A method for producing a composite board

Abstract

The application discloses a composite plate production method, comprising the following steps: carrying out shot blasting treatment and heating on a total composite plate; carrying out controlled cooling and temperature measurement on the total composite plate meeting the quality requirements, and if the total composite plate reaches the cooling temperature standard, tearing the total composite plate into two sub-composite plates, and straightening the sub-composite plates; tearing the total composite plate not meeting the quality requirements into two sub-composite plates, heating, controlling cooling and measuring the temperature of the sub-composite plates, and if the sub-composite plates reach the cooling temperature standard, straightening the sub-composite plates. The composite plate production method provided by the application screens out the total composite plates with defects and the total composite plates with defects before controlled cooling, and processes the total composite plates respectively. The method avoids the defects of the existing technology, such as the scratch and the pressure pit of the stainless steel part caused by tearing the total composite plate before shot blasting; and avoids the defect that the total composite plate with defects is damaged when the total composite plate is directly controlled to cool and deforms severely, bulges and arches.

Description

TECHNICAL FIELD

[0001] The present application relates to Composite board heat treatment TECHNICAL FIELD, in particular to a composite plate production method. BACKGROUND

[0002] Stainless steel and carbon steel composite plate not only has the corrosion resistance of stainless steel, but also has good mechanical strength and processing performance of carbon steel, and has been widely used in industries with high load and poor working conditions such as petroleum, chemical industry, salt industry, water conservancy and power.

[0003] In the production process of stainless steel and carbon steel composite plate, in order to protect the stainless steel layer, 4-layer composite plate of carbon steel-stainless steel-stainless steel-carbon steel needs to be rolled first, and the carbon steel needs to be strengthened to improve the performance. In the rolling process, the welds at the edges of stainless steel and carbon steel may be damaged, and the vacuum environment between stainless steel may also be damaged. When the 4-layer composite plate is heated in the heat treatment furnace, the high-temperature air in the furnace will enter the 4-layer composite plate. When quenching and cooling, because the surface of the 4-layer composite plate cools rapidly, the thermal expansion and cold contraction of stainless steel and carbon steel change in volume, and at the same time, because of the hot air between the stainless steel, it will cause the composite plate to deform and bulge, and the arched composite plate will burst and damage the water cooling equipment.

[0004] In order to avoid damage to the water cooling equipment of the 4-layer composite plate, it is torn into stainless steel and carbon steel double-layer composite plate before quenching. Because of the need for lifting, shot blasting and other operations, the stainless steel layer is easy to produce scratches, indentation and other quality defects, causing the composite plate to be scrapped, and the yield is low, so the carbon steel connecting plate needs to be welded. The connecting plate will fall off during the heat treatment process and damage the heat treatment equipment, so the technical requirements are high, resulting in complex composite plate production process, low efficiency and low yield. SUMMARY

[0005] In view of the above problems, the present application is proposed to provide a composite plate production method which overcomes the above problems or at least partially solves the above problems.

[0006] A composite plate production method is provided, which is applied to the processing of total composite plate and sub composite plate. The sub composite plate is a double-layer plate composed of carbon steel layer and stainless steel layer, and the total composite plate is a four-layer plate composed of two sub composite plates through stainless steel layer. The composite plate production method comprises:

[0007] The total composite plate is subjected to shot blasting treatment and heating.

[0008] The total composite plate meeting the quality requirements is subjected to controlled cooling and temperature measurement. If the total composite plate reaches the cooling temperature standard, the total composite plate is torn into two sub composite plates, and the sub composite plates are straightened.

[0009] The total composite plate not meeting the quality requirement is torn into two sub-composite plates, the sub-composite plates are heated, controlled in cooling and measured in temperature, if the sub-composite plates meet the cooling temperature standard, the sub-composite plates are straightened.

[0010] Optionally, the shot blasting treatment comprises: performing shot blasting treatment on the surface of the carbon steel layer of the total composite plate.

[0011] Optionally, after the shot blasting treatment, the method further comprises: if the carbon steel layer of the four-layer composite plate has surface quality defects or weld quality defects, performing repair.

[0012] Optionally, the repair comprises: shot blasting treatment, grinding and repair welding.

[0013] Optionally, the quality requirement is that the total composite plate has no cracking or bulging.

[0014] Optionally, the heating comprises: the total composite plate or the sub-composite plate enters a heat treatment furnace along a flow water production line and is heated to 800-900 DEG C, and is kept for 10-30 minutes.

