EP3606681B1 - Plant and process for multi-mode manufacturing of metal strips and plates - Google Patents
Plant and process for multi-mode manufacturing of metal strips and plates Download PDFInfo
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- EP3606681B1 EP3606681B1 EP18718524.4A EP18718524A EP3606681B1 EP 3606681 B1 EP3606681 B1 EP 3606681B1 EP 18718524 A EP18718524 A EP 18718524A EP 3606681 B1 EP3606681 B1 EP 3606681B1
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- 238000004519 manufacturing process Methods 0.000 title claims description 33
- 238000000034 method Methods 0.000 title description 2
- 230000008569 process Effects 0.000 title description 2
- 239000002184 metal Substances 0.000 title 1
- 238000005096 rolling process Methods 0.000 claims description 66
- 238000001816 cooling Methods 0.000 claims description 42
- 230000009467 reduction Effects 0.000 claims description 30
- 230000006698 induction Effects 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000010923 batch production Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 description 8
- 238000009749 continuous casting Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 208000029154 Narrow face Diseases 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/14—Reduction rate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
Definitions
- the present invention concerns a plant for the continuous or batch production of hot rolled strips and plates, in a wide size range with high plant productivity and cost effectiveness and high product quality.
- EP 1558408 the so-called "cast-rolling" technology is used which unites the continuous casting of a thin slab with liquid core reduction (LCR) to a first roughing rolling step through a high-reduction mill (HRM) or roughing mill that achieves an intermediate product which, after a heating phase in an induction heater and subsequent descaling, is further processed in a second phase of finishing rolling.
- LCR liquid core reduction
- HRM high-reduction mill
- EP 1868748 teaches some improvements from the point of view of plant compactness and energy saving, providing that the continuous casting is directly connected with a rolling step in a single manufacturing step without solution of continuity. In practice there are no longer two separate rolling steps, roughing and finishing, but a single rolling step and the distance between the outlet of the continuous casting and the first stand of the rolling mill will not be greater than 50 m in order to limit the temperature losses of the slab.
- EP 1868748 also provides the production of plates only with "endless" mode and using the same cooling system used for coils, a solution which has proved to be not optimal for the production of plates since the "endless" mode works better for coils and the optimal cooling parameters for plates are significantly different from those for coils.
- the cast slab has a maximum thickness of 50 mm prior to the liquid core reduction that takes it to 40 mm and it undergoes a maximum thickness reduction of 3 mm performed by the pinch rolls located just downstream from the casting machine.
- WO 2007/045988 thus shows a plant suitable for the endless, batch or combined production of strips and plates of hot-rolled steel with thickness from 0,6 mm to 50 mm or half of the maximum thickness of the cast slab, comprising a continuous caster of thin slabs with liquid core reduction, followed by an induction heater, with a first shear therebetween, and then a rolling mill followed by a run out table with a cooling device and then a third shear and a plurality of coilers, wherein said plant further includes a minimum-reduction rolling stand arranged between said continuous caster and said first shear.
- DE 102011004245 shows a plant where a roughing mill is arranged just downstream from the casting machine to perform a slab thickness reduction up to 70%, but in case of problems along the subsequent rolling line said thickness reduction can temporarily be reduced down to zero.
- the aim of the present invention is therefore to provide a solution for the production of continuously hot rolled strips or plates with strip thickness from 0,6 mm to 12 mm and plate thickness from 12 mm to 50 mm or in any case half of whatever may be the slab thickness at the exit of the continuous caster with liquid core reduction, said thickness having a minimum value of 80 mm, with maximum width at least 2100 mm or whatever may be the maximum mould width foreseen, with plate and strip quality the same or better, lower energy consumption, lower impact on the environment, higher productivity and flexibility compared with the afore-mentioned prior art.
- a plant according to the present invention conventionally includes a continuous caster 1 followed at a certain distance by an induction heater 2, with a pendulum shear 3 therebetween, and then a rolling mill 4 followed by a rotary shear 5 and a run out table with a cooling device 6 and a pusher or pusher/piler 7 for plates and finally a high-speed shear 8 before the down coilers 9.
- caster 1 includes a mould followed by a curved liquid core reduction section to produce a slab with a minimum thickness of 80 mm, e.g. 100 mm x 2100 mm, at a casting speed up to 9 m/min. Said slab is then heated by the induction heater 2, comprising four coils in the illustrated example, prior to entering the finishing rolling mill 4, comprising up to seven stands as in the illustrated example, in which the slab undergoes a progressive thickness reduction with decreasing reduction rates, e.g. 58%; 52%; 47%; 43%; 40%; 35%; 30% and work rolls of larger diameter in the initial stands (e.g. the first two in the illustrated example).
- the induction heater 2 comprising four coils in the illustrated example, prior to entering the finishing rolling mill 4, comprising up to seven stands as in the illustrated example, in which the slab undergoes a progressive thickness reduction with decreasing reduction rates, e.g. 58%; 52%; 47%; 43%; 40%; 35%; 30% and work rolls of larger diameter in the initial stands (e
- the finishing rolling mill 4 may also include, at any position after the first two stands, cooling and/or heating devices (e.g. gas or induction heaters) located between the rolling stands so as to be able to better control the rolling conditions by adapting the temperature of the material being rolled to its specific characteristics and needs.
