JP3418739B2 - Continuous casting hot rolling equipment and continuous casting hot rolling method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The claimed invention relates to a continuous casting hot rolling equipment for hot finish rolling or the like without cooling a slab obtained by continuous casting, and a hot rolled sheet or the like using the equipment. The present invention relates to a continuous casting hot rolling method.

[0002]

2. Description of the Related Art A technique called continuous casting hot rolling, in which a slab obtained by continuous casting is hot-rolled at a high temperature without cooling, greatly reduces the energy required to heat the slab before rolling. It has been put into practical use in recent years as it can. Among them, CSP (Comppact Strip Production) is a small slab that is cast by a small (especially low overall height) continuous casting machine, and finish rolling without a rough rolling machine. It is attracting attention as it enables integrated production of continuous casting and hot rolling even for large-scale steel mills.

FIG. 4 is a schematic diagram of the CSP, which is the 5th World Steel Conference (London, March 1 to
2, 1999) "Innovative technologies for strip pr
It was published along with a paper called "Oduction".
In this equipment, following the thin slab continuous casting machine 51,
A cutting machine 52, a tunnel type heating furnace (tunnel furnace) 53, a finish rolling machine 58, a water cooling device (runout table) 59, and a winding machine (coiler) 60 are arranged. The continuous casting machine 51 casts a slab having a thickness of about 50 mm, the cutting machine 52 makes it an appropriate length, and the tunnel furnace 53 heats it to a uniform temperature. The slab is passed through the hot finishing mill 58 as it is to manufacture a hot rolled steel sheet (hot strip). Among the CSP and other continuous casting hot rolling equipments, in addition to the one shown in the figure, there is also known one in which a walking beam type heating furnace is provided, and one in which a rough rolling mill is arranged before a finishing rolling mill. There is.

[0004]

The continuous casting hot rolling equipment (CSP) shown in FIG. 4 has the following problems. That is, a) It is difficult to increase the production capacity because the slab obtained by the continuous casting machine is thin. Even when casting a thin slab, there is a limit to the casting speed (the casting speed cannot be increased in inverse proportion to the thickness), so the slab thickness is 50 mm.
If so, the maximum production capacity per strand is 100 per year.
It is only around 10,000 tons. Even when using a two-strand continuous casting machine, the annual production required by a medium-sized steel mill is 25
It is difficult to secure a production volume of about 0,000 tons.

(B) The rolls of the finish rolling mill are apt to be worn, and the influence thereof may appear on the surface quality of the strip. This is because a considerably large load is applied to the rolls of the finishing mill from a slab of about 50 mm to a steel sheet having a thickness of about 1 to 2 mm only by the finishing mill without using the rough rolling mill.

Among the continuous casting hot rolling equipment (not shown) such as a walking beam type heating furnace, the equipment is combined so as to be preferable in terms of production capacity, product quality and equipment cost. I can't find it. That is, c) For example, when a walking beam type heating furnace is used, a skid mark is formed on the slab due to contact with the water-cooled skid at a certain position, which adversely affects the strip thickness accuracy due to rolling. The walking beam type furnace has a problem that the size of the furnace body is limited in order to perform uniform heating, and therefore the slab length is limited and a large single-weight hot coil cannot be manufactured.

(D) Even when the rough rolling mill is arranged in front of the finish rolling mill, if the rough rolling mill is a type that rolls in one direction and has one stand, the slab thickness can be reduced because of its rolling ability. If so, the sheet bar thickness before finishing (after rough rolling) is increased, and the same problems as those in the above a) and b) occur.
If two or more rough rolling mills are provided, it is disadvantageous in terms of equipment cost. If a reverse-type rough rolling mill is installed, long tables are required before and after the rough rolling mill, and it is necessary to devise to reduce the equipment length and the required length of the building.
In the case of manufacturing a thin plate, the temperature of the strip becomes uneven (the temperature of the portion near the rear end decreases, etc.) after waiting for the rough rolling after the finish rolling, which makes it impossible to perform the preferable finish rolling. There is also the inconvenience.

The present invention solves the above-mentioned problems (1) to (4) and provides a continuous casting hot rolling equipment and a method of using the same, which are preferable in terms of product quality, production capacity and cost. It is a thing.