[0015] Optionally, the controlled cooling comprises: the total composite plate or the sub-composite plate enters a water cooling system of a quenching machine along the flow water production line and is cooled.

[0016] Optionally, the water cooling system comprises a first flow control area, a second flow control area, a third flow control area, a fourth flow control area, a fifth flow control area and a sixth flow control area arranged along the flow water production line in sequence; the water amount of the first flow control area is set to 400-600 m 3 / h, the water amount of the second flow control area is set to 800-1200 m 3 / h, the water amount of the third flow control area is set to 400-600 m 3 / h, the water amount of the fourth flow control area is set to 800-1200 m 3 / h, the water amount of the fifth flow control area is set to 400-600 m 3 / h, and the water amount of the sixth flow control area is set to 800-1200 m 3 / h.

[0017] Optionally, the ratio of the lower header flow rate to the upper header flow rate of the water cooling system is 1.5-2.2.

[0018] Optionally, the cooling temperature standard is that the temperature is reduced to 600-650 DEG C.

[0019] The technical scheme provided in the embodiment of the application has at least the following technical effects or advantages:

[0020] The composite plate production method provided by the embodiment of the present application screens the total composite plate with defects before controlled cooling, and after tearing and separating into double-layer sub-composite plates, executes quenching, temperature measurement and straightening; and the total composite plate without defects directly executes controlled cooling, temperature measurement, tearing and separating into double-layer sub-composite plates and straightening. The defects such as scratches and pressure pits of the stainless steel layer caused by tearing and separating the total composite plate into sub-composite plates and then executing shot blasting are avoided; the harm of the falling-off of the welding connecting plate to the equipment in the production process is avoided; and the defect that the total composite plate with defects is damaged due to the severe deformation bulging and arching when directly executing controlled cooling is avoided.

[0021] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several drawings to refer to the same or like components. In the drawings:

[0023] Figure 1 Process diagram of the composite plate production method in the embodiment of the present application;

[0024] Figure 2 Flow chart of the composite plate production in the embodiment of the present application;

[0025] Figure 3 Schematic diagram of the production line in the embodiment of the present application;

[0026] Among them, 1 is a gantry crane, 2 is a shot blasting machine, 3 is a plate turnover machine, 4 is a heat treatment furnace, 5 is a quenching machine, 6 is a pyrometer, and 7 is a straightening machine. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings.

[0028] Various structural schematic diagrams according to the embodiment of the present application are shown in the drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and certain details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0029] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with specific embodiments. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0030] The present application provides a composite plate production method, please refer to Figure 1 , Figure 1 The present application provides a composite plate production method, please refer to

[0031] The total composite plate is subjected to shot blasting treatment and heating.

[0032] The total composite plate that meets the quality requirements is subjected to controlled cooling and temperature measurement. If the total composite plate reaches the cooling temperature standard, the total composite plate is torn into two sub-composite plates, and the sub-composite plates are straightened.

[0033] The total composite plate that does not meet the quality requirements is torn into two sub-composite plates, and the sub-composite plates are heated, controlled cooled and temperature measured. If the sub-composite plate reaches the cooling temperature standard, the sub-composite plate is straightened.

[0034] In order to prevent the arched four-layer composite plate from damaging the quenching water cooling equipment during controlled cooling, the existing process divides the total composite plate into carbon steel and stainless steel double-layer composite plate in advance before quenching heat treatment. After quenching heat treatment is completed, the deformation of the double-layer composite plate during cooling is within a controllable range, and the impact on the cooling equipment is small.

[0035] The production method has the following disadvantages: 1. The sub-composite plate is torn in advance, the stainless steel layer is exposed in advance, and quality defects such as scratches and indentations are easily generated during hoisting, causing the composite plate to be scrapped; 2. The carbon steel connecting plate needs to be welded after tearing, and the connecting plate will fall off during heat treatment if the welding is not firm, damaging the heat treatment equipment and requiring high technical requirements; 3. The double-layer composite plate needs to be arranged with the carbon steel plate upward during shot blasting, so the double-layer composite plate needs to be turned in advance. Scratches may occur on the double-layer composite plate during the turning process, resulting in scrapping; 4. Special control of the shot blasting machine is required during the shot blasting process, which affects the normal operation of the equipment; 5. The connecting plate needs to be cut after heat treatment, which affects the yield of the double-layer composite plate.