- cooling and/or heating devices e.g. gas or induction heaters
- the resulting strip is then cooled by the cooling device 6 and finally coiled by the down coilers 9 and cut by the high speed shear 8 when the coil has reached the intended weight.
- the slab is then cut into plates by the rotary shear 5 and said plates are moved out of the line by the pusher or pusher/piler 7, possibly after having been cooled in the first section of the cooling device 6.
- a first novel aspect of the present invention resides in the presence of a so-called "kiss pass" stand 10 between the continuous caster 1 and the pendulum shear 3, said stand 10 performing a thickness reduction of only about 10%, and in any case not more than 20%, therefore starting from a minimum reduction of about 8 mm, that has a metallurgical rather than a mechanical purpose.
- this minimum reduction is aimed at the optimisation of the crystalline structure of the slab surface by recrystallizing the coarse grains coming out of the caster in order to obtain smaller grains which are less prone to detach from each other in the actual rolling step carried out in the rolling mill 4.
- the plant also includes, between caster 1 and stand 10, an additional induction heater 11, comprising two coils in the illustrated example, and a descaler 12 so as to: a) avoid the ductility draft temperature ranges, b) keep segregating elements in solution, and c) improve the result of the "kiss pass" reduction (similarly, a further descaler 13 preferably precedes the rolling mill 4).
- the presence in the cast alloy of low-melting elements e.g. copper and tin as in the steel produced from scrap in an EAF
- low-melting elements e.g. copper and tin as in the steel produced from scrap in an EAF
- the recomposition and refining of these grains achieved through this "light" reduction pass provides the double advantage of being able to: a) apply a higher reduction rate in the subsequent first actual reduction step without breaking the material at the surface, and b) obtaining strips/plates of the same high quality even using cheaper and lower-quality scrap, i.e. scrap containing higher concentrations of impurities such as copper and tin.
- the "kiss pass" stand 10 preferably includes working cylinders of smaller diameter with respect to the first stand in the rolling mill 4, since it must apply a minimum reduction while cooling the slab as little as possible, whereby a smaller arc of contact is sufficient and preferable with the advantage that tension stresses at the surface of the rolled stock are minimized.
- Another advantage obtained by arranging the "kiss pass" stand 10 between the continuous caster 1 and the pendulum shear 3, as mentioned above, is the creation of a "mechanical filter” between said two components so as to avoid any disturbance in caster 1 when the slab is cut by shear 3 in case of emergency if there is a cobble in the portion of plant downstream from shear 3.
- a second novel aspect of the present invention resides in the presence of an edger 14, i.e. a narrow face vertical rolling stand, that is preferably positioned immediately upstream from the "kiss pass" stand 10 and preferably preceded by an induction edge heater 15, i.e. a heater with C-shaped coils that heat only the edges of the slab.
- edger 14 could also be arranged immediately upstream from the rolling mill 4 together with its corresponding induction edge heater 15 that could be arranged adjacent to the induction heater 2 on any side thereof.
- edger 14 allows to recrystallize the slab edges, which are the coldest parts and therefore those most sensitive to the formation of cracks, to shape them for minimizing the tension stresses in the subsequent rolling step and to improve the width tolerances. Moreover, edger 14 can reduce the slab width on each side by up to 50 mm whereby a narrower strip/plate can be obtained without any intervention on the mould and thus without reducing the plant productivity.
- a third novel aspect of the present invention resides in the presence, between the "kiss pass" stand 10 and the induction heater 2, of an interconnecting furnace 16 suitable to allow the introduction/removal and the controlled advancement of slabs S.
- an interconnecting furnace 16 suitable to allow the introduction/removal and the controlled advancement of slabs S.
- a typical example is a gas-heated roller hearth furnace or walking beam furnace, usually about 30 m long, but other equivalent types of furnace can obviously be used.
- Said furnace 16 is immediately preceded by an additional pendulum shear 17 so that, as previously mentioned, the present plant not only makes possible to evacuate through a piler 18 re-usable slabs in the case of unavailability of the rolling mill 4, but also to select between the "endless” and “batch/combined” operating modes, as well as to load into the interconnecting furnace 16 (through a loading station 19) slabs at ambient temperature that have been bought on the market.
- the furnace 16 also acts as a buffer to hold and then subsequently load to the rolling line the hot slabs produced and stored in the furnace because of a cobble in the rolling mill 4, once the latter is available again.
- the "kiss pass” stand 10 is located between the continuous caster 1 and the additional pendulum shear 17 therefore it acts as a "mechanical filter", as mentioned above, also between said two components so as to avoid any disturbance in caster 1 when the slab is cut by shear 17 to select the "batch/combined" mode.
- the "kiss pass" stand 10 can be used as a first rolling pass upstream from furnace 16 exactly because it performs a thickness reduction of about 10%, and not more than 20% in any case. Such a reduction is much smaller than the thickness reduction in a roughing mill or in the first stand of a finishing rolling mill according to the prior art, which is in the order of 50-70%, that would result in an unacceptable length of furnace 16.
- the furnace must be sized to hold a slab of a weight corresponding to the weight of a finished coil of strip or a stack of plates to be produced in a batch production cycle, whereby an excessively thinned slab would have an unacceptable length to obtain the required weight.
