CN107828932B - A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon - Google Patents

A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon Download PDF

Info

Publication number
CN107828932B
CN107828932B CN201711134626.1A CN201711134626A CN107828932B CN 107828932 B CN107828932 B CN 107828932B CN 201711134626 A CN201711134626 A CN 201711134626A CN 107828932 B CN107828932 B CN 107828932B
Authority
CN
China
Prior art keywords
steel
content
slag
argon
calcium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711134626.1A
Other languages
Chinese (zh)
Other versions
CN107828932A (en
Inventor
徐培春
刘凯
吴维轩
胡俊辉
黄东
熊英
邱晨
叶飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Iron and Steel Co Ltd
Original Assignee
Wuhan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Iron and Steel Co Ltd filed Critical Wuhan Iron and Steel Co Ltd
Priority to CN201711134626.1A priority Critical patent/CN107828932B/en
Publication of CN107828932A publication Critical patent/CN107828932A/en
Application granted granted Critical
Publication of CN107828932B publication Critical patent/CN107828932B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising
    • 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
    • C21C7/0006—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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • 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

Abstract

A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon: carrying out desulfurization to molten iron；It skims；Converter smelting；Tapping；Deoxidation and alloying；Into argon station Argon；It is refined in LF furnace；It is conventional to use protective casting at base.The present invention, which solves, to be caused because of surface quality defect that oven improvement is high, ingredient qualification rate is low in abbreviated system production in the low silicon aluminium killed steel of smelting low carbon at present and pours that steel is disconnected to pour the problems such as frequent, make clip surface impurity defect oven improvement down within 0.4%, ingredient qualification rate is increased to 98.5% or more, pours the disconnected rate of pouring of steel down within 0.4%.