[0036] Chinese patent (application number 201510322936.0) discloses "a heat treatment production method of composite plate", a heat treatment production method of composite plate, belongs to heat treatment technical field. 5) After the composite plate is discharged, the composite plate is water-cooled by using the quenching machine; the quenching machine pressure is 0.3-0.5MPa, the upper header total water volume is 200-2000㎡ / h, the lower header total water volume is 800-3000㎡ / h, and the roller speed is 20-40m / min. 6) After the composite plate is water-cooled, the re-red temperature of the composite plate coating is set to 280-420℃, and the re-red temperature of the composite plate base layer.

[0037] The process steps include: welding connecting plate, grinding weld and weld point, shot blasting treatment, heating in heat treatment furnace, water cooling, re-red, cooling and cutting off connecting plate and other process stages. This method needs to tear the steel plate in advance, weld the connecting plate, the production process is complex, and the surface quality of the composite plate is greatly affected.

[0038] Chinese patent (application number 2021100666332) discloses "a heat treatment process of duplex stainless steel composite plate", the invention discloses a heat treatment process of duplex stainless steel composite plate, which comprises the following steps: (1) heating the heat treatment furnace to 500-600℃; (2) feeding the composite plate and timing, the holding time is 2-4min / mm; (3) when the holding time is over, directly take out the composite plate for air cooling, or cool it according to the carbon steel heat treatment requirement.

[0039] This process belongs to tempering and annealing heat treatment process, and the strength performance of the steel plate is limited to improve.

[0040] Chinese patent (application number 201110449633.7) discloses "a composite plate for water conservancy project and its preparation method", the invention discloses a composite plate for water conservancy project and its preparation method, the preparation method of the composite plate comprises the following steps: first, treating the surface of the carbon steel base plate and the composite plate; then, explosion welding the treated carbon steel base plate and the composite plate; supplementally welding the composite plate after explosion welding; and air cooling the composite plate after supplementally welding. The shear strength of the obtained composite plate is 280-330MPa, and the surface hardness is 275-285N / mm2". In this invention, the heat treatment temperature is 900-930℃, preferably 910℃; the holding time of heat treatment is 15-20min, preferably 18min; and air cooling is carried out after heat treatment.

[0041] This process is air-cooled after discharge, and the cooling speed is slow, especially for thick plates with a thickness of more than 40mm, the cooling effect is not obvious, which cannot effectively promote grain refinement and improve the performance of the carbon steel base plate.

[0042] In summary, the prior art lacks an efficient composite plate production process. The composite plate production method provided by the embodiments of the present application does not need to tear the total composite plate in advance, does not need to weld the connecting plate, and directly performs shot blasting treatment on the surfaces of the two carbon steel layers of the total composite plate. After normalizing in the furnace, the total composite plate is divided into two categories according to whether the quality requirements are met to perform corresponding cooling treatment, thereby eliminating the defects such as scratches and pressure pits that are prone to occur in the stainless steel part due to the early tearing of the total composite plate; avoiding the damage to the equipment caused by the falling of the welded connecting plate during the production process; and avoiding the damage to the water cooling equipment caused by the severe deformation and bulging of the composite plate during the controlled cooling process.

[0043] As an optional implementation, the shot blasting treatment comprises: performing shot blasting treatment on the surface of the carbon steel layer of the total composite plate. After the shot blasting treatment, further comprising: if the carbon steel layer of the four-layer composite plate has surface quality defects or weld quality defects, then repairing. Specifically, after the shot blasting treatment, the surface quality of one carbon steel layer is checked, the total composite plate is flipped, the surface quality of the second carbon steel layer is checked, and if surface quality defects are found, corresponding shot blasting or grinding treatment is performed until the surface quality defects of the carbon steel layer are eliminated. After the shot blasting treatment, the weld quality around the total composite plate is checked, and if weld quality defects are found, the weld is repaired until the weld defects are eliminated.

[0044] Specifically, if the total composite plate has no surface quality defects or weld quality defects, heating is performed. The total composite plate does not need to be torn before heating, the mother plate (i.e. the total composite plate) directly enters the shot blasting machine for shot blasting, the shot blasting speed is 4 meters / minute, and after shot blasting, the surface and edge welds are checked. The specific production process is: the gantry crane loads, checks the quality of one carbon steel layer and the weld around the mother plate after shot blasting by the shot blasting machine, then flips to check the quality of the second carbon steel layer, and after no quality problems are found, enters the heat treatment furnace for production.

