CN106399633B - A kind of ship steel molten steel magnesium treatment process - Google Patents
A kind of ship steel molten steel magnesium treatment process Download PDFInfo
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- CN106399633B CN106399633B CN201610871499.2A CN201610871499A CN106399633B CN 106399633 B CN106399633 B CN 106399633B CN 201610871499 A CN201610871499 A CN 201610871499A CN 106399633 B CN106399633 B CN 106399633B
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/04—Removing impurities by adding a treating agent
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Abstract
A kind of ship steel molten steel magnesium treatment process, belongs to clean steel field of smelting；Technique is as follows: firstly, determining station and the opportunity of magnesium processing: Mg-Al-Fe alloy claded wire is added after the fine tuning of LF process alloy or after the vacuum processing of RH process；Secondly, under the premise of guaranteeing Mg-Al-Fe alloy claded wire magnesium treatment effect, coordinating configuration according to steel grade acid-soluble aluminum content and feeding aluminum amount and magnesium processing line feeding amount；Then, it carries out magnesium processing: in LF or RH process, using Mg-Al-Fe alloy claded wire is added in core-spun yarn feeding normal direction ship steel molten steel, finally obtaining finished product molten steel.Deck of boat rate dexidized steel molten steel magnesium treatment process of the invention, applies in ship steel refining process, can control deck of boat steel cleanness and steel inclusion ingredient, quantity, granularity and its distribution；The method of the present invention improves deck of boat steel cleanness and non-metallic inclusion controlled level, so as to improve the mechanical property and its stability of ship steel.
Description
Technical field
The invention belongs to clean steel field of smelting, in particular to a kind of ship steel molten steel magnesium treatment process.
Background technique
Ship steel is mainly for the manufacture of ocean, coastal and inland navigation vessels hull, deck etc..Ship steel is in service phase
Between not only need to bear chemical/electrochemical/biological corrosion, still suffer from the caused stress alternation effect of stormy waves impact, in addition,
Ship processing and forming technology is complicated, this requires ship steel to have good toughness, intensity, corrosion resistance, welding performance, processing
Processability.In China, with the development of the social economy, the demand to ship steel is continuously improved, after 2003, ship steel is raw
Production enters Rapid development stage, and by 2010, deck of boat output of steel reached 20,500,000 tons, is fallen after rise later, 2011 years with
After be basically stable at about 10,000,000 tons.With the raising of ship steel production technology and quality control level, China is peculiar to vessel at present
The localization rate of parts and components of steel alreadys exceed 95%, but from the point of view of Chinese ship steel comprehensive performance, it is huge cannot still to fully meet shipbuilding industry
Type, diversification, high-tech, duration shortening and cost-effective requirement, especially high technology content, high added value
The high-level deck of boat also needs import.
Domestic ship steel mainly passes through the smelting of BOF-LF (RH)-CC technique, with pneumatic steelmaking, external refining and continuous casting etc.
The application of theoretical developments and advanced technology is made steel, ship steel Cleanliness of Molten Steel controlled level is continuously improved, but that there is also steel is complete
The problems such as oxygen content is high, inclusion size is exceeded and cleanliness control stability is poor, cause finished product plate flaw detection qualification rate it is lower,
Stability is poor, it is lower to become a useful person, and seriously constrains the promotion of Business Economic Benefit.How Cleanliness of Molten Steel is improved and to steel
It is the key that further increase deck of boat Steel Properties that middle composition of inclusions, granularity and its distribution, which control effectively,.
Ship steel is typical aluminium deoxidation steel grade, deoxidation products Al2O3With significant polymerization tendency, stay in steel not only
The performance of steel is had adverse effect, and can lead to nozzle clogging, the castability of molten steel is significantly reduced and influences to produce suitable
Row.To solve this problem, Calcium treatment technology is generallyd use at present come the Al that goes bad2O3It is mingled with.In actual production, Calcium treatment technology
Certain limitation is shown, is on the one hand limited by liquid phase calcium aluminate physicochemical properties and rhythm of production, field trash is gone
Remain in steel except effect is not significant；In addition, Calcium treatment is not significant to the granularity and its distributed controll effect of field trash,
Such as the presence that D class calcium aluminate is mingled in steel has adverse effect the performance of steel.
