Title of Invention

A CONTINUOUS CASTING AND ROLLING METHOD FOR MEDIUM PLATE

Abstract A continuous casting and rolling method for medium hot strip is comprised of following steps: continuous casting, during molten steel passing through crystallizers , to form casting blanks having a section thickness of 100-170mm and a width of 900-2000mm by hydraulic oscillating, continuously bending and continuously straightening ; direct rolling, hot feeding and hot charging casting blanks by a two machine with four streams and four streams merging one technique, achieving rapid hot feeding and hot charging or direct rolling for continuous casting blanks ; roughing by a rougher with front and back vertical rolls ; finishing using raising speed rolling by a finishing mill each stand of which are provided with a device for axial shifting an...
Full Text FIELD OF THE INVENTION
The application belongs to metallurgical metal processing field, more specifically relates
to a continuous casting and rolling process for medium plate.
DESCRIPTION OF THE RELATED ART
Now, the producing technique of continuous hot rolling plate is mainly divided into
traditional process and CSP process. The traditional process comprise continuous casting
thick billet with thickness of 200mm~250mm, flame cutting, heating by walking-beam
furnace, descaling, rolling by rough rolling group, shearing, descaling, rolling by finishing
rolling train, stream cooling, coiling. Although this process has advantages of full categories,
high output, flexible production organization and high reduction ratio and so on, this process
still has many disadvantages such as heavy casting device, long rolling line, high workshop,
large space requirement, large device investment, large billet storeroom, high energy
consuming and so on. The CSP process comprises continuous casting thin billet with
thickness of 50mm~70mm, flame cutting, heating by tunnel furnace, descaling, rolling by
finishing rolling train, stream cooling, coiling. Although this process has advantages of
lowering investment and production cost, omitting rough rolling train, strengthening finishing
rolling train, strengthening reduction capability and so on, this process has many
disadvantages such as high casting speed, high breakout ratio, too much restriction to
production kinds, difficult developing new grades, high investment of tunnel furnace,
complicated devices, hard to operate and maintain, rigid production organization, huge cost
of accident treatment, low output and so on. Chinese Patent No. 02132970.2 of the same
applicant disclosed a continuous casting and rolling process for medium/thin plate (ASP
process). The ASP process comprises converter steel-making, continuous casting thick billet
with thickness of 100mm-150mm, flame cutting, heating by walking-beam furnace,
descaling, rough rolling by 3+1 rolling train, hot coil box, shearing, descaling, rolling by
finishing rolling train, stream cooling, coiling. The ASP process has advantages of low cost,
low investment, flexible production organization, simple maintaining, and low accident rate.
But it still has disadvantages, for example, it uses too many old devices, the power of the
motor of finishing rolling train is low, the speed of the roller table is low, the capacity of
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water supply is not enough, the strength of rolling mills' transmission system is not enough,
the configuration of the power supply system is aging and so on. Therefore, the development
of the technology is more or less limited, resulting that output can't reach requirement and the
production development also be limited, and further the width precision, surface quality and
shape control have certain limitation.
SUMMARY OF THE INVENTION
The invention is aimed at eliminating the disadvantages of the above plate production
process. The objects of the invention is to enhancing some crucial technique so as to save
energy, not only improving the heating quality of billet but also improving the uniformity of
plate thickness and quality of plate shape. The invention has advantage of high width
precision, improves the work rate and output of the rolling mill, and makes the continuous
casting and rolling process for medium plate meet the requirement of modern manufacturing.
The production process of the invention substantially employs that of 02132970.2, and
also makes some improvements basing on the former process, so as to improve the
production capacity of the invention, broaden the range of the production categories, and
meanwhile gain new revolution in the fields of shape control, width precision control and
