CN110468324A - A kind of cold-heading pours continuous casting producing method with the company of low silicon Aluminum steel - Google Patents
A kind of cold-heading pours continuous casting producing method with the company of low silicon Aluminum steel Download PDFInfo
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- CN110468324A CN110468324A CN201910718193.7A CN201910718193A CN110468324A CN 110468324 A CN110468324 A CN 110468324A CN 201910718193 A CN201910718193 A CN 201910718193A CN 110468324 A CN110468324 A CN 110468324A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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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
- 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
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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
- 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
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- 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
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- 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
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- 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
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Abstract
The invention discloses a kind of cold-headings to pour continuous casting producing method with the company of low silicon Aluminum steel, and the production method includes flowing backward station, converter smelting, the refining of LF furnace, continuous casting working procedure.The present invention adds aluminium shot deoxidation operation by converter tapping, reduces Oxygen Content in Liquid Steel, reduces LF furnace refining process deoxidation dynamics；Synthetic slag is added in converter and lime is added in LF furnace, removes most of field trash, optimizes LF furnace finishing slag component；It is replaced in continuous casting process using atmosphere and carries out molding casting using ladle long nozzle, submersed nozzle.Production method of the present invention, which can be realized, is continuously poured the low silicon Aluminum steel of cold-heading using section 150mm × 150mm square billet, and casting process nozzle clogging situation is not present, and company pours success rate and reaches 100%, continuous casting billet Si≤0.10%；Reduce enterprise and be attached to product amount, reduces production cost, supply in time for client and provide guarantee, meet customer need.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of cold-heading pours continuous casting side with the company of low silicon Aluminum steel
Method.
Background technique
The low silicon Aluminum steel of cold-heading, is limited by properties of product, needs element silicon control lower, while refining using aluminium deoxidation
Crystal grain reaches the requirement for meeting properties of product.
In such product smelting process, since tapping oxygen content is higher, element silicon control is lower, is generally added using tapping
The mode of aluminium carries out deoxidation operation, the Al of generation2O3It is mingled with more, especially the first furnace of continuous casting, due to by Tapping Temperature of Bof
High, oxygen content height, LF furnace refining time is long, slag system is unstable, and continuous casting, which is opened, pours control climate influence, and Chang Fasheng nozzle clogging etc. is raw
Production accident seriously affects steel-making production capacity.
Since Q195 steel grade is compared with the low silicon Aluminum steel such as SWRCH8A, the requirement of no Al content, enterprise is at present in order to guarantee to connect
It pours, first furnace driveaway operation is carried out using the siliceous low aluminum steel kind such as Q195, but since handover heat component difference is larger, need to carry out
Base operation is got rid of, cost is influenced.In addition to first furnace, heat pours by process state modulator de-stabilising effect in company, equally exists casting process
Nozzle clogging situation.
In conclusion solve the steel grade and open the production difficult point for pouring heat by optimized production process, realize cold-heading with low
Production is poured by the company of silicon Aluminum steel, is of great significance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of cold-headings to pour continuous casting producing method with the company of low silicon Aluminum steel.It should
Invention is realized that cold-heading pours steady production with the company of low silicon Aluminum steel, reduces enterprise and be attached to product amount, dropped by optimized production process
Low production cost, supplies in time for client and provides guarantee, meet customer need.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of company of the low silicon Aluminum steel of cold-heading
Continuous casting producing method is poured, the production method includes flowing backward station, converter smelting, the refining of LF furnace, continuous casting working procedure, specific process step
It is as described below:
(1) flow backward station process: flowing backward the molten iron that Iron-smelting transport is carried out at station, be blended into converter, wherein molten iron S≤0.045%；
(2) converter smelting process: molten iron is blended into after converter plus steel scrap is smelted, converter smelting tapping molten steel composition and quality hundred
Divide content are as follows: C≤0.05%, P≤0.025%, S≤0.020%, tapping temperature >=1600 DEG C, oxygen of tapping: 500~1000ppm, out
The steel time >=4min；3~5 ㎏ of synthetic slag/t steel, 1.2~2.5 ㎏ of aluminium shot/t steel, ladle sample is added in tapping process into ladle
Ingredient: C≤0.05%, Si≤0.03%, Mn≤0.35%, P≤0.025%, S≤0.020%, Al >=0.010%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, feeds 1.15~1.60 ㎏ of aluminum steel/t steel, heated
8~11 ㎏ of lime/t steel, 1.0~2.0 ㎏ of fluorite/t steel are added in journey, is warming up to 1610~1640 DEG C；Heating, which finishes, is dipped in
Slag operation stirs 1~3min, and 1~2 ㎏ of lime/t steel is added, and dips in slag again, and clinker is progress thermometric sampling operation after white slag,
Continue heat temperature raising, temperature carries out Calcium treatment operation, molten steel composition and quality percentage before Calcium treatment when reaching 1640~1650 DEG C
Content are as follows: C≤0.07%, Si≤0.10%, Mn:0.30~0.50%, P≤0.025%, S≤0.020%, Al >=0.020%, finishing slag
Component control: FeO≤1.0%, CaO:45~65%, SiO2≤10%、Al2O3: 15~35%, calcium line feed quantity is 0.94~1.26
㎏/t steel, Ca >=0.0025% leaving from station, soft blow operate soft blow time >=10min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap >=2min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting.
