CN108393353B - A kind of production method of LP steel plate - Google Patents
A kind of production method of LP steel plate Download PDFInfo
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- CN108393353B CN108393353B CN201710068859.XA CN201710068859A CN108393353B CN 108393353 B CN108393353 B CN 108393353B CN 201710068859 A CN201710068859 A CN 201710068859A CN 108393353 B CN108393353 B CN 108393353B
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- molten steel
- steel plate
- steel
- sprue gate
- casting
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- 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
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The present invention relates to a kind of production methods of LP steel plate, comprising: 1) according to the longitudinal section shape and Structural strength calls of LP steel plate, using the pouring molten steel continuous casting billet with different chemical composition；2) using 2 ladle casting, 2 tank molten steel are smelted simultaneously, and it is consistent with pouring temperature to move out temperature；3) 2 tank molten steel connect mixing of molten steel device by sprue gate respectively, and dynamic adjusts the molten steel flow of 2 sprue gates as needed；4) it casts in the molten steel injection crystallizer in mixing of molten steel device after evenly mixing, obtains the continuous casting material from head to tail portion chemical component even variation；5) LP steel plate is rolled on the milling train with dynamic adjustment roll gap function.Present invention LP steel plate produced has the uniform characteristic of longitudinal mechanical performance, is conducive to structure design and integral strength stability；The method that direct hot rolling can be used in LP steel plate is produced, and LP Plate Production technique is simplified.
Description
Technical field
The present invention relates to technical field of metal material preparation more particularly to a kind of uniform LP steel of longitudinal mechanical performance
The production method of plate.
Background technique
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..
The continuous casting billet of rolling LP steel plate is using conventional continuous casting billet at present, and when rolling passes through hydraulic system dynamic adjustment
Rolling mill screw down, the steel plate to roll out the steel plate of longitudinal variable-thickness, but after rolling are different thick because plate thickness differs greatly
The plate property for spending section is also different, therefore not can guarantee whole service performance, be not able to satisfy actual operation requirements or can not reach
It is that structure designer is undesirable to optimal use state.
Application No. is the Chinese patent of CN200910175208.6, a kind of " thickness for rolling wedge-shaped steel plate is disclosed
Control method ", the operation of rolling are that preceding several passages are rolled according to conventional rectangular steel plate rolling technology, and extreme trace is controlled by TDC
Device controls the variation of rolling mill hydraulic cylinder oil column height, continuous to change roll gap distance, realizes the consecutive variations of steel plate longitudinal thickness, due to
This method is time to roll out lateral wedge-shaped steel plate in the extreme trace of rolling, that is, only complete wedge-shaped steel plate by a time rolling
Rolling, 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；Firstly, being generated end to end in the axial rolling stage according to the transverse rolling stage
Longitudinal variable-thickness value carries out lateral equal proportion wedge rolling；Then, it is determined according to rolling procedure distribution using influence function method
Roll gap adjustment amount and bending roller force setting value guarantee 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, to shut out minimum thickness, calculate rolled piece precomputation 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 equal to L；After the completion of the rolling of head transition stage, 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 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, will lead in actually batch production
Production efficiency is low, controls the disadvantage for stablizing difference.
By being analyzed above it is found that spy's thickness LP Plate Production has the following deficiencies at present:
1) with thickness change performance corresponding change also occurs for LP steel plate, is unfavorable for structure design；
2) using the wedge shape of last passes LP steel plate, control precision is poor；
3) production technology is complicated, and production efficiency is low, and control stability is poor.
