CN108396245A - 345 MPa-grade L P steel plate and production method thereof - Google Patents
345 MPa-grade L P steel plate and production method thereof Download PDFInfo
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- CN108396245A CN108396245A CN201710068867.4A CN201710068867A CN108396245A CN 108396245 A CN108396245 A CN 108396245A CN 201710068867 A CN201710068867 A CN 201710068867A CN 108396245 A CN108396245 A CN 108396245A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 153
- 239000010959 steel Substances 0.000 title claims abstract description 153
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 56
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims description 48
- 238000009749 continuous casting Methods 0.000 claims description 23
- 238000005266 casting Methods 0.000 claims description 6
- 239000011819 refractory material Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims 1
- 239000004615 ingredient Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 description 28
- 238000000034 method Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 229910001339 C alloy Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
- B22D11/007—Continuous casting of metals, i.e. casting in indefinite lengths of composite ingots, i.e. two or more molten metals of different compositions being used to integrally cast the ingots
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
the invention relates to a 345 MPa-level L P steel plate and a production method thereof, wherein a L P steel plate is a wedge-shaped steel plate with a thin end and a thick end, the chemical component of the thin end of a L P steel plate is a first chemical component, the chemical component of the thick end of a L P steel plate is a second chemical component, the balance is Fe and inevitable impurities, the chemical component of the middle part of a L P steel plate is transited from the thin end to the thick end from the chemical component to the second chemical component, the yield strength of the L P steel plate is 345-400 MPa, and the impact energy at minus 20 ℃ is more than or equal to 100J.
Description
Technical field
The present invention relates to metallurgical technology field more particularly to a kind of 345MPa grades of LP steel plate and its production methods.
Background technology
LP (longitudinal variable-thickness) steel plate refers to steel plate with special longitudinal shape of the thickness along rolling direction consecutive variations,
It is to change the steel plate of longitudinal thickness by continuously changing the opening degree of roll during the rolling process.Due to longitudinal thickness-variable steel plate
Its thickness can be changed according to load bearing situation, thus the design of the structure sections such as bridge, hull, building can be optimized, no
Can only reduce rolled steel dosage, reduce welding times, and can by the uniform thicknessization of junction improve operability, such as omit backing plate and
Taper WEDM etc..
Application No. is the Chinese patent of CN200910175208.6, a kind of " thickness for rolling wedge-shaped steel plate is disclosed
The operation of rolling of control method ", wedge-shaped steel plate is：Preceding several passages are rolled according to conventional rectangular steel plate rolling technology, extreme trace
It is continuous to change roll gap distance by the control rolling mill hydraulic cylinder oil column height variation of TDC controllers, realize the continuous of steel plate longitudinal thickness
Variation；Since this method is time to roll out lateral wedge-shaped steel plate in the extreme trace of rolling, that is, only completed by a time rolling
The rolling of wedge-shaped steel plate necessarily causes its thickness change range smaller, the poor problem of steel plate template.
Application No. is the Chinese patent of CN201310227028.4, a kind of " transverse wedge-shaped rolled thickness-variable steel plate is disclosed
Production method ", including cross rolling：In transverse rolling stage end passes, set according to steel plate head and tail portion average thickness
Definite value carries out longitudinal variable cross-section rolling to steel plate；Longitudinal rolling；First, it in the axial rolling stage, is generated end to end according to the transverse rolling stage
Longitudinal variable-thickness value carries out lateral equal proportion wedge rolling；Then, it is determined using influence function method according to rolling procedure distribution
Roll gap adjustment amount and bending roller force setting value ensure that the transverse gage distribution of axial rolling passage meets the requirement of equal proportion wedge shape.Due to this
Method is to roll out lateral wedge-shaped steel plate in the extreme trace time setting roll gap parameter of cross rolling, necessarily leads to its thickness change range
Smaller, steel plate template is poor and correction can not be carried out on straightener causes useless plate rate to increase.