[0045] Specifically, the quality requirements are: the total composite plate has no cracking or bulging, and after heating, the total composite plate is checked, the checking includes: checking whether the total composite plate has cracking or bulging; if there is no cracking or bulging, it is determined that the total composite plate meets the quality requirements; if there is cracking or bulging, it is determined that the total composite plate does not meet the quality requirements. The total composite plate in the heating furnace is checked for cracking or bulging, and the total composite plate with cracking or bulging is torn in advance to avoid the four-layer composite plate with cracking or bulging from directly cooling and deforming too much to damage the water cooling equipment.

[0046] Optionally, the heating comprises: the total composite plate or the sub-composite plate enters the heat treatment furnace along the flow water production line and is heated to 800℃~900℃, and is kept for 10~30 minutes. The composite plate has a wide range of applications, and the more severe the working conditions, the higher the performance requirements for the composite plate, especially the performance requirements for the carbon steel substrate.

[0047] Generally, the carbon steel base plate after rolling has large performance deviation, uneven structure and internal stress problems, and needs normalizing treatment to refine grains, uniform structure and eliminate rolling internal stress. However, it is worth noting that normalizing can improve the toughness of the carbon steel base plate, but often reduces its strength, and the yield strength and tensile strength are generally reduced by 20-50 MPa. Therefore, the generally thick normalizing steel plate is immediately controlled cooling after being discharged to control the phase change temperature, so as to obtain the required low-carbon bainite structure, and to inhibit the growth of micro-alloying element carbonitride, so as to improve the strength of the carbon steel base plate. In the technical scheme of the present application, the total composite plate which has no cracking or bulging is directly cooled after being heated, so as to greatly improve the strength of the carbon steel base plate and improve the production efficiency.

[0048] As an optional embodiment, the controlled cooling includes that the total composite plate or the sub-composite plate enters the water cooling system of the quenching machine along the flow production line. The frame height of the quenching machine is generally 500 mm, the composite plate enters the quenching machine for uncontrolled cooling, the total length of the quenching machine can reach 23.6 meters, 20 flow control zones can be arranged, the first to the fourteenth zones are high pressure zones, the fifteenth to the twentieth zones are low pressure zones, and the nozzle forms are all spray pipes.

[0049] The composite plate cooling is mainly carried out in the low pressure zones, and therefore, the low pressure zones of the fifteenth to the twentieth zones are specifically the first flow control zone, the second flow control zone, the third flow control zone, the fourth flow control zone, the fifth flow control zone and the sixth flow control zone arranged along the flow production line in sequence; the water amount of the first flow control zone is set to 400-600 m 3 / h, the water amount of the second flow control zone is set to 800-1200 m 3 / h, the water amount of the third flow control zone is set to 400-600 m 3 / h, the water amount of the fourth flow control zone is set to 800-1200 m 3 / h, the water amount of the fifth flow control zone is set to 400-600 m 3 / h, and the water amount of the sixth flow control zone is set to 800-1200 m 3 / h.

[0050] As an optional embodiment, the ratio of the lower header flow rate to the upper header flow rate of the water cooling system is 1.5-2.2, and the conveying roller speed of the flow production line is selected to be 15-20 m / min.

[0051] As an optional embodiment, after the controlled cooling, the cooling temperature standard is that the temperature is reduced to 600-650 DEG C. The composite plate will have a red heat after the controlled cooling, and the temperature thereof can be detected by a pyrometer. This is a conventional operation, and is not limited here.

[0052] The following will be described in combination with examples and Figure 2, 3 The technical solutions of the embodiments of the present invention are described in detail.

[0053] Taking the composite plate for a hot blast stove made of 904L stainless steel and Q345R carbon steel as an example, the specifications of the base plates for the three types of composite plates are as follows:

[0054] 81mm*2085mm*19543mm, 904L stainless steel layer thickness 5mm, Q345R thickness 20.5mm.

[0055] 91mm*3432mm*8343mm, 904L stainless steel layer thickness 5mm, Q345R thickness 40.5mm.

[0056] 110mm*2527mm*8467mm, 5mm thick 904L stainless steel layer, 50mm thick Q345R.

