CN210023245U - System for producing hot formed steel by continuous casting and rolling - Google Patents
System for producing hot formed steel by continuous casting and rolling Download PDFInfo
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- CN210023245U CN210023245U CN201920621505.8U CN201920621505U CN210023245U CN 210023245 U CN210023245 U CN 210023245U CN 201920621505 U CN201920621505 U CN 201920621505U CN 210023245 U CN210023245 U CN 210023245U
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Abstract
The utility model provides a system for hot forming steel of continuous casting and rolling production. The system comprises: and continuously carrying out rough rolling, finish rolling, cooling, air cooling and thermal forming treatment on the casting blank output by the continuous casting machine to obtain the thermal forming steel. The utility model has compact structure arrangement, short process flow and less investment; the interface between the traditional continuous casting, hot rolling and downstream processes is broken through, and the effective connection of the continuous casting, hot rolling and the downstream processes is realized; the production line fully utilizes the waste heat of the casting blank to roll, and is not provided with or provided with less heating devices; the reheating process of the hot forming steel is cancelled, energy is saved, and the aims of simplifying the process, reducing the cost and improving the efficiency are finally achieved.
Description
Technical Field
The utility model relates to a steel continuous casting and rolling technical field especially relates to a system for hot forming steel of continuous casting and rolling production.
Background
The continuous casting and rolling technology is used for realizing endless rolling, compared with the traditional hot continuous rolling, the continuous casting and rolling technology has the advantages of compact flow, high efficiency and energy conservation, the temperature uniformity of the adopted overlong continuous casting billet is controlled, and the constant tension control is adopted in the constant-speed rolling process, so that the continuous casting and rolling product not only has extremely high dimensional precision, but also has stable mechanical performance, and the continuous casting and rolling technology is an optimal technology for constructing energy-saving and environment-friendly steel product lines. But the application of steel enterprises in various countries to continuous casting and rolling is limited to the production of thin strip steel at present. When thin strip steel is produced by continuous casting and rolling of a thin slab, the requirement of rolling temperature can be met only by heating and temperature compensation of a heating furnace between rough rolling and finish rolling due to thin thickness and rapid temperature drop of the strip steel. Taking the shortest continuous casting and rolling production line ESP as an example at present, the units are arranged into a 3-frame roughing mill and a 5-frame finishing mill, and 12 groups of induction heating units with the power of 3 WM/group are arranged between the roughing mill and the finishing mill so as to meet the requirement of rolling temperature.
The section bars, such as square tubes, round tubes, angle steels, channel steels, C-shaped steels and the like, are widely applied to the fields of buildings, machine manufacturing, steel structure engineering, electric power engineering, agriculture, chemical machinery and the like. The product has the advantages of flexible section size and high compressive strength, and the mechanical property of the steel is fully exerted; the various fittings can be connected in different combination modes, the appearance is attractive, the structural weight can be reduced, and the amount of engineering steel is reduced, so the steel is called as economic and efficient steel. These profiles are currently produced mainly by hot-forming or cold-forming hot-rolled steel sheets. When the hot forming processing is adopted, the hot rolled steel coil needs to be uncoiled, straightened and reheated, then forming processing is carried out, a series of equipment such as a steel coil uncoiling machine, a pinch roll, a straightening machine, a heating furnace and the like need to be configured on a production line, and the investment cost is high; uncoiling, threading and heating are needed during production, so that the production efficiency is influenced; the working procedures are various and discontinuous, and the production speed and the product quality are easily influenced by the front and the rear working procedures, thereby influencing the quality of the final product.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcoming of prior art, the utility model aims at providing a system of hot forming steel of continuous casting and rolling production for solve the production of hot forming steel among the prior art and need open a book, wear the area, the process is numerous and discontinuous, and production speed and product quality receive the influence of front and back process easily, thereby influence final product quality scheduling problem.
To achieve the above and other related objects, the present invention provides a system for producing hot formed steel by continuous casting and rolling, comprising a continuous casting machine for casting molten steel into a billet;
the roughing mill group is arranged at the downstream of the continuous casting machine and is used for roughing the strip steel;
the finishing mill group is arranged at the downstream of the rough mill group and is used for finishing the strip steel;
the cooling system after rolling is arranged at the downstream of the finishing mill group and used for cooling the strip steel after rolling; and
and the hot forming unit is arranged at the downstream of the cooling system after rolling and is used for carrying out hot forming treatment on the strip steel.
Optionally, a rough descaling system is arranged upstream of the roughing mill group and used for rough descaling of the strip steel.