Application No. is the Chinese patent of CN200610046457.1, a kind of " continuous rolling side of variable-thickness steel plate is disclosed
Method ", first steel plate respectively reserve certain allowance end to end, and to shut out minimum thickness, rolled piece precomputation is calculated according to rolling force model
Plastic curve determines the roll gap of roll then in conjunction with mill spring curve, is then rolled under the roll gap；It is rolled on head
It calculates in the process and shuts out length, until shutting out length is equal to L；After the completion of the transition stage rolling of head, continues Varying-thickness and roll
System；According to the variation of variable thickness rolled length, roll gap is adjusted correspondingly；The rolling process persistently carries out, until thickeing
Degree section shuts out length and is equal to L, and the thickness of rolled piece has transferred to maximum gauge at this time, carries out tail portion rolling later, based on estimated
Deviation existing for plastic curve and practical plastic curve is calculated, in the operation of rolling of tail portion, according to the practical difference for calculating exit thickness
Not, by adjusting the position of roll gap, tail portion thickness deviation is eliminated, until tail portion rolling is completed.Use the method for the present invention can be with
Conveniently technique continuous rolling variable-thickness steel plate.This method is rolled using segmented, can be caused in actually producing in batches
Low production efficiency controls the disadvantage for stablizing difference.
By being analyzed above it is found that wedge shape LP Plate Productions have following deficiency at present：
1) steel plate thickness variation specification is smaller, narrow application range；
2) use the wedge shape of extreme trace time rolled plate, control accuracy poor；
3) production technology is complicated, low production efficiency, and control stability is poor.
Invention content
The present invention provides a kind of 345MPa grades of LP steel plate and its production methods, using 2 tanks with different chemical composition
Pouring molten steel continuous casting steel billet, and make the continuous casting steel billet chemical composition with even variation along longitudinal direction, continuous casting steel billet is direct through rolling
LP steel plates are produced, and LP steel plates have the characteristics that from thin end to thick end performance uniformity；The overall performance of the LP steel plates is excellent,
Strong applicability.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of 345MPa grades of LP steel plate, the LP steel plates are the wedge-shaped steel plate that one end is thin, one end is thick, the change at the thin end of LP steel plates
It studies and is divided into chemical composition one, weight percent content is：C 0.03~0.06%；Si 0.4~0.6%；Mn 1.00~
1.60%；P≤0.020%；S≤0.015%；V 0.4~0.6%；Als 0.005~0.045%；Remaining is Fe and can not
The impurity avoided；The chemical composition at LP steel plate thickness end is chemical composition two, and weight percent content is：C 0.10~
0.14%；Si 0.20~0.45%；Mn 0.40~0.60%；P≤0.020%；S≤0.015%；Ti 0.01~0.03%；
V 0.6~0.8%；Als 0.005~0.045%；Remaining is Fe and inevitable impurity；In the middle part of LP steel plates chemistry at
Point from thin end to thick end from chemical composition one to two transition of chemical composition；
The yield strength of the LP steel plates is between 345~400MPa, -20 DEG C of ballistic work >=100J.
A kind of production method of 345MPa grades of LP steel plate, which is characterized in that include the following steps：
1) LP steel plates are by continuous casting steel billet roll forming；When continuous casting, using 22 ladle one, ladle ladle cooperations
It pours into a mould, the molten steel in ladle one has chemical composition one, the ladle chemistry two in ladle two, the smelting simultaneously of 2 tank molten steel
Refining, it is consistent with pouring temperature to move out temperature, and wherein pouring temperature is 1530~1550 DEG C；
2) 2 ladles connect mixing of molten steel device by sprue gate respectively, pass through opening for dynamic 2 sprue gates of adjustment
The molten steel flow of the corresponding ladle of degree adjustment；Specially：
When starting cast, first by one corresponding sprue gate of ladle, one standard-sized sheet, 1~3s of cast is corresponding by ladle two
Sprue gate two is opened to minimum aperture；In casting process, the aperture of sprue gate one is by being gradually reduced greatly, until before cast terminates
1~3s is closed；The aperture of sprue gate two is by small gradual increase, until cast terminates preceding 1~3s standard-sized sheets；Ensure steel in casting process
Water total flow meets cast and requires；
3) it is poured into a mould, is obtained from head to tail portion in the molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting steel billet of chemical composition even variation；
4) steel billet is put on the milling train with dynamic adjustment roll gap function and is rolled, obtained from thin end to thick end performance
Uniform LP steel plates.
