CN1189256C - Method for continuous casting, continuoccs rolling intermediate and thin sheet blanket - Google Patents

Method for continuous casting, continuoccs rolling intermediate and thin sheet blanket Download PDF

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Publication number
CN1189256C
CN1189256C CN 02132970 CN02132970A CN1189256C CN 1189256 C CN1189256 C CN 1189256C CN 02132970 CN02132970 CN 02132970 CN 02132970 A CN02132970 A CN 02132970A CN 1189256 C CN1189256 C CN 1189256C
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rolling
blank
roll
roller
maximum
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CN 02132970
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CN1483521A (en
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刘玠
孙一康
张恒禄
李龙珍
吴峥
黄维学
王明仁
童朝南
刘文仲
马长仁
高海
王德坤
黄浩东
那杰夫
金福兴
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鞍钢集团新钢铁有限责任公司
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Abstract

The present invention discloses a production method for a continuous casting and rolling coiled plate of an intermediate thin plate blank. A casting blank of a conticaster has low pulling speed and reasonable cross section of a blank, the configuration of a continuous casting furnace and heating furnace is compact, and an output roller way of the casting blank and a furnace inlet roller way of the heating furnace are used in one machine. The furnace inlet temperature of the casting blank reaches more than 900 DEG C, and a tapping method for little heating and cross loading of double furnaces is used. The buffering space between a casting machine and a stepping heating furnace is large. A reversed rough rolling mill with two rollers is rolled for three passes, and a reversed casting machine with four rollers is rolled for one pass, the total rolling time in a rough rolling area reduces 30 seconds, and the temperature of an intermediate blank drops to 50 DEG C. The heat coiling box technology of the intermediate blank is used, the temperature difference between the head and the tail is reduced, and the descaling effect of the intermediate blank is improved. A finishing mill group adopts the measures of bending rollers, crossing rollers, controlling temperature, automatically controlling plate thicknesses, etc. The plate coiling quality is improved, the energy saving performance is realized, the cost is reduced, and the product quality is stabilized. The present invention is suitable for producing continuous casting and rolling coiled plate strip steel of an intermediate plate blank of carbon steel and low-alloy steel, and is especially suitable for producing a thin plate.

Description

The production method of medium thin slab continuous casting and rolling coiled sheet

Technical field

The present invention relates to a kind of production method of medium thin slab continuous casting and rolling coiled sheet.Particularly relate to the production technology of the medium thin slab continuous casting and rolling coiled sheet band steel of carbon steel, low-alloy steel, belong to metallurgical stress metal processing technique field.

Background technology

At present, the continous way hot-strip, it is complete that traditional production technology has kind, the output height, produce flexibly, the advantage that the product compression ratio is big, through pneumatic steelmaking, continuous casting 200mm~250mm heavy slab, the flame cutting, the walking beam furnace heating, de-scaling, the roughing unit is rolling, shear, de-scaling, mm finishing mill unit is rolling, the laminar flow cooling, batch and make the test, its main deficiency is: the casting machine weight of equipment is big, rolling line length, the factory building height, take up an area of big, requiring between continuous casting and the roll line has bigger intermediate slab storehouse to do buffering, equipment investment is big, the energy consumption height, continuous casting billet hot charging rate is the highest only to reach 60%~65%, and average charging temperature has only 500~550 ℃; Slab is long at roughing district rolling time, slab heat loss height, needs higher slab tapping temperature; Be compensation intermediate blank head and tail temperature difference, mm finishing mill unit must adopt increasing speed rolling, will increase finish rolling master capacity motor like this, and production board shape is restive.To this, people improve continuous casting and rolling coiled sheet production technology in research, for example " steel rolling " February in 2000, the 17th the 1st phase of volume disclosed a kind of CSP sheet billet continuous casting and rolling production line, have 96 ten thousand ts of annual output per year, thickness 1.2mm~12.7mm, wide 1000mm~1350mm, the heavy 24.3t of volume, material is the hot-strip of structural carbon steel and low-alloy steel, cast out the slab of thick 50mm~70mm by vertical with bending type continuous casting machine, shearing the back heats in tunnel heating, through de-scaling, 6 finishing mills are rolling, the laminar flow cooling, batch rolling at last, it is little that this production technology has investment, production cost is low, tunnel heating strand charging temperature height, simplify the roughing operation, strengthen the advantage of mm finishing mill unit, can be suitable for the production of thin slab product, but in the production kind, maintenance of equipment and organize the production aspect to have the following disadvantages:

Because the CSP thickness of strand is thin, has only 50mm~70mm, the casting speed height is 3~6m/s, the breakout ratio height in the production, and accident rate is up to 50%; Be subjected to peritectic steel and the big restriction of continuous casting crackle sensitiveness, a lot of steel grades can not be produced; The strand scale is generally at 30m~50m, the roller hearth type heating furnace that the rear portion must the about 200m of configured length, in case the milling train fault, conticaster can only stop production, and the tunnel heating floor space is big, and the equipment complexity, the operation and maintenance difficulty reaches the investment cost height greatly; In process layout, buffering leeway is little between conticaster and the heating furnace, and the accident treatment loss is big when working continuously; This process layout does not have roughing mill, and a kind of slab thickness process mm finishing mill unit shuts out the finished product of different size, to mm finishing mill unit configuration requirement height.

Purpose of the present invention is to overcome existing weak point, and a kind of medium thin slab continuous casting and rolling coiled sheet production method is provided, to improve the quality of products, cut down the consumption of energy, to reduce investment, to reduce cost.

Summary of the invention

The measure scheme that the present invention takes is:

1. the preferred strand pulling rate of conticaster hangs down and the low reasonable blank section of accident rate.

2. take casting machine and heating furnace compact arrangement form, superfast loading improves and goes into the stove blank temperature, the long stroke dress of walking beam furnace configuration steel machine.

3. heating furnace is taked twin furnace hot charging, cold charge. use respectively, have that hot base is directly adorned, cold base is with the flexible measures of transferring with usefulness, employing be the technology that the little intersection of twin furnace takes on steel.

4. take the hot rolling taking technique, reduce the intermediate blank head and tail temperature difference,, improve strip surface quality with water under high pressure associating de-scaling.

5. the roughing district takes rationally distribute rolling pass and rolling load, to improve rolling efficiency and energy-conservation.

6. finishing mill is provided with axially traversing and controlled cooling device of roller, working roll, realizes that the free program of band steel is rolling.

Realize these measures, comprise following processing step successively:

(1) continuous-cast blank

Insulation molten steel jar 100t transported casting machine in 6 minutes, the upright curved continuous bend continuous straightening of R5, and the highest teeming speed 3.5m/min, casting blank cross-section size 100mm~135mm * 900~1550mm, scale 12.9m~15.6m, flame cuts.Adopt the hydraulic oscillating mould technology, improved the quality of strand, guaranteed that casting billet surface does not have the cleaning rate greater than 95%.

Adopt one-level and second computer automation control.

(2) strand heating

Two walking beam heating furnaces are taked the vaporization cooling, is furnished with long stroke dress steel machine, it between casting machine and the heating furnace short stroke compact arrangement, casting machine goes out the charging roller that blank roller way is a heating furnace, the strand furnace temperature height of packing into, and the hot charging rate is more than 95%, average hot charging temperature reaches 900 ℃, 1150~1250 ℃ ± 30 ℃ of slab tapping temperatures, two stoves are respectively 4 sections and 8 sections controls, and continuous casting steel billet is adorned, gone out heating furnace and adopts the little intersection technology of twin furnace.

(3) blank de-scaling

After blank is come out of the stove, carry out de-scaling with the double high pressure water descaling device of pressure 18MPa, 8~15 ° of its jet angle swings, nozzle to the distance between the slab can be adjusted with slab thickness, to satisfy the de-scaling needs.

(4) roughing technology

Big vertical miller carries out side pressure to slab, and the slab maximum subtracts wide amount 30mm, maximum rolling force 3000kN, main motor power 882kW.

1 of two-roller reversible roughing mill adopts filmatic bearing, maximum mill speed 3.5m/s, maximum rolling force 25000kN, main motor power AC5000kW * 2; Band adheres to 1 of the reversible roughing mill of four rollers of vertical miller, maximum mill speed 5.0m/s, maximum rolling force 20000kN, main motor power DC 5515kW, the maximum rolling force 1600kN of adhesion type vertical miller, main motor current 400kW * 2.