Summary of the invention
The present invention provides a kind of production method of LP steel plate, LP steel plate produced has longitudinal mechanical performance uniform one
The characteristic of cause is conducive to structure design and integral strength stability；The method that direct hot rolling can be used in LP steel plate is produced, letter
LP Plate Production technique is changed.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of production method of LP steel plate, the thick end of the LP steel plate and thin end yield strength difference≤30MPa；It is produced
Method includes the following steps:
1) according to the longitudinal section shape and Structural strength calls of LP steel plate, thin, the thick position of corresponding LP steel plate is adopted respectively
With the pouring molten steel continuous casting billet with different chemical composition；
2) using the casting of 2 ladles, in 2 ladles, the chemical component of molten steel is respectively corresponded meet rolling after LP steel plate
The intensity requirement at thick end and thin end；2 tank molten steel are smelted simultaneously, and it is consistent with pouring temperature to move out temperature；
3) 2 tank molten steel connect mixing of molten steel device by sprue gate respectively, and dynamic adjusts 2 sprue gates as needed
Molten steel flow, specifically: when starting casting, first by corresponding one standard-sized sheet of sprue gate of ladle one, 1~3s is poured by ladle
Two corresponding sprue gates two are opened to minimum aperture；In casting process, the aperture of sprue gate one is by being gradually reduced greatly, until pouring
Note terminates preceding 1~3s and closes；The aperture of sprue gate two is gradually increased by small, until casting terminates preceding 1~3s standard-sized sheet；Casting process
Middle guarantee molten steel total flow meets casting and requires；
4) it casts, 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 material of chemical component even variation；
5) LP steel plate is rolled on the milling train with dynamic adjustment roll gap function.
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 present invention are:
1) LP steel plate produced has the uniform characteristic of longitudinal mechanical performance, is conducive to structure design and entirety is strong
Spend stability；
2) method that direct hot rolling can be used in LP steel plate is produced, and simplifies LP Plate Production technique.
Detailed description of the invention
Fig. 1 is the schematic illustration that continuous casting billet is poured in the production method of LP steel plate of the present invention.
In figure: 1. ladle, 2. sprue gate, 3. mixing of molten steel device, 4. crystallizer
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
A kind of production method of LP steel plate of the present invention, the thick end of the LP steel plate and thin end yield strength difference≤
30MPa；Its production method includes the following steps:
1) according to the longitudinal section shape and Structural strength calls of LP steel plate, thin, the thick position of corresponding LP steel plate is adopted respectively
With the pouring molten steel continuous casting billet with different chemical composition；
2) be poured using 2 ladles 1, the chemical component of molten steel respectively corresponds in 2 ladles 1 meet rolling after LP steel
The intensity requirement at plate thickness end and thin end；2 tank molten steel are smelted simultaneously, and it is consistent with pouring temperature to move out temperature；
3) 2 tank molten steel pass through the connection mixing of molten steel device 3 of sprue gate 2 respectively, and dynamic adjusts 2 sprue gates as needed
2 molten steel flow, specifically: when starting casting, first by corresponding one standard-sized sheet of sprue gate of ladle one, 1~3s is poured by steel
The corresponding sprue gate two of water pot two is opened to minimum aperture；In casting process, the aperture of sprue gate one by being gradually reduced greatly,
Terminate preceding 1~3s to casting to close；The aperture of sprue gate two is gradually increased by small, until casting terminates preceding 1~3s standard-sized sheet；Casting
Guarantee that molten steel total flow meets casting and requires in the process；
4) it casts, is obtained from head to tail in the molten steel injection crystallizer 4 in mixing of molten steel device 3 after evenly mixing
The continuous casting material of portion's chemical component even variation；
5) LP steel plate is rolled on the milling train with dynamic adjustment roll gap function.
The sprue gate 2 is slide gate nozzle.
The mixing of molten steel device 3 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.
Following embodiment is implemented under the premise of the technical scheme 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
Not mentionleting alone bright is conventional method.
[embodiment 1]
The present embodiment produces wedge shape LP steel plate, and the continuous casting billet for rolling LP steel plate is poured using 2 ladles,
In:
The chemical component of molten steel in ladle 1: C0.06%, Si0.35%, Mn0.15%, remaining is for Fe and unavoidably
Impurity；
The chemical component of molten steel in ladle 2: C0.14%, Si0.25%, Mn0.13%, V0.06%, remaining for Fe and
Inevitable impurity；
2 tank molten steel connect mixing of molten steel device by sprue gate respectively, and dynamic adjusts the molten steel flow of 2 sprue gates,
It casts, obtains equal from head to tail portion chemical component in molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting billet of even variation；
It is longitudinal in the difference inspection by sampling of its head, middle part and tail portion, continuous casting billet head sample point chemical component along continuous casting billet
Identical as ladle chemistry in ladle 1, tail portion sample point chemical component is identical as ladle chemistry in ladle 2, in
Portion's sample point chemical component are as follows: C0.1%, Si0.30%, Mn0.14%, V0.03%, remaining is Fe and inevitable impurity.