Step (2) molten iron of the present invention is blended into after converter plus 0.19~0.27 ㎏ of steel scrap/t steel is smelted, described useless
Steel Cr≤0.30%.
Step (2) synthetic slag component of the present invention are as follows: CaO:40~55%, SiO2≤10%、Al2O3: 25~45%, MgO
≤10%。
The chemical component of the low silicon Aluminum steel continuous casting billet of cold-heading of the present invention forms and its mass percentage are as follows: and C≤
0.08%, Si≤0.10%, Mn:0.30~0.50%, P≤0.025%, S≤0.020%, Al >=0.020%, remaining is Fe and can not
The impurity avoided.
Step (1) of the present invention flows backward station process, flows backward station for Iron-smelting and transports molten iron using fish torpedo ladle mode, presses
It is every to wrap out 115~125t of iron control.
Production method of the present invention, which can be realized, is continuously poured cold-heading with low silicon using section 150mm × 150mm square billet
Aluminum steel, company pour success rate and reach 100%.
The beneficial effects of adopting the technical scheme are that the 1, present invention adds aluminium shot deoxidation to grasp by converter tapping
Make, reduce Oxygen Content in Liquid Steel, reduces LF furnace refining process deoxidation dynamics；Synthetic slag is added in converter and lime, removal is added in LF furnace
Most of field trash optimizes LF furnace finishing slag component；Ladle long nozzle, immersion water are replaced and used in continuous casting process using atmosphere
Mouth carries out molding casting, realizes that cold-heading pours steady production with the company of low silicon Aluminum steel.2, the present invention solves first furnace using Q195
Driveaway operation is carried out etc. siliceous low aluminum steel kind, the problem of getting rid of base operation is carried out since handover heat component difference is larger, reduces
Product amount is attached to by enterprise, reduces production cost, supplies in time for client and provides guarantee, meets customer need.2, the present invention is cold
Low silicon Aluminum steel continuous casting billet Si≤0.10% of upsetting, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, chemical component composition and mass percentage are shown in Table 1, life
Production method includes flowing backward station, converter smelting, the refining of LF furnace, continuous casting working procedure, and specific process step is as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 124t by every
Control, is blended into converter, wherein molten iron S:0.039%；
(2) converter smelting process: molten iron is blended into after converter plus 0.22 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.05%, P:0.005%, S:0.020%, 1627 DEG C of tapping temperature, oxygen of tapping: 660ppm, tapping
Time 4.5min；3.46 ㎏ of synthetic slag/t steel, 1.92 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient:
C:0.039%, Si:0.02%, Mn:0.25%, P:0.007%, S:0.019%, Al:0.045%；The synthetic slag component are as follows: CaO:
41%、SiO2: 9%, Al2O3: 27%, MgO:9%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.52 ㎏ of aluminum steel/t steel, is added in heating process
Enter 8.9 ㎏ of lime/t steel, 1.0 ㎏ of fluorite/t steel, is warming up to 1621 DEG C；Heating, which finishes, dip in slag operation, the green slag of clinker glass,
1.5min is stirred, thermometric, sampling are added 1.0 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches 1642
DEG C when carry out Calcium treatment operation, molten steel composition mass percentage before Calcium treatment are as follows: C:0.06%, Si:0.08%, Mn:0.41%,
P:0.008%, S:0.002%, Al:0.029%, finishing slag component control: FeO:0.9%, CaO:52%, SiO2: 8%, Al2O3: 21%, calcium
Line feed quantity is 1.03 ㎏/t steel, Ca:0.0039% leaving from station, soft blow operation soft blow time 20min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 3min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole process protection using ladle long nozzle and submersed nozzle
Casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 2
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, chemical component composition and mass percentage are shown in Table 1, life
Production method includes flowing backward station, converter smelting, the refining of LF furnace, continuous casting working procedure, and specific process step is as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 122t by every