- a fourth novel aspect of the present invention resides in the fact that the cooling device 6 may include a first cooling section capable of performing an ultra-fast cooling of the plates that corresponds to a quenching thereof. A subsequent tempering at a later working step will provide plates having a higher quality with respect to those produced with prior art plants whose cooling sections are only optimized for strips.
- a plate-specific cooling device 20 may be arranged offline such that the plates removed by the pusher or pusher/piler 7 undergo a multi-stage high-pressure cooling, i.e. each intense cooling stage is followed by an interval in which the temperature of the plate has the time to become substantially homogeneous prior to the successive cooling.
- the cooling device 20 may be followed by a tempering furnace 21, a further controlled cooling 22, a skin pass stand 23 and a roller leveller 24 for a complete treatment of the plates (either cooled in the specific cooling device 20 or in the above-mentioned ultra-fast cooling section of the cooling device 6).
- Another possibility is to provide a cooling device 6 that can be easily adjusted to a plate-specific setting, and in such a case it is obvious that the pusher/piler 7 or an additional pusher/piler 7' would be located between the cooling device 6 and coilers 9. In this way the cooling device 6 can be properly used for the cooling of both high-quality strips and high-quality plates.
- the above-described plant according to the present invention is therefore suitable for producing both high-quality strips and high-quality plates, either in "endless” mode with no solution of continuity of the slab between caster 1 and rolling mill 4 (i.e. the entry speed of the rolling mill 4 is linked to the casting speed through the speed increase in the kiss pass stand), or in "batch/combined” mode with the slab that enters the rolling mill 4 which is disconnected from the slab in caster 1.
- such a plant can use as starting material also slabs coming from the interconnecting furnace 16, either loaded at ambient temperature through the loading station 19 or held at high temperature in furnace 16 itself when used as a buffer.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Continuous Casting (AREA)
Description
- The present invention concerns a plant for the continuous or batch production of hot rolled strips and plates, in a wide size range with high plant productivity and cost effectiveness and high product quality.
- It is known that in the steel industry, considering both rising costs of the raw materials and energy used and also the greater competitiveness required by the global market, as well as the increasingly restrictive regulations in terms of pollution, there is a particularly strong need for a manufacturing method for high-quality hot-rolled steel strips and plates which requires lower investment and production costs and greater production flexibility. Consequently, greater competitiveness can thus be given to the end product processing industry with lower energy consumption, in this way also reducing the negative impact on the environment to a minimum.
- The state of the art is substantially the one described by the same inventor in his prior patents, in particular
EP 1558408 andEP 1868748 which are referred to for further details. InEP 1558408 the so-called "cast-rolling" technology is used which unites the continuous casting of a thin slab with liquid core reduction (LCR) to a first roughing rolling step through a high-reduction mill (HRM) or roughing mill that achieves an intermediate product which, after a heating phase in an induction heater and subsequent descaling, is further processed in a second phase of finishing rolling. - Also foreseen in the afore-mentioned patent
EP 1558408 is the possibility of extracting rough-rolled plates after the first roughing rolling step as an emergency system in case of problems in the portion of the plant downstream of the roughing mill in order to prevent the interruption of the continuous casting process and consequently the production on the line. Given the absence of a controlled cooling system necessary for the production of quality plates, these plates cannot be sold and must necessarily be reduced to scrap to be re-introduced into the production cycle. - Both in
EP 1558408 and in other plants of prior art, between the exit of the roughing mill and the entry to the finishing mill the intermediate product shows a temperature decrease of about 230°C which must be compensated by means of the induction heater so that at the exit of the finishing mill the product still has a temperature of more than about 820-850°C which corresponds to the lower end of the austenitic temperature range. -
EP 1868748 teaches some improvements from the point of view of plant compactness and energy saving, providing that the continuous casting is directly connected with a rolling step in a single manufacturing step without solution of continuity. In practice there are no longer two separate rolling steps, roughing and finishing, but a single rolling step and the distance between the outlet of the continuous casting and the first stand of the rolling mill will not be greater than 50 m in order to limit the temperature losses of the slab.EP 1868748 also provides the production of plates only with "endless" mode and using the same cooling system used for coils, a solution which has proved to be not optimal for the production of plates since the "endless" mode works better for coils and the optimal cooling parameters for plates are significantly different from those for coils. - Other prior art casting and rolling plants are described in
WO 2007/045988 andDE 102011004245 . In the first case, the cast slab has a maximum thickness of 50 mm prior to the liquid core reduction that takes it to 40 mm and it undergoes a maximum thickness reduction of 3 mm performed by the pinch rolls located just downstream from the casting machine.WO 2007/045988 thus shows a plant suitable for the endless, batch or combined production of strips and plates of hot-rolled steel with thickness from 0,6 mm to 50 mm or half of the maximum thickness of the cast slab, comprising a continuous caster of thin slabs with liquid core reduction, followed by an induction heater, with a first shear therebetween, and then a rolling mill followed by a run out table with a cooling device and then a third shear and a plurality of coilers, wherein said plant further includes a minimum-reduction rolling stand arranged between said continuous caster and said first shear.DE 102011004245 shows a plant where a roughing mill is arranged just downstream from the casting machine to perform a slab thickness reduction up to 70%, but in case of problems along the subsequent rolling line said thickness reduction can temporarily be reduced down to zero. - The results obtained so far with the teachings of the above-mentioned patents, though optimal as far as product quality is concerned and in particular for steel strips, have shown that there are still margins of improvement as to technology, plant, productivity and production flexibility. The following areas have been identified as needing improvements:
- 1. Introducing the possibility for production in "batch" mode or "combined" mode with an interruption of the cast slab between the caster and the rolling mill, in other words the slab that enters the rolling mill is separate and with a different speed from the one present in the continuous casting machine. This possibility provides important plant and production flexibility since:
- In the manufacture of coils with a thickness greater than 3 mm, using a "batch" mode instead of an "endless" mode avoids having pieces of strip of significant weight that are outside the tolerances between two contiguous coils which, due to production scheduling requirements, must necessarily have different thicknesses.