The rolling wedge-shaped LP steel plate on the milling train with dynamic adjustment roll gap function, thin end thickness 40mm, thick end thickness
80mm, long 15m, the yield strength of wedge-shaped LP steel plate along longitudinal direction are 358~377Mpa.
[embodiment 2]
The present embodiment produces wedge shape LP steel plate, and the continuous casting billet for rolling LP steel plate is poured using 2 ladles,
In:
The chemical component of molten steel in ladle 1: C0.04%, Si0.35%, Mn0.14%, remaining is for Fe and unavoidably
Impurity；
The chemical component of molten steel in ladle 2: C0.16%, Si0.35%, Mn0.12%, V0.06%, remaining for Fe and
Inevitable impurity；
2 tank molten steel connect mixing of molten steel device by sprue gate respectively, and dynamic adjusts the molten steel flow of 2 sprue gates,
It casts, obtains equal from head to tail portion chemical component in molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting billet of even variation；
It is longitudinal in the difference inspection by sampling of its head, middle part and tail portion, continuous casting billet head sample point chemical component along continuous casting billet
Identical as ladle chemistry in ladle 1, tail portion sample point chemical component is identical as ladle chemistry in ladle 2, in
Portion's sample point chemical component are as follows: the chemical component of middle part sample point are as follows: C0.1%, Si0.35%, Mn0.13%, V0.03%,
Remaining is Fe and inevitable impurity.
The rolling wedge-shaped LP steel plate on the milling train with dynamic adjustment roll gap function, thin end thickness 20mm, thick end thickness
60mm, long 22m, the yield strength of wedge-shaped LP steel plate along longitudinal direction are 375~382Mpa.
[embodiment 3]
The present embodiment produces wedge shape LP steel plate, and the continuous casting billet for rolling LP steel plate is poured using 2 ladles,
In:
The chemical component of molten steel in ladle 1: C0.12%, Si0.25%, Mn0.15%, remaining is for Fe and unavoidably
Impurity；
The chemical component of molten steel in ladle 2: C0.14%, Si0.25%, Mn0.13%, Nb0.04%, V0.06%,
Remaining is Fe and inevitable impurity；
2 tank molten steel connect mixing of molten steel device by sprue gate respectively, and dynamic adjusts the molten steel flow of 2 sprue gates,
It casts, obtains equal from head to tail portion chemical component in molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting billet of even variation；
It is longitudinal in the difference inspection by sampling of its head, middle part and tail portion, continuous casting billet head sample point chemical component along continuous casting billet
Identical as ladle chemistry in ladle 1, tail portion sample point chemical component is identical as ladle chemistry in ladle 2, in
Portion's sample point chemical component are as follows: the chemical component of middle part sample point are as follows: C0.13%, Si0.25%, Mn0.14%, Nb0.02%,
V0.03%, remaining is Fe and inevitable impurity.
The rolling wedge-shaped LP steel plate on the milling train with dynamic adjustment roll gap function, thin end thickness 80mm, thick end thickness
1100mm, long 110m, the yield strength of wedge-shaped LP steel plate along longitudinal direction are 352~368Mpa.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone 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 (2)
1. a kind of production method of LP steel plate, which is characterized in that the thick end of the LP steel plate and thin end yield strength difference≤
30MPa；Its production method includes the following steps:
1) according to the longitudinal section shape and Structural strength calls of LP steel plate, tool is respectively adopted in thin, the thick position of corresponding LP steel plate
There is the pouring molten steel continuous casting billet of different chemical composition；
2) using the casting of 2 ladles, in 2 ladles, the chemical component of molten steel is respectively corresponded meet rolling after LP steel plate thickness end
With the intensity requirement at thin end；2 tank molten steel are smelted simultaneously, and it is consistent with pouring temperature to move out temperature；
3) 2 tank molten steel pass through sprue gate one respectively, sprue gate two connects mixing of molten steel device, and the mixing of molten steel device is tubulose
Mixer, inner wall set refractory material layer and inwardly protruded helical form rifling, and helical form rifling is structure as a whole with inner wall, by resistance to
Fiery material builds to be formed；
The molten steel flow of dynamic adjustment sprue gate one, sprue gate two as needed, specifically: when starting casting, first by steel
Corresponding one standard-sized sheet of sprue gate of water pot one is poured 1~3s for the corresponding sprue gate two of ladle two and is opened to minimum aperture；
In casting process, the aperture of sprue gate one is closed by being gradually reduced greatly until casting terminates preceding 1~3s；Sprue gate two is opened
Degree is gradually increased by small, until casting terminates preceding 1~3s standard-sized sheet；Guarantee that molten steel total flow meets casting and requires in casting process；
4) it casts, obtains chemical from head to tail portion in the molten steel injection crystallizer in mixing of molten steel device after evenly mixing
The continuous casting material of ingredient even variation；
5) LP steel plate is rolled on the milling train with dynamic adjustment roll gap function.