surface quality control. The invention also can realize direct rolling of some steel grades.
To achieve the above objects, the solution of the invention is a continuous casting and
rolling process for medium plate comprising the following steps:
continuous casting, during molten steel passing through mold, to form continuous casting
billet having section thickness of 100mm-170mm and width of 900mm-2000mm by
hydraulic oscillating, continuously bending and continuously straightening;
direct rolling, hot feeding and hot charging by two casters with four streams and
four-streams-merging-one technique, in which each of the two continuous casters' knockout
roller tables respectively connects with entering roller table and exiting roller table of heating
furnace, achieving rapid hot feeding and hot charging or direct rolling for continuous casting
billet; continuous casting billet is fed to entering roller table of heating furnace through
convey roller table, then fed into walking-beam furnace by long-course steel loader of the
heating furnace in order to be heated; the exiting roller table of the continuous caster connects
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with the entering roller table of the heating furnace so that the continuous casting billet is
directly fed into the heating furnace by the roller table for hot charging, the hot charging
temperature averagely is no less than 700□; and one exiting roller table of the continuous
caster connects with the exiting roller table of the heating furnace;
rough rolling by rough rolling mill with front and back vertical rollers, in which the
maximum single-pass side-pressing amount of the vertical rollers is 50mm, the maximum
rolling pressure is 3800kN, and the rolling speed is 0~5.89m/s; when rolling, in each pass,
acting of front vertical rollers and opening of back vertical rollers are automatically
completed by computer, and the automatic control of width is realized through hydraulic
automatic width control (AWC);
finishing rolling using speed-up rolling by finishing rolling train of F1~F7 with a
maximum speed of 22.8m/s, in which vertical rollers are provided before F1; when thickness
of the intermediate billet is 50mm, the maximum pressing amount is 10mm, and the
maximum rolling pressure is 1000kN; F1~F7 finishing rolling train all are provided with a
device for axial shifting and bending working rollers with a maximum axial shifting course of
±200mm and a maximum bending force of 1500kN, so as to improve the control of plate
section's thickness difference and plate shape, and realize free rolling; the maximum speed of
the roller table before the finishing rolling train may be up to 5.89m/s; edge heater is
provided before the finishing rolling train;
stream cooling using three-stage stream cooling technique, in which roughly adjusting
valve set and precisely adjusting valve set as well as online high-level water tank are
provided, so as to stabilize water amount and water pressure of each cooling stage; the side
water-jet pressure is 1Mpa~1.2Mpa so as to assure the plate's lengthwise temperature
uniformity;
coiling with stepping-controlled full hydraulic coiler, in which automatic stepping control
is performed by hydraulic-controlled side guide, pinch roller, wrapper roller's collapsible
reels and high-responsivity wrapper roller to realize precise centering and micro-tension
coiling of plate, reduce towered-shape, avoid the impaction of plate's head on wrapper roller
and eliminate impression of plate's head and wrapper roller on plate.
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In said continuous casting, direct rolling, hot feeding and hot charging, and rough rolling,
the exiting roller tables are covered by insulating covers, such that the temperature drop of
the casting billet and the temperature difference between the intermediate billet's head and
tail are reduced and the temperature of the billet when entering the finishing rolling mill can
be increased by 30~50 and the temperature difference between the billet's head and tail
can be decreased by 30~50.
In said rough rolling, the vertical roller of the front and back vertical rollers provided in
the rough rolling mill is top-attaching driven type, the size of rollers is 1200mm/1100mm
x430mm, and the power of main motor is AC1200kWx2x200/400r/min.
In said finishing rolling, the vertical roller of the vertical rollers provided before Fl is
top-driven attached type, the size of rollers is 750mm/600mmx350mm, and the main
drive motor is 2-AC 370kWx550r/min.
In said finishing rolling, hydraulic low-inertia kinks are provided between the finishing
rolling stands in order to control tension between finishing rolling train and improve plate