Rolling mode: the width and the effectively de-scaling of big vertical miller control band steel, adhere to edger roll in order to improve the strip width precision.Every time reduction ratio of two-roller reversible milling train is all greater than 35%, rolling through three passages, make slab be thinned to full-sized about 30%, rolling together at four roll reversing rollers again, roll into thick 22~38mm blank, reduce 30 seconds by two total rolling times of roughing mill, the blank temperature loss is 30~50 ℃ in the middle of reducing, and the finishing mill inlet temperature is remained between 1000~1100 ℃.

(5) Coil Box technology

Blank by the roughing unit rolling after, before mm finishing mill unit, there is the intermediate blank hot rolling to get facility, wear tape speed 2~2.5m/s, coiling speed<5m/s, uncoiling speed<2m/s batches the thick 20~40mm of blank, wide 900~1550mm, maximum volume-weight 21t, to the insulation of middle blank, head and tail temperature evenly, between roughing and finishing mill buffering, remove iron scale and have good effect.

(6) finish-rolling process

Enter the mm finishing mill unit of forming by 6 stand four-high rolling mills again behind the crop flying shear crop of blank through having garden arc cutting edge, wherein, 1~6 rolling mill support roller is a filmatic bearing, 4 and 5 have the hydraulic AGC device, and 3~6 have set up roller and string roller arrangement, and band steel cooling device is arranged between 1~2,2~3,3~4 frames, maximum rolling force 25000kN, maximum mill speed 10.2m/s, the maximum bending roller force 1200kN of working roll, string roller stroke ± 150mm.It is anti-circular-arc that the flying shear back-end crop becomes, and rolls the fishtail of back afterbody with minimizing, and it is neat to be convenient to batch profile.

(7) band steel laminar flow cooling technology

Cooling facility for laminar flow total length 72m has 20 groups of cooling manifolds, opens and closes by the computer control laminar flow, makes the band steel that the favorable mechanical performance be arranged.By 5 groups of high-pressure water tanks, stablize and respectively organize cooling manifold pressure, stability of flow, laminar cooling water total amount 6400m 3/ h pressure is 0.03MPa~0.05MPa, side water spray pressure 1.0MPa.

(8) strip coiling

Adopt hydraulic pressure 3 to help the winding up roller downcoiler, the maximum 16m/s of coiling speed batches thickness 1.5~13.0mm, reeling width 900~1550mm, coil of strip internal diameter 762mm, external diameter 1150~2100mm, maximum volume-weight 24t.

The present invention has following good effect compared to existing technology:

1. medium thin slab thickness selects to be preferably 100~135mm.Pulling rate reduces, and accident rate is low, and preferred pulling rate is not limited by peritectic steel less than 3.5m/min, wide in variety, finished product compression ratio height, and quality is good.

2. casting machine and the heating furnace compact Layout with long stroke dress steel machine, casting machine go out blank roller way and heating furnace charging roller for dual-purpose on the same group, and the slab charging temperature reaches more than 900 ℃, the saving energy.

3. the different size blank that two heating furnaces are adorned adopts little intersection equilibrium to take on steel technology, makes two heating furnace blank tapping rhythm reasonable, improves the quality of products.

4. conticaster and continuous rolling production line emergent accident buffer time can reach more than 30 minutes, and the storage of can also rolling off the production line of the strand between casting machine and the heating furnace is to be rolled, and is also big to external base accommodation, makes organization of production flexible, reduces stopping production, and improves operating rate.

5. the output height can carry out two-shipper four streams and produce, and realizes producing the above ability of 2,000,000 t per year, and potentiality are big, and sufficient production capacity is arranged.

6. adopt the 3+1 allotment rolling between roughing mill two rolling mills, the mmi machine frame adopts heavy reduction three passages and afer bay a time coupling, two rolling mill rolling load bearing capacity utilization rates reach 88%, reach 30 seconds by the total rolling time minimizing of two rolling mills, reduce 30~50 ℃ of intermediate blank temperature drops, for energy-conservation, improve the quality of products and the rolling condition that provides safeguard of thin kind.