- In the manufacture of coils with a thickness greater than 1,5-2,0 mm, in which the mass flow of the caster may be lower than that of the rolling mill, a "batch" mode allows a reduction in energy consumption, in particular in the induction heater, thanks to the higher rolling speed and the consequent reduction in the heat losses.
- In the manufacture of quality plates, where the mass flow of the caster must be lower than that of the rolling mill due to the necessity of maintaining a reduced casting speed required by the type of steel being cast.
- In the manufacture of coils with a significant thickness difference between two contiguous coils which requires a change of setting in the gaps of the rolling stands when there is no material passing therethrough, a "combined" mode allows to produce a first coil mostly in "endless" mode but the last portion thereof is produced in "batch" mode by cutting the slab so that it can be accelerated and rolled faster in order to create the time interval required for the re-setting of the empty rolling mill for the production of the second coil of different thickness.
- 2. Improving the quality of the slab surface prior to the rolling step;
- 3. Introducing a "mechanical filter" between the continuous caster and the pendulum shear used in the plants that adopt the "batch" technology, so as to avoid the problems encountered when the cutting of the slab by the pendulum shear may create perturbations in the casting machine as far back as the meniscus of the mould.
- 4. Increasing plant profitability by producing slabs, in the case of unavailability of the rolling mill due to cobbles that may be subsequently heated and rolled, instead of plates that might be scrapped as in the plants which follow the teachings of the prior art.
- 5. Increasing plant profitability by introducing the possibility of rolling slabs:
- produced at the same works and loaded into the production cycle in the case of unavailability of the melting plants at said works, in particular the slabs mentioned in
point 4 above, and/or - bought on the market at advantageous prices in certain scenarios.
- produced at the same works and loaded into the production cycle in the case of unavailability of the melting plants at said works, in particular the slabs mentioned in
- 6. Increasing the quality of the plates produced, by introducing a dedicated cooling system possibly followed by a dedicated plates treatment line.
- 7. Increasing the production to 4.000.000 ton/year by increasing the casting speed to 9 m/min and consequently the relative mass flow to 8 ton/min.
- 8. Further improving strip width tolerances.
- 9. Reducing the strip width without intervening on the positioning of the narrow faces in the continuous casting mould, which leads to an increase in productivity since it allows the mould width and consequently the mass flow to remain unchanged.
- 10. Further increasing the edge quality of both strips and plates.
- The aim of the present invention is therefore to provide a solution for the production of continuously hot rolled strips or plates with strip thickness from 0,6 mm to 12 mm and plate thickness from 12 mm to 50 mm or in any case half of whatever may be the slab thickness at the exit of the continuous caster with liquid core reduction, said thickness having a minimum value of 80 mm, with maximum width at least 2100 mm or whatever may be the maximum mould width foreseen, with plate and strip quality the same or better, lower energy consumption, lower impact on the environment, higher productivity and flexibility compared with the afore-mentioned prior art.
- This result is obtained with the use of both "endless" production technology without interruption of the cast slab and "batch" or "combined" production technology with interruption of the cast slab between the caster and the rolling mill, in order to achieve production flexibility not to be found with plants built following the teachings of the prior art.
- The advantageous measures adopted in the present invention to improve the plant in question include:
- a) Introducing between the continuous caster and the induction heater a minimum-reduction rolling stand (so-called "kiss pass" stand) which allows to achieve:
- optimisation of the crystalline structure of the slab, by recrystallizing the coarse grains which make up the slab surface at the exit of the continuous caster, in order to obtain smaller grains which tend to detach from each other less easily in the subsequent rolling step,
- creation of a "mechanical filter" between the caster and the subsequent shear cutter, in order to avoid the above-mentioned problems encountered in the prior art plants using "batch" technology.
- b) Introducing a narrow face vertical rolling stand (edger), preferably positioned upstream of the first rolling stand (i.e. the "kiss pass" stand), in order to:
- recrystallize the edges of the slab which are the coldest parts and therefore those most sensitive to the formation of cracks,
- shape the slab edges for minimizing the tension stresses in the subsequent rolling step,
- improve the increasingly strict width tolerances required by end customers,
- reduce the width of the slab by up to 50 mm on each side without reducing the plant productivity.