Description

A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon
Technical field
The present invention relates to killed steel production field, the smelting with CSP short route production low carbon low silicon aluminium killed steel is particularly belonged to Smelting method.
Background technique
Low carbon low silicon aluminium killed steel, such as: RST330, DC01 and Q235J0 are widely used in electrical, building, machinery etc. Industry.For the steel grade, it should have good ductility and puncture energy for market demands, this surface for continuous casting billet Quality requirement is stringent；In addition, steel grades design is also required both to can be carried out with aluminium deep deoxidation, ensure silicon control in Si again] ≤ 0.04%, this proposes a problem to steelmaking process control again.
China Patent Publication No. is the document of CN104056871, discloses " a kind of production technology for controlling field trash ".Its By control process deoxidation and inclusions class, high-melting-point field trash in steel is set to be changed into low melting point with low alkalinity slag system Silicate inclusion, but this document exists poor to the adsorption capacity of aluminium deoxidation generation field trash and easily causes silicate in steel The exceeded deficiency of type impurity.
The document of Chinese patent literature entitled " control method of oxygen in a kind of low carbon low silicon aluminium killed steel ", discloses " a kind of control technique of aluminum killed steel smelting process oxygen ", through analyzing, the document is in producing low silicon aluminium killed steel, and there are costs It is high, be also easy to produce large-sized inclusions and the problems such as production disruption pours frequent accident.
In existing CSP producing line low carbon low silicon aluminium killed steel production technology, clip surface impurity defect oven improvement be higher than 1.2%, Ingredient qualification rate is lower than 95%, pours the disconnected rate of pouring of steel higher than 0.8%.It traces it to its cause mainly to steelmaking process deoxidation, refining slag making, folder The removal and modification of sundries control improper cause.
Summary of the invention
The present invention is in view of the deficienciess of the prior art, propose one kind in the low silicon aluminium killed steel of CSP producing line smelting low carbon Control method.By the control to Als, S in deoxidation in steel making, slag and LF furnace refining process, it is low to solve existing CSP producing line The surface inclusion defect oven improvement of the low silicon aluminium killed steel of carbon is high, ingredient qualification rate is low and pours that steel is disconnected to pour the problems such as frequent, so that changing Rate is sentenced down within 0.4%, and ingredient qualification rate is increased to 98.5% or more, pours the disconnected rate of pouring of steel down within 0.4%.
Realize the measure of above-mentioned purpose:
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:5 ~ 7, and blowing magnesium powder speed is not less than 7.0kg/min, is blown the time in 10 ~ 15min；Control iron after desulfurization S≤0.03wt% in water；
2) it skims, adds in skimming according to 0.2 ~ 0.4kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, It controls molten iron bare area and is not less than 85%；
3) carry out converter smelting: tapping temperature control is being not less than 1660 DEG C；Using slag-stopping tapping, the control of slag thickness is not surpassing 30mm is crossed, Control for Oxygen Content is in 500 ~ 600ppm in molten steel；
4) it taps: when tapping is to 1 ~ 2min, according to 2.5 ~ 4kg/ ton steel addition lime；
5) it carries out deoxidation and alloying: aluminium is added according to 1.6 ~ 2.0kg/ tons of steel, proportionately set up provisioning request separately and manganese iron is added；
6) into argon station Argon: Argon amount is controlled in 200 ~ 800m3/ min, argon blowing time are no more than 8min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 450 ~ 700 ppm, S content is no more than 0.020wt%；
When it is concise to 10min when, the Als content in molten steel is no more than 200 ppm, and S content is no more than 0.012wt%；
When it is concise to 20min when, for the Als content in molten steel in 250 ~ 350 ppm, S content is no more than 0.006wt%；
B, argon flow is adjusted to 10 ~ 50m3/ min, argon blowing time is in 8 ~ 12min；
C, carry out Calcium treatment: calcium line feed quantity is carried out according to 0.61 ~ 0.91kg/ tons of steel, and control feeding speed 3 ~ 3.5m/min；Calcium content is not less than 96wt% in the calcium core of calcium line；After feeding calcium line, it is further continued for 3 ~ 5min of soft blow argon；
At the end of refining, Si increment≤0.02wt% is controlled, S≤0.006wt%, calcium content is in 15 ~ 35 ppm；
Control white slag performance exist: basicity R in 3.5 ~ 6, slag FeO+MnO in 0.5 ~ 1.2 wt%；
During refining, the control of argon bottom-blowing flow are as follows: the heating period is in 200 ~ 400m3/ min, alloying exist 400~600 m3/ min, the slag making stage is in 600 ~ 800m3/min；
8) conventional to use protective casting at base.
It is: in the smelting of converter, finishing slag basicity R is not less than 2.5, FeO≤16wt%.