7. advance the preceding intermediate blank of finishing mill and get, intermediate blank is incubated, make head and tail temperature even through the hot rolling of hot coiling box, realize the finishing mill constant speed rolling, guarantee the stability of the operation of rolling, to the requirement of finishing mill main motor current, save equipment investment when the reduction thin material is rolling; Simultaneously, intermediate blank is batched and uncoiling through Coil Box, can make outer volume iron sheet tension, involute iron sheet is squeezed and become flexible, and scale removal effect is ideal very, has solved the problem that middle thin sheet continuous casting pig-iron skin difficulty is removed.

The specific embodiment

The present invention is embodied in sheet continuous casting and rolling production line (ASP) in 1700, adopt the thick medium thin slab R5m of 100~135mm casting machine, two walking beam heating furnaces with long stroke dress steel machine, each one of two rollers and the reversible roughing mill of four rollers, before finishing mill, be provided with intermediate blank hot rolling taking equipment, have 6 of the controlled rolling and controlled cooling finishing mills of bend roller connecting device, laminar flow cooling and 2 downcoilers, it comprises following processing step:

1. continuous-cast blank

The 90t converter steel-smelting molten steel transported casting machine in 6 minutes with 100t insulation jar, R5m teeming speed 3.5m/s strand 100~135mm * 900~1550mm * 12.9mm~15.6m, and casting machine 1 machine 1 stream, this body weight of casting machine 345.8t, factory building height is low, crane runway deck-molding 24.5m.

2. strand heating

Two walking beam heating furnaces are taked the vaporization cooling, being furnished with long stroke dress steel machine, is the short stroke compact arrangement between casting machine and the heating furnace, and casting machine goes out the charging roller that blank roller way is a heating furnace, strand hot charging temperature is more than 900 ℃, 1150 ℃~1250 ℃ ± 30 ℃ of tapping temperatures.To the different size blank that two heating furnaces are adorned, adopt little intersection equilibrium to take on steel technology, make two heating furnace blank tapping rhythm reasonable, improve the quality of products.

3. de-scaling

After strand heating is come out of the stove, carry out de-scaling with the double high pressure water descaling device of pressure 18MPa, blank advance the two-roller reversible roughing mill advance the reversible roughing mill of four rollers roll preceding and advance mm finishing mill unit before also to carry out high-pressure water descaling.

4. roughing technology

The width and the effectively de-scaling of big vertical miller control band steel are adhered to edger roll in order to improve the strip width precision.Each one of two rollers and four roll reversing roller, rolling with maximum rolling force 25000kN and 20000kN respectively.Rolling mode adopts every time reduction ratio of two-roller reversible milling train all greater than 35%, rolling through three passages, make slab be thinned to full-sized about 30%, rolling together at four roll reversing rollers again, roll into thick 22~38mm blank, always rolled time decreased 30 seconds by two roughing mills, the blank temperature loss is 30~50 ℃ in the middle of reducing, and the finishing mill inlet temperature is remained between 1000~1100 ℃.

5. Coil Box technology

After the roughing unit and between the mm finishing mill unit intermediate blank hot coiling box process facility is arranged, can discern blank length automatically, batch automatically, wear tape speed 2m/s~2.5m/s, maximum coiling speed 5m/s, maximum uncoiling speed 2m/s batches the thick 20mm~40mm of blank, wide 900mm~1550mm, maximum volume-weight 21t, to intermediate billet temperature retaining, make head and tail temperature even, remove iron scale.

6. mm finishing mill unit technology

Enter the mm finishing mill unit of forming by 6 stand four-high rolling mills again behind the crop flying shear crop of blank through having garden arc cutting edge, wherein, 1~6 support roller is a filmatic bearing, 4 and 5 have hydraulic pressure automatic control panel thick (AGC) device, 3~6 frames are provided with roller and string roller arrangement, band steel cooling device is arranged between 1~2,2~3,3~4 frames, maximum rolling force 25000kN, maximum mill speed 10.2m/s, the maximum bending roller force 1200kN of working roll, string roller stroke ± 150mm, blank advances 1000~1100 ℃ of mm finishing mill unit, 800~900 ℃ of finishing temperatures.It is anti-circular-arc that the flying shear back-end crop becomes, and rolls the fishtail of back afterbody with minimizing, and it is neat to be convenient to batch profile.

