CN1864878A - Compact medium-width strip steel production process - Google Patents
Compact medium-width strip steel production process Download PDFInfo
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- CN1864878A CN1864878A CN 200510072821 CN200510072821A CN1864878A CN 1864878 A CN1864878 A CN 1864878A CN 200510072821 CN200510072821 CN 200510072821 CN 200510072821 A CN200510072821 A CN 200510072821A CN 1864878 A CN1864878 A CN 1864878A
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Abstract
The invention relates to a compact method for producing middle-wide strip steel, which comprises: using melt iron to process pretreatment; smelting liquid steel; refining liquid steel; continuously casting the middle-thin plate blank; step beam heater heats uniformly; high-pressure water scale breaker breaks scale; one-frame four-roller reversible roughing mill mills; hot winding box winds; cutting the head and end of middle blank; the high-pressure water scale breaker breaks scale; the finishing roll machine continuously rolls; cooling the interlayer flow; the underground winder winds; and transporting steel coil. Wherein, all processes are inside one workshop or connected workshops. The invention can be used in middle steel factory with 1-2 million ton/year yields to match the metal flow, temperature flow and time flow effectively, to feed the high-temperature non-defect sheet blank at 920Deg. C into step beam heater, to save energy more than 60%, improve 1-2% of metal yield, reduce the producing cost and reduce the transport cost of middle process.
Description
Technical field
The present invention relates to a kind of continuous casting and rolling and produce the method for band steel, particularly a kind of compact technology arrangement is produced the method for medium-width strip, i.e. compact medium-width strip production technology.
Background technology
At present, domestic band steel production status is that wide flat steel tandem mill and ribbon steel tandem mill are in the majority basically, and in partially the compact continuous casting and rolling production line of wide flat steel is still blank.For width is the band steel of 600～1300mm, market demand is not little, and the production of existing ribbon steel production line is not, and the wide flat steel production line also is not suitable for production because technology and economically is unwilling again to produce.
Conventional slab caster is joined the technology that the hot-continuous-rolling strip steel milling train is used to produce the band coil of strip and is had the advantage that the production kind is complete, production scale is big, but because the conticaster radius is big, and have many roughing mills, make that the total system weight of equipment is big, produce line length, plant area is big, and investment is big.Simultaneously between conticaster and roll line, need bigger intermediate slab storehouse and do buffering, increased investment.The average charging temperature of continuous casting billet only is 500～600 ℃, even hot charging, its hot charging rate is about 65% only on average, and energy-saving effect is not obvious.Slab is many in roughing district rolling pass, and the time is long, and the slab thermal loss is big, needs higher tapping temperature, and simultaneously in order to compensate the intermediate blank head and tail temperature difference, mm finishing mill unit must adopt increasing speed rolling, requires capacity motor bigger, and the plate shape of product is difficult to control.
For this reason, the metallargist improves the technological process of production of continuous casting and rolling coiled sheet in research constantly.1989, article one close-coupled output strip line is gone into operation in the Nucor of U.S. company in the world, abbreviate CSP as, its technological process is: straight-through soaking pit → band steel rolling finishing mill group → laminar flow cooling → downcoiler at the bottom of electric furnace → ladle refining furnace → funnel type vertical with bending type continuous casting machine → tunnel type roller, the thickness of the continuous casting billet of producing is 50mm, and the thickness of finished strip is 1.5～12.7mm.1992 at gone into operation the again compact output strip line of a kind of ISP of Italian Cray Meng Na company, and the feature of this technological process is to have adopted the liquid core to depress technology the continuous casting billet of 70mm is pressed onto 43mm, has shortened the length of production line greatly.1997 in the Canadian Algoma company FTSC flow process of having gone into operation, the characteristics of this technology are to have adopted the liquid core of long straight-through funnel type crystallizer and strand to depress technology, the thickness of the continuous casting billet in crystallizer exit is 70mm, enters mm finishing mill unit after process liquid core is pressed down to 50mm.Above-mentioned several typical continuous casting and rolling technique of sheet bar all has the characteristics that flow process is short, technology is compact, saved the roughing operation, has brought small investment, energy consumption is low, recovery rate of iron is high and production cost is low superiority.But since the strand pulling rate height of 50～70mm (4～6m/min), very harsh to the performance requirement of covering slag, very strong to the stability requirement of technology simultaneously, the funnel type crystallizer is restricted for producing peritectic steel and the big steel grade of crack sensitivity.