Optionally, a fine descaling system is arranged upstream of the finishing mill group and is used for performing fine descaling on the strip steel.
Optionally, a pendulum shear is arranged at the downstream of the roughing mill group and used for cutting off waste billets.
Optionally, a waste pushing device is arranged at the downstream of the pendulum shear and used for collecting the waste blanks cut by the pendulum shear.
Optionally, a heating furnace is arranged upstream of the fine descaling system and used for heating the strip steel.
Optionally, the furnace is selected from an induction furnace.
Optionally, the heating furnace comprises 0-12 groups of heating units which are connected in sequence.
Optionally, a first flying shear is provided upstream of the finishing train for cutting the strip in the event of a fault or accident.
Optionally, the first flying shear is located downstream of the waste ejector.
Optionally, a second flying shear is arranged between the post-rolling cooling system and the hot forming unit and used for cutting off the strip steel in case of a fault or accident.
Optionally, the roughing mill train comprises 1-2 roughing stands connected in series.
Optionally, the finishing mill group comprises 3-4 finishing mill frames connected in sequence.
Optionally, the hot forming unit is at least one selected from a square pipe hot forming unit, a round pipe hot forming unit, an angle steel hot forming unit, a channel steel hot forming unit and a C-shaped steel hot forming unit.
Optionally, the hot-formed steel material includes square pipes, round pipes, angle steels, channel steels and C-shaped steels.
The method for producing the hot formed steel by adopting the system for continuous casting and continuous rolling comprises the following steps: and continuously carrying out rough rolling, finish rolling, cooling after rolling and thermal forming treatment on the casting blank output by the continuous casting machine to obtain the thermal forming steel.
Optionally, the raw material composition of the casting blank is as follows by weight: less than or equal to 0.24 percent of C, less than or equal to 1.6 percent of Mn, less than or equal to 0.55 percent of Si, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of Fe and inevitable impurities.
Optionally, the temperature of the casting blank at the outlet of the continuous casting machine is 1000-1050 ℃.
Optionally, the finishing temperature of the strip steel is not lower than 800 ℃ during finish rolling.
Optionally, after the finish rolling, the strip steel is cooled to 640-660 ℃ after rolling.
Optionally, the hot forming temperature of the strip steel is 580-650 ℃.
Optionally, the strip is heated before the finishing, this heating step being an optional step, depending on the thickness of the strip to be rolled, if necessary, and not if necessary.
Optionally, the strip steel temperature at the finish rolling inlet is 900 ℃ to 970 ℃.
Optionally, the thickness of the casting blank output by the continuous casting machine is 70 mm-110 mm.
Optionally, the thickness of the finish rolled strip steel is 5 mm-30 mm.
Optionally, the continuous casting drawing speed is not less than 5.8 m/min.
Optionally, the strip steel is rough descaled prior to rough rolling.
Optionally, the strip steel is fine descaled prior to finish rolling.
Optionally, after the hot forming process, the strip is cooled to below 100 ℃.
As above, the utility model discloses a system for continuous casting and rolling production hot forming steel has following beneficial effect: the utility model discloses to produce the line with continuous casting and rolling and produce the line group with hot forming steel and link up, adopt short flow, full continuous system production structural steel and direct thermoforming processing. The interface between the traditional continuous casting, hot rolling and downstream processes is broken through, and the seamless connection of the continuous casting, hot rolling and the downstream processes is realized; breaks through the tradition that continuous casting and rolling can only be applied to the production of thin strip steel and is used for producing thick-specification common carbon structural steel; compared with an ESP production line, the steel strip product specification is thicker, the total reduction rate from the casting blank to the product is reduced, and the number of rolling mills can be reduced by at least 1 roughing mill and 1 finishing mill, so that the length of the continuous casting and rolling production line is shortened; because the length of the production line is shortened, the heat loss of the steel strip is reduced, the waste heat of the casting blank can be fully utilized for rolling, and no or few heating devices are arranged; the reheating process of the hot forming steel is cancelled, energy conservation and consumption reduction are realized, and the aims of simplifying the process, reducing the cost, improving the efficiency and realizing green manufacturing are finally achieved.
Drawings
Fig. 1 is a schematic view of a production system according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a production system according to embodiment 2 of the present invention.