[0009]

The continuous casting hot rolling equipment according to claim 1 heats the slab obtained by continuous casting as described above by finish rolling without cooling (that is, at a high temperature). A continuous casting hot rolling equipment capable of manufacturing a rolled sheet, including a tunnel type heating furnace, a one-stand reverse rough rolling machine, and a coil box (sheet bar) between a continuous casting machine and a finish rolling machine. Of winding and rewinding)
Arrange in this order, and install a coiler on the downstream side of the finishing mill.
And wind it further downstream by the coiler.
Thickness that can be stacked by cutting boards that do not have
It is characterized by arranging plate refining equipment . Thick plate refining
Examples of locations on the downstream side where equipment is installed include winding
At the rear of the machine (on the extension of the line to the downstream side),
Right angle to the line from near the output table (cooling device)
It is appropriate to use a side part divided into two parts. Thick plate refining equipment
Bibi is a dividing shear, leveler, cooling
Bed, pillar, etc.

With this equipment, a hot rolled sheet can be manufactured as follows. The slab obtained by the continuous casting machine is first heated to a uniform temperature in a tunnel type heating furnace,
The sheet bar is roughly rolled by making a plurality of passes with a reverse type rough rolling machine to obtain a sheet bar, which is once wound in a coil box and then passed through a finishing rolling machine to finish a hot rolled sheet.

Since the combination of the constituent equipments is optimum, this equipment exhibits the following unique actions which are preferable in terms of product quality, production capacity and cost. That is, because the rough rolling mill is arranged in front of the finishing rolling mill,
Even when thick slabs (slabs) are manufactured by a continuous casting machine, it is possible to reduce the load on the rolls of the finishing mill, and thus it is possible to manufacture hot-rolled sheets with high surface quality. Become. Since the rough rolling mill is of the reverse type, the same measure can be taken even if the slab is considerably thick by appropriately determining the number of passes. Since there is only one rough rolling mill installed, there are few disadvantages in terms of equipment cost.

Since the hot-rolled sheet can be manufactured from a thick slab as described above, it is possible to increase the production capacity. For example, by using a slab with a thickness of 100 mm or more (generally, a width of about 1200 mm) as a material, it is not difficult to produce 1.5 million tons or more per one strand per year.

Since the tunnel type heating furnace is used instead of the walking beam type, it is possible to avoid the generation of skid marks due to the contact of a certain part of the slab with the water cooling part. That is, since a non-uniform temperature distribution does not occur in the slab, the rolling load becomes constant, and a hot-rolled sheet with excellent sheet thickness accuracy can be produced. There is no inconvenience that the coil length is restricted due to the limitation of the size of the furnace body.

Since a coil box is provided between the rough rolling mill and the finish rolling mill, heat dissipation from the sheet bar before finish rolling can be prevented and its temperature can be kept substantially uniform. It can be thinned smoothly. ・ Because of the equipment for refining thick plates,
In addition to being able to manufacture rolled sheets (hot rolled coils),
It is also possible to manufacture thick plates with a thickness of about 12-40 mm
become. Continuously cast slabs are roughed by a reverse rough rolling mill.
Roll and, if necessary, how many stands in the finishing mill
Use a slab of the above thickness and use it for purification.
Adjusting the length, correcting the shape, cooling, piling, etc.
Because it can With this continuous casting hot rolling equipment
As mentioned above, a plate with a thickness of about 1 to 12 mm is manufactured.
Possible (However, claim 2 for plates with a thickness of 2 mm or less
It is recommended to use the seat bar heater described in
With this equipment, it is wide from 1mm to 40mm.
It will be possible to produce plates with a range of thicknesses. Thick plate refining equipment
The range of products that can be manufactured expands just by having the equipment
Therefore, it can be said that the increase in merit compared to the cost is remarkable.
It

The continuous casting hot rolling equipment according to claim 2 is further characterized in that an induction heating type sheet bar heater is arranged between the coil box and the finish rolling mill.