- c) Introducing between the "kiss pass" stand and the induction heater an interconnecting roller hearth furnace or walking beam furnace that makes possible to:
- evacuate slabs, in the case of unavailability of the rolling mill, that may subsequently be taken up again for production instead of becoming plates that might be scrapped.,
- select between three production operating modes, namely "endless" (optimal for the production of thin strips) or "combined" and "batch" (optimal for the production of thicker strips and for the production of plates),
- start the production cycle from slabs introduced into the furnace at ambient temperature,
- store and load the hot slabs produced and present in the furnace used as a buffer because of a cobble in the rolling mill, once the rolling mill is again available.
- d) Introducing a specific cooling system for the plates downstream of the rolling mill, possibly followed by a dedicated plates treatment line.
- Further advantages and features of the plant according to the present invention will be evident to those skilled in the art from the following detailed and non-limiting description of an embodiment thereof with reference to the only drawing, attached as
Fig.1 , that shows a schematic view of the plant in its most complete embodiment. - With reference to
Fig.1 , there is seen that a plant according to the present invention conventionally includes acontinuous caster 1 followed at a certain distance by an induction heater 2, with a pendulum shear 3 therebetween, and then arolling mill 4 followed by arotary shear 5 and a run out table with acooling device 6 and a pusher or pusher/piler 7 for plates and finally a high-speed shear 8 before thedown coilers 9. - More specifically,
caster 1 includes a mould followed by a curved liquid core reduction section to produce a slab with a minimum thickness of 80 mm, e.g. 100 mm x 2100 mm, at a casting speed up to 9 m/min. Said slab is then heated by the induction heater 2, comprising four coils in the illustrated example, prior to entering the finishing rollingmill 4, comprising up to seven stands as in the illustrated example, in which the slab undergoes a progressive thickness reduction with decreasing reduction rates, e.g. 58%; 52%; 47%; 43%; 40%; 35%; 30% and work rolls of larger diameter in the initial stands (e.g. the first two in the illustrated example). - The
finishing rolling mill 4 may also include, at any position after the first two stands, cooling and/or heating devices (e.g. gas or induction heaters) located between the rolling stands so as to be able to better control the rolling conditions by adapting the temperature of the material being rolled to its specific characteristics and needs. - The resulting strip is then cooled by the
cooling device 6 and finally coiled by the down coilers 9 and cut by thehigh speed shear 8 when the coil has reached the intended weight. Alternatively, if the slab is reduced to plate thickness only it is then cut into plates by therotary shear 5 and said plates are moved out of the line by the pusher or pusher/piler 7, possibly after having been cooled in the first section of thecooling device 6. - A first novel aspect of the present invention resides in the presence of a so-called "kiss pass" stand 10 between the
continuous caster 1 and the pendulum shear 3, saidstand 10 performing a thickness reduction of only about 10%, and in any case not more than 20%, therefore starting from a minimum reduction of about 8 mm, that has a metallurgical rather than a mechanical purpose. In fact, as mentioned above, this minimum reduction is aimed at the optimisation of the crystalline structure of the slab surface by recrystallizing the coarse grains coming out of the caster in order to obtain smaller grains which are less prone to detach from each other in the actual rolling step carried out in the rollingmill 4. The plant also includes, betweencaster 1 and stand 10, anadditional induction heater 11, comprising two coils in the illustrated example, and adescaler 12 so as to: a) avoid the ductility draft temperature ranges, b) keep segregating elements in solution, and c) improve the result of the "kiss pass" reduction (similarly, afurther descaler 13 preferably precedes the rolling mill 4). - Furthermore, the presence in the cast alloy of low-melting elements (e.g. copper and tin as in the steel produced from scrap in an EAF) that tend to gather at the edges of the grains makes said edges even weaker, and the problem obviously increases with the concentration of said low-melting elements. The recomposition and refining of these grains achieved through this "light" reduction pass provides the double advantage of being able to: a) apply a higher reduction rate in the subsequent first actual reduction step without breaking the material at the surface, and b) obtaining strips/plates of the same high quality even using cheaper and lower-quality scrap, i.e. scrap containing higher concentrations of impurities such as copper and tin.