Disclosed Chinese invention patent application on March 24th, 2004 " production method of medium thin slab continuous casting and rolling coiled sheet " (publication number CN1483521), its disclosed technology is applicable to the production wide flat steel, but have but that production procedure is long, very not compact, 1400m is above at a distance of far reaching, continuous casting billet can not reach whole direct heat and send defectives such as heating furnace to for pneumatic steelmaking and conticaster, this method also not exclusively is applicable to the production of compact medium-width strip, and further improved necessity is arranged.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and defective, further optimize technological process, for the production of medium-width strip provides a kind of production technology of compact medium-width strip,, can produce high-quality medium-width strip economically, efficiently to adapt to medium-scale production capacity.
For reaching above-mentioned purpose, the invention provides a kind of compact medium-width strip production technology, comprise that molten iron preliminary treatment, steel-making, refining, continuous casting, soaking buffering, reversible roughing mill are rolling, Coil Box, tandem rolling, laminar flow cooling, strip coiling and coil of strip transportation operation, it is characterized in that, described whole production technologies be in same factory building and the factory building that is connected to each other in implement following steps successively:
1) desulfurizing iron preliminary treatment
The required molten iron of compact medium-width strip production technology 100% through magnesium grain blowing desulfurization, skim after, with [S]
Molten iron＜0.01% molten iron is blended into converter or electric furnace smelting;
2) steel-making
Will be through the molten iron of pretreatment desulfurizing, the pushing off the slag tapping is carried out in blowing or smelt into the molten steel that temperature and composition all satisfy technological requirement together with the steel scrap furnace charge in electric furnace in oxygen coverter, makes down the quantity of slag＜5kg/t molten steel, steel ladle is implemented online blowing argon gas, purify hot metal during tapping;
3) liquid steel refining
The steel ladle handling is to the liquid steel refining stove, and heating molten steel and alloy fine setting composition make the temperature of molten steel and composition even, with further minimizing field trash, after waiting to reach regulation and requiring, according to process time rhythm demand, with the steel ladle handling to the bale panoramic tables of conticaster;
4) continuous casting
Liquid steel temperature on the bale panoramic tables in the steel ladle is target temperature value ± 10 ℃, current one heat steel water pours back bale panoramic tables Rotate 180 °, molten steel in the steel ladle flows into tundish, realize the continuous pouring of many stoves, pouring into thickness in totally-enclosed mode is 100～160mm, width is 600～1300mm, length is thin plate strand in the zero defect of 9000～15600mm, casting speed is 2.4～3.5m/min, crystallizer is the parallel-plate straight mo(u)ld, its secondary is cooled to the aerosol cooling, by two level computer control, the mean temperature that strand goes out conticaster is 920～960 ℃;
5) walking beam reheating furnace heating soaking
By walking beam reheating furnace the strand that the next temperature of conticaster roller-way direct sending reaches high temperature more than 920 ℃ is compensated heating and samming, after, survey long through accurately locating on the roller-way, surveying is wide, strand is sent on the original position of bringing-up section in the step heating-furnace by charger, carry by step rate then, strand is heated while advancing, when the strand temperature was heated to 1150～1250 ℃, the surface and the core temperature that reach strand were even, and extractor holds up strand and delivers on the outer discharge roller road of stove;
6) strand de-scaling
Strand passes through the high-pressure water descaling case on roller-way before entering roughing mill, iron scale on the removing strand and residual covering slag, De-scaling box water under high pressure ejection pressure P 〉=18Mpa;
7) roughing mill is rolling
The reversible roughing mill of four rollers that strand after the de-scaling enters a band edger roll carries out reversible rolling, edger roll only uses when odd-numbered pass, is furnished with automatic width control and short stroke control, the width and the thickness of control strand also improves the strand head, the shape of tail, it is 20mm that the maximum of edger roll subtracts wide amount, four roll reversing rollers are furnished with electronic depressing and the hydraulic pressure automatic thickness control system, start rolling temperature is 1100～1200 ℃, outlet temperature is 1050～1150 ℃, maximum rolling force is 4000KN, maximum mill speed is 5.5/ second, and strand can be rolled into thickness is 30～45mm, width is 600～1300mm, maximum weight is 21 tons, temperature is 1050～1150 ℃ a intermediate blank;
