Stainless steel double-roller ultra-thin strip cast rolling and online solid solution integrated arrangement structure

Abstract

The invention belongs to the technical field of stainless steel production, and particularly relates to a stainless steel double-roller ultrathin strip cast rolling and on-line solid solution integrated arrangement structure which is sequentially provided with a double-roller cast rolling machine, a hot box, a single-rack four-roller irreversible rolling mill, an on-line solid solution device, an ultrafast cooling device, a flying shear and a coiling machine in the direction of a solid solution stainless steel strip production line. Compared with the prior art, the cast rolling and online solid solution integrated arrangement structure for the stainless steel double-roller ultrathin strip has the advantages that on one hand, waste heat generated after cast rolling is fully utilized, and secondary heating before solid solution is omitted; on the other hand, the process chain is shortened, and the energy consumption of intermediate carrying and storage is reduced; and finally, waste heat can be efficiently recycled, and the waste heat after casting and rolling is used for solution treatment, so that carbon emission is reduced.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel production technology, specifically relating to an integrated arrangement structure for stainless steel twin-roll ultra-thin strip casting and online solution treatment. Background Technology

[0002] Traditional stainless steel production processes suffer from two major drawbacks: high energy consumption and long production cycles. Offline solution treatment requires reheating the cooled steel strip to 1050-1150℃, resulting in significant energy waste, with energy consumption exceeding 130 kgce per ton of steel and generating approximately 0.3 tons of CO2 emissions. While twin-roll casting technology can achieve near-net-shape production, the rapid cooling process after rolling leads to carbide precipitation, which reduces the corrosion resistance of stainless steel. This is especially true for ultra-thin strips, which, due to their large surface area and rapid cooling rate, are more prone to uneven microstructure.

[0003] Currently, twin-roll cast strip steel production involves simple rolling, with subsequent heat treatment done offline. The steel grades produced are carbon steel and silicon steel, lacking the technology to produce stainless steel. While online solution treatment on conventional hot strip rolling lines can indeed save energy, it requires time. Conventional hot strip rolling is fast, so to adapt to online solution treatment, the rolling speed must be reduced. For producing thin strip steel, reducing the speed will lower the rolling temperature, thus affecting product performance and quality, and may even lead to rolling accidents. Reducing the rolling speed will also affect output.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] This invention proposes an integrated arrangement structure for stainless steel twin-roll ultra-thin strip casting and online solution treatment, innovatively integrating twin-roll ultra-thin strip casting and online solution treatment into a single unit. This invention is the first of its kind to create an integrated continuous production line for casting and solution treatment, enabling continuous production from liquid steel to solution-treated finished strip.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A stainless steel twin-roll ultra-thin strip casting and online solution treatment integrated layout structure, wherein a twin-roll casting and rolling mill, a hot box, a single-stand four-roll irreversible rolling mill, an online solution treatment device, an ultra-fast cooling device, a flying shear and a coiler are arranged sequentially along the direction of the solution treatment stainless steel strip production line.

[0008] Preferably, pinch rolls are provided before the single-stand four-high irreversible rolling mill.

[0009] Preferably, the hot box is filled with an inert protective gas.

[0010] Preferably, the solid solution furnace in the online solid solution apparatus uses an induction heating device for induction heating and is equipped with a temperature measuring device.

[0011] Preferably, the induction heating device has a heating capacity greater than 200°C.

[0012] Preferably, a temperature measuring device is provided at the exit of the single-stand four-roll irreversible rolling mill.

[0013] Preferably, the cooling capacity of the ultrafast cooling device is greater than 20°C / s.

[0014] Preferably, an air-cooling softening distance is left between the online solid solution device and the ultra-fast cooling device, with a softening time of 5-15 seconds.

[0015] Preferably, the thickness of the solution-treated stainless steel strip is 0.8-2.0 mm.

[0016] Preferably, the distance from the twin-roll casting mill to the coiler is less than 100m.

[0017] Compared with existing technologies, this invention provides an integrated arrangement structure for stainless steel twin-roll ultra-thin strip casting and online solution treatment. Its innovation is reflected in three aspects: First, it makes full use of the residual heat after casting and rolling, eliminating the need for secondary heating before solution treatment (traditional processes require heating cold strip steel to 1100℃); second, it shortens the process chain and reduces energy consumption for intermediate handling and storage; and third, it achieves efficient waste heat recovery by using the residual heat after casting and rolling for solution treatment, thereby reducing carbon emissions.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an integrated arrangement structure for stainless steel twin-roll ultra-thin strip casting and online solution treatment, provided as an embodiment of the present invention.

[0021] The diagram is shown below:

[0022] 1. Transition ladle; 2. Twin-roll casting and rolling mill; 3. Hot box; 4. Pinch rolls; 5. Single-stand four-roll irreversible mill; 6. In-line solution treatment unit; 7. Ultra-fast cooling unit; 8. Flying shear; 9. Coiler. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, this embodiment of the invention provides an integrated arrangement structure for stainless steel twin-roll ultra-thin strip casting and online solution treatment. Along the direction of the solution-treated stainless steel strip production line, a twin-roll casting mill 2, a hot box 3, a single-stand four-roll irreversible mill 5, an online solution treatment device 6, an ultra-fast cooling device 7, a flying shear 8, and a coiler 9 are arranged sequentially. A pinch roll 4 is provided before the single-stand four-roll irreversible mill 5.