quality.
In said stream cooling, the cooling device is provided with 12 sets of online high-level
water tank with a water amount of 1700m3/h and a water pressure of 0.05Mpa~0.08Mpa.
Said mold is a mold for billet continuous casting which has a cavity whose four corners
are in form of right angle or round angle or straight bevel angle, the right angle mold is
traditional billet mold which is composed by two wide sidewalls and two narrow sidewalls
with a right angle being formed between respective wide sidewall and narrow sidewall; the
round angle or straight bevel angle mold for billet continuous casting is composed by two
wide sidewalls and two narrow sidewalls, at both sides of each narrow sidewall, namely the
inner sides connected with the wide sidewalls, respectively have a row of right-triangle
shaped flange, the bevel of which directs to inside, one right-angle surface joins to the inner
surface of the narrow sidewalls, and another right-angle surface is in the same plane with the
side face of the narrow sidewalls, namely the another right-angle surface is an extension of
the side face of the narrow sidewalls.
By carrying out three kinds of timing control, namely billet merging timing control, billet
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passing through logistics bottleneck timing control and billet exiting timing control, and
comparing cushioning ability, heating ability and rolling ability, said
four-streams-merging-one technique optimizes logistics in three walking-beam furnaces with
cushioning zone into which the medium plate in single roller table of two casters with four
streams is directly fed, so as to exert the producing capacity of caster, furnace and rolling line
and realize half-rigid connection of rolling line, furnace and caster.
Said three kinds of timing control are:
Billet converge timing control: which one passes through firstly when two streams from
caster A converge; which one passes through firstly when two streams from caster B
converge; which one passes through firstly when streams from caster A and caster B converge;
wherein such principle is followed that "when the billets converge that the stream which
reaches convergence point firstly passes through firstly and if the two streams reach
simultaneously then the straight stream passes through firstly";
Billet passing through logistics bottleneck timing control: determining the timing of No. 1
billet stream charging #1 larry; determining the timing of No. 4 billet stream charging #3
larry; determining the timing of converging No. 1 and No. 2 billet streams charging #2 larry;
determining the timing when the billet charging #1 furnace exits A1 roller table; determining
the timing of the billet entering the furnace, wherein such principle is followed that "when the
billets converge that the stream which reaches convergence point firstly passes through firstly
and if the two streams reach simultaneously then the straight stream passes through firstly";
Billet exiting timing control: by tandem superimpose-calculating billet's values at each
critical timing as well as checking the cushion capacity and heating capacity of the furnace
and the rolling capacity of the rolling line, finding out billet's values at each critical timing of
each condition, realizing semi-rigid connection of caster, furnace and rolling line, wherein
such principle is followed that "when the billets converge that the stream which reaches
convergence point firstly passes through firstly and if the two streams reach simultaneously
then the straight stream passes through firstly".
Compared with prior arts, the invention has the following advantages:
1. Since new mold is used in the present invention, the corner cooling during molten steel
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solidifying into billet shell in the mold is adjusted from two-dimensional cooling to nearly
one-dimensional cooling, so as to make billet shell solidification relatively uniform to avoid
surface defect caused by nonuniform billet corner's cooling solidification and crack caused
by too low edge temperature while direct rolling.
2. The long-course steel loader used in the present invention not only makes the furnace
having the ability of heating billet but also has the cushion ability for matching continuous
casting and rolling pace. If the rolling mill temporarily halts for a short while, it at most can
store nine cushioning billets, therefore the casting production is not affected.
3. The device for axial shifting and bending working rollers provided in all finishing
rolling trains not only can control thickness difference of plate section (crown and wedge)