[0057] Production process such as Figure 2 As shown, Figure 2 This is a flowchart of the composite board production process in an embodiment of the present invention; Figure 3 The production line shown is used for production. First, the gantry crane 1 loads the material, and after shot blasting by the shot blasting machine 2, the surface quality of the upper carbon steel plate and the weld seams around the mother plate are checked. Then, the flipping machine 3 flips the plate to check the surface quality of the lower carbon steel plate of the composite plate. If there are no quality problems, it is put into the heat treatment furnace 4 for heating.

[0058] The heat treatment furnace 4 is heated to 880℃ and held for 20 minutes. The furnace door is opened to check the head of the composite plate for bulges or cracks. Composite plates without bulges or cracks are directly transferred to the quenching machine 5 for controlled cooling. Plates with bulges or cracks are removed from the furnace, torn into double-layered sub-composite plates, and then returned to the heat treatment furnace 4 for reheating at 880℃ for 20 minutes, before being transferred to the quenching machine 5 for controlled cooling.

[0059] The upper frame of the quenching machine 5 is set to 500mm, with a total length of 23.6 meters. It has 20 flow control zones: zones 1-14 are high-pressure zones, and zones 15-20 are low-pressure zones. Zones 15-20 are used for controlled cooling. During controlled cooling, the water flow rate in zone 15 is set to 500m³. 3 / h, the water volume in Zone 16 is set at 1100m³. 3 / h, the water volume in Zone 17 is set at 500m³. 3 / h, the water volume in Zone 18 is set at 1100m³. 3 / h, the water volume in Zone 19 is set at 500m³. 3 / h, the water volume in Zone 20 is set at 1100m³. 3 The quenching machine has a 5-roll speed of 15 m / min, achieving direct cooling.

[0060] After the quenching machine 5, the pyrometer 6 detects that the total composite plate or the sub-composite plate is less than 630℃, the total composite plate is torn into a sub-composite plate, and the sub-composite plate enters the straightening machine 7.

[0061] Taking the composite plate for a container composed of SA-240 304L stainless steel and 516 Gr.70N carbon steel as an example, the specifications of the three total composite plates are respectively:

[0062] 35mm*1750mm*10850mm, the thickness of the 304L stainless steel layer is 3mm, and the thickness of the 516 Gr.70N is 14.5mm.

[0063] 57mm*1950mm*89500mm, the thickness of the 304L stainless steel layer is 3mm, and the thickness of the 516 Gr.70N is 25.5mm.

[0064] 65mm*800mm*10850mm, the thickness of the 304L stainless steel layer is 5mm, and the thickness of the 516 Gr.70N is 27.5mm.

[0065] The production process is as shown in Figure 2 The production line shown in Figure 3 is used for production. First, the gantry crane 1 is loaded, the shot blasting machine 2 is inspected after shot blasting, the surface quality of the upper carbon steel plate and the weld around the base plate are inspected, then the plate turnover machine 3 is used to inspect the surface quality of the lower carbon steel plate of the composite plate, and then the hot treatment furnace 4 is used for heating after no quality problem.

[0066] The heating temperature of the hot treatment furnace 4 is 880℃, and the holding time is 10 minutes. The hot treatment furnace door is opened to check whether there is a bulge or crack at the head of the total composite plate. The total composite plate without bulge or crack directly enters the quenching machine 5 for controlled cooling. If there is a bulge or crack, it is directly discharged from the furnace, torn into a double-layer sub-composite plate, heated in the hot treatment furnace 4 again, and then enters the quenching machine 5 for controlled cooling.

[0067] The upper frame of the quenching machine 5 is set to 500mm, the total length is 23.6m, there are 20 flow control zones, the first-14th zone is a high-pressure zone, and the 15th-20th zone is a low-pressure zone. The 15th-20th zone is used for controlled cooling. During controlled cooling, the water flow of the 15th zone is set to 400m 3 / h, the water flow of the 16th zone is set to 900m 3 / h, the water flow of the 17th zone is set to 400m 3 / h, the water flow of the 18th zone is set to 900m 3 / h, the water flow of the 19th zone is set to 400m 3 / h, the water flow of the 20th zone is set to 900m 3 / h, and the roller speed of the quenching machine 5 is 20m / min, realizing straight-through cooling.

[0068] After the quenching machine 5, the pyrometer 6 detects that the re-red temperature of the total composite plate or the sub composite plate is less than 650 DEG C, the total composite plate is torn into the sub composite plate, and the sub composite plate enters the straightening machine 7 for straightening.

