CN1278790C - Continuous casting and rolling productive technology for figured steel - Google Patents
Continuous casting and rolling productive technology for figured steel Download PDFInfo
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- CN1278790C CN1278790C CN 200310105491 CN200310105491A CN1278790C CN 1278790 C CN1278790 C CN 1278790C CN 200310105491 CN200310105491 CN 200310105491 CN 200310105491 A CN200310105491 A CN 200310105491A CN 1278790 C CN1278790 C CN 1278790C
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Abstract
The present invention discloses a continuous casting and rolling production technology for figured steel, which realizes whole line full-automatic control by adopting the combination of a near-net-shaped continuous casting technology with a super-high pulling rate and a new generation steel material rolling technology. The present invention has high production efficiency, low energy consumption, compact technology and no need of any protection slag and lubricant oil during continuous casting; a crystallizer and a billet shell keep synchronous motion and only a dummy bar head is used to seal the bottom of the crystallizer when a continuous casting machine starts; after being demoulded from the crystallizer, the billet shell cools down in a secondary cooling section and is fed into a roll straightening machine with grip rolls for straightening and direct rolling. The present invention has the advantages of compact technological process, rational logistics and environmental friendliness, can realize the casting and rolling integrated production of the figured steel, particularly realizes the near-net-shaped casting and rolling integrated production of blanks of H-shaped steel; the production technology line investment accounts for one tenth to one fifth of the primary production technology line investment of the near-net-shaped casting and rolling of the blanks of the H-shaped steel.
Description
Technical field
The invention belongs to the production technology of steel, particularly relate to the continuous casting and continuous rolling integration production technology, specifically, relate to the integrated production of near-net-shape casting of section steel profile.
Background technology
In order further to enhance productivity, to reduce cost, the near net shape continuous casting tandem rolling is the main flow of development.And near-net-shape continuous casting of thin strip continuous rolling technology is taken an early lead.For example: (1) CSP production technology: Shi Luoman one compact hot strip steel production of western mark (SMS) (CSP) is to utilize the funnel type crystallizer to solve the molten steel supply problem, conticaster is a vertical bending type, after the production strand is directly sent into the heating of roller bed type heating furnace, dephosphorize by high pressure water, rolling by many finishing mills.(2) ISP production technology: the online torrid zone produces (ISP) technology and is developed by De Make, and strand is slightly thicker than 60mm, has the parallel straight mo(u)ld in two sides, on-line rolling in two steps: the one, depress strand is soft at crystallizer bottom roll; The 2nd, eddy-current heating rolls with three finishing mills after 1100-1500 ℃.(3) CASTRIP production technology: it is reported that U.S. Niu Ke company has developed double roller continuous casting technology (CASTRIP) recently again, directly continuous casting goes out the carbon steel steel band (UCS) of the about 0.7-2.0mm of thickness; In many cases, the UCS product does not need further hot rolling, pickling and cold rolling, and is directly used by the user; CASTRIP is rotated relatively by two rollers, and the meniscus that molten steel is formed at two rollers just begins to solidify.Along with strand moves downward from the molten bath, the base shell is constantly long thick, and nipping a little of roller, the base shell on two sides merges fully and becomes a continuous steel band and come out from the conticaster below, and this conticaster pulling rate is 150m/min (rice/minute) to the maximum.
For shaped steel, be representative with the I-steel, the special-shaped continuous casting billet of nearly end form I-shaped has appearred.The characteristics of the special-shaped base of this nearly end form I-shaped are that average edge of a wing thickness and web thickness are less than 100mm.West mark has gone out the continuous casting billet of thickness 50mm at the continuous casting of the conticaster success of U.S. Chaparral steel mill construction.
From the beginning of the sixties, people just develop " dog bone " shape special-shaped section base (web thickness is greater than 50mm) continuous casting technology, are used to produce big specification H shaped steel.In the present prior art, adopt smelting furnace---continuous casting---cuts---hot delivery and hot charging---technological process of heating furnace---universal mill---finishing mill more.Adopt this technology compression ratio value bigger, recovery rate of iron is low, production efficiency is lower, energy consumption is high, and produce line length, investment is huge.
H shaped steel also claims parallel edge of a wing I-steel or parallel width edge I joist, is the efficient section bar that a kind of distribution of area of section is optimized more, the ratio of strength to weight is bigger.The process characteristic of present H type steel production line is: with square billet, rectangular bloom or shaped blank is raw material, through the blooming mill heavy reduction rolling, forms the middle blank of dog bone shape, through omnipotent roughing and omnipotent finish rolling, forms final H shaped steel product.Adopting the near net shape continuous casting shaped blank is the H shaped steel line of production technology of raw material, and investment economizes most, and flow process is the shortest, is the H shaped steel line of production technology that development potentiality is arranged most.