- It should be noted that the "kiss pass" stand 10 preferably includes working cylinders of smaller diameter with respect to the first stand in the rolling
mill 4, since it must apply a minimum reduction while cooling the slab as little as possible, whereby a smaller arc of contact is sufficient and preferable with the advantage that tension stresses at the surface of the rolled stock are minimized. - Another advantage obtained by arranging the "kiss pass" stand 10 between the
continuous caster 1 and the pendulum shear 3, as mentioned above, is the creation of a "mechanical filter" between said two components so as to avoid any disturbance incaster 1 when the slab is cut by shear 3 in case of emergency if there is a cobble in the portion of plant downstream from shear 3. - A second novel aspect of the present invention resides in the presence of an
edger 14, i.e. a narrow face vertical rolling stand, that is preferably positioned immediately upstream from the "kiss pass"stand 10 and preferably preceded by aninduction edge heater 15, i.e. a heater with C-shaped coils that heat only the edges of the slab. However,edger 14 could also be arranged immediately upstream from the rollingmill 4 together with its correspondinginduction edge heater 15 that could be arranged adjacent to the induction heater 2 on any side thereof. - As previously mentioned, the addition of
edger 14 allows to recrystallize the slab edges, which are the coldest parts and therefore those most sensitive to the formation of cracks, to shape them for minimizing the tension stresses in the subsequent rolling step and to improve the width tolerances. Moreover,edger 14 can reduce the slab width on each side by up to 50 mm whereby a narrower strip/plate can be obtained without any intervention on the mould and thus without reducing the plant productivity. - A third novel aspect of the present invention resides in the presence, between the "kiss pass"
stand 10 and the induction heater 2, of an interconnectingfurnace 16 suitable to allow the introduction/removal and the controlled advancement of slabs S. A typical example is a gas-heated roller hearth furnace or walking beam furnace, usually about 30 m long, but other equivalent types of furnace can obviously be used. - Said
furnace 16 is immediately preceded by anadditional pendulum shear 17 so that, as previously mentioned, the present plant not only makes possible to evacuate through apiler 18 re-usable slabs in the case of unavailability of the rollingmill 4, but also to select between the "endless" and "batch/combined" operating modes, as well as to load into the interconnecting furnace 16 (through a loading station 19) slabs at ambient temperature that have been bought on the market. Thefurnace 16 also acts as a buffer to hold and then subsequently load to the rolling line the hot slabs produced and stored in the furnace because of a cobble in the rollingmill 4, once the latter is available again. - Note that the "kiss pass"
stand 10 is located between thecontinuous caster 1 and theadditional pendulum shear 17 therefore it acts as a "mechanical filter", as mentioned above, also between said two components so as to avoid any disturbance incaster 1 when the slab is cut byshear 17 to select the "batch/combined" mode. - Considering that a given percentage of thickness reduction of the slab implies a corresponding percentage of length increase since the slab width remains unchanged, it is noted that the "kiss pass" stand 10 can be used as a first rolling pass upstream from
furnace 16 exactly because it performs a thickness reduction of about 10%, and not more than 20% in any case. Such a reduction is much smaller than the thickness reduction in a roughing mill or in the first stand of a finishing rolling mill according to the prior art, which is in the order of 50-70%, that would result in an unacceptable length offurnace 16. In fact, the furnace must be sized to hold a slab of a weight corresponding to the weight of a finished coil of strip or a stack of plates to be produced in a batch production cycle, whereby an excessively thinned slab would have an unacceptable length to obtain the required weight. - This is also the rationale behind the above-mentioned 20% reduction limit, otherwise it is clear that a greater reduction in the "kiss pass" stand 10 would be helpful in achieving more easily the desired final thickness in the rolling
mill 4, that could possibly have fewer stands. However there is also a "metallurgical limit" that depends on the alloy composition, whereby the "kiss pass" stand 10 can only achieve a maximum thickness reduction that is suitable to obtain the required recrystallization of the grains without causing a breaking of the slab surface. - A fourth novel aspect of the present invention resides in the fact that the
cooling device 6 may include a first cooling section capable of performing an ultra-fast cooling of the plates that corresponds to a quenching thereof. A subsequent tempering at a later working step will provide plates having a higher quality with respect to those produced with prior art plants whose cooling sections are only optimized for strips. - Alternatively, a plate-
specific cooling device 20 may be arranged offline such that the plates removed by the pusher or pusher/piler 7 undergo a multi-stage high-pressure cooling, i.e. each intense cooling stage is followed by an interval in which the temperature of the plate has the time to become substantially homogeneous prior to the successive cooling. In this way it is possible to obtain the desired cooling pattern for each steel grade, and thecooling device 20 may be followed by a temperingfurnace 21, a further controlled cooling 22, askin pass stand 23 and aroller leveller 24 for a complete treatment of the plates (either cooled in thespecific cooling device 20 or in the above-mentioned ultra-fast cooling section of the cooling device 6). - Another possibility is to provide a
cooling device 6 that can be easily adjusted to a plate-specific setting, and in such a case it is obvious that the pusher/piler 7 or an additional pusher/piler 7' would be located between the coolingdevice 6 andcoilers 9. In this way thecooling device 6 can be properly used for the cooling of both high-quality strips and high-quality plates. - The above-described plant according to the present invention is therefore suitable for producing both high-quality strips and high-quality plates, either in "endless" mode with no solution of continuity of the slab between
caster 1 and rolling mill 4 (i.e. the entry speed of the rollingmill 4 is linked to the casting speed through the speed increase in the kiss pass stand), or in "batch/combined" mode with the slab that enters the rollingmill 4 which is disconnected from the slab incaster 1. - Furthermore, such a plant can use as starting material also slabs coming from the interconnecting
furnace 16, either loaded at ambient temperature through theloading station 19 or held at high temperature infurnace 16 itself when used as a buffer.
Claims (12)
- Plant for the endless, batch or combined production of strips and plates of hot-rolled steel with thickness from 0,6 mm to 50 mm or half of the maximum thickness of the cast slab, comprising a continuous caster (1) with liquid core reduction of thin slabs having a minimum thickness of 80 mm at the outlet of said continuous caster (1), followed by an induction heater (2), with a first shear (3) therebetween, and then a rolling mill (4) followed by a second shear (5) and a run out table with a cooling device (6) and a pusher or pusher/piler (7) for plates and then a third shear (8) and a plurality of coilers (9), said plant further including a minimum-reduction rolling stand (10) arranged between said continuous caster (1) and said first shear (3), said minimum-reduction rolling stand (10) being designed to perform a slab thickness reduction of only about 10% and in any case not more than 20%, starting from a thickness reduction of about 8 mm, wherein the plant further includes an additional induction heater (11) and a descaler (12) that are arranged between the continuous caster (1) and the minimum-reduction rolling stand (10).