Control, is blended into converter, wherein molten iron S:0.030%；
(2) converter smelting process: molten iron is blended into after converter plus 0.23 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.03%, P:0.012%, S:0.020%, 1640 DEG C of tapping temperature, oxygen of tapping: 830ppm, tapping
Time 5min；3.8 ㎏ of synthetic slag/t steel, 2.2 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient: C:
0.030%, Si:0.02%, Mn:0.24%, P:0.012%, S:0.018%, Al:0.051%；The synthetic slag component are as follows: CaO:
45%、SiO2: 8%, Al2O3: 35%, MgO:8%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.48 ㎏ of aluminum steel/t steel, is added in heating process
Enter 8.45 ㎏ of lime/t steel, 1.1 ㎏ of fluorite/t steel, is warming up to 1615 DEG C；Heating, which finishes, to be carried out dipping in slag operation, and clinker glass is white
Slag stirs 1.0min, and thermometric, sampling are added 1.3 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches
Calcium treatment operation is carried out at 1640 DEG C, molten steel composition mass percentage before Calcium treatment are as follows: C:0.07%, Si:0.07%, Mn:
0.42%, P:0.014%, S:0.002%, Al:0.033%, finishing slag component control: FeO:0.5%, CaO:50%, SiO2: 7%, Al2O3:
20%, calcium line feed quantity is 1.15 ㎏/t steel, Ca:0.0044% leaving from station, soft blow operation soft blow time 18min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 3.3min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 3
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, chemical component composition and mass percentage are shown in Table 1, life
Production method includes flowing backward station, converter smelting, the refining of LF furnace, continuous casting working procedure, and specific process step is as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 120t by every
Control, is blended into converter, wherein molten iron S:0.035%；
(2) converter smelting process: molten iron is blended into after converter plus 0.20 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.05%, P:0.016%, S:0.020%, 1608 DEG C of tapping temperature, oxygen of tapping: 500ppm, tapping
Time 4.6min；3.5 ㎏ of synthetic slag/t steel, 1.98 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient: C:
0.036%, Si:0.01%, Mn:0.27%, P:0.011%, S:0.015%, Al:0.043%；The synthetic slag component are as follows: CaO:
50%、SiO2: 5%, Al2O3: 40%, MgO:7%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.59 ㎏ of aluminum steel/t steel, is added in heating process
Enter 8.63 ㎏ of lime/t steel, 1.3 ㎏ of fluorite/t steel, is warming up to 1620 DEG C；Heating, which finishes, dip in slag operation, the blackish green slag of clinker,
2.8min is stirred, thermometric, sampling are added 1.1 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches 1647
DEG C when carry out Calcium treatment operation, molten steel composition mass percentage before Calcium treatment are as follows: C:0.06%, Si:0.06%, Mn:0.45%,
P:0.014%, S:0.002%, Al:0.035%, finishing slag component control: FeO:0.56%, CaO:58%, SiO2: 6.7%, Al2O3:
23%, calcium line feed quantity is 1.16 ㎏/t steel, Ca:0.0045% leaving from station, soft blow operation soft blow time 20min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 2.9min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 4
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, production method include flow backward station, converter smelting, LF furnace refine,
Continuous casting working procedure, specific process step are as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 118t by every
Control, is blended into converter, wherein molten iron S:0.042%；
(2) converter smelting process: molten iron is blended into after converter plus 0.25 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.04%, P:0.022%, S:0.017%, 1600 DEG C of tapping temperature, oxygen of tapping: 1000ppm, tapping
Time 4.2min；3.62 ㎏ of synthetic slag/t steel, 1.38 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient:
C:0.045%, Si:0.022%, Mn:0.32%, P:0.021%, S:0.013%, Al:0.048%；The synthetic slag component are as follows: CaO:
48%、SiO2: 6%, Al2O3: 37%, MgO:5%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.53 ㎏ of aluminum steel/t steel, is added in heating process
Enter 9.72 ㎏ of lime/t steel, 1.65 ㎏ of fluorite/t steel, is warming up to 1637 DEG C；Heating, which finishes, dip in slag operation, the blackish green slag of clinker,