[0025] In the above embodiments, the main production process of the stainless steel twin-roll ultra-thin strip casting and online solution integrated arrangement structure of the present invention is as follows: molten steel → tundish → transition ladle 1 → twin-roll casting and rolling mill 2 → hot box 3 → pinch rolls 4 → single-stand four-roll irreversible rolling mill 5 → online solution treatment device 6 → ultra-fast cooling device 7 → flying shear 8 → coiler 9.

[0026] In the above embodiment, the twin-roll casting mill 2 is located after the transition ladle 1, and the hot box 3 is located after the twin-roll casting mill 2. The hot box 3 is filled with inert protective gas. To ensure smooth strip biting, pinch rolls 4 are installed before the single-stand four-high irreversible mill 5, and also to establish tension with the mill before the coiler 9 bites the strip. An online solution treatment device 6 is installed at the exit of the four-high mill. A temperature measuring device is installed between the single-stand four-high irreversible mill 5 and the online solution treatment device 6. The temperature measuring device and the online solution treatment device 6 form a closed-loop control to accurately control the solution treatment temperature. An ultra-fast cooling device is arranged after the online solution treatment device 6, with an air-cooling softening distance between them. The softening time is 5-15 seconds. The cooling capacity of the ultra-fast cooling device is greater than 20℃ / s. A flying shear 8 is arranged after the ultra-fast cooling device, and the coiler 9 is arranged after the flying shear 8. The distance from the twin-roll casting mill 2 to the coiler 9 is less than 100m.

[0027] This invention provides a stainless steel twin-roll ultra-thin strip casting and online solution treatment integrated arrangement structure that can produce solution-treated stainless steel products with a thickness of 0.8~2.0mm.

[0028] In the above embodiments of the present invention, the solution furnace in the online solution treatment device 6 adopts induction heating, and a temperature measuring device is provided at the outlet of the single-stand four-roll irreversible rolling mill 5, forming a closed loop with the temperature measuring device in the online solution treatment device 6 to accurately control the solution temperature.

[0029] This invention provides an integrated twin-roll casting and online solution treatment structure for ultra-thin stainless steel strips, specifically designed for the production of austenitic and duplex stainless steel strips (thickness 0.8-2.0 mm). This patent innovatively integrates twin-roll casting and online solution treatment technologies. Its core principle lies in utilizing the residual heat of the high-temperature steel strip at the casting exit (mill exit temperature ≥1000℃) to directly perform solution treatment through precise temperature control, eliminating the need for secondary heating. In terms of process design, two key measures achieve technological breakthroughs: first, a controllable heat preservation transition section is set between the casting and solution treatment processes to ensure the steel strip temperature remains stable above the carbide solution temperature (≥1000℃); second, ultra-fast cooling technology (cooling rate ≥20℃ / s) is used to rapidly pass the carbide precipitation sensitive temperature range (800-430℃). This design not only fully utilizes the residual heat from casting and rolling but also solves the problem of temperature uniformity control in continuous production of ultra-thin strip steel through precise temperature-speed coordinated control.

[0030] This invention provides a twin-roll ultra-thin strip casting and online solution treatment integrated structure for stainless steel, addressing the two major pain points of traditional stainless steel production processes: high energy consumption and long production cycles. Offline solution treatment requires reheating the cooled steel strip to 1050-1150℃, resulting in significant energy waste, with energy consumption exceeding 130 kgce per ton of steel and generating approximately 0.3 tons of CO2 emissions. While twin-roll casting technology can achieve near-net-shape production, the rapid cooling process after rolling leads to carbide precipitation, causing a decrease in the corrosion resistance of stainless steel. This is especially true for ultra-thin strip steel, which, due to its large specific surface area and rapid cooling rate, is more prone to uneven microstructure.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A stainless steel twin-roll ultra-thin strip casting and online solution treatment integrated arrangement structure, characterized in that, Along the direction of the solution-treated stainless steel strip production line, a twin-roll casting and rolling mill, a hot box, a single-stand four-roll irreversible rolling mill, an online solution treatment unit, an ultra-fast cooling unit, a flying shear, and a coiler are arranged in sequence.

2. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 1, characterized in that, A pinch roll is provided before the single-stand four-high irreversible rolling mill.

3. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 2, characterized in that, The hot box is filled with an inert protective gas.

4. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 3, characterized in that, The online solution treatment device uses an induction heating device for induction heating in the solution furnace and is equipped with a temperature measuring device.

5. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 4, characterized in that, The induction heating device has a heating capacity of over 200°C.

6. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 5, characterized in that, A temperature measuring device is installed at the exit of the single-stand four-roll irreversible rolling mill.

7. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 6, characterized in that, The ultrafast cooling device has a cooling capacity of more than 20°C / s.

8. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 7, characterized in that, An air-cooling softening distance is left between the online solid solution device and the ultra-fast cooling device, with a softening time of 5-15 seconds.

9. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 8, characterized in that, The thickness of the solution-treated stainless steel strip is 0.8-2.0 mm.

10. The integrated arrangement structure of stainless steel twin-roll ultra-thin strip casting and online solution treatment according to claim 9, characterized in that, The distance from the twin-roll casting mill to the coiler is less than 100m.

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