and plate flatness, but also can realize free rolling so as to increase rolling yield. The
hydraulic low-inertia kinks used in the production line helps to control tension between
finishing rolling train and improve plate quality. The speed-up rolling technique used in the
finishing rolling trains shortens the feeding time of roller table, reduces temperature drop,
improves thickness uniformity and shape quality and increase mill yield and output.
4. The edge heater helps to improve uniformity of billet temperature, reduce edge crack,
improve edge microstructure, and stabilize operation of the finishing rolling mill.
5. The use of three-stage stream cooling control technique and the provision of roughly
adjusting valve set and precisely adjusting valve set stabilize water amount and water
pressure of each cooling stage and assure the plate's lengthwise temperature uniformity, so as
to assure uniformity of the plate's microstructure and overcome the production defect caused
by water-supply inefficiency in prior arts.
The invention improves the continuous casting and rolling process for medium/thin plate
in terms of layout, devices and production process, so that the production ability,
development of new grades, production quality are improved, with the present invention,
production capacity reaches 5000,000t per year, width precision within 0~10mm reaches
98.5%, the adjustment ability for shape control and crown control reaches advanced world
standard, control ability of surface quality fully reaches the quality standard requirements of
automobile's high grade panel (05), and the proportion of thin plate reaches advanced world
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standard.
DESCRIPTION OF EMBODIMENT
The invention applies to a continuous casting and rolling process for 2150 medium plate.
Molten steel passes through three 250t top-bottom blowing converter, two molten iron
desulphurizing and slag skimming station, two LF ladle furnace and one RH-TB vacuum
processing device, and before being cast, it may be refined by LF ladle furnace or RH-TB
vacuum processing device.
Continuous casting: molten steel passes through mold, to form continuous casting billet
having section thickness of 100mm-170mm, width of 900-2000mm and length of 11 m~ 18m
by hydraulic oscillating, continuously bending and continuously straightening, and then the
billet is subjected to flame cutting. The billet has a maximum single weight of 38t, the
average number of continuously casting furnaces is 30, and the average casting time is 37.3
minute per one furnace. Because of employing the technique of mold hydraulic oscillating,
the quality of casting billet can be improved and also the billet surface defect can be
eliminated.
Direct rolling, hot feeding and hot charging by two casters with four streams and
four-streams-merging-one technique, in which each of the two continuous casters' knockout
roller tables respectively connects with entering roller table and exiting roller table of heating
furnace, achieving rapid hot feeding and hot charging or direct rolling for continuous casting
billet; continuous casting billet is fed to entering roller table of heating furnace through
convey roller table, then fed into walking-beam furnace by long-course steel loader of the
heating furnace in order to be heated. Furthermore, the invention uses direct rolling technique
for some kinds of carbon steel and certain kinds of lower alloy steel. The exiting roller table
of the continuous caster connects with the entering roller table of the heating furnace so that
the continuous casting billet is directly fed into the heating furnace by the roller table for hot
charging. The hot charging temperature averagely is no less than 700. One exiting roller
table of the continuous caster connects with the exiting roller table of the heating furnace.
Upon billet being on connecting roller table, its length is automatically measured and also its
temperature is measured by pyrometer, in order that the billet can be centered according the
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layout and then be heated. A computer is used to optimize the heating control based on the
temperature of the billet entering the furnace. The billets are heated to 1150~1250 in the
furnace, carried out of the furnace by the extractor of the furnace, and placed on the exiting
roller table. This can not only save energy, but also shorten heating time and improve heating
quality of the billet. Some kinds of carbon steel and certain kinds of lower alloy steel, for
example silicon steel, may apply "lower temperature exiting" rolling technique, realizing