By arranging the seat bar heater in this manner, even a thin plate having a thickness of 2 mm or less can be smoothly manufactured. When a plate of 2 mm or less is manufactured by finish rolling, the temperature of the sheet bar decreases during the rough rolling and the waiting time after that (before finish rolling), and even if a coil box is used, the outer and inner winding parts of the coil This is because the temperature drops in the vicinity of the front and rear ends corresponding to the above, and the temperature of the coil can be made preferable by using the sheet bar heater. Since it is not necessary to set the heating temperature in the tunnel type heating furnace to a higher value in anticipation of the temperature drop before finish rolling, it is possible to reduce the thermal load on the furnace and prolong the life of the refractory.

Since an induction heating type sheet bar heater is used, this facility also has the following advantages. That is, unlike an ordinary heating furnace that heats by raising the ambient temperature, since an induction heater that directly supplies heat energy to the seat bar is used, it is possible to add high heating capacity while making the heater small. It is easy to do. That is, the heater does not have to be a large one that covers the entire seat bar, but can be a small one that is arranged at the passage position of the seat bar.

Since the output of the induction heating type heater is easy to control, it is possible to appropriately select how to use the heater according to the plate thickness and other rolling conditions.

Since the output of the induction heating type heater is easy to control, in this equipment, a part of the series of coils is heated so that a part thereof is not heated or the degree of heating is increased or decreased. As a result, the temperature of the entire coil before finish rolling can be made uniform. Therefore, it is also possible to use the seat bar when the coil box is used as described above, by strongly heating only the vicinity of the front and rear ends.

In the continuous casting hot rolling equipment according to claim 3, the line core after the reverse type rough rolling mill is offset with respect to the line core of the continuous casting machine and the tunnel type heating furnace (that is, the intervals are reduced). And arranged in parallel).

When the reverse type rough rolling mill is arranged as described above, a long table of several tens of meters is required before and after the rough rolling mill, but in the case of this equipment, only the length of the table is required. The length of the entire equipment and the required length of the building can be shortened. By arranging the line cores of the continuous casting machine and the tunnel type heating furnace and the line cores of the reverse type rough rolling machine after shifting, the table provided in the front part of the rough rolling machine is located adjacent to the tunnel type heating furnace. Because it can be placed in. That is, by arranging the tunnel type heating furnace and the table in front of the rough rolling mill, which have a considerable length to each other, in parallel at adjacent positions, instead of arranging them in series on a straight line, only the length of the table is increased. The equipment length can be shortened.

In the continuous casting hot rolling equipment according to claim 4, two lines of the continuous casting machine and the tunnel type heating furnace are arranged, and a line core after the reverse type rough rolling machine is provided between the two lines. Is characterized by.

This equipment is also one in which the line core after the rough rolling mill is offset with respect to the line core of the continuous casting machine and the tunnel type heating furnace. Therefore, the equipment length and the required length of the building are the same as above. It has the feature that it can be shortened. In addition, this equipment has two lines of continuous casting machine and tunnel-type heating furnace, and a line core after the rough rolling machine is installed between both lines, so it is possible to achieve annual production capacity of 3 million tons. it can.

[0024]

[0025]

The continuous casting hot rolling method according to claim 5, 請
A method for producing a hot-rolled sheet by the continuous casting hot-rolling equipment according to any one of claims 1 to 4, casting a slab having a thickness of 100 to 140 mm by a continuous casting machine, and cutting,
After heating the slab in a tunnel type heating furnace,
The thickness is 20 by making 3 passes on the reverse type rough rolling mill.
To obtain a sheet bar ～40Mm, and further using a coil box and kept the sheet bar rice planting, the hot-rolled sheet having a thickness of 1.0~2.0mm using finishing mill, above
It is characterized in that it is wound by a coiler and is not passed through the above-mentioned purification equipment .

Regarding the production of the hot-rolled sheet as described above using the facilities of claims 1 to 4 , there are the following preferable actions. That is: A hot-rolled sheet having a thickness of 1.0 to 2.0 mm can be smoothly manufactured from a slab having a thickness of 100 to 140 mm by continuous casting. Even if the slab is a slightly thick steel slab of 100 to 140 mm, the reverse type rough rolling machine is used to obtain a thickness of 20 to
Since a 40 mm sheet bar is manufactured once, a thickness of 1.0 to 2.0 m can be obtained by an ordinary finishing rolling mill with about 6 stands.
It is because it is not difficult to roll to m. Thickness 20 ~
If a 40 mm sheet bar is used as a hot-rolled sheet having a thickness of 1.0 to 2.0 mm, the load on the roll of the finish rolling mill is not too high, and therefore the roll is less worn.