Relative to Calcium treatment, molten steel magnesium, which is handled, has outstanding feature, and first, the processing of molten steel magnesium has the function of cleaning molten steel
Can, dissolved oxygen content can be substantially reduced, the cleanliness for improving molten steel is conducive to；Second, have the function of Control and Inclusion Removal, passes through change
Matter effect, control steel inclusion is distributed in small and dispersed state, to reduce harm of the field trash to steel mechanics performance；Separately
Outside, to the control function of ship steel welding tissue, the magnesium system oxidation of the tiny size generated that goes bad, stable components, Dispersed precipitate
Object be mingled with can pinning crystal boundary in the welding process, Intragranular Acicular Ferrite (IGF) forming core is induced, to be conducive to improve sweating heat shadow
Ring the tissue and performance of area (HAZ).
But it at home, focuses mostly on molten steel magnesium Processing Technology Research in basic theory and laboratory research stage, industry
Change Integration ofTechnology and application yet there are no report.The present invention is to rely on ship steel BOF-LF (RH)-CC smelting process, proposes one
Kind can be suitable for industrialized production needs, when including magnesium metal adding manner, Adding Way, parameter, magnesium processing is added
Molten steel magnesium including the key technologies such as machine and molten steel composition coordinated control handles integrated technique technology, and the technology is truly real
Conversion of the molten steel magnesium processing technique from laboratory research to industrial applications is showed, for molten steel magnesium processing technique in Al deoxidization steel
The application planted in producing has reference with expansion.
Summary of the invention
The present invention provides a kind of ship steel molten steel according to ship steel BOF-LF-CC or BOF-LF-RH-CC smelting process
Magnesium treatment process.
The key problem of the industrial application of molten steel magnesium processing technique be as how obtain sufficiently high magnesium metal recovery rate and
Good magnesium treatment effect.It is the adding manner problem of magnesium metal to be solved first, being usually added in a manner of alloy can be effective
It realizes the sustained release of magnesium metal, reduces the probability that magnesium metal overflows molten steel because of vaporization, under study for action, Ni-Mg ladle refining molten steel
For the representative adding manner of magnesium metal, but for industrialized production, one side Ni is expensive, on the other hand big absolutely
Several steel grades do not contain or do not require Ni element, that is to say, that adding manner and improper, need using Ni-Mg alloy as magnesium
Seek a kind of new containing magnesium alloy；Secondary need solves the problems, such as the Adding Way and its technological parameter of magnesium alloy, that is, solves such as
The problem of what is added, is able to enter magnesium alloy inside molten steel, to further increase the recovery rate of magnesium metal, promote magnesium processing
The promotion of effect；Third needs to solve the problems, such as addition opportunity, that is, solves in steelmaking process which in stage and carry out asking for magnesium processing
Topic, keeps its effect more significant；The fourth is that solve ladle chemistry Harmonic Control, while guaranteeing magnesium treatment effect
Also to meet the requirement of molten steel composition control target, this is closely related with magnesium alloy ingredient, alloy addition.
Ship steel molten steel magnesium treatment process of the invention is as follows:
Firstly, determining station and the opportunity of magnesium processing:
If ship steel smelting procedure uses BOF-LF-CC, Mg-Al-Fe alloy is added after the fine tuning of LF process alloy
Core-spun yarn；
If ship steel smelting procedure uses BOF-LF-RH-CC, Mg-Al-Fe is added after the vacuum processing of RH process and closes
Golden core-spun yarn；
Wherein:
The ingredient and its mass percentage of Mg-Al-Fe alloy are as follows: Mg:5~15%, Al:40~65%, surplus Fe
With inevitable impurity；
Mg-Al-Fe alloy claded wire parameter are as follows: 13~13.8mm of diameter of phi, thickness of scale are 0.4~0.42mm, core powder
Granularity is 0.01~3mm, 0.2~0.3kg/m of core powder filling rate；
Secondly, determining that aluminum amount and magnesium handle line feeding amount
Coordinate to match under the premise of guaranteeing Mg-Al-Fe alloy claded wire magnesium treatment effect according to steel grade acid-soluble aluminum content
It sets and feeds aluminum amount and magnesium processing line feeding amount；
Then, it carries out magnesium processing: in LF or RH process, being fed in normal direction ship steel molten steel using core-spun yarn and Mg- is added
Al-Fe alloy claded wire, it is final to obtain finished product molten steel；Wherein, the feeding parameter of Mg-Al-Fe alloy claded wire are as follows: feeding position
For two air brick opposite side of ladle, at 1/3~1/2 radius of ladle center, wire-feeding velocity is 2.5~4.0ms-1；
In the method for the present invention, the ship steel is Al deoxidization steel.