The subject matter that present this technology exists is how to improve conticaster teeming speed and output, to balance each other with mill capacity.Near net shape continuous casting abnormity H shaped steel line of production technology, though reduced investment is produced 1000000 tons of H type steel production line investments per year for one and still needed 30～5,000,000,000 yuan, investment is still bigger.The deformed steel near net shape continuous casting, because (as the web thickness of H shaped steel less than 30mm) surface area is relatively large, section is complicated, utilize traditional continuous casting technology surface quality to be difficult to reasons such as control, resistance of billet withdrawal are big, cast difficulty and be difficult to realize, and can realize that high pulling rate is a restricted link realizing continuous casting and rolling.
Summary of the invention
The objective of the invention is to provide a kind of continuous casting and rolling process for production of profile iron, it has the production efficiency height, energy consumption is low, and the technology compactness can realize the integrated production of casting of special-shaped steel, particularly can realize the integrated production of casting of nearly end form abnormity H shaped steel.
The object of the present invention is achieved like this: adopt superelevation pulling rate near net shape continuous casting technology to combine with ferrous materials of new generation (deformation induced ferrite transformation) rolling technique, can realize Automatic Control completely.
Its technological process is as follows:
Molten steel supply------the camber formula crystallizer (near net shape continuous casting base) that is synchronized with the movement---two cold-zones------tunnel type steel billet temperature controlling stove---mm finishing mill unit of rolling strong machine that is subjected to the steel district
The present invention can realize the continuous casting of near-net-shape shaped blank by the employing formula crystallizer that is synchronized with the movement, as the I of the web thickness of producing H shaped steel near net shape continuous casting base reaches 16mm (millimeter), and casting rate reaches as high as 120m/min (meter/minute), be enough to and the online coupling of follow-up rolling mm finishing mill unit, realize the integrated production of casting of special-shaped steel.
The formula that the is synchronized with the movement crystallizer that conticaster of the present invention adopts comprises two chains that respectively have half of H shaped blooms type groove, the crystallizer copper wall that is inner arc chain and outer arc chain all has half of nearly end form groove, the crystallizer internal cavity that forms after inner arc chain relative with the outer arc chain group (button) is closed is the H type, also can be arbitrary shapes such as circle, square billet, rectangle.Each self-forming ring-type of two chains drives by transmission mechanism.
Conticaster without dummy bar, only adopts dummy bar head to seal the crystallizer bottom when starting; In order to prevent the secondary oxidation of molten steel in casting process, need adopt steel stream and immerse mouth of a river protection, and immerse mouth of a river seam crossing blowing argon gas protection.The continuous casting billet shell that solidifies is synchronized with the movement after crystallizer bottom breaks away from crystallizer automatically with crystallizer, through secondary cooling zone, is sent into by niproll and to roll strong machine and directly align.For the steel strand that makes band liquid core is pulled out the back rapid solidification from crystallizer, need be in two cold-zones directly to the cooling of steel strand water spray.Utilize the special-purpose machine of rectifying that rolls under the state that strand solidifies fully, to carry out the single-point aligning again.
When the continuous casting billet type designed, the shank of inner arc and outer arc all became constant slope, is about the 2-5 degree for this reason, was preferably 2～3 degree; The shank of inner arc is slightly thicker than the shank of outer arc.Entering subsequent processing rolls when rectifying the machine hole shape, the part that inner arc is thick at first contacts the topping roll that rolls the machine of rectifying, it is out of shape at the inner arc shank, and carry out successively to outer arc from inner arc along the high direction of leg, according to the metal plastic deformation principle, rely on the different metal elongation of shank that interior outer arc is reached unanimity, reach the aligning purpose.
For the trend that makes steel billet is a camber, inboard at the crystallizer inner arc chain of conticaster is provided with the camber directive slide track, the outer arc chain is outwards strained by straining pulley, makes the outer arc chain as far as possible near the inner arc chain, forms H shaped blooms type inner chamber at inside and outside arc chain in conjunction with section.Molten steel cools off in crystallizer in order to make, preliminary coagulation forming, two chains in conjunction with section around be provided with water injector.The crystallization shell of inner arc chain and outer arc chain joint with base shell direct contact surface (crystallization wall) be copper alloy, with the raising heat transfer efficiency.The transmission mechanism of inner arc chain and every chain of outer arc chain is at least two drives.Owing to do not have relative motion between crystallizer wall and the base shell, there is not sliding friction, can realize the compound section high speed casting, casting rate can reach 10-120m/min (meter/minute), and as-cast structure is good, segregation-free, surface quality is good.