8) Coil Box is batched
After the runout table output of intermediate blank through roughing mill, entering Coil Box batches, and carry out soaking and insulation, Coil Box can be discerned automatically, promptly batch automatically or automatic driven unwind, Coil Box is that the buffering between roughing operation and the finish rolling operation is connected, and can also reduce the scale on surface of strand head and tail temperature difference and removing intermediate blank, makes the intermediate blank head and tail temperature difference that enters mm finishing mill unit be controlled at 20～30 ℃;
9) intermediate blank cutting head cutting tail
With mechanical shear to the intermediate blank cutting head cutting tail;
10) intermediate blank de-scaling
Intermediate blank after cutting end to end enters the high-pressure water descaling case once more, removes the secondary oxidation iron sheet, De-scaling box water under high pressure ejection pressure 〉=18Mpa;
11) finish rolling operation
Intermediate blank through high-pressure water descaling enters the mm finishing mill unit of being made up of 64 roller mills, mm finishing mill unit is that the intermediate blank of 30～45mm is rolled into the band steel that the thickness that meets technological requirement is 1.2～12.7mm with thickness, the control of employing two level computer, the inlet temperature of finish rolling operation intermediate blank is 930～1000 ℃, and the finish to gauge outlet temperature of band steel is 820～900 ℃;
Band is after steel comes out from the finish rolling operation, through thermometric, survey wide, survey convexity, survey glacing flatness and Thickness Measurement by Microwave after, enter the laminar flow cooling section;
12) band steel laminar flow cooling
The laminar flow cooling is to be set gradually by cooling facility for laminar flow identical more than 10 to form, and is divided into two cooling zones, promptly main cooling zone and fine setting cooling zone;
Each cooling facility for laminar flow comprises U type pipe collector and bottom water spray collector, switching by computer control U type pipe collector and bottom water spray collector, respectively to the upper and lower surface sprinkling cooling of band steel, the band steel is controlled in 540～650 ℃ the coiling temperature scope, so that the band steel of roll forming obtains the favorable mechanical performance;
13) coiling process
The cooled band steel of laminar flow is sent into coiling machine coil into the band coil of strip, coiling machine has the hydraulic pressure control function of marking time, after being with steel by preceding flipper guide centering coiling machine, head enters the pinch roll location, help winding up roller to enter reel through three and be rolled into the band coil of strip, coiling machine batches under permanent tension state, prevents loose winding with accurate location;
14) the band coil of strip is carried
After the band steel rolling, by transportation, lifting means coil of strip is placed on the corresponding stepping transporter and moves on, the band coil of strip on the supply line by bundling, weigh, transport laydown area to or enter warehouse of steel roll behind the spray printing.
Means of transport used in above-mentioned each process or between each step is selected bridge crane.
Ladle refining furnace in the described step 3) liquid steel refining adopts the LF ladle refining furnace, and it is refined molten steel not only, can also cushion being connected between steel-making and the continuous casting.
3～5 block casting base rooms being set as breeze way in the described step 5) walking beam reheating furnace heating soaking pit, is 18～30 minutes to reach buffer time.
When the later step generation temporary derangement of described step 5) walking beam reheating furnace heating soaking, described breeze way is used for by the thin plate strand that long-armed charger is sent the conticaster roller-way here this breeze way of packing into one by one.
Mechanical shear in the described step 9) is selected the rotary drum flying shear for use, and two pairs of circular arc cutting edges of this flying shear configuration to reduce head tongue, afterbody fishtail, are convenient to that finish rolling is nipped and to batch profile neat.
In the described step 12), the number of cooling facility for laminar flow setting is 15～40.
The mm finishing mill unit of described step 11) finish rolling operation is provided with and all-hydraulicly depresses, hydraulic thickness control automatically, work roll bending and working roll roll shifting system, adopt roller heat convex degree learning dynamically control and working roll equipment water jetting cooler, with realize to the band steel convexity control.
