes cold rolling glassed steel casting sequence, this method Continuous casting casting sequence can be greatly improved, realizes that ultra-deep rushes the batch of cold rolling glassed steel, efficient, steady production.
Technical solution provided by the invention are as follows:
A kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence, the described method comprises the following steps:
(1) converter smelting: by molten iron and scrap smelting at first steel-making water；
(2) first step modification alloy fine tuning station: is carried out to ladle top slag；
(3) RH vacuum refining furnace: decarburization and nitrogen pick-up are carried out after RH molten steel circulation, carries out determining oxygen, decarburization knot when decarburization starts Aluminum shot is added after beam and carries out deoxidation and alloying, ladle top slag modifier is added after the broken sky of RH and carries out secondary modification.
Further, in the step (1), control converter smelting tapping temperature is 1680-1700 DEG C, during converter tapping Lime is added, during lime is added, opens steel ladle bottom argon blowing and closes BOTTOM ARGON BLOWING after lime fusing；Control room turns during converter tapping The lower quantity of slag of furnace.
Further, in the step (1), the additional amount of lime is 2-5kg/ tons of steel；Argon flow is set as 100- 400Nm3/ hour；The quantity of slag is not greater than 4.5kg/ tons of steel under converter.
In the step (2), the requirement of first step modification ladle top slag modifier used are as follows: metallic aluminium (MAl) >=45.0%, SiO2≤ 8.0%, H2O≤8.0%；Granularity: 5-28mm > 85%, > 30mm≤5%；The ladle top slag modification The additional amount of agent is 1-3kg/ tons of steel.
In the step (2), ladle top slag modifier is added by distributing device, does not during which open steel ladle bottom argon blowing.
In the step (3), decarburization and nitrogen pick-up, the condition of the nitrogen pick-up are as follows: during decarburization, propose are carried out after RH molten steel circulation Rising gas is nitrogen, and nitrogen flow is set as 170-190Nm3/ hour, retention time under the conditions of vacuum level requirements≤2.6mbar >=10 minutes；
It in the step (3), carries out determining oxygen when decarburization starts, if carbon content of molten steel+150ppm≤Oxygen Content in Liquid Steel≤steel When water carbon content+300ppm, carbon-oxygen matching, using nature decarburization；If when Oxygen Content in Liquid Steel < carbon content of molten steel+150ppm, carbon Hyperoxia is low, using RH top gun oxygen blast；If when Oxygen Content in Liquid Steel > carbon content of molten steel+300ppm, carbon hypoxemia is high, add carburant pre- de- Oxygen, the purpose is to control decarburization to terminate molten steel activity oxygen in 150-300ppm.
In the step (3), progress nitrogen pick-up in 6 minutes after deoxidation aluminum shot is added to addition, the condition of the nitrogen pick-up are as follows: promoted Gas is nitrogen, and nitrogen flow is set as 180-200Nm3/ hour, vacuum degree are set as 50-100mbar.
In the step (3), after deoxidation aluminum shot is added 6 minutes, sulphur iron, electrolytic manganese, ferrotianium, copper sheet is added, molten steel is carried out Alloying is synchronized to molten steel nitrogen pick-up；Molten steel recycles 18-24 minutes after sulphur iron, electrolytic manganese, ferrotianium, copper sheet are added；The nitrogen pick-up Condition are as follows: lift gas is nitrogen, and nitrogen flow is set as 180-200Nm3/ hour, vacuum degree are set as 50-100mbar.
In the step (3), the ladle top slag modifier requirement of secondary modification is carried out are as follows: MAl >=45.0%, CaO >= 45.0%, SiO2≤ 8.0%, H2O≤0.5%, granularity: 5-28mm > 85%, > 30mm≤5%；Ladle top slag modifier is added Amount is adjusted according to RH blowing oxygen quantity: when RH blowing oxygen quantity is 0, adding 150-200kg；RH blowing oxygen quantity 0-100Nm3When, add 200-300kg； RH blowing oxygen quantity 101-200Nm3When, add 300-400kg, RH blowing oxygen quantity >=201Nm3When, add 400-500kg.