Because the strand that comes out from two cold-zones is crooked, must align, the present invention utilizes special use to roll the machine of rectifying and is located at circular-arc type continuous casting machine 90 degree arc places, carries out the single-point aligning under the state that strand solidifies fully.Roll the machine of rectifying and utilize the flow of metal theory, in hole shape, carry out deformation and aligning.
The design of this kind of the present invention can make the casting machine radius be reduced to 2m (rice), can reduce the conticaster factory building height greatly, reduces investment; The machine aligning of rectifying is rolled in utilization simultaneously can improve cc billet surface quality, reduces blemish.The blank that rolls after rectifying can be directly for user's use, also can process of passing through tunnel formula steel billet temperature controlling stove, enter by 1 to 3 mm finishing mill unit that finishing mill is formed, and utilize deformation induced phase transformation to produce the H shaped steel of ferrous materials of new generation.
Near net shape continuous casting of the present invention is the single current continuous casting, casting rate 10-120m/min (rice/minute), casting radius is generally about 3.0m (rice).Molten steel enters the formula crystallizer that is synchronized with the movement by injection device, by the rotation of crystallizer chain, drives strand and advances, the demoulding behind the base shell of formation 15-30mm (millimeter) thickness.Through the pressure cooling of aerosol water spray secondary cooling system, strand enters when rolling the machine of rectifying and solidifies fully.Entering the continuous casting billet that rolls the machine of rectifying answers inboard leg thickness greater than outer legs thickness, or roll and rectify machine top roll angle of sides less than the lower roll angle of sides, in rolling the machine of rectifying, utilize flow of metal to finish to roll strong,, finish the aligning process even inner arc side shank at first contacts roll surface and deforms when strand enters straightener.
Need to carry out adjustment by tunnel type steel billet temperature controlling stove before rolling, evenly the temperature of strand makes the strand temperature reach 800 ℃ ± 50 ℃.Rolling employing parts power continuous rolling a little, utilize deformation induced ferrite transformation and ferrite dynamic recrystallization principle, rolling under 780 ℃～820 ℃ temperature, adopt the low temperature large deformation, to obtain the tiny ferrite crystal grain of 5～10 μ m (micron), production high strength H shaped steel.
Through the steel after the zerolling need by water under high pressure be cooled fast to 600 ℃～below 550 ℃.Adopting quick cooling purpose is for the ferritic structure that prevents deformation induced phase transformation generation recovers, and remains by the ferritic structure of quick cooling with refinement, to obtain the tissues needed performance.
Adopting quick special-shaped flying shear purpose is that H shaped steel product with continuous rolling carries out online segmentation, and the sectional flying shear cutting edge adopts special-shaped cutting edge.
Compact conformation of the present invention, production efficiency height, good product quality.Be characterized in:
(1) do not need to use any covering slag or lubricant in the casting process.
(2) be synchronized with the movement crystallizer and base shell keeps identical movement velocity, need not mold oscillation.
Without dummy bar, only adopt dummy bar head to seal the crystallizer bottom when (3) conticaster starts, the base shell that solidifies through secondary cooling zone, is sent into by niproll and to be rolled the machine of rectifying and directly align after the crystallizer demoulding.
(4) in casting process, adopt the inert gas argon shield, prevent secondary oxidation.
(5) casting is integrated, and overall process is controlled automatically.
(6) technical process is extremely compact, logistics is reasonable, environmentally friendly.
(7) reduced investment is 1/10～1/5 of near net shape continuous casting shaped blank H shaped steel line of production technology investment.
Description of drawings
The concrete technology and the device structure of invention are that embodiment provides by following accompanying drawing.
Fig. 1 is the full continuous casting and rolling production line of a profile iron schematic diagram;
Fig. 2 is the formula structure of mould schematic diagram that is synchronized with the movement;
In Fig. 1, the 1st, molten steel injection device, the 2nd, the formula that is synchronized with the movement crystallizer, the 3rd, secondary cooling system, the 4th, near net shape continuous casting shaped blank deflector roll, the 5th rolls strong machine, the 6th, tunnel type steel billet temperature controlling stove, the 7th, mm finishing mill unit, the 8th, quick special-shaped flying shear, the 9th, gathering-device.