rolling of different steel grades.
The long-course steel loader used in the present invention not only makes the furnace
having the ability of heating billet but also has the cushion ability for matching continuous
casting and rolling pace. If the rolling mill temporarily halts for a short while, it at most can
store nine cushioning billets, therefore the casting production is not affected.
By carrying out three kinds of timing control, namely billet merging timing control, billet
passing through logistics bottleneck timing control and billet exiting timing control, and
comparing cushioning ability, heating ability and rolling ability, the
four-streams-merging-one technique optimizes logistics in three walking-beam furnaces with
cushioning zone into which the medium plate in single roller table of two casters with four
streams is directly fed, so as to exert the producing capacity of caster, furnace and rolling line
and realize half-rigid connection of rolling line, furnace and caster.
Said three kinds of timing control are:
Billet converge timing control: which one passes through firstly when two streams from
caster A converge; which one passes through firstly when two streams from caster B
converge; which one passes through firstly when streams from caster A and caster B converge;
wherein such principle is followed that "when the billets converge that the stream which
reaches convergence point firstly passes through firstly and if the two streams reach
simultaneously then the straight stream passes through firstly";
Billet passing through logistics bottleneck timing control: determining the timing of No. 1
billet stream charging #1 larry; determining the timing of No. 4 billet stream charging #3
larry; determining the timing of converging No. 1 and No. 2 billet streams charging #2 larry;
determining the timing when the billet charging #1 furnace exits A1 roller table; determining
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the timing of the billet entering the furnace, wherein such principle is followed that "when the
billets converge that the stream which reaches convergence point firstly passes through firstly
and if the two streams reach simultaneously then the straight stream passes through firstly";
Billet exiting timing control: by tandem superimpose-calculating billet's values at each
critical timing as well as checking the cushion capacity and heating capacity of the furnace
and the rolling capacity of the rolling line, finding out billet's values at each critical timing of
each condition, realizing semi-rigid connection of caster, furnace and rolling line, wherein
such principle is followed that "when the billets converge that the stream which reaches
convergence point firstly passes through firstly and if the two streams reach simultaneously
then the straight stream passes through firstly".
Rough rolling: the heated or direct rolled billet is conveyed by roller tables and passes
through high-pressure water descaling box after the furnace so as to remove scale, and then
enters into four-roller reversible rough rolling mill so as to be rolled. The four-roller
reversible rough rolling mill has attached front and back vertical rollers with a type of
top-attaching driven. The size of rollers is 1200/1100mmx430mmthe maximum
single-pass side-pressing amount is 50mm, the maximum rolling pressure is 3800kN, the
rolling speed is 0~5.89m/s, and the power of main motor is AC1200kWx2x200/400r/min.
when rolling, in each pass, acting of front vertical rollers and opening of back vertical rollers
are automatically completed by computer, and the automatic control of width is realized
through hydraulic automatic width control (AWC) in which the front vertical rollers carry out
odd pass rolling and the back vertical rollers carry out even pass rolling. The maximum
side-pressing amount of each pass is 50mm. After being rolled 3~5 passes in the four-roller
reversible rough rolling mill, the billet is rolled into intermediate billet with a thickness of
30~60mm. During being rolled by the four-roller reversible rough rolling mill, high-pressure
water before and after the four-roller reversible rough rolling mill are used to descale
regenerated scales of the billet. The front and back vertical rollers of the four-roller reversible
rough rolling mill are provided with automatic width control system (AWC), its main purpose
being to correct error of billet width caused by rolling pressure change and correct the width
difference between the billet's head and tail. Width gage and pyrometer are provided after the
four-roller reversible rough rolling mill, so as to monitor width and temperature of billet and
10