In the method for the present invention, molten steel is added in a manner of Mg-Al-Fe alloy and carries out the processing of molten steel magnesium, which utilizes aluminium
Prepared by the characteristics of can easily forming arbitrary proportion alloy with magnesium and iron, the presence of Aluminum in Alloy and iron can effectively dilute magnesium metal, iron
Presence can effectively improve the fusion temperature of alloy, this can be effectively controlled the fusing of magnesium metal or release, dissolution, diffusion with it is anti-
It answers；Due to containing metallic aluminium in alloy, which is only applicable to the molten steel magnesium processing of Al deoxidization steel.
In the method for the present invention, Mg-Al-Fe alloy is added by molten steel using core spun yarn feeding method.Molten steel is added in alloy
Method mainly includes throw-in play, Ladle Bottom spraying powder method and core spun yarn feeding method etc.；For Mg-Al-Fe alloy of the invention
For, density is lower than molten steel, and it is not easily-controllable that depth is added vulnerable to the influence of ladle slag blanket and molten steel buoyancy using throw-in play
System, it is difficult to obtain stable magnesium recovery rate and treatment effect；If be added in the method that bottom is dusted, need for magnesium alloy to be milled into
Powder and need to add powder spraying system and carry out ladle structure of modification；If feeding molten steel in the form of core-spun yarn, tune can be passed through
Whole line feeding pipe size and angle control suitable line feeding position, realize that line feeding is deep-controlled by adjusting wire-feeding velocity, and
Core-spun yarn technology of preparing is mature, and using the existing wire-feeding device comprising straightening wire-leading device of steel mill.
The determination of Mg alloy cored wine feeding parameter of the invention: under alloying component certain condition, the recovery rate master of magnesium
Related with the feeding position of core-spun yarn and feeding depth, if line feeding position is in sinking region, magnesium metal is with molten steel
It falls before and rises again, be conducive to magnesium metal and keep liquid in a long time, extend diffusion time of the magnesium metal in molten steel,
To increase the chance reacted with non-metallic inclusion in molten steel；The suitable depth that is added is conducive to inhibit the gasification of magnesium and improve
The recovery rate of magnesium.
In the method for the present invention, when molten steel is to be smelted using BOF-LF-CC technique, Mg-Al-Fe alloy feeds the work of molten steel
Position and opportunity are as follows: carried out after alloy fine tuning, the soft blow time is more than or equal to 12min after line feeding；When molten steel is using BOF-LF-
When RH-CC technique is smelted, Mg-Al-Fe alloy feeds station and the opportunity of molten steel are as follows: carries out, feeds after RH application of vacuum is pressed again
The soft blow time is more than or equal to 12min after line.The ship steel production process smelted using BOF-LF-CC or BOF-LF-RH-CC technique
With require it is as follows: in converter procedure, after smelting endpoint temperature and carbon, phosphorus, sulphur ingredient are qualified, slag-stopping tapping simultaneously carries out deoxygenated alloy
Change, lime etc. is added after tapping and carries out top Slag treatment；Feeding aluminum steel adjusts dissolved aluminum after LF process, the thermometric that enters the station sampling
Content is added lime to after heating position and pushes up slag deoxidier, heat temperature raising makes white slag and carries out alloy fine tuning.For requiring hydrogen to contain
The steel grade for measuring control, need to be through RH refining treatment.