In the described step 11) finish rolling operation, further being included in low inertia looper is set between each finishing stand, is the permanent tension-rolling state of 2～7MPa with guarantor unit's tension force.
In the described step 11) finish rolling operation, finishing mill adopts fast roll changing mechanism to change working roll, and the replacing time is no more than 10 minutes.
During described step 14) band coil of strip was carried, transportation, lifting means were travelling car, and this travelling car is progressively lifting in the process of walking, coil of strip were placed on the corresponding stepping transporter move on.
Process of the present invention batches and is with coil of strip to carry warehouse-in unified planning design from desulfurizing iron, steel-making, continuous casting, roughing, finish rolling to finished strip, in the factory building that all is arranged on all operations in the same factory building and is connected to each other, so, each operation compact and reasonable of configuration, logistics is smooth and easy, and the temperature coupling is suitable.System flow has adopted ladle refining furnace, walking beam reheating furnace, Coil Box as the important step that the logistics buffering is connected, the temperature adjustment is mated, and it is smooth and easy reasonable that logistics, temperature flow, time are flowed; Also adopted continuous casting billet directly to send into the walking beam reheating furnace that adjoins and the roughing mill rolling process of heavy reduction by roller-way, shortened the length of technological process greatly, having overcome the interior main streams of prior art flow process is the deficiency that molten steel and strand are caused by automobile or train transport point.
The present invention compared with prior art has following good effect:
(1) with the medium-width strip of explained hereafter of the present invention, its economic benefit and technical merit improve greatly, are that the narrow strip rolling mill and the broad strip mill institute of prior art is irreplaceable;
(2) the present invention for production scale for 160～2,000,000 tons/year medium-sized iron and steel enterprise provide one can the economical production technological process of the production medium-width strip of small investment again;
(3) in the integrated artistic flow process of the present invention, liquid steel refining stove, walking beam reheating furnace, Coil Box have played the buffering linking effect between steel-making and continuous casting, continuous casting and roughing, roughing and the finish rolling, make metal flow, temperature flow, time stream all mate smooth and easy, realized that 100% high temperature zero defect medium thin slab more than 920 ℃ directly enters step heating-furnace, save the energy more than 60%, improve recovery rate of iron 1～2%, reduced production cost;
(4) the present invention only adopts the reversible roughing mill of four rollers of 1 band edger roll, with more than 80 meter of similar technology milling train reduced in comparison roll line, further reduces the rolled piece temperature loss with energy-conservation.Adopted Coil Box technology simultaneously, it is poor to significantly reduce the intermediate blank head and tail temperature, and the intermediate blank head and tail temperature difference that enters mm finishing mill unit can be controlled in 20～30 ℃, for enlarging kind, improving the quality of products, has created very advantageous conditions;
(5) owing to the technology compactness, the operation of 14 steps is arranged in the same factory building or in the factory building that is connected with each other, has significantly reduced floor space, and floor space only is 40～50% of existing similar techniques;
(6) in the whole process flow that begins from desulfurizing iron, metal flow transmits without automobile and train, has shortened transportation range, thereby has significantly reduced the intermediate link freight.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is technology arrangement figure of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described.
As depicted in figs. 1 and 2, the invention provides a kind of embodiment of high compact medium-width strip production technology, prior art has been done outstanding improvement, and its processing step is: desulfurizing iron preliminary treatment 1, pneumatic steelmaking 2, liquid steel refining 3, continuous casting 4, walking beam reheating furnace heating soaking 5, strand de-scaling 6, roughing mill are rolling 7, Coil Box batches 8, intermediate blank cutting head cutting tail 9, intermediate blank de-scaling 10, finish rolling operation 11, band steel laminar cooling system 12, coiling process 13, band coil of strip carry 14.The present invention be arranged on above-described whole production technology arrangements in the same factory building and the factory building that is connected to each other in.