provide correction data for setting of finishing rolling mill. The four-roller reversible rough
rolling mill is also provided with dust removal device.
Insulating cover is provided at the exiting roller table in order to reduce temperature drop
of intermediate billet and temperature difference between the billet's head and tail.
Intermediate billet is conveyed to truncate scissor via insulating cover so as to truncate its
head and tail. Detector is provided in front of the truncate scissor in order to detect the shape
of the billet's head, so as to reduce temperature drop of intermediate billet and temperature
difference between the billet's head and tail, and also the temperature at the time of entering
finishing rolling mill can be improved by 30~50 and the temperature difference between
the billet's head and tail can be shorten by 30~50. Therefore, it can realize the optimal
truncation of the scissor, in order to reduce truncation loss and increase yield.
Edge heater is provided in front of the scissor. The heater's parameters are as follows: the
power of the main motor is 2x3000kW, the heating depth is 40mm~60mm, the heating width
is 100mm~150mm, and the temperature rise is 60~100. This helps to improve temperature
uniformity of the billet, reduce edge crack, and improve mischcrystal of edge microstucture.
Also this helps to stabilize operation of the finishing rolling mill, and simultaneously this can
satisfy the requirement of dual phase steel development.
After being truncated head and tail, the billet enters into the high-pressure water descaling
box before finishing rolling mill in order to remove regeneration scale.
Finishing Rolling: billet passes through the small vertical roller device F1E before
finishing rolling mill F1 so as to be rolled. When thickness of the intermediate billet is 50mm,
the maximum pressing amount is 10mm, the maximum rolling pressure is 1000kN, the main
driving motor is 2-AC 370kWx550r/min. Thereafter the billet enters finishing rolling train.
Passing through F1~F7 four-roller finishing rolling train, the billet is rolled into
1.8mm~25.4mm final plate.
F1~F7 finishing rolling train all employ a device for axial shifting and bending working
roller, the maximum shifting course is±200mm, and the bending force is 1500kN. (Only
F3~F6 in ASP have the device for axial shifting and bending working roller, and bending
force only has positive value, no negative value.) This not only can control thickness
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difference of plate section (crown and wedge) and plate flatness, but also can realize free
rolling and increase rolling yield.
The production line uses hydraulic low-inertia kink in order to control tension between
finishing rolling train and improve plate quality.
Stream cooling: it uses three-stage stream cooling technique, in which roughly adjusting
valve set and precisely adjusting valve set as well as 12 sets of online high-level water tank
are provided, so as to stabilize water amount and water pressure of each cooling stage. The
water amount is 1700m3/h, the water pressure is 0.05Mpa~0.08Mpa, and the side water-jet
pressure is 1Mpa~1.2Mpa, so as to assure the plate's lengthwise temperature uniformity.
Coiling: it uses stepping-controlled full hydraulic coiler to coil plate, in which automatic
stepping control is performed by hydraulic-controlled side guide, pinch roller, wrapper
roller's collapsible reels and high-responsivity wrapper roller to realize precise centering and
micro-tension coiling of plate, reduce towered-shape, avoid the impaction of plate's head on
wrapper roller and eliminate impression of plate's head and wrapper roller on plate
The automatic system of the production line is three-grade computer control system, the
first grade being basic automatic system, the second grade being procedure control computer
system and the third grade being production control computer system.
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WE CLAIM:
1. A continuous casting and rolling process for medium plate, characterized in that said
process comprises the following steps:
continuous casting, during molten steel passing through mold, to form continuous casting
billet having section thickness of 100mm-170mm and width of 900mm-2000mm by
hydraulic oscillating, continuously bending and continuously straightening;
direct rolling, hot feeding and hot charging by two casters with four streams and
four-streams-merging-one technique, in which each of the two continuous casters' knockout
roller tables respectively connects with entering roller table and exiting roller table of heating
furnace, achieving rapid hot feeding and hot charging or direct rolling for continuous casting
billet; continuous casting billet is fed to entering roller table of heating furnace through
convey roller table, then fed into walking-beam furnace by long-course steel loader of the
heating furnace in order to be heated; the exiting roller table of the continuous caster connects
with the entering roller table of the heating furnace so that the continuous casting billet is
directly fed into the heating furnace by the roller table for hot charging, the hot charging
temperature averagely is no less than 700 ; and one exiting roller table of the continuous
caster connects with the exiting roller table of the heating furnace;
rough rolling by rough rolling mill with front and back vertical rollers, in which the
maximum single-pass side-pressing amount of the vertical rollers is 50mm, the maximum
rolling pressure is 3800kN, and the rolling speed is 0~5.89m/s; when rolling, in each pass,
acting of front vertical rollers and opening of back vertical rollers are automatically
completed by computer, and the automatic control of width is realized through hydraulic
automatic width control (AWC);
finishing rolling using speed-up rolling by finishing rolling train of F1~F7 with a
maximum speed of 22.8m/s, in which vertical rollers are provided before F1; when thickness
of the intermediate billet is 50mm, the maximum pressing amount is 10mm, and the
maximum rolling pressure is 1000kN; F1~F7 finishing rolling train all are provided with a
device for axial shifting and bending working rollers with a maximum axial shifting course of
±200mm and a maximum bending force of 1500kN, so as to improve the control of plate
13