7. be with the steel laminar flow cooling technology

Cooling facility for laminar flow total length 72m has 20 groups of cooling manifolds, opens and closes by the computer control laminar flow, makes the band steel that the favorable mechanical performance be arranged.500 ℃~800 ℃ of control temperature.By 5 groups of online high-pressure water tanks, the stable pressure of respectively organizing cooling manifold, stability of flow, laminar cooling water total amount 6400m 3/ h, pressure are 0.03MPa~0.05MPa, side water spray pressure 1.0MPa.

8. strip coiling

Adopt hydraulic pressure 3 to help the winding up roller downcoiler, batch thickness 1.5~13.0mm, reeling width 900~1550mm, coil of strip internal diameter 762mm, external diameter 1150~2100mm, maximum volume-weight 24t.Main capacity motor DC700kW.Help winding up roller diameter phi 380mm three-roller type.Capacity motor 50kW.

The present invention adopts short stroke compact arrangement between casting machine and the heating furnace according to medium thin slab production characteristics, and casting machine goes out the charging roller that blank roller way is a heating furnace, and the strand charging temperature is greater than 900 ℃; When casting machine and tandem rolling line rhythm of production do not match, strand buffer time can reach 30min, under the situation of heating furnace or roll line fault, the strand store buffer that can roll off the production line, deposit and cushion the slab storehouse that the required slab storehouse of slab is far smaller than conventional output strip line, only the space that need hold the 2000t slab can be satisfied the ordinary production requirement fully, after stove to be heated or roll line recover normally, the slab of the buffering that rolls off the production line still can reach the standard grade continue rolling, simultaneously can also adapt to external slab, on organization of production, have very high flexibility.

Claims (4)