- Plant according to claim 1, characterized in that it further includes an additional descaler (13) that precedes the rolling mill (4).
- Plant according to claim 1 or 2, characterized in that the minimum-reduction rolling stand (10) includes working cylinders of smaller diameter with respect to the first stand in the rolling mill (4).
- Plant according to any of the preceding claims, characterized in that it further includes an edger (14) designed to reduce the slab width by up to 50 mm on each side, said edger (14) being preferably positioned immediately upstream from the minimum-reduction rolling stand (10) or the rolling mill (4).
- Plant according to the preceding claim, characterized in that it further includes an induction edge heater (15) arranged before the edger (14).
- Plant according to any of the preceding claims, characterized in that it further includes, between the minimum-reduction rolling stand (10) and the induction heater (2), an interconnecting furnace (16) designed to allow the introduction/removal and the controlled advancement of slabs (S), preferably a gas-heated roller hearth furnace or walking beam furnace, said furnace (16) being sized to hold a slab (S) of a weight corresponding to the weight of a finished coil of strip or a stack of plates to be produced in a batch production cycle.
- Plant according to the preceding claim, characterized in that the interconnecting furnace (16) is immediately preceded by a fourth shear (17) and is provided with a piler (18) for the evacuation of slabs (S) from the furnace (16) and a loading station (19) for the loading of slabs (S) into the furnace (16).
- Plant according to any of the preceding claims, characterized in that the cooling device (6) includes a first cooling section capable of performing an ultra-fast cooling of the plates that corresponds to a quenching thereof.
- Plant according to any of the preceding claims, characterized in that it further includes a plate-specific offline cooling device (20) that provides a multi-stage high-pressure cooling of the plates removed by the pusher or pusher/piler (7).
- Plant according to claim 8 or 9, characterized in that it further includes a plates treatment line that receives the plates from the ultra-fast cooling section of the cooling device (6) or from the plate-specific offline cooling device (20), said treatment line comprising in sequence a tempering furnace (21), a controlled cooling (22), a skin pass stand (23) and a roller leveller (24).
- Plant according to any of the preceding claims, characterized in that the cooling device (6) can be adjusted to a plate-specific setting and a pusher/piler (7') is located between the cooling device (6) and the coilers (9).
- Plant according to any of the preceding claims, characterized in that it further includes cooling or heating devices located between the rolling stands of the rolling mill (4), at any position after the first two rolling stands.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19208335.0A EP3632582B1 (en) | 2017-04-10 | 2018-04-09 | Process for multi-mode manufacturing of metal strips and plates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000039423A IT201700039423A1 (en) | 2017-04-10 | 2017-04-10 | PLANT AND PROCEDURE FOR MANUFACTURING IN MULTIPLE STEEL RIBBONS AND SHEET METHODS |
PCT/IB2018/052459 WO2018189652A1 (en) | 2017-04-10 | 2018-04-09 | Plant and process for multi-mode manufacturing of metal strips and plates |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP19208335.0A Division EP3632582B1 (en) | 2017-04-10 | 2018-04-09 | Process for multi-mode manufacturing of metal strips and plates |
EP19208335.0A Division-Into EP3632582B1 (en) | 2017-04-10 | 2018-04-09 | Process for multi-mode manufacturing of metal strips and plates |
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EP3606681A1 EP3606681A1 (en) | 2020-02-12 |
EP3606681B1 true EP3606681B1 (en) | 2021-01-27 |
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EP19208335.0A Active EP3632582B1 (en) | 2017-04-10 | 2018-04-09 | Process for multi-mode manufacturing of metal strips and plates |
EP18718524.4A Active EP3606681B1 (en) | 2017-04-10 | 2018-04-09 | Plant and process for multi-mode manufacturing of metal strips and plates |
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EP19208335.0A Active EP3632582B1 (en) | 2017-04-10 | 2018-04-09 | Process for multi-mode manufacturing of metal strips and plates |
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EP (2) | EP3632582B1 (en) |
JP (2) | JP7095071B2 (en) |
KR (1) | KR102435246B1 (en) |
CN (1) | CN110573269B (en) |
ES (2) | ES2866154T3 (en) |
IT (1) | IT201700039423A1 (en) |
MA (1) | MA47042B1 (en) |
MX (1) | MX2019012216A (en) |