section's thickness difference and plate shape, and realize free rolling; the maximum speed of
the roller table before the finishing rolling train may be up to 5.89m/s; edge heater is
provided before the finishing rolling train;
stream cooling using three-stage stream cooling technique, in which roughly adjusting
valve set and precisely adjusting valve set as well as online high-level water tank are
provided, so as to stabilize water amount and water pressure of each cooling stage; the side
water-jet pressure is 1Mpa~1.2Mpa so as to assure the plate's lengthwise temperature
uniformity;
coiling with stepping-controlled full hydraulic coiler, in which automatic stepping control
is performed by hydraulic-controlled side guide, pinch roller, wrapper roller's collapsible
reels and high-responsivity wrapper roller to realize precise centering and micro-tension
coiling of plate, reduce towered-shape, avoid the impaction of plate's head on wrapper roller
and eliminate impression of plate's head and wrapper roller on plate.
2. The continuous casting and rolling process for medium plate as claimed in claim 1,
characterized in that in said continuous casting, direct rolling, hot feeding and hot charging,
and rough rolling, the exiting roller tables are covered by insulating covers, such that the
temperature drop of the casting billet and the temperature difference between the intermediate
billet's head and tail are reduced and the temperature of the billet when entering the finishing
rolling mill can be increased by 30~50 and the temperature difference between the billet's
head and tail can be decreased by 30~50.
3. The continuous casting and rolling process for medium plate as claimed in claim 1,
characterized in that in said rough rolling, the vertical roller of the front and back vertical
rollers provided in the rough rolling mill is top-attaching driven type, the size of rollers is
1200mm/1100mmx430mm, and the power of main motor is AC1200kWx2x200/400r/min.
4. The continuous casting and rolling process for medium plate as claimed in claim 1,
characterized in that in said finishing rolling, the vertical roller of the vertical rollers provided
before F1 is top-driven attached type, the size of rollers is 750mm/600mmx350mm, and
the main drive motor is 2-AC 370kWx550r/min.
5. The continuous casting and rolling process for medium plate as claimed in claim 1,
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characterized in that in said finishing rolling, hydraulic low-inertia kinks are provided
between the finishing rolling stands in order to control tension between finishing rolling train
and improve plate quality.
6. The continuous casting and rolling process for medium plate as claimed in claim 1,
characterized in that in said stream cooling, the cooling device is provided with 12 sets of
online high-level water tank with a water amount of 1700m3/h and a water pressure of
0.05Mpa~0.08Mpa.
7. The continuous casting and rolling process for medium plate as claimed in claim 1,
characterized in that the structure of said mold is as follows:
said mold is a mold for billet continuous casting which has a cavity whose four corners are
in form of right angle or round angle or straight bevel angle, the right angle mold is
traditional billet mold which is composed by two wide sidewalls and two narrow sidewalls
with a right angle being formed between respective wide sidewall and narrow sidewall; the
round angle or straight bevel angle mold for billet continuous casting is composed by two
wide sidewalls and two narrow sidewalls, at both sides of each narrow sidewall, namely the
inner sides connected with the wide sidewalls, respectively have a row of right-triangle
shaped flange, the bevel of which directs to inside, one right-angle surface joins to the inner
surface of the narrow sidewalls, and another right-angle surface is in the same plane with the
side face of the narrow sidewalls, namely the another right-angle surface is an extension of
the side face of the narrow sidewalls.
8. The continuous casting and rolling process for medium plate as claimed in claim 1,
characterized in that by carrying out three kinds of timing control, namely billet merging
timing control, billet passing through logistics bottleneck timing control and billet exiting
timing control, and comparing cushioning ability, heating ability and rolling ability, said
four-streams-merging-one technique optimizes logistics in three walking-beam furnaces with
cushioning zone into which the medium plate in single roller table of two casters with four
streams is directly fed, so as to exert the producing capacity of caster, furnace and rolling line
and realize half-rigid connection of rolling line, furnace and caster.
9. The continuous casting and rolling process for medium plate as claimed in claim 8,
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characterized in that said three kinds of timing control are:
billet converge timing control: which one passes through firstly when two streams from
caster A converge; which one passes through firstly when two streams from caster B
converge; which one passes through firstly when streams from caster A and caster B converge;
wherein such principle is followed that "when the billets converge that the stream which
reaches convergence point firstly passes through firstly and if the two streams reach
simultaneously then the straight stream passes through firstly";
billet passing through logistics bottleneck timing control: determining the timing of No. 1
billet stream charging #1 larry; determining the timing of No. 4 billet stream charging #3
larry; determining the timing of converging No. 1 and No. 2 billet streams charging #2 larry;
determining the timing when the billet charging #1 furnace exits A1 roller table; determining
the timing of the billet entering the furnace, wherein such principle is followed that "when the
billets converge that the stream which reaches convergence point firstly passes through firstly
and if the two streams reach simultaneously then the straight stream passes through firstly";
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billet exiting timing control: by tandem superimpose-calculating billet's values at each
critical timing as well as checking the cushion capacity and heating capacity of the furnace
and the rolling capacity of the rolling line, finding out billet's values at each critical timing of
each condition, realizing semi-rigid connection of caster, furnace and rolling line, wherein
such principle is followed that "when the billets converge that the stream which reaches
convergence point firstly passes through firstly and if the two streams reach simultaneously
then the straight stream passes through firstly".