Further, the secondary refining method of cold rolling glassed steel casting sequence is rushed using raising ultra-deep of the present invention The ultra-deep rushes the chemical component that cold rolling glassed steel includes following weight percent: carbon≤0.005%, silicon≤0.030%, manganese 0.05-0.35%, phosphorus≤0.020%, sulphur 0.015-0.035%, dissolved aluminum 0.015-0.050%, titanium 0.070-0.10%, nitrogen 0.0050-0.0100%, copper 0.02-0.04%, surplus are iron and inevitable impurity.
The present invention provides a kind of preparation methods of superb deep-draw cold rolling glassed steel, including converter smelting → alloy fine tuning station → RH vacuum refining furnace → sheet billet continuous casting technique, the converter smelting, alloy fine tuning station, RH vacuum refining furnace step are according to above-mentioned Method carries out.
Steel is added after addition lime, alloy fine tuning station and the broken sky of RH during the quantity of slag, tapping under converter by controlling in the present invention The measures such as packet top slag modifier reduce slag beneficiation, secondary oxidation during casting are reduced, to reduce field trash Al2O3It generates Amount.Ladle top slag has carried out primary modification due to finely tuning station process in alloy in the present invention, and slag beneficiation is lower, and RH decarburization Oxygen Content in Liquid Steel height in the process, oxygen cause RH process phase ladle oxidisability to enhance from molten steel to top slag transmitting, therefore after the broken sky of RH Secondary modification is carried out to ladle top slag；
It is tapped by converter high temperature to prevent RH chemical heating, RH control decarburization terminated oxygen content in 150-300ppm, both Meet molten steel decarburization needs, and utmostly reduces deoxidation products Al2O3Production quantity；Meanwhile passing through the promotion after raising RH deoxidation Gas flow promotes field trash to exclude, and improves Cleanliness of Molten Steel so as to improve molten steel castability.
By the above secondary refining method of the present invention for improving ultra-deep and rushing cold rolling glassed steel casting sequence, not only may be used Accurately to control nitrogen content and continuous casting casting sequence greatly improved, realize ultra-deep rush cold rolling glassed steel batch, efficiently, Steady production.
Using method of the invention, ultra-deep rushes cold rolling glassed steel casting sequence and even pours raising by pervious 3 furnace to 5 furnaces company It pours, increase rate 66.7%, realizes ultra-deep and rush the batch of cold rolling glassed steel, efficient, steady production, there is significant economic effect Benefit.
Detailed description of the invention
Fig. 1 is that the procedure Procedure for the secondary refining method that the raising ultra-deep in the present invention rushes cold rolling glassed steel casting sequence shows It is intended to.
Specific embodiment
One group of 5 furnace ultra-deep, which is smelted, below with reference to 300 tons of converter-RH furnaces of steel mill rushes cold rolling glassed steel to the art of this patent thought It is described in detail.
Embodiment 1
A kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence, comprising the following steps:
(1) converter smelting.Converter molten steel ingredient is qualified, and tapping when Molten Steel End Point reaches target, tapping temperature is shown in Table 1 It is shown.
1 Tapping Temperature of Bof table of table
Heat (batch) number A B C D E
Tapping temperature/DEG C 1698 1695 1697 1692 1690
(2) lime is added during converter tapping, during lime is added, opens steel ladle bottom argon blowing and closes bottom blowing after lime fusing Argon.Lime adding amount and argon flow are specifically shown in Table 2.
2 converter tapping phase of table lime adding amount and argon flow
(3) quantity of slag under converter control, specifically the lower quantity of slag is shown in Table 3.
3 converter tapping quantity of table
Heat (batch) number A B C D E
Ladle slag thickness/mm 48 42 50 45 50
The quantity of slag/kg/ tons of steel under converter 3.3 2.8 4.3 2.4 2.9
(4) after molten steel is stood into alloy fine tuning, ladle top slag modifier is added by distributing device, does not during which open ladle bottom blowing Argon.Ladle top slag modifier additional amount and composition are shown in Table 4.
4 ladle top slag modifier additional amount of table and composition table
(5) molten steel starts decarburization nitrogen pick-up into vacuumizing after RH.Specific control parameter is shown in Table 5.