High-quality thin hot rolled sheets can be manufactured. As described above, in addition to being able to reduce the load on the rolls of the finish rolling mill and performing smooth rolling, the slab can be heated uniformly without a skid mark by a tunnel-type heating furnace, and heat retention by a coil box
It can afford to thus finish rolling prior to sheet bar longitudinally uniform and proper temperature without unevenness, but the reason thereof.

Since the hot-rolled sheet is manufactured from a slab having a thickness of 100 to 140 mm, it is possible to increase the production capacity, and it is not difficult to produce more than 1.5 million tons per strand per year.

Since the slab is heated by a tunnel type heating furnace instead of a walking beam type, as described above, the slab can be heated uniformly without skid marks to improve the plate thickness accuracy. There is also no inconvenience that the coil length is restricted due to the dimensional limitation of the above.

The continuous casting hot rolling method according to claim 6 is:
A continuous casting hot rolling method for producing a hot rolled sheet by the continuous casting hot rolling equipment according to any one of claims 1 to 4, wherein a slab having a thickness of 100 to 160 mm is cast by a continuous casting machine and cut. By heating the slab in a tunnel-type heating furnace, rolling it in a reverse rough rolling mill, or by further rolling it in a finishing rolling mill, the thickness 1
Make a thick plate of 2 to 40 mm and wind it with the above coiler.
It is characterized in that it is passed through the above-mentioned purification equipment without being removed.

According to such a method, it is possible to manufacture the thick plate in the following preferable modes. That is, based on a slab having a sufficient thickness, it is possible to manufacture a thick plate having excellent mechanical properties by taking a sufficient reduction ratio.

Since it is passed through the refining equipment, it is possible to meet the requirements regarding the length and shape accuracy of the thick plate to be manufactured by a series of steps.

Since the thick plate is manufactured by the equipment capable of manufacturing the hot rolled coil (equipment according to claim 5), even if the production amount of the thick board is small, the product (thick board may be produced depending on the equipment cost. There is little fear that the price will be raised.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows one mode for carrying out the invention.
To introduce. FIG. 1 (a) is a side view schematically showing the entire continuous casting hot rolling equipment 1 for producing hot rolled steel sheet,
The same figure (b) is the top view.

The continuous casting hot rolling equipment 1 is equipment for producing a hot coil (hot rolled steel sheet Ac) by rolling a slab (slab Aa) produced by continuous casting while hot. In order to exert such a function, the equipment 1 includes, as shown in FIG. 1A, a continuous casting machine 11, a cutting machine 12, a heating furnace 13,
A rough rolling mill 15, a coil box 16, a sheet bar heater 17, a finish rolling mill 18, a runout cooling device 19 and a coiler (winder) 20 are arranged in this order.

The following types of equipment are arranged in the equipment 1. First, as the heating furnace 13, a so-called tunnel type heating furnace of a type having a plurality of slabs Aa and sequentially transferring them in the longitudinal direction is adopted. If this type, slab A during transfer
Since it is impossible that a certain part on a is in contact with the water cooling member for a long time, no skid mark is generated on the slab Aa.
The total length of the heating furnace 13 is about 150 m, and a traverse carriage 14 capable of feeding the slab Aa in the direction (width direction) perpendicular to the longitudinal direction is provided at the rear end portion. Rough rolling mill 15
Although it is a one-stand type, it is of a reverse type and is provided with a table 15a having a length of about 80 meters along with an edger 15b at its front part so that the rolled material can be reversed to perform a plurality of passes of rolling. As the seat bar heater 17, an induction heating type device is provided which energizes a wire coil to generate an AC magnetic field, and generates a eddy current or the like by an electromagnetic induction action on the sheet bar Ab after rough rolling passing nearby to generate heat. is doing. The finish rolling mill 18 is a general one having 6 stands. The cutting machine 12 is of a torch type, but may be of another type such as a shearing type (shear).

The line core was arranged in a straight line from the continuous casting machine 11 to the heating furnace 13.
The equipment from the coiler 20 to the coiler 20 has line cores arranged on another straight line parallel to the heating furnace 13 and the like. This is because if the offset is performed in this way, the total length of the equipment 1 can be shortened by the length of the table 15a in the front part of the rough rolling mill 15, as compared with the case where the offset is not performed.