Description of numbering:
1-continuous casting machine
2-high-pressure water rough descaling device
3-roughing mill train
4-pendulum shear
5-waste pushing device
6-first flying shear
7-Induction heating furnace
8-high pressure water fine descaling device
9-finishing mill group
10-Cooling device after rolling
11-second flying shear
12-thermoforming unit
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
In order to reduce the manufacturing cost of hot forming steel, improve production efficiency, improve product quality and stability, realize green, stable, continuous, reliable industrial production, the utility model provides a system of hot forming steel is rolled to continuous casting and rolling production aims at breaking upper reaches and low reaches process interface, reduces and produces the line investment, and make full use of casting blank waste heat reduces the heating energy consumption, improves production efficiency.
The utility model discloses a thermoforming machine is including but not limited to from square pipe thermoforming unit, angle steel thermoforming unit, channel-section steel thermoforming unit, C shaped steel thermoforming unit etc..
The utility model discloses the hot forming steel of production includes but not limited to square pipe, angle steel, channel-section steel, C shaped steel etc..
Example 1
In this example, a short-flow, full-continuous production system was used to produce hot-formed steel.
As shown in fig. 1, the production system includes a continuous casting machine 1, a high-pressure water rough descaling device 2, a rough rolling mill unit 3, a pendulum shear 4, a waste pushing device 5, a first flying shear 6 (drum flying shear in this embodiment), an induction heating furnace 7, a high-pressure water fine descaling device 8, a finishing rolling mill unit 9, a cooling device 10 after rolling, a second flying shear 11, and a hot forming unit 12, which are connected in sequence.
The hot forming steel comprises the following raw materials in percentage by mass: 0.12% of C, 0.28% of Mn, 0.1% of Si, 0.012% of P, 0.005% of S, 0.022% of Als, and the balance of Fe and impurities.
The molten steel with the components is cast into a blank in a continuous casting machine 1, the continuous casting stable casting speed is controlled to be 5.8m/min, the thickness of the continuous casting blank is 92mm, and the width of the continuous casting blank is 1450 mm. After roughly descaling by high-pressure water of about 20MPa, the continuous casting blank enters a 1-frame roughing mill for rolling, is heated by an induction heating furnace consisting of 6 groups (with the power of 3.0-3.5 MW/group) of induction heating units, is descaled by high-pressure water of about 20MPa, and is rolled by a 3-frame finishing mill, and the cumulative reduction rate of finish rolling is 68%. In order to meet the mechanical property of the hot-rolled strip steel and avoid the blue-brittle temperature range, after finish rolling, the strip steel is controlled to be cooled to 640-660 ℃ in a cooling section after rolling (namely a cooling device 10 after rolling), then enters a thermal forming unit 12 and is subjected to thermal forming processing at 580-630 ℃, and after the thermal forming is finished, the strip steel is cut into lengths according to the product specification.
Table 1 table of parameters of continuous casting and rolling process of example 1
The equipment between rough rolling and finish rolling, namely the pendulum shear 4 is used for cutting off waste billets at the head and the tail during a continuous casting time and collecting the waste billets through a waste pushing device 5; the induction heating furnace 7 is used for compensating the temperature of the intermediate billet so as to ensure the temperature of a finish rolling inlet; the first flying shears 6 are not used in normal production, but are used for cutting the intermediate billet when a fault or an accident occurs in a process after induction heating in a headless rolling mode, so that waste materials can be removed quickly.
The second flying shear 11 after being cooled after rolling is used in a headless rolling mode, and when a hot forming process fails or is in an accident, the strip steel is cut off, so that waste materials can be conveniently and rapidly removed, and the second flying shear is not used in a normal production mode.
Example 2
In this example, a short-flow, full-continuous production system was used to produce hot-formed steel.
As shown in fig. 2, the production system includes a continuous casting machine 1, a high-pressure water rough descaling device 2, a rough rolling mill group 3, a pendulum shear 4, a waste pushing device 5, a first flying shear 6 (drum flying shear in this embodiment), a high-pressure water finishing descaling device 8, a finishing rolling mill group 9, a cooling device 10 after rolling, a second flying shear 11, and a thermal forming unit 12, which are connected in sequence.
The hot forming steel comprises the following raw materials in percentage by mass: 0.15% of C, 1.2% of Mn, 0.16% of Si, 0.015% of P, 0.009% of S, 0.01% of N, 0.015% of Als and the balance of Fe and impurities.
And casting the molten steel with the components into a blank in a continuous casting machine 1, wherein the continuous casting stable casting speed is 8.3m/min, the thickness of the continuous casting blank is 95mm, and the width of the continuous casting blank is 1450 mm. After roughly descaling the continuous casting slab by high-pressure water of about 20MPa, the continuous casting slab enters a 1-frame roughing mill for rolling, then roughly descales the continuous casting slab by high-pressure water of about 20MPa, and finally rolls the continuous casting slab by a 3-frame finishing mill, wherein the cumulative reduction rate of finish rolling is 65.4%. In order to meet the mechanical property of the hot-rolled strip steel and avoid the blue-brittle temperature range, the strip steel is controlled and cooled to 640-660 ℃ in a post-rolling cooling section after finish rolling, then enters a thermal forming unit and is subjected to thermal forming processing at 580-630 ℃, and the length of the strip steel is cut according to the product specification after the thermal forming is finished.