In Fig. 2, the 21st, inner arc chain, the 22nd, outer arc chain, the 23rd, arcuate guide slide rail, the 24th, chain gearing, the 25th, straining pulley.
The specific embodiment
Below in conjunction with accompanying drawing and with the accompanying drawing is that the present invention is described in further detail for embodiment.
The continuous casting and rolling process for production of profile iron of the present invention, be to adopt superelevation pulling rate near net shape continuous casting technology to combine with ferrous materials production technology of new generation, its technological process is: the molten steel supply, and------------tunnel type steel billet temperature controlling stove---finish rolling---is aligned in two cold-zones to continuous casting to be subjected to the steel district.
Said superelevation pulling rate near net shape continuous casting is to carry out in arc is synchronized with the movement the formula crystallizer, the single current continuous casting, and casting rate 10-120m/min, casting radius 2.50-4.50m, best casting radius are 3m.In order to prevent the secondary oxidation in casting process, need adopt argon shield to ladle.When starting, adopt by conticaster dummy bar head to seal the crystallizer bottom.
Directly solidify fully when rolling the machine of rectifying to entering to the cold but strand of strand water spray in two cold-zones, the strand aligning is to adopt the single-point aligning in rolling the machine of rectifying.
The blank that rolls after rectifying can be directly for user's use, also can process of passing through tunnel formula steel billet temperature controlling stove, enter by 1 to 3 mm finishing mill unit that finishing mill is formed.Steel billet need carry out adjustment in tunnel type steel billet temperature controlling stove before rolling, and evenly the temperature of strand makes the strand temperature reach 800 ℃ ± 50 ℃; Rolling employing does not have tension force continuous rolling.Rolling is to adopt no tension force continuous rolling, directly carries out finish rolling, and continuous casting billet does not need segmentation, adopts the endless rolling mode.Rolling temperature should be controlled between 750 ℃～850 ℃, preferably be controlled at 780 ℃～, between 820 ℃.Need directly to spray water through the steel after the zerolling, be cooled fast to 600 ℃～below 550 ℃.
When design continuous casting billet type, the inboard thickness of continuous casting billet is greater than thickness as outside, be crystallizer the half of shaped steel of inner arc chain (or near-net-shape) groove greater than or be slightly larger than the groove of the half of shaped steel of outer arc chain, or roll and rectify machine top roll angle of sides less than the lower roll angle of sides.Specific design is according to the difference of radian difference to some extent dimensionally.As produce H shaped steel, and its inboard leg thickness should be slightly larger than outer legs thickness, and when rectifying operation to roll at next, inboard leg generation extensional is identical with outer legs thickness, reaches the strand aligning.
Employing is at conticaster among the present invention, and the inner arc chain 21 of its crystallization wall is connected to form loop chain by more piece crystallization shell joint, and outer arc chain 22 is connected to form loop chain by more piece crystallization shell joint, and inner arc chain 21 and outer arc chain 22 drive by two drives 24.The crystallization wall of the crystallization wall of crystallization shell joint and crystallization shell joint all is grooves of half of H shaped steel (or near-net-shape), two crystallization walls relative combination can formation H type hole.Be provided with the arcuate guide slide rail 23 that outwards bloats at inner arc chain 21 with inner arc chain 21 1 sides of outer arc chain 22 relative combination sections, on the loop of outer arc chain 22 loop chains, be provided with the straining pulley 25 of outside tension chain 22, make bound fraction, form H type cavity near chain 21.
Be provided with water injector around the section of inner arc chain 21 and the 22 relative combinations of outer arc chain, the pressure mouth water spray of water injector is the outside of directly impacting crystallization shell joint.
Drive 24 is gear, makes the two ends of inner arc chain 21 and outer arc chain 22 do circular motion, and gear the nipping a little to roller contacts of inner arc chain 21 and outer arc chain 22 of nipping is to reduce wearing and tearing.
Claims (10)
1, a kind of continuous casting and rolling process for production of profile iron, technological process is: the molten steel supply, and------------tunnel type steel billet temperature controlling stove---finish rolling---is aligned in two cold-zones to continuous casting to be subjected to the steel district, it is characterized in that said continuous casting is to carry out in arc is synchronized with the movement the formula crystallizer, this crystallizer comprises two chains that respectively have half of steel billet type groove; In casting process, need steel stream is adopted the protection of the immersion mouth of a river, and immersing mouth of a river seam crossing blowing argon gas protection; The cooling strand of directly spraying water in two cold-zones solidifies when rolling the machine of rectifying fully to entering, and the strand aligning is to adopt the single-point aligning in rolling the machine of rectifying; Need in tunnel type steel billet temperature controlling stove, carry out adjustment before rolling, make the strand temperature evenly reach 800 ℃ ± 50 ℃.