2.2min is stirred, thermometric, sampling operation are added 1.1 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches
Calcium treatment operation is carried out at 1645 DEG C, molten steel composition mass percentage before Calcium treatment are as follows: C:0.05%, Si:0.09%, Mn:
0.36%, P:0.019%, S:0.015%, Al:0.024%, finishing slag component control: FeO:0.73%, CaO:55%, SiO2: 7.5%,
Al2O3: 17%, calcium line feed quantity is 1.03 ㎏/t steel, Ca:0.0032% leaving from station, soft blow operation soft blow time 16min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 2.5min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 5
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, production method include flow backward station, converter smelting, LF furnace refine,
Continuous casting working procedure, specific process step are as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 116t by every
Control, is blended into converter, wherein molten iron S:0.032%；
(2) converter smelting process: molten iron is blended into after converter plus 0.26 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.035%, P:0.020%, S:0.015%, 1625 DEG C of tapping temperature, oxygen of tapping: 750ppm, tapping
Time 4.7min；4.56 ㎏ of synthetic slag/t steel, 2.35 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient:
C:0.032%, Si:0.027%, Mn:0.26%, P:0.015%, S:0.017%, Al:0.025%；The synthetic slag component are as follows: CaO:
51%、SiO2: 9%, Al2O3: 30%, MgO:8.5%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.58 ㎏ of aluminum steel/t steel, is added in heating process
Enter 10.85 ㎏ of lime/t steel, 1.45 ㎏ of fluorite/t steel, is warming up to 1617 DEG C；Heating, which finishes, to be carried out dipping in slag operation, and clinker glass is green
Slag stirs 2.5min, and thermometric, sampling operation are added 1.8 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches
Calcium treatment operation, molten steel composition mass percentage before Calcium treatment are carried out when to 1645 DEG C are as follows: C:0.055%, Si:0.084%,
Mn:0.32%, P:0.010%, S:0.010%, Al:0.022%, finishing slag component control: FeO:0.62%, CaO:54%, SiO2:
8.8%、Al2O3: 19%, calcium line feed quantity is 0.99 ㎏/t steel, Ca:0.0027% leaving from station, soft blow operation soft blow time 12min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 2.3min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 6
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, production method include flow backward station, converter smelting, LF furnace refine,
Continuous casting working procedure, specific process step are as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 118t by every
Control, is blended into converter, wherein molten iron S:0.037%；
(2) converter smelting process: molten iron is blended into after converter plus 0.20 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.045%, P:0.023%, S:0.019%, 1610 DEG C of tapping temperature, oxygen of tapping: 580ppm, tapping
Time 4.8min；4.25 ㎏ of synthetic slag/t steel, 1.55 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient:
C:0.042%, Si:0.015%, Mn:0.30%, P:0.018%, S:0.012%, Al:0.034%；The synthetic slag component are as follows: CaO:
43%、SiO2: 8%, Al2O3: 41%, MgO:7.2%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.56 ㎏ of aluminum steel/t steel, is added in heating process
Enter 9.35 ㎏ of lime/t steel, 1.24 ㎏ of fluorite/t steel, is warming up to 1632 DEG C；Heating, which finishes, to be carried out dipping in slag operation, and clinker glass is white
Slag stirs 1.8min, and thermometric, sampling operation are added 1.0 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches
Calcium treatment operation, molten steel composition mass percentage before Calcium treatment are carried out when to 1646 DEG C are as follows: C:0.063%, Si:0.065%,
Mn:0.48%, P:0.022%, S:0.012%, Al:0.027%, finishing slag component control: FeO:0.84%, CaO:47%, SiO2:
9.5%、Al2O3: 32%, calcium line feed quantity is 1.13 ㎏/t steel, Ca:0.0030% leaving from station, soft blow operation soft blow time 15min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 2.1min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 7
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, production method include flow backward station, converter smelting, LF furnace refine,