The sprue gate is slide gate nozzle.
The mixing of molten steel device is tubular mixer, and inner wall sets refractory material layer and inwardly protruded helical form rifling, spiral shell
Rotation shape rifling is structure as a whole with inner wall, is formed by refractory material laying.
Compared with prior art, the beneficial effects of the invention are as follows：
1) by adjusting the chemical composition of LP steel plates longitudinal direction, produced LP steel plates is made to have uniform one from thin end to thick end
The performance of cause, overall performance are better than the same specification LP steel plates with single chemical composition；
2) adjustment chemical composition is poured into a mould continuous casting steel billet by using 2 ladles and is realized, LP steel plates are straight by continuous casting steel billet
It is connected into type, technological process is simple and direct.
Specific implementation mode
A kind of 345MPa grades of LP steel plates of the present invention, the LP steel plates are the wedge-shaped steel plate that one end is thin, one end is thick, LP steel
The chemical composition at the thin end of plate is chemical composition one, and weight percent content is：C 0.03~0.06%；Si 0.4~0.6%；
Mn 1.00~1.60%；P≤0.020%；S≤0.015%；V 0.4~0.6%；Als 0.005~0.045%；Remaining is
Fe and inevitable impurity；The chemical composition at LP steel plate thickness end is chemical composition two, and weight percent content is：C
0.10~0.14%；Si 0.20~0.45%；Mn 0.40~0.60%；P≤0.020%；S≤0.015%；Ti 0.01~
0.03%；V 0.6~0.8%；Als 0.005~0.045%；Remaining is Fe and inevitable impurity；In the middle part of LP steel plates
Chemical composition from thin end to thick end from chemical composition one to two transition of chemical composition；
The yield strength of the LP steel plates is between 345~400MPa, -20 DEG C of ballistic work >=100J.
A kind of production method of 345MPa grades of LP steel plate, which is characterized in that include the following steps：
1) LP steel plates are by continuous casting steel billet roll forming；When continuous casting, using 22 ladle one, ladle ladle cooperations
It pours into a mould, the molten steel in ladle one has chemical composition one, the ladle chemistry two in ladle two, the smelting simultaneously of 2 tank molten steel
Refining, it is consistent with pouring temperature to move out temperature, and wherein pouring temperature is 1530~1550 DEG C；
2) 2 ladles connect mixing of molten steel device by sprue gate respectively, pass through opening for dynamic 2 sprue gates of adjustment
The molten steel flow of the corresponding ladle of degree adjustment；Specially：
When starting cast, first by one corresponding sprue gate of ladle, one standard-sized sheet, 1~3s of cast is corresponding by ladle two
Sprue gate two is opened to minimum aperture；In casting process, the aperture of sprue gate one is by being gradually reduced greatly, until before cast terminates
1~3s is closed；The aperture of sprue gate two is by small gradual increase, until cast terminates preceding 1~3s standard-sized sheets；Ensure steel in casting process
Water total flow meets cast and requires；
3) it is poured into a mould, is obtained from head to tail portion in the molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting steel billet of chemical composition even variation；
4) steel billet is put on the milling train with dynamic adjustment roll gap function and is rolled, obtained from thin end to thick end performance
Uniform LP steel plates.
The sprue gate is slide gate nozzle.
The mixing of molten steel device is tubular mixer, and inner wall sets refractory material layer and inwardly protruded helical form rifling, spiral shell
Rotation shape rifling is structure as a whole with inner wall, is formed by refractory material laying.
The present invention is thin according to LP steel plates, the foundation of thick selection different chemical composition is：
C is the key element for influencing steel plate structure property, its content range is wider in ladle chemistry, and C content is not
With the Different matching relationship of available hardness and toughness, and improve that steel hardness is generally the least expensive, most direct element.But high-carbon
Alloy rigidity is high and toughness is insufficient, is unfavorable for the welding of structural member, and low-carbon alloy toughness is higher and lower hardness.Present invention determine that
It is most suitable for the carbon content 0.03~0.06% at the thin end of LP steel plates, the carbon content 0.10~0.14% at thick end.