2, continuous casting and rolling process for production according to claim 1 is characterized in that continuous casting is the single current continuous casting, casting rate 10-120m/min, casting radius 2.50-4.50m.
3, continuous casting and rolling process for production according to claim 1 and 2 is characterized in that adopting when conticaster starts dummy bar head to seal the crystallizer bottom.
4, continuous casting and rolling process for production according to claim 1, the blank that it is characterized in that rolling after rectifying can be directly for user's use, also can process of passing through tunnel formula steel billet temperature controlling stove, enter by 1 to 3 mm finishing mill unit that finishing mill is formed.
5, according to claim 1 or 4 described continuous casting and rolling process for production, it is characterized in that directly carrying out finish rolling when rolling, continuous casting billet does not need segmentation, adopts the endless rolling mode, and rolling temperature is controlled at 780 ℃～820 ℃.
6, continuous casting and rolling process for production according to claim 5, it is characterized in that through the steel after rolling need be cooled fast to 600 ℃～below 550 ℃.
7, continuous casting and rolling process for production according to claim 1 is characterized in that described technology is applicable to the production of H type, circle, square billet or rectangle steel.
8, the arc that adopts of the continuous casting and rolling process for production according to claim 1 formula crystallizer that is synchronized with the movement, it is characterized in that said crystallizer comprises two chains that respectively have half of steel billet type groove, said chain is respectively inner arc chain (21) and outer arc chain (22), inner arc chain (21) and each self-forming loop of outer arc chain (22), be provided with camber directive slide track (23) in the inboard of inner arc chain (21), on the loop of outer arc chain (22), be provided with the straining pulley (25) of outside tension, be provided with water injector in conjunction with section at inner arc chain (21) and (22) two chains of outer arc chain.
9, the arc according to claim 8 formula crystallizer that is synchronized with the movement is characterized in that crystallizer internal cavity is H type, circle, square billet or rectangle.
10, according to Claim 8 or the 9 described arcs formula crystallizer that is synchronized with the movement, it is characterized in that crystallizer should guarantee the groove of the groove of the half of shaped steel of inner arc chain greater than the half of shaped steel of outer arc chain.
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| CN 200310105491 CN1278790C (en) | 2003-11-07 | 2003-11-07 | Continuous casting and rolling productive technology for figured steel |
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| CN 200310105491 CN1278790C (en) | 2003-11-07 | 2003-11-07 | Continuous casting and rolling productive technology for figured steel |
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| CN1278790C true CN1278790C (en) | 2006-10-11 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101444885B (en) * | 2008-12-29 | 2012-09-26 | 杭州钢铁集团公司 | Continuous casting process for HG20 martensitic steel |
| EP2226139B1 (en) * | 2009-03-07 | 2016-09-28 | SMS Concast AG | Continuous casting method and device for creating preliminary forms, in particular double-t preliminary forms |
| CN101780532B (en) * | 2009-12-30 | 2012-10-24 | 中国第一重型机械股份公司 | Continuous casting method of liquid-phase composite slab |
| CN101885133B (en) * | 2010-07-15 | 2012-05-09 | 武汉钢铁(集团)公司 | Method and equipment for improving steel structure uniformity |
| CN108788039A (en) * | 2017-05-02 | 2018-11-13 | 贵州理工学院 | A kind of method and device preparing tunnel bridge field arc profile iron |
| CN110479763B (en) * | 2019-07-19 | 2021-01-05 | 浙江瑞浦科技有限公司 | Method for directly hot-rolling continuous casting billet into hexagonal stainless steel coil |
| CN112246864B (en) * | 2020-09-17 | 2022-04-26 | 马鞍山钢铁股份有限公司 | Production method of weather-resistant hot-rolled H-shaped steel |
| CN113231610B (en) * | 2021-04-30 | 2022-09-23 | 中冶赛迪工程技术股份有限公司 | Arc vibration thin strip continuous casting method and thin strip continuous casting and rolling production line |
| CN116871323B (en) * | 2023-07-06 | 2024-02-13 | 燕山大学 | Near-net-shape rail steel cast rolling forming equipment and process |
| CN119016517A (en) * | 2024-10-29 | 2024-11-26 | 无锡广兴东茂科技有限公司 | Intelligent control method and system for continuous rolling process of complex cross-section special-shaped steel |
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