In the continuous casting hot rolling equipment 1 thus constructed, for example, the thin hot rolled steel sheet Ac is manufactured as follows.
Can be produced. That is, 1) In the continuous casting machine 11, a so-called medium slab Aa having a thickness of 120 mm (or an arbitrary thickness of 100 to 140 mm) and a width of about 1200 mm is cast. The slab Aa is cut by the cutting machine 12 every 16 m in length.

2) The slab Aa after cutting is uniformly heated to 1100 ° C. in the tunnel-type heating furnace 13, and the trolley 14 is used.
It is sent to the table 15a of the rough rolling mill 15 by.

3) In the rough rolling mill 15, the edger 15b is placed on the entry side, and descaling is performed to carry out 3-pass rolling to obtain a thickness of 30 mm (or 20 to 4).
The sheet bar Ab having an arbitrary thickness of 0 mm is used.

4) The sheet bar Ab is once wound around the coil box 16 to suppress the temperature drop before finish rolling. The sheet bar Ab exiting the rough rolling mill 15 has a temperature of about 1060 ° C., and in the coil box 16, it is 10 at the outer winding portion.
30 ℃, 1050 ℃ in the middle part, 1010 ℃ in the inner winding part
Expected to be around.

5) In order to obtain a steel plate Ac having a thickness of 2 mm or less, the coil box 16 is used to remove the sheet bar A.
When unwinding b, the sheet bar heater 17 is used in order to ensure temperature uniformity over the entire length. That is, at the front end portion and the rear end portion of the seat bar Ab, high electric power is applied to the heater 17 to heat the seat bar Ab strongly and to heat it weakly near the central portion, so that the end portion of the seat bar Ab is extended. Then, the temperature is raised to about 1100 ° C., which is almost uniform.

6) The heated sheet bar Ab is cut at the tip crop with a crop shear (not shown) installed in front of the finish rolling mill 18, descaled, and successively passed through the finish rolling mill 18. , Thickness 1.0 mm (or 1.
A hot rolled steel sheet Ac having an arbitrary thickness of 0 to 2.0 mm) is finished. The temperature of the steel sheet Ac is 850 at the exit side of the finish rolling mill 18.
It becomes about 650 ° C. after passing through the cooling device 19 and before being wound around the coiler 20. Since the entire length of the sheet bar Ab is kept at a uniform temperature by the sheet bar heater 17, finish rolling is performed uniformly and stably, and a stable hot rolled hot rolled steel sheet can be obtained.

The above-mentioned production brings about the following merits in this equipment 1. That is, a) Since the medium-thickness slab Aa having a thickness of about 120 mm is used as a material, one strand of the continuous casting machine can produce about 1.5 million tons per year.

B) Thickness 1 which has been particularly demanded in recent years
It is possible to smoothly produce a hot-rolled steel sheet having a size of about mm.

C) The tunnel-type heating furnace 13 that does not generate skid marks on the slab Aa is used, and the rough rolling mill 15 is passed in three passes to reduce the plate thickness of the sheet bar Ab for finish rolling. High-quality hot rolled steel sheet can be produced based on the fact that the load of 18 is small and the temperature of the sheet bar Ab before finish rolling is made uniform by using the sheet bar heater 17 or the like.

D) Compared to the conventional continuous casting hot rolling equipment shown in FIG. 4, the production capacity and the product can be obtained by only slightly adding the equipment such as the rough rolling machine 15 of one stand, the coil box 16 and the sheet bar heater 17. There are great benefits in terms of both quality. The equipment cost is expected to increase by about 20% compared to the equipment shown in Fig. 4, while the production capacity is expected to increase by almost 50%.

Next, FIG. 2 shows another mode for carrying out the invention. FIG. 2 is a plan view showing the continuous casting hot rolling equipment 2. This equipment 2 is also for producing a hot-rolled steel sheet by roughly rolling a continuously cast slab and finish rolling it while hot. A coil box 46 and induction heating type sheet bar heaters 47, 6 are provided after the reverse type rough rolling mill 45.
There is no difference from the equipment 1 shown in FIG. 1 in that the finish rolling mill 48 of the stand, the run-out cooling device 49, and the coiler 50 are sequentially arranged.