Further: when LF furnace the first furnace of refining stage open and is poured, what the calcium line amount of feeding was limited according to calcium constituent The upper limit is controlled.
Further: in casting process, pouring packet tonnage in steel and operated according to not less than 2/3 completely wrapped.
Further: at the end of refining, the basicity R of white slag in 4 ~ 5.5, slag FeO+MnO in 0.7 ~ 1.0 wt%.
The mechanism and effect of several main techniques in the present invention
The present invention is why in LF furnace refines, according to Als the and S content in time phase control molten steel, it may be assumed that
When it is concise to 5min when, control the Als content in molten steel in 450 ~ 700 ppm, S content is no more than 0.020wt%；
When it is concise to 10min when, the Als content in molten steel is no more than 200 ppm, and S content is no more than 0.012wt%；
When it is concise to 20min when, for the Als content in molten steel in 250 ~ 350 ppm, S content is no more than 0.006wt%；
It is primarily due to:
Adjust aluminium to high value in preceding 5min, i.e. Als content is conducive to quickly deeply de- to molten steel, steel slag in 450 ~ 700 ppm Oxygen promotes deoxidation type inclusion polymerization in steel to grow up and be easily removed, if lower than be unfavorable for if 450ppm deoxidation products rapid aggregation, Collision, which is grown up, causes deoxidation to be not thorough；Then it be easy to cause later period Als exceeded higher than 700ppm and SiO2It is largely reduced, increases silicon amount The problems such as uncontrolled；In addition, demands S content is no more than 0.020wt%, corresponding refining initial reduction slag is formed at this time , with certain absorption deoxidation type inclusion ability, steel slag reproducibility is poor if being more than required value is unfavorable for dross inclusion adsorption for it；
When it is concise to 10min when, selection control Als content is conducive within 200 ppm to increasing the effective of silicon amount in steel Control prevents in steel dissolved aluminum to the drastic reduction of silica in slag；In addition, demands S content is no more than 0.012wt%, correspondence refines high alkalinity at this time, the reproducibility slag of good fluidity basically forms, and has stronger absorption deoxidation to be mingled with Object ability.Illustrate that the completion of steel slag deoxidization desulfuration task is not thorough if being more than required value, the later period controlled difficulty of ingredient sulphur is big；
When it is concise to 20min when, selection control Als content is no more than 0.006wt% in 250 ~ 350ppm, S content.Mainly It is to require to select based on the guarantee of steel slag reducing property and the control of product composition dissolved aluminum, ingredient, quality are not easy if control is excessively high It is controlled.
It is due to this patent process major parameter, such as Als, S why in refining stage control Si increment≤0.02wt% Optimal control, steel slag deoxidation depth can be preferably controlled, to avoid the kind composition of steel silicon uncontrolled；Refine later period progress Calcium treatment, and control at the end of refining, calcium content is due to the section calcium content and acid-soluble aluminum content phase in 15 ~ 35 ppm Proportion, is conducive to lower melting point inclusion and is formed.
It is produced at present in the low silicon aluminium killed steel of smelting low carbon in abbreviated system compared with prior art, the present invention solving It is middle to cause that oven improvement is high, ingredient qualification rate is low because of surface quality defect and pour that steel is disconnected to pour the problems such as frequent, make clip surface impurity For defect oven improvement down within 0.4%, ingredient qualification rate is increased to 98.5% or more, pours the disconnected rate of pouring of steel down within 0.4%.
Specific embodiment
The present invention is described in detail below:
Embodiment 1
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:5.2, and blowing magnesium powder speed is 7.3kg/min, and the blowing time is 11min；It is through S in desulfurized molten iron 0.028wt%；
2) it skims, adds in skimming according to 0.25kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area processed is 86%；
3) carry out converter smelting: tapping temperature control is 1675 DEG C；Using slag-stopping tapping, slag thickness is 25mm, steel water oxygen Content is 535ppm；
4) it taps: when 1.5min is arrived in tapping, lime is added according to 2.8kg/ tons of steel；
5) it carries out deoxidation and alloying: aluminium is added according to 2.0kg/ tons of steel, proportionately sets up fixed addition manganese iron separately；
6) into argon station Argon: Argon amount is for 400m3/ min, argon blowing time 8min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 475 ppm, S content is 0.018wt%；
When it is concise to 10min when, for the Als content in molten steel in 198 ppm, S content is 0.011wt%；
When it is concise to 20min when, for the Als content in molten steel in 275 ppm, S content is 0.06wt%；
B, argon flow is adjusted to 30m3/ min, soft argon blowing time is in 8min；
C, carry out Calcium treatment: calcium line feed quantity is that 0.71kg/ tons of steel carry out, and control feeding speed in 3.5m/min；Calcium Calcium content is in 97.5wt% in the calcium core of line；After feeding calcium line, it is further continued for soft blow argon 3.5min；