It a production scale 2,000,000 tons/year medium-sized iron and steel enterprise, type medium-width strip production technology compact to design, be used for the medium-width strip that the production width specifications is 600～1300mm, comprise operations such as molten iron preliminary treatment, pneumatic steelmaking, refining, continuous casting, soaking buffering, reversable mill are rolling, Coil Box, tandem rolling, laminar flow cooling, see for details illustrated in figures 1 and 2ly, described whole production technologies are to implement following process step in same main building and in the factory building that is connected to each other successively:
1) the desulfurizing iron preliminary treatment 1
To the required molten iron of compact medium-width strip production technology 100% through magnesium grain blowing desulfurization, skim after, with [S]
Molten iron＜0.01% molten iron is blended into converter smelting;
2) pneumatic steelmaking 2
To blow into the molten steel that temperature and composition all satisfy technological requirement in 80 tons of oxygen coverters through the molten iron of pretreatment desulfurizing, smelting cycle is 32 minutes, carry out the pushing off the slag tapping, make down the quantity of slag＜5kg/t molten steel, steel ladle is implemented online blowing argon gas, purify hot metal during tapping;
3) liquid steel refining 3
The steel ladle handling is to the liquid steel refining stove, and heating molten steel and alloy fine setting composition make the temperature of molten steel and composition even, with further minimizing field trash, after waiting to reach regulation and requiring, according to process time rhythm demand, with the steel ladle handling to the bale panoramic tables of conticaster;
4) continuous casting 4
Liquid steel temperature on the bale panoramic tables in the steel ladle is target temperature value ± 10 ℃, current one heat steel water pours back bale panoramic tables Rotate 180 °, molten steel in the steel ladle flows into tundish, realize the continuous pouring of many stoves, it is 5 meters conticaster that cast enters radius, pouring into thickness in totally-enclosed mode is 100～160mm, width is 600～1300mm, length is thin plate strand in the zero defect of 9000～15600mm, casting speed is 2.4～3.5m/min, crystallizer is the parallel-plate straight mo(u)ld, its secondary is cooled to the aerosol cooling, by two level computer control, the mean temperature that strand goes out conticaster is 920～960 ℃;
5) walking beam reheating furnace heating soaking 5
By the walking beam reheating furnace that has long-armed charger the strand that the next temperature of conticaster roller-way direct sending reaches high temperature more than 920 ℃ is compensated heating and samming, after, survey long through accurately locating on the roller-way, surveying is wide, strand is sent on the original position of bringing-up section in the step heating-furnace by charger, carry by step rate then, strand is heated while advancing, when the strand temperature is heated to 1150～1250 ℃, the surface and the core temperature that reach strand are even, and extractor holds up strand and delivers on the outer discharge roller road of stove;
6) the strand de-scaling 6
Strand passes through the high-pressure water descaling case on roller-way before entering roughing mill, iron scale on the removing strand and residual covering slag, De-scaling box water under high pressure ejection pressure P 〉=18Mpa;
7) roughing mill rolling 7
The reversible roughing mill of four rollers that strand after the de-scaling enters a frame band edger roll carries out 3～5 passage reversible rollings, edger roll only uses when odd-numbered pass, is furnished with automatic width control and short stroke control, the width and the thickness of control strand also improves the strand head, the shape of tail, it is 20mm that the maximum of edger roll subtracts wide amount, four roll reversing rollers are furnished with electronic depressing and the hydraulic pressure automatic thickness control system, start rolling temperature is 1100～1200 ℃, outlet temperature is 1050～1150 ℃, maximum rolling force is 4000KN, maximum mill speed is 5.5/ second, and it is 30～40mm that strand is rolled into thickness, width is 600～1300mm, maximum weight is 21 tons, temperature is 1050～1150 ℃ a intermediate blank;
8) Coil Box batches 8
After the runout table output of intermediate blank through roughing mill, entering Coil Box batches, and carry out soaking and insulation, Coil Box can be discerned automatically, promptly batch automatically or automatic driven unwind, Coil Box is that the buffering between roughing operation and the finish rolling operation is connected, and can also reduce the scale on surface of strand head and tail temperature difference and removing intermediate blank, makes the intermediate blank head and tail temperature difference that enters mm finishing mill unit be controlled at 20～30 ℃;
9) the intermediate blank cutting head cutting tail 9
With mechanical shear to the intermediate blank cutting head cutting tail;
10) the intermediate blank de-scaling 10