[0069] The technical scheme provided in the embodiment of the present application has at least the following technical effects or advantages:

[0070] The composite plate production method provided in the embodiment of the present application screens out the total composite plate with defects before controlled cooling, and after being torn into the double-layer sub composite plate, the total composite plate with defects is executed quenching, temperature measurement and straightening; the total composite plate without defects is directly executed controlled cooling, temperature measurement, and then torn into the double-layer sub composite plate and straightened. The method avoids the defects of the existing technology, such as the scratch and the pressure pit of the stainless steel layer caused by tearing the total composite plate into the sub composite plate and then executing the shot blasting, avoids the harm of the falling-off of the welding connecting plate to the equipment in the production process, and avoids the defect of the damage of the water cooling equipment caused by the severe deformation and bulging of the total composite plate with defects during the direct controlled cooling.

[0071] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present specification.

[0072] Similarly, it is to be understood that, in the above description of exemplary embodiments of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description of a related aspect. This method of disclosure, however, is not to be interpreted as reflecting an intention that the application requires more features than are explicitly recited in each claim. Rather, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following, in this application are hereby expressly incorporated into this detailed description, with each claim acting as a separate embodiment of the application. Thus the claims are to be understood to include what is specifically shown and described and what is understood by those skilled in the art to be equivalent to what is specifically shown and described.

[0073] It should be noted that the above-mentioned embodiments illustrate the application rather than limit the application, and alternative embodiments can be designed by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word comprising does not exclude the presence of elements or steps not listed in the claim. The word a or an preceding an element does not exclude the presence of a plurality of such elements. In a unit claim, the use of the terms first, second and third, etc. does not preclude the presence of, e.g., third such elements; such terms are merely used to distinguish between two or more elements or steps.

Claims

1. A method of producing a composite board, characterized by, The composite plate is a double-layer plate composed of a carbon steel layer and a stainless steel layer; the composite plate production method comprises the following steps: The total composite plate is subjected to shot blasting treatment and heating; the total composite plate is a four-layer composite plate composed of two composite plates through the stainless steel layer; The total composite plate meeting the quality requirement is subjected to controlled cooling and temperature measurement; if the total composite plate reaches the cooling temperature standard, the total composite plate is torn into two composite plates, and the composite plates are straightened; the quality requirement is that the total composite plate has no cracking or bulging; the cooling temperature standard is that the temperature is reduced to 600-650 DEG C; The total composite plate not meeting the quality requirement is torn into two composite plates, and the composite plates are subjected to heating, controlled cooling and temperature measurement; if the composite plates reach the cooling temperature standard, the composite plates are straightened; the heating comprises that the total composite plate or the composite plate is heated to 800-900 DEG C in a heat treatment furnace along with a flow water production line, and is kept for 10-30 minutes.

2. The composite sheet production method according to claim 1, wherein The shot blasting treatment comprises that the surface of the carbon steel layer of the total composite plate is subjected to shot blasting treatment.

3. The composite sheet production method according to claim 2, wherein After the shot blasting treatment, if the carbon steel layer of the four-layer composite plate has surface quality defects or weld quality defects, the four-layer composite plate is repaired.

4. The composite sheet production method according to claim 3, wherein The repair comprises shot blasting treatment, grinding and repair welding.

5. The composite sheet production method according to claim 1, wherein The controlled cooling comprises that the total composite plate or the composite plate is cooled in a water cooling system of a quenching machine along with a flow water production line.

6. The composite sheet production method according to claim 5, wherein The water cooling system comprises a first flow control area, a second flow control area, a third flow control area, a fourth flow control area, a fifth flow control area and a sixth flow control area arranged in sequence along the water flow production line. 3 The water quantity of the first flow control area is set to 400-600 m 3 / h, the water quantity of the second flow control area is set to 800-1200 m 3 / h, the water quantity of the third flow control area is set to 400-600 m 3 / h, the water quantity of the fourth flow control area is set to 800-1200 m 3 / h, the water quantity of the fifth flow control area is set to 400-600 m 3 / h, and the water quantity of the sixth flow control area is set to 800-1200 m / h.

7. The composite sheet production method according to claim 5, wherein The ratio of the flow rate of the lower header of the water cooling system to the flow rate of the upper header is 1.5-2.2.

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