Continuous casting working procedure, specific process step are as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 125t by every
Control, is blended into converter, wherein molten iron S:0.033%；
(2) converter smelting process: molten iron is blended into after converter plus 0.27 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.042%, P:0.018%, S:0.012%, 1620 DEG C of tapping temperature, oxygen of tapping: 920ppm, tapping
Time 4.3min；3.0 ㎏ of synthetic slag/t steel, 2.5 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient: C:
0.032%, Si:0.018%, Mn:0.29%, P:0.017%, S:0.011%, Al:0.015%；The synthetic slag component are as follows: CaO:
40%、SiO2: 10%, Al2O3: 45%, MgO:6%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.60 ㎏ of aluminum steel/t steel, is added in heating process
Enter 8.0 ㎏ of lime/t steel, 2.0 ㎏ of fluorite/t steel, is warming up to 1610 DEG C；Heating, which finishes, dip in slag operation, and the blackish green slag of clinker stirs
3.0min is mixed, thermometric, sampling operation are added 1.2 ㎏ of lime/t steel and carry out white slag holding, continue heating and rise according to rhythm control
Temperature, temperature carry out Calcium treatment operation when reaching 1648 DEG C, molten steel composition mass percentage before Calcium treatment are as follows: C:0.067%, Si:
0.072%, Mn:0.30%, P:0.015%, S:0.016%, Al:0.030%, the control of finishing slag component: FeO:0.93%, CaO:65%,
SiO2: 9.0%, Al2O3: 15%, calcium line feed quantity is 1.26 ㎏/t steel, Ca:0.0040% leaving from station, soft blow operation soft blow time
13min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 3.5min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
Embodiment 8
The low silicon Aluminum steel steel grade SWRCH8A of the present embodiment cold-heading, production method include flow backward station, converter smelting, LF furnace refine,
Continuous casting working procedure, specific process step are as described below:
(1) flow backward station process: flow backward station by Iron-smelting using fish torpedo ladle mode transport come molten iron, wrap out iron 115t by every
Control, is blended into converter, wherein molten iron S:0.045%；
(2) converter smelting process: molten iron is blended into after converter plus 0.19 ㎏ of steel scrap/t steel is smelted, converter smelting tap molten steel at
Divide mass percentage are as follows: C:0.046%, P:0.025%, S:0.015%, 1650 DEG C of tapping temperature, oxygen of tapping: 700ppm, tapping
Time 4.0min；5.0 ㎏ of synthetic slag/t steel, 1.2 ㎏ of aluminium shot/t steel is added in tapping process into ladle, ladle sample ingredient: C:
0.050%, Si:0.030%, Mn:0.35%, P:0.025%, S:0.020%, Al:0.010%；The synthetic slag component are as follows: CaO:
55%、SiO2: 7%, Al2O3: 25%, MgO:10%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, is fed 1.15 ㎏ of aluminum steel/t steel, is added in heating process
Enter 11 ㎏ of lime/t steel, 1.0 ㎏ of fluorite/t steel, is warming up to 1640 DEG C；Heating, which finishes, dip in slag operation, clinker glass white slag,
2.0min is stirred, thermometric, sampling operation are added 2.0 ㎏ of lime/t steel and carry out white slag holding, continue heat temperature raising, and temperature reaches
Calcium treatment operation is carried out at 1650 DEG C, molten steel composition mass percentage before Calcium treatment are as follows: C:0.057%, Si:0.10%, Mn:
0.50%, P:0.025%, S:0.020%, Al:0.020%, finishing slag component control: FeO:1.0%, CaO:45%, SiO2: 10.0%,
Al2O3: 35%, calcium line feed quantity is 1.03 ㎏/t steel, Ca:0.0025% leaving from station, soft blow operation soft blow time 10min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap 2.0min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting；The chemical component of continuous casting billet forms and its mass percentage is shown in Table 1.
The present embodiment cold-heading can be realized with the production method of low silicon Aluminum steel to be connected using section 150mm × 150mm square billet
The continuous casting low silicon Aluminum steel SWRCH8A of cold-heading, is not present casting process nozzle clogging situation, and company pours success rate and reaches 100%.
The chemical component of the low silicon Aluminum steel continuous casting billet of 1 embodiment 1-8 cold-heading of table forms
And its mass percentage (%)
Ingredient surplus is Fe and inevitable impurity in table 1.