Table 2 parameter table of continuous casting and rolling process of example 2
| Position of | Continuous casting outlet | Rough rolling outlet | Fine descaling outlet | Finish rolling outlet | Cooling after rolling |
| Temperature of(℃) | 1000～1020 | 1000～1020 | 910～930 | 820～840 | 640～660 |
| Thickness (mm) | 95 | 52 | 52 | 18 | 18 |
| Speed (m/s) | 0.138 | 0.252 | 0.252 | 0.728 | 0.728 |
The swing shear 4 is used for cutting off waste billets at the head and the tail during a continuous casting time and collecting the waste billets through a waste pushing device; the first flying shears 6 are not used in normal production, but are used for cutting the intermediate billet when a fault or an accident occurs in a process after induction heating in a headless rolling mode, so that waste materials can be removed quickly.
The second flying shear 11 after being cooled after rolling is used in a headless rolling mode, and when a hot forming process fails or is in an accident, the strip steel is cut off, so that waste materials can be conveniently and rapidly removed, and the second flying shear is not used in a normal production mode.
In summary, the utility model provides a novel system for producing hot-formed steel by continuous casting and rolling, which has compact structural arrangement, short process flow and less investment; the interface between the traditional continuous casting, hot rolling and downstream processes is broken through, and the effective connection of the continuous casting, hot rolling and the downstream processes is realized; the production line fully utilizes the waste heat of the casting blank to roll, and is not provided with or provided with less heating devices; the reheating process of the hot forming steel is cancelled, energy is saved, and the aims of simplifying the process, reducing the cost and improving the efficiency are finally achieved.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A system for producing hot formed steel by continuous casting and rolling, comprising: a continuous casting machine for casting molten steel into a billet;
the roughing mill group is arranged at the downstream of the continuous casting machine and is used for roughing the strip steel;
the finishing mill group is arranged at the downstream of the rough mill group and is used for finishing the strip steel;
the cooling system after rolling is arranged at the downstream of the finishing mill group and used for cooling the strip steel after rolling; and
and the hot forming unit is arranged at the downstream of the cooling system after rolling and is used for carrying out hot forming treatment on the strip steel.
2. The system of claim 1, wherein a rough descaling system is provided upstream of the roughing mill train for rough descaling the strip steel.
3. The system according to claim 1, characterized in that a fine descaling system is provided upstream of the finishing train for fine descaling the strip steel.
4. The system according to claim 3, wherein a heating furnace is arranged upstream of the fine descaling system and used for heating the strip steel, the heating furnace is selected from induction heating furnaces, and the induction heating furnaces comprise 0-12 groups of heating units which are connected in sequence.
5. The system of claim 1, wherein a pendulum shear is provided downstream of the roughing train for cutting off scrap.
6. The system according to claim 5, characterized in that downstream of the pendulum shears there is provided a waste ejection device for collecting the blanks cut off by the pendulum shears.
7. The system according to claim 1, characterized in that upstream of the finishing train there are first flying shears for cutting the strip in case of a malfunction or accident.
8. The system according to claim 7, characterized in that said first flying shear is located downstream of the reject ejection device.
9. The system of claim 1, wherein a second flying shear is provided between the post-rolling cooling system and the hot forming unit for cutting the strip in case of a fault or accident.
10. The system of claim 1, wherein the roughing mill train comprises 1-2 roughing stands connected in series;
and/or the finishing mill group comprises 3-4 finishing mill frames which are connected in sequence;
and/or the hot forming unit is at least one selected from a square tube hot forming unit, a round tube hot forming unit, an angle steel hot forming unit, a channel steel hot forming unit and a C-shaped steel hot forming unit;
and/or the hot forming steel comprises square pipes, round pipes, angle steel, channel steel and C-shaped steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109985904A (en) * | 2019-04-30 | 2019-07-09 | 中冶赛迪技术研究中心有限公司 | A kind of method and system of continuous casting and rolling production thermoforming steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109985904A (en) * | 2019-04-30 | 2019-07-09 | 中冶赛迪技术研究中心有限公司 | A kind of method and system of continuous casting and rolling production thermoforming steel |
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