However, this facility 2 is characterized in that two sets of devices for continuous casting and slab heating are arranged on the upstream side of the rough rolling mill 45 with an offset. That is, the combination of the continuous casting machine 21, the cutting machine 22 and the tunnel type heating furnace 23 arranged in a straight line, and the continuous casting machine 31, the cutting machine 32 and the tunnel type heating furnace 33 having the same specifications as those are arranged in a straight line. The other combination is arranged in parallel at an interval, and the equipments after the rough rolling mill 45 are arranged in the center of the two sets with each set in parallel with the line core. The heating furnaces 23 and 33 and the front table 45a of the rough rolling mill 45 are connected by a traverse carriage 24.

In this equipment 2, since the equipment after the rough rolling mill 45 is arranged offset from the two sets of equipment up to the heating furnaces 23 and 33, like the equipment 1 of FIG. The length of the entire equipment could be shortened by the length of the front table 45a. In addition, continuous casting machine 21.3
Since it has two units 1, it is possible to produce about 3 million tons per year.

Next, FIG. 3 shows a continuous casting hot rolling equipment 1 '(plan view) as still another embodiment relating to the implementation of the invention. This continuous casting hot rolling 1'includes the equipment configuration of the continuous casting hot rolling equipment 1 shown in FIG. 1, and includes the finish rolling machine 18, the runout cooling device 19, and the coiler 2 described above.
The thick plate refining equipment 70 as shown in the drawing is additionally arranged on the downstream side following the zero. As the plate refining equipment 70,
A dividing shear 71 that cuts the plate and adjusts its length, a leveler 72 that corrects the plate shape by light pressure reduction, and sends the plate in the lateral direction (direction perpendicular to the feeding direction up to that point). A cooling bed 73 for cooling and a pillar 74 for stacking the manufactured plates are provided. Each part of the reference numerals 75a, 75b, 75c between them is a carrying table. As shown by the broken line in the figure, another set of the table 73 'and the pillar 74' are placed in parallel with the cooling bed 73, the pillar 74, etc.
It may be arranged together with 5c '.

In the continuous casting hot rolling equipment 1'followed by the thick plate refining equipment 70, thin hot rolled steel sheets are manufactured and the coiler 2 is used as described above for the continuous casting hot rolling equipment 1.
It is also possible to manufacture a steel plate called a thick plate that can be wound around 0 (or the coilers 20 'arranged side by side) while having a thickness of 12 mm or more and 40 mm or less.
The procedure for producing a thick plate having a thickness of 30 mm using the equipment 1'of FIG. 3 is as follows, for example.

1) A continuous casting machine 11 (see FIG. 1, the same applies hereinafter) is used to cast a slab having a thickness of 150 mm, and a cutting machine 12 cuts the slab at intervals of about 5 m.

2) Tunnel-type heating furnace 1 for the slab after cutting
After heating within 3, the rough rolling machine 15 performs rough rolling in 3 passes to make the plate thickness 50 mm.

3) Without using the coil box 16 and the sheet bar heater 7, crop cutting is performed as necessary, and descaling is performed and the sheet is passed through the finish rolling mill 18 to obtain a steel sheet having a thickness of 30 mm. To
Since the plate is thick and the temperature drop is small, the coil box 16 and the seat bar heater 7 generally do not need to be used. In the finish rolling mill 18, the number of stands to be used is appropriately determined according to the plate thickness and steel type. If the reduction of only the rough rolling mill 15 is sufficient, all the stands of the finish rolling mill 18 may be threaded with plates.

4) The rolled plate (thick plate) is sent to the thick plate refining facility 70 without being wound up. That is, since the plate is stretched around 25 m by rolling, the thick plate refining equipment 7
Of 0, the length is first adjusted to about 12 m by the dividing shear 71, the shape is further adjusted by the leveler 72, cooled by the cooling bed 73, and piled up on the pillar 74 to wait for shipment.

In this way, by using the continuous casting hot rolling equipment 1'that can produce thin hot rolled steel sheets, it is possible to efficiently produce thick plates with sufficient quality at relatively low cost. can do. It is also easy to switch the target of production between a thin hot rolled steel plate and a thick plate.