Above-described embodiment solves first furnace and carries out driveaway operation using the siliceous low aluminum steel kind such as Q195, due to handover heat at
Divide the problem of get rid of base operation that differ greatly, casting process nozzle clogging situation is not present, company pours success rate and reaches 100%, subtracts
Product amount is attached to by Shao Liao enterprise, reduces production cost, supplies in time for client and provides guarantee, meets customer need.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (6)
1. a kind of cold-heading pours continuous casting producing method with the company of low silicon Aluminum steel, which is characterized in that the production method includes flowing backward
It stands, the refining of converter smelting, LF furnace, continuous casting working procedure, specific process step is as described below:
(1) flow backward station process: flowing backward the molten iron that Iron-smelting transport is carried out at station, be blended into converter, wherein molten iron S≤0.045%；
(2) converter smelting process: molten iron is blended into after converter plus steel scrap is smelted, converter smelting tapping molten steel composition and quality hundred
Divide content are as follows: C≤0.05%, P≤0.025%, S≤0.020%, tapping temperature >=1600 DEG C, oxygen of tapping: 500~1000ppm, out
The steel time >=4min；3~5 ㎏ of synthetic slag/t steel, 1.2~2.5 ㎏ of aluminium shot/t steel, ladle sample is added in tapping process into ladle
Ingredient: C≤0.05%, Si≤0.03%, Mn≤0.35%, P≤0.025%, S≤0.020%, Al >=0.010%；
(3) LF furnace refining procedure: molten steel is refined into LF furnace after converter tapping, feeds 1.15~1.60 ㎏ of aluminum steel/t steel, heated
8~11 ㎏ of lime/t steel, 1.0~2.0 ㎏ of fluorite/t steel are added in journey, is warming up to 1610~1640 DEG C；Heating, which finishes, is dipped in
Slag operation stirs 1~3min, and 1~2 ㎏ of lime/t steel is added, and dips in slag again, and clinker is progress thermometric sampling operation after white slag,
Continue heat temperature raising, temperature carries out Calcium treatment operation, molten steel composition and quality percentage before Calcium treatment when reaching 1640~1650 DEG C
Content are as follows: C≤0.07%, Si≤0.10%, Mn:0.30~0.50%, P≤0.025%, S≤0.020%, Al >=0.020%, finishing slag
Component control: FeO≤1.0%, CaO:45~65%, SiO2≤10%、Al2O3: 15~35%, calcium line feed quantity is 0.94~1.26
㎏/t steel, Ca >=0.0025% leaving from station, soft blow operate soft blow time >=10min；
(4) continuous casting working procedure: the outbound molten steel of LF furnace is hung to conticaster, and middle hired car carries out atmosphere using argon gas after opening to casting position and sets
It changes, time swap >=2min, ladle, which is opened, after atmosphere replacement completion pours, and carries out whole guarantor using ladle long nozzle and submersed nozzle
Shield casting.
2. a kind of cold-heading according to claim 1 pours continuous casting producing method with the company of low silicon Aluminum steel, which is characterized in that institute
Stating after step (2) molten iron is blended into converter adds 0.19~0.27 ㎏ of steel scrap/t steel to be smelted, steel scrap Cr≤0.30%.
3. a kind of cold-heading according to claim 1 pours continuous casting producing method with the company of low silicon Aluminum steel, which is characterized in that institute
State step (2) synthetic slag component are as follows: CaO:40~55%, SiO2≤10%、Al2O3: 25~45%, MgO≤10%.
4. a kind of cold-heading according to claim 1 to 3 pours continuous casting producing method with the company of low silicon Aluminum steel,
It is characterized in that, the chemical component composition and its mass percentage of the low silicon Aluminum steel continuous casting billet of the cold-heading are as follows: C≤0.08%,
Si≤0.10%, Mn:0.30~0.50%, P≤0.025%, S≤0.020%, Al >=0.020%, remaining is for Fe and inevitably
Impurity.
5. a kind of cold-heading according to claim 1 to 3 pours continuous casting producing method with the company of low silicon Aluminum steel,
It is characterized in that, the step (1) flows backward station process, flows backward station for Iron-smelting and transports molten iron using fish torpedo ladle mode, by every packet
115~125t of iron is controlled out.
6. a kind of cold-heading according to claim 1 to 3 pours continuous casting producing method with the company of low silicon Aluminum steel,
It is characterized in that, the production method, which can be realized, is continuously poured cold-heading with low silicon containing aluminium using section 150mm × 150mm square billet
Steel, company pour success rate and reach 100%.
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