Intermediate blank after cutting end to end enters the high-pressure water descaling case once more, removes the secondary oxidation iron sheet, De-scaling box water under high pressure ejection pressure 〉=18Mpa;
11) finish rolling operation 11
Intermediate blank through high-pressure water descaling enters the mm finishing mill unit of being made up of 6 frames, 4 roller mills, mm finishing mill unit is that the intermediate blank of 30～40mm is rolled into the band steel that the thickness that meets technological requirement is 1.2～12.7mm with thickness, the control of employing two level computer, the inlet temperature of finish rolling operation intermediate blank is 930～1000 ℃, and the finish to gauge outlet temperature of band steel is 820～900 ℃;
Band is after steel comes out from the finish rolling operation, through thermometric, survey wide, survey convexity, survey glacing flatness and Thickness Measurement by Microwave after, enter the laminar flow cooling section;
12) cooling of band steel laminar flow 12
The laminar flow cooling is to be set gradually by 24 identical cooling facility for laminar flow to form, and is divided into two cooling zones, promptly main cooling zone and fine setting cooling zone;
Each cooling facility for laminar flow comprises U type pipe collector and bottom water spray collector, switching by computer control U type pipe collector and bottom water spray collector, respectively the upper and lower surface sprinkling of band steel is cooled off with 0.02Mpa hydraulic pressure, the band steel is controlled in 540～650 ℃ the coiling temperature scope, so that the band steel of roll forming obtains the favorable mechanical performance;
13) coiling process 13
The cooled band steel of laminar flow is sent into downcoiler coil into the band coil of strip, coiling machine has the hydraulic pressure control function of marking time, after being with steel by preceding flipper guide centering coiling machine, head enters the pinch roll location, help winding up roller to enter reel through three and be rolled into the band coil of strip, coiling machine batches under permanent tension state, prevents loose winding with accurate location;
14) the band coil of strip carries 14
After the band steel rolling, transfer dolly progressively lifting in the process of walking, move on after accessing the band coil of strip by the stepping transporter of correspondence, the band coil of strip on the supply line by bundling, weigh, transport laydown area to or enter warehouse of steel roll behind the spray printing.
Means of transport used in above-mentioned each process or between each step is selected bridge crane.
Ladle refining furnace in the described step 3) liquid steel refining adopts the LF ladle refining furnace, and it is refined molten steel not only, can also cushion being connected between converter and the continuous casting.
3～5 block casting base rooms being set as breeze way in the described step 5) walking beam reheating furnace heating soaking pit, is 18～30 minutes to reach buffer time.
When the later step generation temporary derangement of described step 5) walking beam reheating furnace heating soaking, the middle thin plate strand of the conticaster roller-way being sent here by long-armed charger is packed on the breeze way in the walking beam reheating furnace one by one.
Mechanical shear in the described step 9) is selected the rotary drum flying shear for use, and two pairs of circular arc cutting edges of this flying shear configuration to reduce head tongue, afterbody fishtail, are convenient to that finish rolling is nipped and to batch profile neat.
The mm finishing mill unit of described step 11) finish rolling operation is provided with and all-hydraulicly depresses, hydraulic thickness control automatically, work roll bending and working roll roll shifting system, adopt roller heat convex degree learning dynamically control and working roll equipment water jetting cooler, with realize to the band steel convexity control.
In the described step 11) finish rolling operation, further being included in low inertia looper is set between each finishing stand, is the permanent tension-rolling state of 2～7MPa with guarantor unit's tension force.
In the described step 11) finish rolling operation, finishing mill adopts fast roll changing mechanism to change working roll, and the replacing time is no more than 10 minutes.
During described step 14) band coil of strip was carried, transportation, lifting means were travelling car, and this travelling car is progressively lifting in the process of walking, coil of strip were placed on the corresponding stepping transporter move on.
The specification of the product of producing by above technological process is:
The width of medium-width strip: 600～1300mm
The thickness of medium-width strip: 1.2～12.7mm
The internal diameter of medium-width strip coil of strip: 762mm
The external diameter of medium-width strip coil of strip: 1850mm
The weight of medium-width strip coil of strip: 21 tons (maximum)
The substance of the wide coil of strip of medium-width strip: 16kg/mm
The steel grade material that can produce is: straight carbon steel, quality carbon steel and low-alloy steel.