Si is the essential elements of deoxidation in steel making, has the function of certain solution strengthening, can also inhibit one-step temper embrittlement,
Improve the temper resistance of martensite, improves temperature, obtain preferable performance.The content range of the thin end Si of LP steel plates of the present invention
For 0.4~0.6%, thick end Si contents 0.20~0.45%.
Mn is the essential element for improving armor plate strength and toughness, can significantly improve the element of steel hardenability, cost is very low
It is honest and clean, it is main adding elements, but the excessively high ductility reductions that can make steel of Mn.Therefore, the thin end Mn contents limit in LP steel plates east of the present invention
1.0~1.60% are scheduled on, thick end Mn contents 0.40~0.60%.
Micro V, Ti can effective crystal grain thinning, improve the obdurability of steel, therefore LP steel plates thickness end V in the present invention
The V 0.4~0.6% at the thin end of 0.6~0.8%, Ti 0.01~0.03%, LP steel plate；
Al is deoxidant element, can be used as AlN formation elements, effectively crystal grain thinning, in order to reach good deoxidation effect
Fruit, ranging from Al0.005~0.045% of Al content in PL steel plates of the present invention.
P, S is harmful element, P≤0.020%, S≤0.015% in PL steel plates in the present invention.
Following embodiment is being implemented down based on the technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
It is conventional method not mentionlet alone bright.
【Embodiment 1】
The chemical composition one of molten steel is in ladle 1：C 0.03%；Si 0.4%；Mn 1.00%；P 0.020%；S
0.015%；V 0.4%；Als 0.005%；Remaining is Fe and inevitable impurity；
The chemical composition two of molten steel is in ladle 2：C 0.10%；Si 0.20%；Mn 0.40%；P 0.020%；S
0.015%；Ti 0.01%；V 0.6%；Als 0.005%；Remaining is Fe and inevitable impurity；
Continuous casting steel billet, the sampled inspection of continuous casting steel billet, head (the thin end of corresponding LP steel plates) are poured into a mould by 2 tank mixing of molten steel
Chemical composition be chemical composition one, the chemical composition of tail portion (corresponding LP steel plate thickness end) is chemical composition two, middle part chemistry at
It is divided into：C 0.06%；Si 0.30%；Mn 0.68%；V 0.52%；Ti 0.005%；Als 0.005%；Remaining for Fe and
Inevitable impurity.
Continuous casting steel billet is rolled to the LP steel plates of wedgewise, thin end thickness 12mm, thick end thickness 30mm, long 24m, LP steel plates
Yield strength from thin end to thick end is between 362~385MPa, -20 DEG C of ballistic work >=120J.
【Embodiment 2】
The chemical composition one of molten steel is in ladle 1：C 0.06%；Si 0.6%；Mn 1.60%；P 0.015%；S
0.010%；V 0.6%；Als 0.045%；Remaining is Fe and inevitable impurity；
The chemical composition two of molten steel is in ladle 2：C 0.14%；Si 0.45%；Mn 0.60%；P 0.015%；S
0.010%；Ti 0.03%；V 0.8%；Als 0.045%；Remaining is Fe and inevitable impurity；
Continuous casting steel billet, the sampled inspection of continuous casting steel billet, head (the thin end of corresponding LP steel plates) are poured into a mould by 2 tank mixing of molten steel
Chemical composition be chemical composition one, the chemical composition of tail portion (corresponding LP steel plate thickness end) is chemical composition two, middle part chemistry at
It is divided into：C 0.10%；Si 0.35%；Mn 1.10%；V 0.7%；Ti 0.015%；Als 0.045%；Remaining is for Fe and not
Evitable impurity.
Continuous casting steel billet is rolled to the LP steel plates of wedgewise, thin end thickness 20mm, thick end thickness 60mm, long 18m, LP steel plates
Yield strength from thin end to thick end is between 358~376MPa, -20 DEG C of ballistic work >=100J.