PH (1) | PH12019502312A1 (en) |
RU (1) | RU2752592C2 (en) |
WO (1) | WO2018189652A1 (en) |
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EP4155007A4 (en) * | 2020-05-22 | 2024-02-28 | Toshiba Mitsubishi Electric Industrial Systems Corp | Cutting position control device |
IT202000016120A1 (en) * | 2020-07-03 | 2022-01-03 | Arvedi Steel Eng S P A | PLANT AND PROCEDURE FOR THE CONTINUOUS PRODUCTION OF HOT ROLLED ULTRA-THIN STEEL STRIPS |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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US5276952A (en) * | 1992-05-12 | 1994-01-11 | Tippins Incorporated | Method and apparatus for intermediate thickness slab caster and inline hot strip and plate line |
US5832985A (en) * | 1994-10-20 | 1998-11-10 | Mannesmann Aktiengesellschaft | Process and device for producing a steel strip with the properties of a cold-rolled product |
US6309482B1 (en) * | 1996-01-31 | 2001-10-30 | Jonathan Dorricott | Steckel mill/on-line controlled cooling combination |
NL1007739C2 (en) | 1997-12-08 | 1999-06-09 | Hoogovens Staal Bv | Method and device for manufacturing a high strength steel strip. |
DE69730154T2 (en) | 1996-12-19 | 2005-09-01 | Corus Staal B.V. | METHOD FOR THE PRODUCTION OF STEEL STRIP OR STEEL PLATE |
DE19713604A1 (en) * | 1997-04-02 | 1998-10-08 | Schloemann Siemag Ag | A position-controlled compression frame arranged upstream of a finishing train for continuously cast strip material |
KR100863557B1 (en) * | 2002-07-31 | 2008-10-15 | 주식회사 포스코 | prevention apparatus for distortion of slab in roughing mill |
ITMI20021996A1 (en) * | 2002-09-19 | 2004-03-20 | Giovanni Arvedi | PROCESS AND PRODUCTION LINE FOR THE MANUFACTURE OF ULTRA-THIN HOT TAPE BASED ON THE TECHNOLOGY OF THE THIN SHEET |
US7832460B2 (en) * | 2005-04-07 | 2010-11-16 | Giovanni Arvedi | Process and system for manufacturing metal strips and sheets without discontinuity between continuous casting and rolling |
ITRM20050523A1 (en) * | 2005-10-21 | 2007-04-22 | Danieli Off Mecc | PROCESS AND PLANT FOR THE PRODUCTION OF METAL TAPES. |
DE102008020412A1 (en) * | 2007-08-24 | 2009-02-26 | Sms Demag Ag | Method and device for producing a metal strip by casting rolls |
DE102008003222A1 (en) | 2007-09-13 | 2009-03-19 | Sms Demag Ag | Compact flexible CSP system for continuous, semi-continuous and batch operation |
IT1400002B1 (en) | 2010-05-10 | 2013-05-09 | Danieli Off Mecc | PROCEDURE AND PLANT FOR THE PRODUCTION OF FLAT LAMINATED PRODUCTS |
DE102011004245A1 (en) * | 2010-10-07 | 2012-04-12 | Sms Siemag Ag | Method and device for producing a metal strip by casting rolls |
DE102013019698A1 (en) | 2013-05-03 | 2014-11-06 | Sms Siemag Ag | Method for producing a metallic strip |
CN106244916B (en) * | 2016-09-18 | 2018-05-08 | 武汉钢铁有限公司 | High-quality Thin Specs hot rolled alloy tool steel and its CSP production technologies |
-
2017
- 2017-04-10 IT IT102017000039423A patent/IT201700039423A1/en unknown
-
2018
- 2018-04-09 KR KR1020197033306A patent/KR102435246B1/en active IP Right Grant
- 2018-04-09 EP EP19208335.0A patent/EP3632582B1/en active Active
- 2018-04-09 EP EP18718524.4A patent/EP3606681B1/en active Active
- 2018-04-09 MX MX2019012216A patent/MX2019012216A/en unknown
- 2018-04-09 MA MA47042A patent/MA47042B1/en unknown
- 2018-04-09 CN CN201880024408.9A patent/CN110573269B/en active Active
- 2018-04-09 WO PCT/IB2018/052459 patent/WO2018189652A1/en unknown
- 2018-04-09 ES ES18718524T patent/ES2866154T3/en active Active
- 2018-04-09 RU RU2019135817A patent/RU2752592C2/en active
- 2018-04-09 JP JP2020504467A patent/JP7095071B2/en active Active
- 2018-04-09 ES ES19208335T patent/ES2887184T3/en active Active
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2019
- 2019-10-09 PH PH12019502312A patent/PH12019502312A1/en unknown
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2022
- 2022-05-20 JP JP2022082806A patent/JP2022107666A/en active Pending
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MA47042B1 (en) | 2022-01-31 |
MX2019012216A (en) | 2019-11-21 |
EP3632582A1 (en) | 2020-04-08 |
IT201700039423A1 (en) | 2018-10-10 |
EP3632582B1 (en) | 2021-06-09 |
RU2019135817A (en) | 2021-05-11 |
KR20190134776A (en) | 2019-12-04 |
PH12019502312A1 (en) | 2020-10-12 |
CN110573269A (en) | 2019-12-13 |
WO2018189652A1 (en) | 2018-10-18 |
RU2752592C2 (en) | 2021-07-29 |
ES2887184T3 (en) | 2021-12-22 |
EP3606681A1 (en) | 2020-02-12 |
ES2866154T3 (en) | 2021-10-19 |
JP7095071B2 (en) | 2022-07-04 |
JP2022107666A (en) | 2022-07-22 |
RU2019135817A3 (en) | 2021-06-04 |
JP2020516466A (en) | 2020-06-11 |
KR102435246B1 (en) | 2022-08-22 |
CN110573269B (en) | 2022-01-04 |
MA47042A1 (en) | 2020-12-31 |
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