In the method for the present invention, use molten steel composition Coordinated Control: using in the present invention is Mg-Al-Fe alloy, is closed
Metal aluminum content is higher in gold, will increase acid-soluble aluminum content in molten steel after alloy feeding molten steel；To meet acid-soluble aluminum content requirement,
The present invention coordinates under the premise of guaranteeing magnesium treatment effect according to aluminium content in steel grade acid-soluble aluminum content control target, magnesium alloy
Configuration LF, which enters the station, feeds aluminum amount and magnesium processing line feeding amount；Such as LF can control in steel acid-soluble aluminum content when entering the station in target lower limit.
Ship steel molten steel magnesium treatment process of the invention, has the beneficial effect that
(1) the method for the present invention is applied in ship steel refining process, and magnesium treatment process is steady, can effectively ensure that magnesium metal
Recovery rate and magnesium treatment effect, and be conducive to improve working environment.
(2) the method for the present invention is applied in ship steel refining process, Cleanliness of Molten Steel can effectively be turned up, and can effectively control
Ingredient, quantity, granularity and its distribution of nonmetallic inclusionsin steel processed are conducive to the mechanical property and its stabilization that improve steel
Property.
Detailed description of the invention
The BOF-LF-CC route magnesium processing technological flow figure of Fig. 1 embodiment of the present invention 1；
The BOF-LF-RH-CC route magnesium processing technological flow figure of Fig. 2 embodiment of the present invention 2 and embodiment 3.
Specific embodiment
Embodiment 1
A kind of ship steel molten steel magnesium treatment process is as follows:
Firstly, determining station and the opportunity of magnesium processing:
The steel grade that the present embodiment relies on is Q345B steel, and smelting process route used by the steel grade is BOF-LF-CC, into
The industrial productions of two heats is gone；BOF nominal capacity is 150 tons, and Mg-Al-Fe alloy claded wire line feeding operation is closed in LF
It is carried out after the completion of gold fine tuning；The ingredient and its mass percent of Mg-Al-Fe alloy are as follows: Mg:5.32%, Al:52.61%, Fe:
41.70%, surplus is the impurity such as carbon silicomanganese phosphorus sulphur；Mg-Al-Fe alloy claded wire parameter are as follows: diameter of phi 13mm, thickness of scale are
0.42mm, core Powder Particle Size are 0.01~3mm, core powder filling rate 0.25kg/m；
BOF-LF-CC route magnesium processing technological flow is as shown in Figure 1；
Secondly, determining that aluminum amount and magnesium handle line feeding amount
Coordinate to match under the premise of guaranteeing Mg-Al-Fe alloy claded wire magnesium treatment effect according to steel grade acid-soluble aluminum content
It sets and feeds aluminum amount and magnesium processing line feeding amount, specific as follows:
Composition Control: it after LF enters the station, is entered the station acid-soluble aluminum content according to the steel grade acid-soluble aluminum content control range and molten steel, such as
Shown in table 1, controlled by lower limit 0.015%；Line feeding amount is 150m；
Then, it carries out magnesium processing: after the fine tuning of LF alloy, being fed in normal direction ship steel molten steel using core-spun yarn and Mg- is added
Al-Fe alloy claded wire；Wherein, the feeding parameter of Mg-Al-Fe alloy claded wire are as follows: feeding position is two air brick pair of ladle
Side, at 1/2 radius of ladle center, wire-feeding velocity 3.0m.s-1；
Line feeding process is steady, does not occur molten steel splash and turns over phenomenon greatly, only exists in molten steel surface core-spun yarn feeding position
Faint light, no obvious flue dust generate；It is final to obtain Q345B finished product molten steel.
Q345B steel finished product molten steel composition is as shown in table 1, meets inner quality standard requirement.
Two heat continuous casting billet total oxygen contents are 0.0013%, compared with average 0.0020% significant drop of protocalcium treatment process
It is low；Non-metallic inclusion control effect shows that alumina inclusion was sufficiently gone bad as being mingled with based on magnesium aluminate spinel in steel
Object, non-metallic inclusion granularity accounts for 90% or more less than 2 μm when LF is leaving from station, and average diameter is 1.112 μm, compared with Calcium treatment technique
Significant refinement, is distributed in small and dispersedization.