At the end of refining, Si increment is 0.009wt%, and S content is 0.006wt%, and calcium content is 16 ppm；
Through detect white slag ingredient: basicity R in 6.0, slag FeO+MnO in 1.1wt%；
During refining, argon bottom-blowing flow: the heating period is in 235m3/ min, alloying is in 550 m3/ min, makes The slag stage is in 680m3/min；
8) using protective casting at base.
It is counted, being mingled with oven improvement is 0.29%, and ingredient qualification rate is increased to 100 %, and bleed-out phenomenon does not occur.
Embodiment 2
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:6, and blowing magnesium powder speed is 7.1kg/min, and the blowing time is 13min；It is through S in desulfurized molten iron 0.026wt%；
2) it skims, adds in skimming according to 0.3kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area is 88%；
3) carry out converter smelting: tapping temperature control is 1663 DEG C；Using slag-stopping tapping, slag thickness is 30mm, steel water oxygen Content is 550ppm；
4) it taps: when 1.5min is arrived in tapping, lime is added according to 3kg/ tons of steel；
5) it carries out deoxidation and alloying: aluminium is added according to 2.0kg/ tons of steel, proportionately sets up fixed addition manganese iron separately；
6) into argon station Argon: Argon amount is for 450m3/ min, argon blowing time 7min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 550 ppm, S content is 0.016wt%；
When it is concise to 10min when, for the Als content in molten steel in 155 ppm, S content is 0.010wt%；
When it is concise to 20min when, for the Als content in molten steel in 300 ppm, S content is 0.055wt%；
B, argon flow is adjusted to 30m3/ min, soft argon blowing time is in 9min；
C, carry out Calcium treatment: calcium line feed quantity is that 0.8kg/ tons of steel carry out, and control feeding speed in 3m/min；Calcium line Calcium content is in 97.5wt% in calcium core；After feeding calcium line, it is further continued for soft blow argon 4min；
At the end of refining, Si increment is 0.01wt%, and S content is 0.005wt%, and calcium content is 16 ppm；
Through detect white slag ingredient: basicity R in 5.4, slag FeO+MnO in 0.8 wt%；
During refining, argon bottom-blowing flow: the heating period is in 250m3/ min, alloying is in 600 m3/ min, makes The slag stage is in 750m3/min；
8) using protective casting at base.
It is counted, being mingled with oven improvement is 0%, and ingredient qualification rate is increased to 100 %, and bleed-out phenomenon does not occur.
Embodiment 3
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:6, and blowing magnesium powder speed is 7.2kg/min, and the blowing time is 12min；It is through S in desulfurized molten iron 0.025wt%；
2) it skims, adds in skimming according to 0.25kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area processed is 86%；
3) carry out converter smelting: tapping temperature control is 1671 DEG C；Using slag-stopping tapping, slag thickness is 25mm, steel water oxygen Content is 580ppm；
4) it taps: when 1min is arrived in tapping, lime is added according to 4kg/ tons of steel；
5) it carries out deoxidation and alloying: aluminium is added according to 2.0kg/ tons of steel, proportionately sets up fixed addition manganese iron separately；
6) into argon station Argon: Argon amount is for 600m3/ min, argon blowing time 6min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 600ppm, S content is 0.015wt%；
When it is concise to 10min when, for the Als content in molten steel in 200 ppm, S content is 0.009wt%；
When it is concise to 20min when, for the Als content in molten steel in 281 ppm, S content is 0.004wt%；
B, argon flow is adjusted to 20m3/ min, soft argon blowing time is in 8min；
C, carry out Calcium treatment: calcium line feed quantity is that 0.75kg/ tons of steel carry out, and control feeding speed in 3.5m/min；Calcium Calcium content is in 97.5wt% in the calcium core of line；After feeding calcium line, it is further continued for soft blow argon 5min；
At the end of refining, Si increment is 0.018wt%, and S content is 0.004wt%, and calcium content is 22 ppm；
Through detect white slag ingredient: basicity R in 4.3, slag FeO+MnO in 0.61wt%；
During refining, argon bottom-blowing flow: the heating period is in 300m3/ min, alloying is in 450 m3/ min, makes The slag stage is in 750m3/min；
8) using protective casting at base.
It is counted, being mingled with oven improvement is 0%, and ingredient qualification rate is increased to 100 %, and bleed-out phenomenon does not occur.
Embodiment 4
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:5.5, and blowing magnesium powder speed is 7.4kg/min, and the blowing time is 13min；It is through S in desulfurized molten iron 0.020wt%；
2) it skims, adds in skimming according to 0.3kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area is 90%；
3) carry out converter smelting: tapping temperature control is 1681 DEG C；Using slag-stopping tapping, slag thickness is 20mm, steel water oxygen Content is 598ppm；
4) it taps: when 1min is arrived in tapping, lime is added according to 4kg/ tons of steel；
5) it carries out deoxidation and alloying: aluminium is added according to 2.0kg/ tons of steel, proportionately sets up fixed addition manganese iron separately；