5 RH carbon period main control parameters table of table
(6) aluminum shot is added after decarburization and carries out deoxidation and alloying.Deoxidation aluminum shot be added to addition after 6 minutes (second Walk nitrogen pick-up), lift gas is nitrogen, and nitrogen flow is set as 180-200Nm3/ hour, vacuum degree are set as 50-100mbar； Specific control parameter is shown in Table 6.
Table 6 plus aluminum shot deoxidation and alloying technology parameter list
(7) after deoxidation aluminum shot is added 6 minutes, sulphur iron, electrolytic manganese, ferrotianium, copper sheet is added, alloying is carried out to molten steel.Sulphur Molten steel recycles 15-20 minutes broken skies after iron, electrolytic manganese, ferrotianium, copper sheet are added.Lift gas is nitrogen, and nitrogen flow is set as 180-200Nm3/ hour, vacuum degree are set as 50-100mbar.Specific control parameter and it the results are shown in Table 7.
7 adduction billon technological parameter of table and the broken empty chemical component of RH
(8) the broken sky of RH.Ladle top slag modifier is added after broken empty, it is required that are as follows: MAl >=45.0%, CaO >=45.0%, SiO2≤ 8.0%, H2O≤0.5%, granularity: 5-28mm > 85%, > 30mm≤5%.Ladle top slag modifier additional amount according to The adjustment of RH blowing oxygen quantity: when RH blowing oxygen quantity is 0, add 150-200kg；RH blowing oxygen quantity 0-100Nm3When, add 200-300kg；RH oxygen blast Measure 101-200Nm3When, add 300-400kg, RH blowing oxygen quantity >=201Nm3When, add 400-500kg；It, which is added, requires are as follows: uniform cloth It sets on ladle top slag surface.Specific control parameter is shown in Table 8.
Ladle top slag modifier additional amount and composition after 8 RH of table
From the foregoing, it can be seen that using method of the invention, ultra-deep, which is rushed cold rolling glassed steel casting sequence and even poured by pervious 3 furnace, to be mentioned Up to 5 furnaces even pour, increase rate 66.7%, realize ultra-deep and rush the batch of cold rolling glassed steel, efficient, steady production, have significant Economic benefit.
It is above-mentioned referring to embodiment to it is a kind of raising ultra-deep rush cold rolling glassed steel casting sequence secondary refining method carry out Detailed description, is illustrative without being restrictive, can enumerate several embodiments according to limited range, therefore not The change and modification being detached under present general inventive concept, should belong within protection scope of the present invention.

Claims (10)

1. a kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence, which is characterized in that the method includes Following steps:
(1) converter smelting: by molten iron and scrap smelting at first steel-making water；
(2) first step modification alloy fine tuning station: is carried out to ladle top slag；
(3) RH vacuum refining furnace: decarburization and nitrogen pick-up are carried out after RH molten steel circulation, carries out determining oxygen when decarburization starts, after decarburization Aluminum shot is added and carries out deoxidation and alloying, ladle top slag modifier is added after the broken sky of RH and carries out secondary modification.
2. rushing the secondary refining method of cold rolling glassed steel casting sequence according to raising ultra-deep described in claim 1, which is characterized in that In the step (1), control converter smelting tapping temperature is 1680-1700 DEG C, and lime is added during converter tapping, and lime is added Period opens steel ladle bottom argon blowing and closes BOTTOM ARGON BLOWING after lime fusing；The lower quantity of slag of control room converter during converter tapping.
3. the secondary refining method according to claim 2 for improving ultra-deep and rushing cold rolling glassed steel casting sequence, feature exist In in the step (1), the additional amount of lime is 2-5kg/ tons of steel；Argon flow is set as 100-400Nm3/ hour；Converter The lower quantity of slag is not greater than 4.5kg/ tons of steel.
4. the secondary refining method according to claim 1 for improving ultra-deep and rushing cold rolling glassed steel casting sequence, feature exist In, in the step (2), the requirement of first step modification ladle top slag modifier used are as follows: MAl >=45.0%, CaO >= 45.0%, SiO2≤ 8.0%, H2O≤0.5%；Granularity: 5-28mm > 85%, > 30mm≤5%；The ladle top slag modifier Additional amount be 1-3kg/ tons of steel.