1 Q345B steel finished product molten steel composition (mass percent, %) of table
Embodiment 2
A kind of ship steel molten steel magnesium treatment process is as follows:
Firstly, determining station and the opportunity of magnesium processing:
The steel grade that the present embodiment relies on is AH32 steel, and smelting process route used by the steel grade is BOF-LF-RH-CC,
The industrial production of two heats is carried out, BOF nominal capacity is 150 tons, and Mg-Al-Fe alloy claded wire operates in RH vacuum
It is carried out after processing；The ingredient and its mass percent of Mg-Al-Fe alloy are as follows: 10.18%Mg, 54.87%Al, 34.71%Fe,
Surplus is the impurity such as carbon silicomanganese phosphorus sulphur；Mg-Al-Fe alloy claded wire parameter are as follows: diameter of phi 13mm, thickness of scale 0.42mm,
Core Powder Particle Size is 0.01~3mm, core powder filling rate 0.25kg/m；
BOF-LF-RH-CC route magnesium processing technological flow is as shown in Figure 2；
Secondly, determining that aluminum amount and magnesium handle line feeding amount
Coordinate to match under the premise of guaranteeing Mg-Al-Fe alloy claded wire magnesium treatment effect according to steel grade acid-soluble aluminum content
It sets and feeds aluminum amount and magnesium processing line feeding amount, specific as follows:
Composition Control: it after LF enters the station, is entered the station acid-soluble aluminum content according to the steel grade acid-soluble aluminum content control range and molten steel, such as
Shown in table 2, controlled by lower limit 0.015%；Line feeding amount is 100m；
Then, it carries out magnesium processing: after RH is pressed again, being fed in normal direction ship steel molten steel using core-spun yarn and Mg-Al-Fe is added
Alloy claded wire；Wherein, the feeding parameter of Mg-Al-Fe alloy claded wire is as follows: feeding position is two air brick opposite side of ladle,
At 1/2 radius of ladle center, wire-feeding velocity 3.0ms-1；
Line feeding process is steady, does not occur molten steel splash and turns over phenomenon greatly, only exists in molten steel surface core-spun yarn feeding position
Faint light, no obvious flue dust generate；It is final to obtain AH32 finished product molten steel.
AH32 steel finished product molten steel composition is as shown in table 2, meets inner quality standard requirement.
Two heat continuous casting billet total oxygen contents are respectively 0.0012% and 0.0010%, more former putting down using Calcium treatment technique
Equal 0.0020% significantly reduces；Alumina inclusion is sufficiently gone bad as the field trash based on magnesium aluminate spinel in steel, and LF is leaving from station
When non-metallic inclusion granularity less than 2 μm account for 92% or more, average diameter is 1.207 μm, significantly refined compared with Calcium treatment technique,
It is distributed in small and dispersedization.
2 AH32 steel finished product molten steel composition (mass percent, %) of table
Embodiment 3
A kind of ship steel molten steel magnesium treatment process is as follows:
Firstly, determining station and the opportunity of magnesium processing:
The steel grade that the present embodiment relies on is DH36 steel, and smelting process route used by the steel grade is BOF-LF-RH-CC,
The industrial production of 5 heats is carried out, BOF nominal capacity is 150 tons, and it is laggard in RH application of vacuum that magnesium handles line feeding operation
Row；The ingredient and its mass percent of Mg-Al-Fe alloy are as follows: Mg:8.24%, Al:56.47%, Fe:35.23%, surplus are
The impurity such as carbon silicomanganese phosphorus sulphur；Mg-Al-Fe alloy claded wire parameter are as follows: diameter of phi 13mm, thickness of scale 0.42mm, core powder
Degree is 0.01~3mm, core powder filling rate 0.24kg/m；
BOF-LF-RH-CC route magnesium processing technological flow is as shown in Figure 2；
Secondly, determining that aluminum amount and magnesium handle line feeding amount
Coordinate to match under the premise of guaranteeing Mg-Al-Fe alloy claded wire magnesium treatment effect according to steel grade acid-soluble aluminum content
It sets and feeds aluminum amount and magnesium processing line feeding amount, specific as follows:
Composition Control: it after LF enters the station, is entered the station acid-soluble aluminum content according to the steel grade acid-soluble aluminum content control range and molten steel, such as
Shown in table 3, controlled by lower limit 0.015%；Line feeding amount is 120m；
Then, it carries out magnesium processing: after RH is pressed again, being fed in normal direction ship steel molten steel using core-spun yarn and Mg-Al-Fe is added
Alloy claded wire；Wherein, the feeding parameter of Mg-Al-Fe alloy claded wire is as follows: feeding position is two air brick opposite side of ladle,
At 1/3 radius of ladle center, wire-feeding velocity 4.0m.s-1；
Line feeding process is steady, does not occur molten steel splash and turns over phenomenon greatly, only exists in molten steel surface core-spun yarn feeding position
Faint light, no obvious flue dust generate；It is final to obtain DH36 finished product molten steel.