【Embodiment 3】
The chemical composition one of molten steel is in ladle 1：C 0.05%；Si 0.5%；Mn 1.30%；P 0.010%；S
0.005%；V 0.5%；Als 0.025%；Remaining is Fe and inevitable impurity；
The chemical composition one of molten steel is in ladle 2：C 0.13%；Si 0.35%；Mn 0.50%；P 0.010%；S
0.005%；Ti 0.02%；V 0.8%；Als 0.035%；Remaining is Fe and inevitable impurity；
Continuous casting steel billet, the sampled inspection of continuous casting steel billet, head (the thin end of corresponding LP steel plates) are poured into a mould by 2 tank mixing of molten steel
Chemical composition be chemical composition one, the chemical composition of tail portion (corresponding LP steel plate thickness end) is chemical composition two, middle part chemistry at
It is divided into：C 0.10%；Si 0.43%；Mn 1.06%；V 0.065%；Ti 0.015%；Als 0.030%；Remaining for Fe and
Inevitable impurity.
Continuous casting steel billet is rolled to the LP steel plates of wedgewise, thin end thickness 16mm, thick end thickness 35mm, long 20m, LP steel plates
Yield strength from thin end to thick end is between 355~372MPa, -20 DEG C of ballistic work >=115J.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of 345MPa grades of LP steel plate, which is characterized in that the LP steel plates are the wedge-shaped steel plate that one end is thin, one end is thick, LP steel
The chemical composition at the thin end of plate is chemical composition one, and weight percent content is：C 0.03~0.06%；Si 0.4~0.6%；
Mn 1.00~1.60%；P≤0.020%；S≤0.015%；V 0.4~0.6%；Als 0.005~0.045%；Remaining is
Fe and inevitable impurity；The chemical composition at LP steel plate thickness end is chemical composition two, and weight percent content is：C
0.10~0.14%；Si 0.20~0.45%；Mn 0.40~0.60%；P≤0.020%；S≤0.015%；Ti 0.01~
0.03%；V 0.6~0.8%；Als 0.005~0.045%；Remaining is Fe and inevitable impurity；In the middle part of LP steel plates
Chemical composition from thin end to thick end from chemical composition one to two transition of chemical composition；
The yield strength of the LP steel plates is between 345~400MPa, -20 DEG C of ballistic work >=100J.
2. a kind of production method of 345MPa grades of LP steel plate as described in claim 1, which is characterized in that include the following steps：
1) LP steel plates are by continuous casting steel billet roll forming；When continuous casting, poured into a mould using 22 ladle one, ladle ladle cooperations,
There is molten steel in ladle one chemical composition one, the ladle chemistry two in ladle two, 2 tank molten steel to smelt simultaneously,
It is consistent with pouring temperature to move out temperature, wherein pouring temperature is 1530~1550 DEG C；
2) 2 ladles connect mixing of molten steel device by sprue gate respectively, and the aperture tune of 2 sprue gates is adjusted by dynamic
The molten steel flow of whole corresponding ladle；Specially：
When starting cast, first by one corresponding sprue gate of ladle, one standard-sized sheet, 1~3s is poured into a mould by two corresponding cast of ladle
The mouth of a river two is opened to minimum aperture；In casting process, the aperture of sprue gate one by being gradually reduced greatly, until cast terminate preceding 1~
3s is closed；The aperture of sprue gate two is by small gradual increase, until cast terminates preceding 1~3s standard-sized sheets；Ensure molten steel in casting process
Total flow meets cast and requires；
3) it is poured into a mould, is obtained chemical from head to tail portion in the molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting steel billet of ingredient even variation；
4) steel billet is put on the milling train with dynamic adjustment roll gap function and is rolled, obtained uniform from thin end to thick end performance
Consistent LP steel plates.
3. a kind of production method of 345MPa grades of LP steel plates according to claim 2, which is characterized in that the sprue gate
For slide gate nozzle.
4. a kind of production method of 345MPa grades of LP steel plates according to claim 2, which is characterized in that the mixing of molten steel
Device is tubular mixer, and inner wall sets refractory material layer and inwardly protruded helical form rifling, helical form rifling are integrated with inner wall
Structure is formed by refractory material laying.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710068867.4A CN108396245B (en) | 2017-02-08 | 2017-02-08 | 345 MPa-level LP steel plate and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710068867.4A CN108396245B (en) | 2017-02-08 | 2017-02-08 | 345 MPa-level LP steel plate and production method thereof |
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| CN108396245B CN108396245B (en) | 2019-12-13 |
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