Claims (11)
1. compact medium-width strip production technology, comprise that molten iron preliminary treatment, steel-making, refining, continuous casting, soaking buffering, reversible roughing mill are rolling, Coil Box, tandem rolling, laminar flow cooling, strip coiling and coil of strip transportation operation, it is characterized in that, described whole production technologies be in same factory building and the factory building that is connected to each other in implement following steps successively:
1) desulfurizing iron preliminary treatment
The required molten iron of compact medium-width strip production technology 100% through magnesium grain blowing desulfurization, skim after, with [S]
Molten iron＜0.01% molten iron is blended into converter or electric furnace smelting;
2) steel-making
Will be through the molten iron of pretreatment desulfurizing, the pushing off the slag tapping is carried out in blowing or smelt into the molten steel that temperature and composition all satisfy technological requirement together with the steel scrap furnace charge in electric furnace in oxygen coverter, makes down the quantity of slag＜5kg/t molten steel, steel ladle is implemented online blowing argon gas, purify hot metal during tapping;
3) liquid steel refining
The steel ladle handling is to the liquid steel refining stove, and heating molten steel and alloy fine setting composition make the temperature of molten steel and composition even, with further minimizing field trash, after waiting to reach regulation and requiring, according to process time rhythm demand, with the steel ladle handling to the bale panoramic tables of conticaster;
4) continuous casting
Liquid steel temperature on the bale panoramic tables in the steel ladle is target temperature value ± 10 ℃, current one heat steel water pours back bale panoramic tables Rotate 180 °, molten steel in the steel ladle flows into tundish, realize the continuous pouring of many stoves, pouring into thickness in totally-enclosed mode is 100～160mm, width is 600～1300mm, length is thin plate strand in the zero defect of 9000～15600mm, casting speed is 2.4～3.5m/min, crystallizer is the parallel-plate straight mo(u)ld, its secondary is cooled to the aerosol cooling, by two level computer control, the mean temperature that strand goes out conticaster is 920～960 ℃;
5) walking beam reheating furnace heating soaking
By walking beam reheating furnace the strand that the next temperature of conticaster roller-way direct sending reaches high temperature more than 920 ℃ is compensated heating and samming, after, survey long through accurately locating on the roller-way, surveying is wide, strand is sent on the original position of bringing-up section in the step heating-furnace by charger, carry by step rate then, strand is heated while advancing, when the strand temperature was heated to 1150～1250 ℃, the surface and the core temperature that reach strand were even, and extractor holds up strand and delivers on the outer discharge roller road of stove;
6) strand de-scaling
Strand passes through the high-pressure water descaling case on roller-way before entering roughing mill, iron scale on the removing strand and residual covering slag, De-scaling box water under high pressure ejection pressure P 〉=18Mpa;
7) roughing mill is rolling
The reversible roughing mill of four rollers that strand after the de-scaling enters a band edger roll carries out reversible rolling, edger roll only uses when odd-numbered pass, is furnished with automatic width control and short stroke control, the width and the thickness of control strand also improves the strand head, the shape of tail, it is 20mm that the maximum of edger roll subtracts wide amount, four roll reversing rollers are furnished with electronic depressing and the hydraulic pressure automatic thickness control system, start rolling temperature is 1100～1200 ℃, outlet temperature is 1050～1150 ℃, maximum rolling force is 4000KN, maximum mill speed is 5.5/ second, and strand can be rolled into thickness is 30～45mm, width is 600～1300mm, maximum weight is 21 tons, temperature is 1050～1150 ℃ a intermediate blank;
8) Coil Box is batched
After the runout table output of intermediate blank through roughing mill, entering Coil Box batches, and carry out soaking and insulation, Coil Box can be discerned automatically, promptly batch automatically or automatic driven unwind, Coil Box is that the buffering between roughing operation and the finish rolling operation is connected, and can also reduce the scale on surface of strand head and tail temperature difference and removing intermediate blank, makes the intermediate blank head and tail temperature difference that enters mm finishing mill unit be controlled at 20～30 ℃;
9) intermediate blank cutting head cutting tail
With mechanical shear to the intermediate blank cutting head cutting tail;
10) intermediate blank de-scaling
Intermediate blank after cutting end to end enters the high-pressure water descaling case once more, removes the secondary oxidation iron sheet, De-scaling box water under high pressure ejection pressure 〉=18Mpa;
11) finish rolling operation