5. the external refining side according to any one of claims 1-4 improved ultra-deep and rush cold rolling glassed steel casting sequence Method, which is characterized in that in the step (3), the condition of the nitrogen pick-up are as follows: during decarburization, lift gas is nitrogen, nitrogen flow It is set as 170-190 Nm3/ hour, retention time >=10 minute under the conditions of vacuum level requirements≤2.6mbar；When decarburization starts into Row determines oxygen, and control decarburization terminates molten steel activity oxygen in 150-300ppm.
6. the external refining side according to any one of claims 1-4 improved ultra-deep and rush cold rolling glassed steel casting sequence Method, which is characterized in that in the step (3), progress nitrogen pick-up in 6 minutes after deoxidation aluminum shot is added to addition, the condition of the nitrogen pick-up Are as follows: lift gas is nitrogen, and nitrogen flow is set as 180-200Nm3/ hour, vacuum degree are set as 50-100mbar.
7. the external refining side according to any one of claims 1-4 improved ultra-deep and rush cold rolling glassed steel casting sequence Method, which is characterized in that in the step (3), after deoxidation aluminum shot is added 6 minutes, sulphur iron, electrolytic manganese, ferrotianium, copper sheet is added to steel Water carries out alloying, synchronizes to molten steel nitrogen pick-up；Molten steel recycles 18-24 minutes after sulphur iron, electrolytic manganese, ferrotianium, copper sheet are added；It is described The condition of nitrogen pick-up are as follows: lift gas is nitrogen, and nitrogen flow is set as 180-200 Nm3/ hour, vacuum degree are set as 50- 100mbar。
8. the external refining side according to any one of claims 1-4 improved ultra-deep and rush cold rolling glassed steel casting sequence Method, which is characterized in that in the step (3), carry out the ladle top slag modifier requirement of secondary modification are as follows: MAl >=45.0%, CaO >=45.0%, SiO2≤ 8.0%, H2O≤0.5%；Granularity: 5-28mm > 85%, > 30mm≤5%；Ladle top slag modification Agent additional amount is adjusted according to RH blowing oxygen quantity: when RH blowing oxygen quantity is 0, adding 150-200kg；RH blowing oxygen quantity 0-100Nm3When, add 200- 300kg；RH blowing oxygen quantity 101-200Nm3When, add 300-400kg, RH blowing oxygen quantity >=201Nm3When, add 400-500kg.
9. the external refining side according to any one of claims 1-4 improved ultra-deep and rush cold rolling glassed steel casting sequence Method, which is characterized in that the ultra-deep rushes the chemical component that cold rolling glassed steel includes following weight percent: carbon≤0.005%, silicon ≤ 0.030%, manganese 0.05-0.35%, phosphorus≤0.020%, sulphur 0.015-0.035%, dissolved aluminum 0.015-0.050%, titanium 0.070-0.10%, nitrogen 0.0050-0.0100%, copper 0.02-0.04%, surplus are iron and inevitable impurity.
10. a kind of preparation method of superb deep-draw cold rolling glassed steel, including converter smelting → alloy finely tune station → RH vacuum refining Furnace → sheet billet continuous casting technique, which is characterized in that the converter smelting, alloy fine tuning station, RH vacuum refining furnace step are according to right It is required that method described in 1-9 any one carries out.
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Cited By (6)

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CN111041352A (en) * 2019-11-30 2020-04-21 江苏省沙钢钢铁研究院有限公司 External refining production method of wire rod for cutting diamond wire
CN111187874A (en) * 2020-03-02 2020-05-22 马鞍山钢铁股份有限公司 Production method for reducing pore defects of ultra-low carbon enamel steel casting blank with C less than or equal to 0.0030%
CN111334635A (en) * 2020-03-16 2020-06-26 包头钢铁（集团）有限责任公司 Method for modifying top slag of deep-drawing steel
CN112342333A (en) * 2020-11-06 2021-02-09 马鞍山钢铁股份有限公司 High-efficiency low-oxygen-level ultra-low-carbon steel production method
CN112646953A (en) * 2020-11-23 2021-04-13 首钢集团有限公司 Steel slag modification method and device for ultra-low carbon steel
CN115305411A (en) * 2022-08-15 2022-11-08 马鞍山钢铁股份有限公司 Method for efficiently producing ultra-deep drawing cold-rolled enamel steel

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