FIG. 3 also shows the layout of the factory building, as well as the continuous casting hot rolling equipment 1'and the equipment related thereto. A building 3 in the drawing is a building of a continuous casting hot rolling mill equipped with an overhead crane 3a together with the above-described equipment 1 ', and a building 4 adjacent to it is an overhead crane 4
It is a building of a plank shipping factory, which is equipped with a and carries out planks stacked on the pillar 74. Also, the coiler 20
From the side of the conveyor 6 that conveys the coil of hot rolled steel sheet
1.62 extends to the building 5 of the cold rolling mill.

[0060]

EFFECTS OF THE INVENTION The continuous casting hot rolling equipment according to claim 1 has the following effects which are preferable in terms of product quality, production capacity and cost. That is, since the rough rolling mill is provided before the finishing rolling mill, the load on the rolls of the finishing rolling mill can be reduced, and a hot-rolled sheet with high surface quality can be manufactured. Since the rough rolling mill is of the reverse type, it can perform rough rolling even for thick slabs, and because the number of arrangements is only one, the equipment cost can be kept within a reasonable range. .

Since the hot rolled sheet can be manufactured from a thick slab, it is possible to increase the production capacity.

Since a tunnel type heating furnace is used,
As a result of avoiding generation of skid marks on the slab, it is possible to produce a hot-rolled sheet with excellent sheet thickness accuracy. There is no inconvenience that the coil length is restricted due to the restriction on the size of the furnace body.

Since the coil box is provided between the rough rolling mill and the finish rolling mill, heat dissipation of the sheet bar before finish rolling can be prevented and its temperature can be kept substantially uniform. It can be thinned smoothly. ・ Addition that it is possible to manufacture hot rolled sheets (hot rolled coils)
It is also possible to manufacture thick plates, so from thin plates to thick plates.
It is possible to manufacture a wide range of plates with. Equipment cost
It is said that the improvement in production performance is more remarkable than the increase in
There is also an advantage.

Since the continuous casting hot rolling equipment according to claim 2 is provided with an induction heating type sheet bar heater between the coil box and the finish rolling mill, further: -waiting during rough rolling and before finish rolling Even if a temperature drop occurs in the seat bar over time, the temperature can be again favored by the seat bar heater, so that even a thin plate having a thickness of 2 mm or less can be smoothly manufactured. Since there is no need to set the heating temperature in the tunnel type heating furnace to a high level, there is also an advantage that the refractory life of the furnace can be extended.

Since an induction heating type is used as the seat bar heater, it is easy to provide a high heating capacity while making the heater small.

Similarly, since the induction heating type heater is adopted, it is possible to appropriately select whether or not to use the heater according to the rolling conditions, and to reduce the manufacturing cost.

Since the induction heating type heater can quickly switch between the heating start when the output is on and the heating stop when the output is off, a part of the series of coils is heated and a part of the coil is unheated or heated. Depending on how strong or weak you are,
It is possible to efficiently equalize the temperature of the entire coil before finish rolling.

With the continuous casting hot rolling equipment according to claim 3,
The length of the entire equipment and the required length of the building can be shortened by the length of the table provided at the front of the rough rolling mill.

According to the continuous casting hot rolling equipment of claim 4, not only the equipment length and the required length of the building can be shortened but also a high production amount can be brought about.

[0070]

In the continuous casting hot rolling method according to claim 5 ,
In particular, it has the following effects. That is: A hot-rolled sheet having a thickness of 1.0 to 2.0 mm can be smoothly produced (that is, without applying an excessive load to the finish rolling mill) from a slab having a thickness of 100 to 140 mm obtained by continuous casting.

[0072] In addition to being able to suppress the load-finishing mill, heating furnace, since it attained the uniformity of Oite rolling temperature in the coil box, it is possible to manufacture also high quality for thin hot-rolled sheet.

Since a thick slab is used as the material, the quantitative production capacity is also high.

Since a tunnel type heating furnace is used,
There is no inconvenience that the coil length is restricted due to the limitation of the size of the furnace body.

The continuous casting hot rolling method according to claim 6 has the following effects. -Based on a slab having a sufficient thickness, it is possible to produce a thick plate having excellent mechanical properties by taking a sufficient reduction ratio.