2. a kind of production method of LP steel plate according to claim 1, which is characterized in that the sprue gate one, casting
The mouth of a river two is slide gate nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710068859.XA CN108393353B (en) | 2017-02-08 | 2017-02-08 | A kind of production method of LP steel plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710068859.XA CN108393353B (en) | 2017-02-08 | 2017-02-08 | A kind of production method of LP steel plate |
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| CN108393353B true CN108393353B (en) | 2019-08-06 |
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| CN113787177A (en) * | 2021-08-30 | 2021-12-14 | 安徽天沃重工机械有限公司 | Casting method of large-cylinder-diameter marine low-speed diesel engine bearing seat steel casting |
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|---|---|---|---|---|
| JPS5568156A (en) * | 1978-11-14 | 1980-05-22 | Sumitomo Metal Ind Ltd | Production of slab for clad steel plate in continuous casting method |
| DE4108203A1 (en) * | 1991-03-14 | 1991-09-26 | Ge Yu | Prodn. of castings using two or more melts of different compsn. - has melt streams passing separately through prim. cooling chill moulds then into single chill mould |
| CN101780532A (en) * | 2009-12-30 | 2010-07-21 | 中国第一重型机械股份公司 | Continuous casting method of liquid-phase composite slab |
| CN101817023A (en) * | 2009-11-25 | 2010-09-01 | 河北钢铁股份有限公司 | Thickness control method for rolling wedge-shaped steel plate |
| CN103302094A (en) * | 2013-06-08 | 2013-09-18 | 东北大学 | Production method of transverse wedge-shaped rolled thickness-variable steel plate |
| CN104438324A (en) * | 2014-11-08 | 2015-03-25 | 广东省工业技术研究院(广州有色金属研究院) | Short-process roll forming device and method of bimetal composite board |
| CN204565106U (en) * | 2015-03-27 | 2015-08-19 | 辽宁科技大学 | A kind of Y type mouth of a river of uniform temperature |
-
2017
- 2017-02-08 CN CN201710068859.XA patent/CN108393353B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5568156A (en) * | 1978-11-14 | 1980-05-22 | Sumitomo Metal Ind Ltd | Production of slab for clad steel plate in continuous casting method |
| DE4108203A1 (en) * | 1991-03-14 | 1991-09-26 | Ge Yu | Prodn. of castings using two or more melts of different compsn. - has melt streams passing separately through prim. cooling chill moulds then into single chill mould |
| CN101817023A (en) * | 2009-11-25 | 2010-09-01 | 河北钢铁股份有限公司 | Thickness control method for rolling wedge-shaped steel plate |
| CN101780532A (en) * | 2009-12-30 | 2010-07-21 | 中国第一重型机械股份公司 | Continuous casting method of liquid-phase composite slab |
| CN103302094A (en) * | 2013-06-08 | 2013-09-18 | 东北大学 | Production method of transverse wedge-shaped rolled thickness-variable steel plate |
| CN104438324A (en) * | 2014-11-08 | 2015-03-25 | 广东省工业技术研究院(广州有色金属研究院) | Short-process roll forming device and method of bimetal composite board |
| CN204565106U (en) * | 2015-03-27 | 2015-08-19 | 辽宁科技大学 | A kind of Y type mouth of a river of uniform temperature |
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