Disclosed herein is a continuous casting and rolling process for medium plate comprising
following steps: continuous casting, during molten steel passing through molds, to form
casting billets having section thickness of 100mm-170mm and width of 900-2000mm by
hydraulic oscillating, continuously bending and continuously straightening; direct rolling, hot
feeding and hot charging by two casters with four streams and four-streams-merging-one
technique, achieving rapid hot feeding and hot charging or direct rolling for continuous
casting billets; roughing by a rough rolling mill with front and back vertical rolls; finishing rolling using speed-up rolling by finishing rolling mill, each stand of the rolling mill is provided with a device for axial shifting and bending device working rollers, wherein the maximum speed is 22.8m/s and the speed of roller table is up to 5.89m/s; stream cooling using three-stage stream cooling control technique; coiling with hydraulic coiler controlled by stepping-controlled technique. The invention provides improvements on layout, device, production process etc., improving production capacity, development of new grades, product quality and production organization.

Documents:

03902-kolnp-2007-abstract.pdf

03902-kolnp-2007-claims.pdf

03902-kolnp-2007-correspondence others 1.1.pdf

03902-kolnp-2007-correspondence others 1.2.pdf

03902-kolnp-2007-correspondence others.pdf

03902-kolnp-2007-description complete.pdf

03902-kolnp-2007-form 1.pdf

03902-kolnp-2007-form 18.pdf

03902-kolnp-2007-form 2.pdf

03902-kolnp-2007-form 3.pdf

03902-kolnp-2007-form 5.pdf

03902-kolnp-2007-international exm report.pdf

03902-kolnp-2007-international publication.pdf

03902-kolnp-2007-international search report.pdf

03902-kolnp-2007-pa.pdf

03902-kolnp-2007-pct priority document notification.pdf

03902-kolnp-2007-pct request form.pdf

03902-kolnp-2007-translated copy of priority document.pdf

3902-KOLNP-2007-ABSTRACT.pdf

3902-kolnp-2007-abstract1.1.pdf

3902-KOLNP-2007-CANCELLED DOCUMENTS.pdf

3902-kolnp-2007-claims 1.1.pdf

3902-KOLNP-2007-CLAIMS.pdf

3902-KOLNP-2007-CORRESPONDENCE 1.3.pdf

3902-KOLNP-2007-CORRESPONDENCE 1.4.pdf

3902-KOLNP-2007-CORRESPONDENCE 1.7.pdf

3902-KOLNP-2007-CORRESPONDENCE-1.5.pdf

3902-KOLNP-2007-CORRESPONDENCE-1.6.pdf

3902-kolnp-2007-correspondence.pdf

3902-kolnp-2007-description (complete).pdf

3902-KOLNP-2007-DESCRIPTION COMPLETE.pdf

3902-kolnp-2007-examination report.pdf

3902-kolnp-2007-form 1.1.pdf

3902-KOLNP-2007-FORM 1.pdf

3902-kolnp-2007-form 18.pdf

3902-kolnp-2007-form 2.1.pdf

3902-KOLNP-2007-FORM 2.pdf

3902-KOLNP-2007-FORM 3.1.1.pdf

3902-kolnp-2007-form 3.pdf

3902-kolnp-2007-form 5.pdf

3902-KOLNP-2007-OTHERS-1.1.pdf

3902-KOLNP-2007-OTHERS.pdf

3902-kolnp-2007-pa.pdf

3902-KOLNP-2007-REPLY TO EXAMINATION REPORT.pdf

3902-kolnp-2007-specification.pdf

3902-kolnp-2007-translated copy of priority document.pdf


Patent Number 240780
Indian Patent Application Number 3902/KOLNP/2007
PG Journal Number 24/2010
Publication Date 11-Jun-2010
Grant Date 01-Jun-2010
Date of Filing 12-Oct-2007
Name of Patentee ANGANG STEEL COMPANY LIMITED
Applicant Address TIEXI DISTRICT, ANSHAN CITY, LIAONING PROVINCE
Inventors:
# Inventor's Name Inventor's Address
1 HUANG, HAODONG NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
2 LIU, JIE NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
3 LI, LONGZHEN NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
4 YANG, XU NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
5 ZHANG, LENG NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
6 MA, YONGGANG NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
7 SHA, XIAOCHUN NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
8 SUN, YIKANG NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
9 WANG, MINGREN NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
10 NA, JIEFU NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
11 ZHANG, HENGLU NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
12 JIN, FUXING NO. 396 SOUTH ZHONGHUA ROAD, ANSHAN, LIAONING PROVINCE 114021
PCT International Classification Number B21B 1/46,B21B 45/08
PCT International Application Number PCT/CN2006/000518
PCT International Filing date 2006-03-27
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 200510046133.3 2005-03-28 China