Intermediate blank through high-pressure water descaling enters the mm finishing mill unit of being made up of 64 roller mills, mm finishing mill unit is that the intermediate blank of 30～45mm is rolled into the band steel that the thickness that meets technological requirement is 1.2～12.7mm with thickness, the control of employing two level computer, the inlet temperature of finish rolling operation intermediate blank is 930～1000 ℃, and the finish to gauge outlet temperature of band steel is 820～900 ℃;
Band is after steel comes out from the finish rolling operation, through thermometric, survey wide, survey convexity, survey glacing flatness and Thickness Measurement by Microwave after, enter the laminar flow cooling section;
12) band steel laminar flow cooling
The laminar flow cooling is to be set gradually by cooling facility for laminar flow identical more than 10 to form, and is divided into two cooling zones, promptly main cooling zone and fine setting cooling zone;
Each cooling facility for laminar flow comprises U type pipe collector and bottom water spray collector, switching by computer control U type pipe collector and bottom water spray collector, respectively to the upper and lower surface sprinkling cooling of band steel, the band steel is controlled in 540～650 ℃ the coiling temperature scope, so that the band steel of roll forming obtains the favorable mechanical performance;
13) coiling process
The cooled band steel of laminar flow is sent into coiling machine coil into the band coil of strip, coiling machine has the hydraulic pressure control function of marking time, after being with steel by preceding flipper guide centering coiling machine, head enters the pinch roll location, help winding up roller to enter reel through three and be rolled into the band coil of strip, coiling machine batches under permanent tension state, prevents loose winding with accurate location;
14) the band coil of strip is carried
After the band steel rolling, by transportation, lifting means coil of strip is placed on the corresponding stepping transporter and moves on, the band coil of strip on the supply line by bundling, weigh, transport laydown area to or enter warehouse of steel roll behind the spray printing.
2. compact medium-width strip production technology according to claim 1 is characterized in that, means of transport used in each process or between each step is selected bridge crane.
3. compact medium-width strip production technology according to claim 1 is characterized in that, ladle refining furnace in the described step 3) liquid steel refining adopts the LF ladle refining furnace, and it is refined molten steel not only, can also cushion being connected between steel-making and the continuous casting.
4. compact medium-width strip production technology according to claim 1 is characterized in that, 3～5 block casting base rooms is set as breeze way in the described step 5) walking beam reheating furnace heating soaking pit, is 18～30 minutes to reach buffer time.
5. compact medium-width strip production technology according to claim 4, it is characterized in that, when the later step generation temporary derangement of described step 5) walking beam reheating furnace heating soaking, described breeze way is used for by the thin plate strand that long-armed charger is sent the conticaster roller-way here this breeze way of packing into one by one.
6. compact medium-width strip production technology according to claim 1, it is characterized in that the mechanical shear in the described step 9) is selected the rotary drum flying shear for use, two pairs of circular arc cutting edges of this flying shear configuration, to reduce head tongue, afterbody fishtail, be convenient to that finish rolling is nipped and to batch profile neat.
7. compact medium-width strip production technology according to claim 1 is characterized in that, in the described step 12), the number of cooling facility for laminar flow setting is 15～40.
8. compact medium-width strip production technology according to claim 1, it is characterized in that, the mm finishing mill unit of described step 11) finish rolling operation is provided with and all-hydraulicly depresses, hydraulic thickness control automatically, work roll bending and working roll roll shifting system, adopt roller heat convex degree learning dynamically control and working roll equipment water jetting cooler, with realize to the band steel convexity control.
9. compact medium-width strip production technology according to claim 1, it is characterized in that, in the described step 11) finish rolling operation, further being included in low inertia looper is set between each finishing stand, is the permanent tension-rolling state of 2～7MPa with guarantor unit's tension force.
10. compact medium-width strip production technology according to claim 1 is characterized in that, in the described step 11) finish rolling operation, finishing mill adopts fast roll changing mechanism to change working roll, and the replacing time is no more than 10 minutes.
11. compact medium-width strip production technology according to claim 1, it is characterized in that during described step 14) band coil of strip was carried, transportation, lifting means were travelling car, this travelling car is progressively lifting in the process of walking, coil of strip is placed on the corresponding stepping transporter move on.
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