DH36 steel finished product molten steel composition is as shown in table 3, meets inner quality standard requirement.
3 DH36 steel finished product molten steel composition (mass percent, %) of table
Five heat continuous casting billet total oxygen content controls are stablized, average out to 0.0013%, and substantially less than Calcium treatment technique is flat
Equal level 0.0020%；Alumina inclusion is sufficiently gone bad as the field trash based on magnesium aluminate spinel in steel, non-when RH is leaving from station
Metallic inclusion granularity accounts for 94% or more less than 2 μm, and average diameter changes in 1.1~1.25 μ ms, small and dispersed
It is significant to change distribution characteristics.Finished steel plate main mechanical properties index fully meets the requirement of national standard, and yield strength stretches by force
Degree, elongation percentage and 0 DEG C of impact of collision function average value have respectively reached 422.8MPa, 541MP, 28.6% and 207.8J, respectively compared with
Protocalcium treatment process improves 7.86%, 4.64%, 26.55% and 12.32%.
Claims (1)
1. a kind of ship steel molten steel magnesium treatment process, which comprises the steps of:
Firstly, determining station and the opportunity of magnesium processing:
Ship steel smelting procedure uses BOF-LF-RH-CC, and Mg-Al-Fe alloy cored is added after RH process is vacuum-treated multiple pressure
Line, the soft blow time is more than or equal to 12min after line feeding；
Wherein:
The ship steel is Al deoxidization steel, selects Q345B or AH32 steel；
The ingredient and its mass percentage of Mg-Al-Fe alloy are as follows: Mg:8.24 ~ 10.18%, Al:54.87~56.47%, surplus
For Fe and inevitable impurity；
Mg-Al-Fe alloy claded wire parameter are as follows: diameterΦ13mm, thickness of scale 0.42mm, core Powder Particle Size are 0.01~3mm,
0.24~0.25kg/m of core powder filling rate；
Secondly, determining that aluminum amount and magnesium handle line feeding amount:
According to steel grade acid-soluble aluminum content, under the premise of guaranteeing Mg-Al-Fe alloy claded wire magnesium treatment effect, coordinates configuration and feed
Aluminum amount and magnesium handle line feeding amount: acid-soluble aluminum content is controlled in steel when LF enters the station in target lower limit；
Then, it carries out magnesium processing: in LF or RH process, being fed in normal direction ship steel molten steel using core-spun yarn and Mg-Al-Fe is added
Alloy claded wire, it is final to obtain finished product molten steel；Wherein, the feeding parameter of Mg-Al-Fe alloy claded wire are as follows: feeding position is steel
Two air brick opposite sides are wrapped, at 1/3 ~ 1/2 radius of ladle center, wire-feeding velocity is 3.0 ~ 4.0ms-1。
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| CN109628693B (en) * | 2019-01-28 | 2021-08-27 | 苏州大学 | Low-cost magnesium-treated microalloyed steel and preparation method thereof |
| CN110117694B (en) * | 2019-04-09 | 2021-06-04 | 上海大学 | Magnesium adding process for magnesium-containing free-cutting steel |
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| CN113913673B (en) * | 2021-09-27 | 2022-08-23 | 武汉钢铁有限公司 | Method for controlling size and quantity of inclusions in steel by magnesium-containing alloy |
| CN115029508B (en) * | 2022-05-16 | 2023-05-16 | 上海大学 | Method for improving magnesium modification effect of IF steel |
| CN115232914B (en) * | 2022-05-16 | 2023-05-16 | 上海大学 | Method for improving modification effect of ship plate steel magnesium |
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