6) into argon station Argon: Argon amount is for 550m3/ min, argon blowing time 7min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 530ppm, S content is 0.017wt%；
When it is concise to 10min when, for the Als content in molten steel in 180 ppm, S content is 0.011wt%；
When it is concise to 20min when, for the Als content in molten steel in 312 ppm, S content is 0.0045wt%；
B, argon flow is adjusted to 20m3/ min, soft argon blowing time is in 10min；
C, carry out Calcium treatment: calcium line feed quantity is that 0.78kg/ tons of steel carry out, and control feeding speed in 3.5m/min；Calcium Calcium content is in 97.5wt% in the calcium core of line；After feeding calcium line, it is further continued for soft blow argon 4min；
At the end of refining, Si increment is 0.015wt%, and S content is 0.0045wt%, and calcium content is 21 ppm；
Through detect white slag ingredient: basicity R in 4.9, slag FeO+MnO in 0.8wt%；
During refining, argon bottom-blowing flow: the heating period is in 290m3/ min, alloying is in 480 m3/ min, makes The slag stage is in 700m3/min；
8) using protective casting at base.
It is counted, being mingled with oven improvement is 0%, and ingredient qualification rate is increased to 100 %, and bleed-out phenomenon does not occur.
Embodiment 5
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:6.5, and blowing magnesium powder speed is 7.2kg/min, and the blowing time is 15min；It is through S in desulfurized molten iron 0.023wt%；
2) it skims, adds in skimming according to 0.4kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area is 90%；
3) carry out converter smelting: tapping temperature control is 1666 DEG C；Using slag-stopping tapping, slag thickness is 25mm, steel water oxygen Content is 575ppm；
4) it taps: when 1.5min is arrived in tapping, lime is added according to 3.5kg/ tons of steel；
5) it carries out deoxidation and alloying: aluminium is added according to 1.8kg/ tons of steel, proportionately sets up fixed addition manganese iron separately；
6) into argon station Argon: Argon amount is for 600m3/ min, argon blowing time 6min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 630ppm, S content is 0.016wt%；
When it is concise to 10min when, for the Als content in molten steel in 108 ppm, S content is 0.012wt%；
When it is concise to 20min when, for the Als content in molten steel in 258ppm, S content is 0.005wt%；
B, argon flow is adjusted to 15m3/ min, soft argon blowing time is in 9min；
C, carry out Calcium treatment: calcium line feed quantity is that 0.65kg/ tons of steel carry out, and control feeding speed in 3.5m/min；Calcium Calcium content is in 97.5wt% in the calcium core of line；After feeding calcium line, it is further continued for soft blow argon 3.5min；
At the end of refining, Si increment is 0.011wt%, and S content is 0.005wt%, calcium content 17ppm；
Through detect white slag ingredient: basicity R in 5.8, slag FeO+MnO in 0.82wt%；
During refining, argon bottom-blowing flow: the heating period is in 350m3/ min, alloying is in 550 m3/ min, makes The slag stage is in 760m3/min；
8) using protective casting at base.
It is counted, being mingled with oven improvement is 0%, and ingredient qualification rate is increased to 100 %, and bleed-out phenomenon does not occur.
Embodiment 6
A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies magnesium and fluid lime Weight ratio is 1:6.3, and blowing magnesium powder speed is 7.1kg/min, and the blowing time is 14min；It is through S in desulfurized molten iron 0.027wt%；
2) it skims, adds in skimming according to 0.3kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area is 90%；
3) carry out converter smelting: tapping temperature control is 1668 DEG C；Using slag-stopping tapping, slag thickness is 28mm, steel water oxygen Content is 530ppm；
4) it taps: when 2min is arrived in tapping, lime is added according to 3.5kg/ tons of steel；
5) it carries out deoxidation and alloying: aluminium is added according to 1.7kg/ tons of steel, proportionately sets up fixed addition manganese iron separately；
6) into argon station Argon: Argon amount is for 700m3/ min, argon blowing time 7min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, control the Als content in molten steel in 590ppm, S content is 0.017wt%；
When it is concise to 10min when, for the Als content in molten steel in 168 ppm, S content is 0.009wt%；
When it is concise to 20min when, for the Als content in molten steel in 310ppm, S content is 0.0038wt%；
B, argon flow is adjusted to 25m3/ min, soft argon blowing time is in 8min；
C, carry out Calcium treatment: calcium line feed quantity is that 0.68kg/ tons of steel carry out, and control feeding speed in 3.5m/min；Calcium Calcium content is in 97.5wt% in the calcium core of line；After feeding calcium line, it is further continued for soft blow argon 4.5min；
At the end of refining, Si increment is 0.017wt%, and S content is 0.004wt%, calcium content 22ppm；
Through detect white slag ingredient: basicity R in 5.3, slag FeO+MnO in 0.78wt%；
During refining, argon bottom-blowing flow: the heating period is in 400m3/ min, alloying is in 600 m3/ min, makes The slag stage is in 780m3/min；
8) using protective casting at base.
It is counted, being mingled with oven improvement is 0%, and ingredient qualification rate is increased to 100 %, and bleed-out phenomenon does not occur.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.