1 one kinds of production methods that relate to metallurgical industry medium thin slab continuous casting and rolling coiled sheet, the present invention is characterised in that and comprises following process steps successively: continuous-cast blank, and------------Coil Box technology---finish-rolling process---is with the steel laminar flow cooling technology to roughing technology in the blank de-scaling in the strand heating
(1) continuous-cast blank
The steel-making molten steel transports radius of curvature 5m conticaster to by insulation molten steel jar, ladle or pans, teeming speed<3.5m/min, cast section 100~150mm * 900~1550mm, the flame cutting, scale 12.9m~15.6m, 1 machine, 1 stream, this body weight of casting machine 345.8t, adopt one-level and second computer automation control
(2) strand heating
Two walking beam heating furnaces, take the vaporization cooling, strand hot charging furnace temperature is more than 900 ℃, casting blank section 100~150mm * 900~1550mm, scale 12.9m~15.6m, hot charging heating efficiency 260t/h, cold charge heating efficiency 180t/h, long stroke dress steel machine range 10500mm, 1150 ℃~1250 ℃ ± 30 ℃ of heating-up temperatures
(3) blank de-scaling
After blank heating is come out of the stove, carry out de-scaling with the double high pressure water descaling device of pressure 18MPa, 8~15 ° of its jet angle swings, nozzle to the distance between the slab can be adjusted with slab thickness,
(4) roughing technology
Big vertical miller carries out side pressure to slab, and slab subtracts wide amount<30mm, maximum rolling force 3000kN, and main motor power 882kW,
Two-roller reversible formula roughing mill, dimension of roller Φ 1270/1170mm * 1700mm, maximum mill speed 3.5m/s, maximum rolling force 25000kN, the back de-scaling is rolled in main motor power AC5000kW * 2,
Four roller reversible roughing mills, working roll size Φ 800/750mm * 1700mm, backing roll size Φ 1400/130mm * 1700mm, maximum mill speed 5.0m/s, maximum rolling force 20000kN, main motor power DC5515kW rolls the back de-scaling,
Four roller reversible roughing mill adhesion type edger rolls, dimension of roller Φ 880/830mm * 450mm, maximum rolling force 1600kN, edger roll power of motor 400kW * 2,
Rolling mode is with the width and the effectively de-scaling of big vertical miller control band steel, adhere to edger roll in order to improve the strip width precision, every time reduction ratio of two-roller reversible milling train is all greater than 35%, and is rolling through three passages, makes slab be thinned to full-sized about 30%, rolling together at four roll reversing rollers again, roll into thick 22~38mm blank, reduce 30 seconds, reduce 30~50 ℃ of blank temperature losses by two total rolling times of roughing mill, the finishing mill inlet temperature is remained between 1000~1100 ℃
(5) Coil Box technology
Blank by the roughing unit rolling after, the Coil Box process facility is arranged before entering mm finishing mill unit, can discern automatically, batch automatically, wear tape speed 2~2.5m/s, coiling speed<5m/s, uncoiling speed<2m/s batches the thick 20~40mm of blank, wide 900~1550mm, maximum volume-weight 21t, batch case technology can meet an urgent need the roll line accident, reduce the blank head and tail temperature difference, remove the belt steel surface iron sheet, improve the mm finishing mill unit rolling stability
(6) finish-rolling process
Blank enters the mm finishing mill unit of being made up of 6 stand four-high rolling mills after the crop flying shear crop of two circular arc cutting edges becomes circular arc type, the 1st~6 rolling mill backing roll adopts filmatic bearing, the the 4th and the 5th rolling mill has the hydraulic AGC function, the 3rd~6 has set up roller and string roller arrangement, band steel cooling device is arranged between 1~2,2~3,3~4 frames
Work roll diameter: 1~2,700~640mm,
3~6,665~615mm
Backing roll diameter: 1550~1400mm,
Maximum rolling force: 25000kN,
Main motor power: DC3500kW * 6
Maximum mill speed 10.2m/s,
Work roll bending: bending roller force<1200kN,
Working roll string roller: stroke ± 150mm,
The AGC hydraulic system: stroke 30mm,
1000~1100 ℃ of finish rolling inlet temperatures,
800~900 ℃ of finish rolling outlet temperatures,
The flying shear back-end crop becomes anti-circular-arc afterbody, produces fishtail behind the minimizing finishing mill, is convenient to neatly batch, and improves roll coil of strip molded appearance,
(7) band steel laminar flow cooling technology
Device total length 72m establishes 20 groups of cooling manifolds, opens and closes by the computer control laminar flow, make the band steel roll the back and obtain the favorable mechanical performance, 500~800 ℃ ± 20 ℃ of strip coiling control temperature are by 5 groups of high-pressure water tanks, the stable cooling manifold pressure flow of respectively organizing is stablized laminar cooling water amount 6400m 3/ h, pressure are 0.03MPa~0.05MPa, side water spray pressure 1.0MPa.
2, the production method of medium thin slab continuous casting and rolling coiled sheet according to claim 1 is characterized in that: medium and thin slab continuous caster and walking beam furnace take close-coupled to arrange, continuous casting go out the charging roller that blank roller way is exactly a heating furnace.
3, the production method of medium thin slab continuous casting and rolling coiled sheet according to claim 1 is characterized in that: adopt the alternately little intersection process of tapping of two heating furnaces.
4, the production method of medium thin slab continuous casting and rolling coiled sheet according to claim 1 is characterized in that: band steel laminar flow cooling technology adopts hydraulic pressure 3 to help the winding up roller downcoiler, batches thickness 1.5~13.0mm,
Reeling width 900~1550mm,
Maximum volume-weight 24t,
Coil of strip internal diameter 762mm,
Coil of strip external diameter 1150~2100mm,
The maximum 16m/s of coiling speed,
Drum diameter Φ 762mm,
Main capacity motor DC700kW,
Help winding up roller diameter of phi 380mm three-roller type,
Capacity motor 50kW,
The pinch roll diameter: top roll Φ 900mm,
Lower roll Φ 400mm,
Motor capacity: top roll 300kW
Lower roll 300kW.
CN 02132970 2002-09-19 2002-09-19 Method for continuous casting, continuoccs rolling intermediate and thin sheet blanket CN1189256C (en)

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Application Number Priority Date Filing Date Title
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CN1189256C true CN1189256C (en) 2005-02-16

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