A thick plate that satisfies the requirements for length and shape accuracy can be efficiently produced while taking advantage of the facility cost.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the invention, in which FIG. 1 (a) shows a continuous casting hot rolling equipment 1 for producing a hot rolled steel sheet.
Is a side view schematically showing the whole, and (b) is a plan view thereof.

FIG. 2 is a view showing another embodiment relating to the implementation of the invention, and is a plan view schematically showing a continuous casting hot rolling equipment 2.

FIG. 3 is a plan view showing a continuous casting hot rolling equipment 1 ′ as still another mode for carrying out the invention.

FIG. 4 is a schematic side view of a conventional general continuous casting hot rolling equipment (called a CSP).

[Explanation of symbols]

1.1 '/ 2 continuous casting hot rolling equipment 11.21.31 Continuous casting machine 13 ・ 23 ・ 33 Tunnel type heating furnace 15.45 Reverse type rough rolling mill 16 ・ 46 coil box 17.47 Induction heating type seat bar heater 18.48 Finishing mill 20.50 coiler 70 Thick plate refining equipment 71 Dividing Shear 72 Leveler 73 Cooling bed 74 Piler

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 63-132703 (JP, A) JP 63-101001 (JP, A) JP 11-239804 (JP, A) JP 10- 277601 (JP, A) JP 10-175001 (JP, A) JP 9-192706 (JP, A) JP 8-267101 (JP, A) JP 7-308701 (JP, A) JP-A-7-185603 (JP, A) JP-A-7-80509 (JP, A) JP-A-7-80508 (JP, A) JP-A-6-320202 (JP, A) JP-A-6-226302 (JP, A) JP-A-5-104104 (JP, A) JP-A-4-46601 (JP, A) JP-A-2-84201 (JP, A) JP-A-2-37903 (JP, A) ( 58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 1/26 B21B 1/38 B21B 1/46 B21B 45/00

Claims (6)

(57) [Claims] 1. A continuous casting hot rolling equipment capable of producing a hot rolled sheet by finish rolling without cooling a slab obtained by continuous casting, comprising a continuous casting machine and a finish rolling machine. A tunnel-type heating furnace, a one-stand reverse rough rolling mill, and a coil box are arranged in this order, and a coiler is installed on the downstream side of the finishing rolling mill,
On the downstream side, a plate that is not wound by the coiler
We have equipment for refining thick plates that can be cut and stacked.
The continuous casting hot rolling equipment is characterized by being installed. 2. Between the coil box and the finish rolling mill,
The continuous casting hot rolling equipment according to claim 1, further comprising an induction heating type sheet bar heater. 3. The continuous casting hot rolling facility according to claim 1, wherein the line cores of the reverse rough rolling mill and the subsequent ones are offset from the line cores of the continuous casting machine and the tunnel heating furnace. . 4. A continuous casting machine and a tunnel type heating furnace are provided in two.
The continuous casting hot rolling equipment according to claim 3, wherein the hot rolling equipment is arranged in a line, and a line core after the reverse rough rolling mill is provided between the two lines. 5. The continuous according to any one of claims 1 to 4.
Continuous casting hot rolling method for producing hot rolled sheet by casting hot rolling equipment
And cast a slab with a thickness of 100-140 mm with a continuous casting machine.
Build, cut, and add the slab in a tunnel type heating furnace.
After heating it, let it pass through a reverse rough rolling mill for 3 passes
Obtain a sheet bar with a thickness of 20-40 mm, and keep the sheet bar warm by using a coil box.
In addition, using a finishing rolling mill, the thickness is 1.0 to 2.0 mm.
The hot-rolled sheet of
A continuous casting hot rolling method characterized by not passing through equipment. 6. The continuous according to any one of claims 1 to 4.
Continuous casting hot rolling method for producing hot rolled sheet by casting hot rolling equipment
And cast a slab with a thickness of 100-160 mm with a continuous casting machine.
Build, cut, and add the slab in a tunnel type heating furnace.
After heating, rolling with a reverse rough rolling mill, or
The thickness of 12
Make a thick plate of ~ 40mm and wind it with the above coiler.
Continuous, characterized by passing through the above refining equipment without
Cast hot rolling method.