Claims (3)

1. a kind of method in the low silicon aluminium killed steel of CSP producing line smelting low carbon, step:
1) carry out desulfurization to molten iron: period is blown using passivated magnesium and fluid lime, purifies the weight of magnesium and fluid lime Ratio is 1:5 ~ 7, and blowing magnesium powder speed is not less than 7.0kg/min, is blown the time in 10 ~ 15min；Control is through in desulfurized molten iron S≤0.03wt%；
2) it skims, adds in skimming according to 0.2 ~ 0.4kg/ tons of steel and throw dry slag agent, and catch up with slag with slag rifle nitrogen blowing is blown, control Molten iron bare area is not less than 85%；
3) carry out converter smelting: tapping temperature control is being not less than 1660 DEG C；Using slag-stopping tapping, the control of slag thickness is being no more than 30mm, Control for Oxygen Content is in 530 ~ 600ppm in molten steel；
4) it taps: when tapping is to 1 ~ 2min, according to 2.5 ~ 4kg/ ton steel addition lime；
5) it carries out deoxidation and alloying: aluminium is added according to 1.6 ~ 2.0kg/ tons of steel, proportionately set up provisioning request separately and manganese iron is added；
6) into argon station Argon: Argon amount is controlled in 200 ~ 800m3/ min, argon blowing time are no more than 8min；
7) it is refined in LF furnace:
A, according to Als the and S content in time phase control molten steel:
When it is concise to 5min when, the Als content controlled in molten steel is no more than 0.020wt% in 450 ~ 700 ppm, S contents；
When it is concise to 10min when, the Als content in molten steel is no more than 200 ppm, S contents and is no more than 0.012wt%；
When it is concise to 20min when, Als content in molten steel is in 250 ~ 350 ppm, S contents from 0.0038 ~ 0.006wt%；
B, argon flow is adjusted to 10 ~ 50m3/ min, argon blowing time is in 8 ~ 12min；
C, carry out Calcium treatment: calcium line feed quantity is carried out according to 0.61 ~ 0.91kg/ tons of steel, and controls feeding speed in 3 ~ 3.5m/ min；Calcium content is not less than 96wt% in the calcium core of calcium line；After feeding calcium line, it is further continued for 3 ~ 5min of soft blow argon；
At the end of refining, Si increment≤0.02wt% is controlled, S≤0.006wt%, calcium content is in 16 ~ 35 ppm；
Control white slag performance exist: basicity R in 3.5 ~ 6, slag FeO+MnO in 1.1 ~ 1.2 wt%；
During refining, the control of argon bottom-blowing flow are as follows: the heating period is in 200 ~ 400m3/ min, alloying 400 ~ 600 m3/ min, the slag making stage is in 600 ~ 800m3/min；
8) using protective casting at base.
2. a kind of method in the low silicon aluminium killed steel of CSP producing line smelting low carbon as described in claim 1, it is characterised in that: In LF furnace the first furnace of refining stage open when pouring, and the calcium line amount of feeding is controlled according to the upper limit that calcium constituent limits.
3. a kind of method in the low silicon aluminium killed steel of CSP producing line smelting low carbon as described in claim 1, it is characterised in that: In In casting process, pours packet tonnage in steel and operated according to not less than 2/3 completely wrapped.
CN201711134626.1A 2017-11-16 2017-11-16 A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon Active CN107828932B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711134626.1A CN107828932B (en) 2017-11-16 2017-11-16 A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711134626.1A CN107828932B (en) 2017-11-16 2017-11-16 A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon

Publications (2)

Publication Number Publication Date
CN107828932A CN107828932A (en) 2018-03-23
CN107828932B true CN107828932B (en) 2019-11-26

Family

ID=61651847

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711134626.1A Active CN107828932B (en) 2017-11-16 2017-11-16 A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon

Country Status (1)

Country Link
CN (1) CN107828932B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110144433B (en) * 2019-07-03 2021-03-19 马鞍山钢铁股份有限公司 Deoxidation slagging method of low-carbon aluminum killed steel
CN112501488B (en) * 2020-10-22 2021-10-26 福建三宝钢铁有限公司 Preparation process of H08A steel
CN113774189B (en) * 2021-08-25 2022-11-11 武汉钢铁有限公司 Steelmaking method suitable for producing high-strength steel on CSP production line
CN115287401B (en) * 2022-07-19 2023-12-22 山西太钢不锈钢股份有限公司 Smelting method for controlling silicate inclusions in axle steel
CN115652029B (en) * 2022-10-25 2024-01-23 山东钢铁集团日照有限公司 Control method for sulfur content of deep drawing steel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1597998A (en) * 2003-09-17 2005-03-23 首钢总公司 Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster
CN102211155A (en) * 2011-06-01 2011-10-12 武汉钢铁(集团)公司 Calcium treatment method of low-carbon low silicon aluminium killed steels under CSP (Cast Steel Plate) condition
CN102586546A (en) * 2012-03-05 2012-07-18 吉林建龙钢铁有限责任公司 Process for preparing low-carbon low-silicon-aluminium killed steel
CN106957942A (en) * 2017-03-06 2017-07-18 河钢股份有限公司邯郸分公司 A kind of low carbon low silicon aluminium killed steel that improves directly starts to walk to open the method for pouring success rate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1597998A (en) * 2003-09-17 2005-03-23 首钢总公司 Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster
CN102211155A (en) * 2011-06-01 2011-10-12 武汉钢铁(集团)公司 Calcium treatment method of low-carbon low silicon aluminium killed steels under CSP (Cast Steel Plate) condition
CN102586546A (en) * 2012-03-05 2012-07-18 吉林建龙钢铁有限责任公司 Process for preparing low-carbon low-silicon-aluminium killed steel
CN106957942A (en) * 2017-03-06 2017-07-18 河钢股份有限公司邯郸分公司 A kind of low carbon low silicon aluminium killed steel that improves directly starts to walk to open the method for pouring success rate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CSP流程低碳铝镇静钢钙处理优化试验研究;朱万军等;《炼钢》;20151031;第31卷(第5期);第21-26页 *

Also Published As

Publication number Publication date
CN107828932A (en) 2018-03-23

Similar Documents

Publication Publication Date Title
CN107828932B (en) A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon
CN106148844B (en) A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel
CN103060513B (en) Method for smelting tire cord steel and method for continuously casting tire cord steel
CN110229992B (en) Smelting production method of titanium microalloyed low-cost Q355B steel plate
CN104789734B (en) A kind of smelting process of sulfur bearing steel
CN110512051B (en) Rare earth alloying method for avoiding continuous casting nozzle nodulation
CN109252008A (en) A kind of production method of low carbon, low nitrogen ultralow-sulfur steel
CN104862443A (en) Smelting method for low-carbon low-silicon wire-welding steel
CN103334050B (en) Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel
CN104278197B (en) Smelting method of steel for low-silicon high-titanium welding wire
CN103103307B (en) Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter
KR102280717B1 (en) Slag removal method and production method of ultra-low steel production process
CN105483501A (en) Method for smelting phosphorus-containing ultra-low carbon steel
CN110804685A (en) Slag washing and refining process for tapping of converter
CN104789859A (en) Method for producing peritectic steel by using medium-thin slab continuous caster
CN103834848A (en) Steel for boron-containing prestressed steel wires and steel strands and smelting process thereof
CN107201422A (en) A kind of production method of mild steel
CN103074545A (en) High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel
CN111041367B (en) Method for preventing carbon high-silicon low-manganese steel from flocculating in billet
CN110438287A (en) It is a kind of for producing the converter procedure control method of SPHC steel grade
CN115109894B (en) Method for controlling splashing during desilication period of smelting stainless steel
CN114350879B (en) Smelting method of low-carbon ultralow-sulfur pure iron
CN104946852A (en) Efficient desulfuration method for heavy rail steel
CN108456762A (en) The control method of Ds type impurities in a kind of alloy tool steel
CN102962411B (en) Production method of low-carbon and medium-carbon steel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant