Titanium-steel clad plate and method of manufacturing the same

Abstract

The present application belongs to the technical field of metal layered composite material preparation, and relates to a titanium-steel composite plate and a manufacturing method thereof. The manufacturing method comprises the following steps: removing the surface oxide layer of a steel coil through shot blasting treatment, and making the surface of the treated steel coil have a specified surface roughness; coating an intermediate plating layer on the surface of the steel coil; making the rolling bonding surface of a titanium coil and the steel coil have a specified surface roughness through shot blasting treatment; preheating the steel coil and the titanium coil; performing first composite rolling on the preheated steel coil and titanium coil; heating the composite coil after the first composite rolling to a specified temperature and keeping the temperature; performing second composite rolling on the composite coil after heating and keeping the temperature; performing martensite quenching or bainite quenching by controlling the cooling speed and temperature of the composite coil after the second composite rolling; performing flattening and / or straightening treatment on the composite coil; performing tempering treatment on the flattened and / or straightened composite coil; and coiling or slitting the composite coil after the tempering treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal layered composite material preparation, and relates to a titanium-steel composite plate and a manufacturing method thereof. BACKGROUND

[0002] The titanium-steel composite plate is a high-efficiency energy-saving composite material with steel as a base body and single-sided or double-sided titanium cladding. The titanium-steel composite plate can fully exert the advantages of the two materials, has the corrosion resistance of titanium, and has the strength and plasticity of steel as a structural member, thereby prolonging the service life of the material and reducing the cost. The titanium-steel composite plate has been widely used in the fields of chemical industry, electric power, machinery and ocean engineering due to its excellent comprehensive performance, and the demand is increasing. At present, the manufacturing methods of the titanium-steel composite plate mainly include explosion compounding, hot rolling compounding, explosion + rolling compounding and diffusion compounding.

[0003] The explosion compounding method is a welding method for realizing the close connection of the composite interface by using the mechanical energy and internal energy generated by the explosion of explosives to cause high-speed collision of double-layer or multi-layer metal composite plates at a high temperature in an instant. The composite plate manufactured by the explosion compounding method has high bonding strength and excellent reprocessing performance. However, the explosion compounding method has low mechanization degree, poor labor conditions, low production efficiency, and defects such as uneven interface bonding strength of the composite plate, and the noise, vibration and pollution generated during explosion cause damage to the surrounding environment.

[0004] The hot rolling compounding method is to heat the plate blank at a high temperature, and then apply a great pressure to the rolling piece by the roller to make the composite interface contact place continuously produce plastic deformation under the action of high temperature and high pressure, and the mutual diffusion of the base material atoms and the composite material atoms, so as to realize the compounding of the plate. The current hot rolling compounding method has the following technical problems: 1) In order to avoid the warping of the composite plate caused by the deformation incoordination of titanium and steel, the symmetric rolling method is usually adopted, and the plate blank is assembled in the order of steel plate → titanium plate → isolation agent → steel plate, or steel plate → titanium plate → isolation agent → titanium plate → steel plate, and then separated after rolling, which causes complex process; 2) In order to avoid the oxidation of the titanium-steel interface at a high temperature, the titanium-steel blank is assembled by the small hole vacuum method or the vacuum electron beam welding method to realize the vacuum of the titanium-steel interface, and then hot rolled, which causes a complex process and high equipment cost; 3) During heating and rolling of the hot rolling compounding method, the titanium-steel blank directly contacts, and the heating and rolling temperature needs to be strictly controlled to avoid the generation of brittle phases such as TiC, FeTi and Fe2Ti at the interface, thereby reducing the interface bonding strength; 4) The current process does not consider adjusting the cooling path during the hot rolling cooling process, and the mechanical properties of the base layer are improved by controlling the organization of the steel plate; 5) The heating process (plate blank heating temperature and time) of the composite rolling plate blank is different from that of the carbon steel hot rolling plate blank, and the use of the existing hot rolling line to produce the composite plate will affect the production rhythm of the current unit. SUMMARY

[0005] Therefore, the present application aims to provide a titanium-steel composite plate manufacturing method to solve the problems of complex process equipment, low production efficiency and poor product quality.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0007] A titanium-steel composite plate manufacturing method, comprising the following steps:

[0008] Raw material coil pretreatment: removing the oxide layer on the surface of the steel coil by shot blasting treatment, and making the surface of the treated steel coil have a specified surface roughness, then coating an intermediate layer on the surface of the steel coil, and making the rolling bonding surface of the titanium coil and the steel coil have a specified surface roughness by shot blasting treatment;

[0009] First composite rolling: preheating the steel coil and the titanium coil, and then performing first composite rolling on the preheated steel coil and titanium coil to obtain a composite coil;

[0010] Composite coil heating: heating the composite coil after the first composite rolling to a specified temperature and maintaining the temperature;

[0011] Second composite rolling: performing second composite rolling on the composite coil after heating and maintaining the temperature;

[0012] Composite coil controlled cooling: after the second composite rolling is completed, performing martensitic quenching or bainitic quenching by controlling the cooling speed and temperature of the composite coil;

[0013] Leveling / straightening: performing leveling and / or straightening treatment on the composite coil;

[0014] Composite coil tempering: performing tempering treatment on the leveled and / or straightened composite coil;

[0015] Composite coil coiling / cutting: coiling or cutting the tempered composite coil.

[0016] Further, in the raw material coil pretreatment step, the steel coil is a hot-rolled steel coil, the material of the steel coil is carbon steel, and the thickness specification is 0.5mm-8mm;

[0017] And / or, the titanium coil is a pickled coil or a cold-rolled coil, the material of the titanium coil is pure titanium or titanium alloy, and the thickness specification is 0.1mm-8mm;

[0018] And / or, the shot blasting treatment is dry shot blasting or wet shot blasting, and the wet shot blasting uses a shot blasting device to project mortar to the surface of the steel / titanium coil;

[0019] And / or, the coating method of the intermediate coating layer is one of hot-dip coating, electroplating, PVD, CVD or thermal spraying, the material of the intermediate coating layer is one or more of niobium, molybdenum, nickel, silver, copper, vanadium or aluminum, the intermediate coating layer covers one side of the steel coil rolling joint surface or both sides of the steel coil, and the thickness of the intermediate coating layer is 0.001mm-2mm;

[0020] And / or, the surface roughness of the steel coil after the shot blasting treatment is Ra 1.0μm-50μm.

[0021] And / or, the surface roughness of the titanium coil after the shot blasting treatment is Ra 1.0μm-50μm.

[0022] Further, the mortar in the wet shot blasting is a mixture of abrasive and water, and the abrasive is steel shot or steel sand, and the material is carbon steel or stainless steel.

[0023] Further, in the first composite rolling step, the preheating temperature of the steel coil is 100℃-700℃, and the preheating temperature of the titanium coil is 100℃-700℃.

[0024] And / or, the total reduction rate of the first composite rolling is 20%-80%, the total rolling pass is 1 pass-6 passes, and the reduction rate of the first pass is greater than 20%.

[0025] Further, in the composite coil heating step, the heating speed of the composite coil is 1℃ / s-50℃ / s.

[0026] And / or, the holding temperature of the composite coil is a certain temperature between the austenite start transformation temperature and the austenite finish transformation temperature (Ac1-Ac3) of the steel coil, and the holding time is 10s-1200s, or the holding temperature of the composite coil is a certain temperature between the austenite finish transformation temperature and the austenite finish transformation temperature 150℃ above (Ac3-Ac3+150℃) of the steel coil, and the holding time is 10s-1200s.

[0027] Further, in the second composite rolling step, the total reduction rate of the second composite rolling is 5%-80%, and the rolling temperature is the holding temperature in the composite coil heating step.

[0028] Further, in the composite coil controlled cooling step, the cooling speed of the composite coil adopting martensite quenching is greater than the critical cooling speed of martensite transformation, and the cooling end temperature of the composite coil is lower than the end temperature of martensite transformation (Mf);

[0029] The cooling speed of the composite coil adopting bainite quenching is greater than the critical cooling speed of pearlite transformation, and the cooling end temperature of the composite coil is a certain temperature in the bainite transformation temperature range.

[0030] Further, in the flattening and / or straightening step, the flattening reduction of the flattening process is 0.01% to 8%, and the treatment mode of the straightening process is roll straightening.

[0031] Further, in the tempering step, the tempering heating rate is 1℃ / s to 200℃ / s, the tempering temperature is 150℃ to 700℃, and the tempering time is 10s to 1200s.

[0032] In another aspect, the application also provides a titanium steel composite plate prepared by the titanium steel composite plate manufacturing method.

[0033] The application has the following advantages:

[0034] The titanium steel composite plate manufacturing method provided by the application can remove the surface oxide layer of the plate strip and adjust the roughness of the rolling bonding surface through the shot blasting treatment, and the bonding surface has a uniform roughness distribution, which is beneficial to improving the uniformity of the product performance, and the intermediate coating layer is prepared on the surface of the steel coil through plating, which can prevent the surface oxidation of the hot-rolled composite rolling steel coil during heating, and isolate the contact surface of the steel and titanium to avoid the generation of brittle phase during the hot rolling process and reduce the interface strength.

[0035] Secondly, the first composite rolling, the composite coil heating, the second composite rolling, the composite coil controlled cooling, the flattening / straightening and the composite coil tempering in the manufacturing method are all continuous production of the coil material, which can greatly improve the production efficiency, and the composite rolling process of the coil material does not need to consider the warping problem of the composite plate caused by the deformation incoordination of titanium and steel, and the rolling can be directly realized.

[0036] Finally, the manufacturing method controls the steel coil organization through martensite quenching and bainite quenching during the controlled cooling process of the hot-rolled composite rolling, and realizes the material "lightweight" by improving the strength of the steel base plate.

[0037] Other advantages, objects, and features of the application will be apparent from the following specification, and in some aspects, from the examination of the following specification in conjunction with the accompanying drawings, the significance of combination of which will become apparent to those skilled in the art. The objectives and other advantages of the application will be realized and attained by the embodiments particularly pointed out in the written description and claims hereof. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to make the purposes, technical solutions and advantages of the application more clear, the preferred detailed description of the application will be combined with the drawings as follows, in which:

[0039] Figure 1 The figure is a process path schematic diagram of the titanium steel composite plate manufacturing method in the application;

[0040] Figure 2 A schematic diagram of the process flow for the first time composite rolling of steel / titanium coil;

[0041] Figure 3 A schematic diagram of the process path for the third stage to the seventh stage in Example 1;

[0042] Figure 4 A schematic diagram of the process path for the third stage to the seventh stage in Example 5;

[0043] Figure 5 A schematic diagram of the process path for the third stage to the seventh stage in Example 3;

[0044] Figure 6 A schematic diagram of the process path for the third stage to the seventh stage in Example 4.

[0045] Reference numerals: 1 - composite coil heating section, 2 - second time rolling composite section, 3 - composite coil controlled cooling section, 4 - leveling or straightening section, 5 - composite coil tempering section. DETAILED DESCRIPTION

[0046] The present application is described below by way of specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure herein. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details herein based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the features in the following examples and embodiments can be combined with each other without conflict.

[0047] The drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and should not be understood as a limitation on the present application. In order to better illustrate the embodiments of the present application, some components of the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0048] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0049] Please refer to Figures 1-6 , a manufacturing method of a titanium-steel composite plate, the manufacturing method process flow is: raw material coil pretreatment→first composite rolling→composite coil heating→second composite rolling→composite coil controlled cooling→leveling / straightening→composite coil tempering→composite coil winding / cutting.

[0050] Embodiment 1

[0051] Please refer to Figures 2-3 , the following will be further described with 5mm specification DP780 hot-rolled coil (steel coil) and 1mm specification TA1 pure titanium coil as an example, the manufacturing process of the titanium-steel composite plate in the present application is divided into the following eight stages:

[0052] The first stage (raw material coil pretreatment): the DP780 hot-rolled coil is treated by wet shot blasting (abrasive is steel sand) to remove scale, the surface roughness of the steel plate after treatment is Ra4.5μm, and an aluminum coating with a thickness of 5μm is prepared on both sides of the DP780 hot-rolled coil by hot dipping after the scale removal treatment; the TA1 pure titanium hot-rolled coil is treated by wet shot blasting (abrasive is steel sand) to remove scale, the surface roughness of the titanium plate after treatment is Ra4.5μm.

[0053] The second stage (first composite rolling): the pretreated DP780 steel coil and TA1 pure titanium coil are preheated to 350℃ and 200℃ respectively, then the preheated steel coil and titanium coil are stacked together for first composite rolling, rolling 1 pass, reduction rate is 40%. The steel coil and titanium coil preheating and first composite rolling process is shown in Figure 2 .

[0054] The third to seventh stages (composite coil heating→second composite rolling→composite coil controlled cooling→leveling→composite coil tempering) process path is shown in the attached Figure 3 , which is in turn the temperature and time parameter control of the composite coil heating section 1, the second rolling composite section 2, the composite coil controlled cooling section 3, the leveling or straightening section 4 and the composite coil tempering section 5, the process parameter setting scheme of each stage is as follows:

[0055] Third stage (composite coil heating) : the composite coil after the first composite rolling is heated to 910℃ at a speed of 10℃ / s, and is kept at 910℃ for 600s;

[0056] Fourth stage (second composite rolling) : the composite coil after the heat preservation treatment is subjected to the second composite rolling, and is rolled for 1 pass with a reduction of 30%;

[0057] Fifth stage (composite coil controlled cooling) : the composite coil after the second composite rolling is quenched to 450℃ (bainite transformation zone) at a speed of 60℃ / s, and is kept isothermal;

[0058] Sixth stage (tempering) : the composite coil is subjected to the tempering treatment, and the tempering reduction is 4%, and the flatness of the composite coil after the tempering treatment is controlled to be 5mm / m;

[0059] Seventh stage (composite coil tempering) : the composite coil after the tempering treatment is heated to 550℃ at a speed of 10℃ / s, and is kept at 550℃ for 600s.

[0060] Eighth stage (composite coil coiling) : after the tempering treatment of the composite coil is completed, the coiling is carried out.

[0061] The titanium-steel composite plate produced by the above method has a shear strength of 230MPa, the steel base plate has a bainite and martensite structure, and the tensile strength is 820MPa.

[0062] Example 2

[0063] Key reference Figure 4 , the following will further describe the manufacturing method of the titanium-steel composite plate in the present application by taking the 5mm specification DP780 hot-rolled coil (steel coil) and the 1mm specification TA1 pure titanium coil as examples, and the manufacturing process is divided into the following eight stages:

[0064] First stage : the DP780 hot-rolled coil is subjected to the descaling treatment by the wet-type shot blasting (the abrasive is steel sand), the surface roughness of the steel plate after the treatment is Ra4.5μm, and the nickel plating layer with a thickness of 3μm is prepared on both sides of the DP780 hot-rolled coil by electroplating after the descaling treatment; the TA1 hot-rolled coil is subjected to the descaling treatment by the wet-type shot blasting (the abrasive is steel sand), and the surface roughness of the titanium plate after the treatment is Ra4.5μm.

[0065] Second stage : the DP780 steel coil and the TA1 titanium coil are preheated to 350℃ and 200℃ respectively, and then the preheated steel coil and titanium coil are stacked together for the first composite rolling, and are rolled for 2 passes with a total reduction of 50%, wherein the reduction of the first pass is 30%.

[0066] The process paths of the third to seventh stages are shown in the attached Figure 4The temperature and time parameter control of the shown composite coil heating section 1, the second rolling composite section 2, the composite coil controlled cooling section 3, the flattening or straightening section 4 and the composite coil tempering section 5 are in turn as follows:

[0067] The third stage: the composite coil after the first composite rolling is heated to 850℃ at a speed of 10℃ / s, and is kept at 850℃ for 720s;

[0068] The fourth stage: the composite coil after the heat preservation is subjected to the second composite rolling, and is rolled for one pass with a reduction of 30%;

[0069] The fifth stage: the composite coil after the second composite rolling is quenched to 450℃ (the bainite transformation zone) at a speed of 60℃ / s for isothermal;

[0070] The sixth stage: the composite coil is subjected to the flattening rolling treatment, and the flattening reduction is 4%, and the flatness of the composite coil after the flattening treatment is controlled to be 5mm / m;

[0071] The seventh stage: the composite coil after the flattening treatment is heated to 550℃ at a speed of 10℃ / s, and is kept at 550℃ for 600s.

[0072] The eighth stage: after the tempering treatment of the composite coil, the coiling is performed.

[0073] The titanium-steel composite plate produced by the above method has a shear strength of 230MPa, the steel base plate has a structure of ferrite, bainite and martensite, and a tensile strength of 800MPa.

[0074] Example 3

[0075] Key reference Figure 5 The titanium-steel composite plate manufacturing method in the present application is further described below by taking a 4mm specification DP590 hot-rolled coil (steel coil) and a 1mm specification TA1 pure titanium coil as examples, and the manufacturing process is divided into the following eight stages:

[0076] The first stage: the DP590 hot-rolled coil is subjected to the descaling treatment by the wet-type shot blasting (the abrasive is steel sand), and the surface roughness of the steel plate after the treatment is Ra5μm, and the aluminum plating layer with a thickness of 20μm is prepared on the composite rolling joint side of the DP590 hot-rolled coil by the thermal spraying after the descaling treatment; the TA1 hot-rolled coil is subjected to the descaling treatment by the wet-type shot blasting (the abrasive is steel sand), and the surface roughness of the steel plate after the treatment is Ra4.5μm.

[0077] The second stage: the DP590 steel coil and the TA1 titanium coil are preheated to 300℃ and 200℃ respectively, and then the preheated steel coil and titanium coil are stacked together for the first composite rolling, and are rolled for one pass with a total reduction of 40%.

[0078] The third stage to the seventh stage process path is shown in Fig. 1, which is sequentially the temperature and time parameter control of the composite coil heating section 1, the second rolling composite section 2, the composite coil controlled cooling section 3, the flattening or straightening section 4 and the composite coil tempering section 5. The process parameter setting scheme of each stage is as follows: Figure 5

[0079] The third stage: the composite coil after the first composite rolling is heated to 910℃ at a speed of 10℃ / s, and is kept at 910℃ for 600s;

[0080] The fourth stage: the composite coil after the heat preservation is subjected to the second composite rolling, and is rolled for one pass with a reduction of 25%;

[0081] The fifth stage: the composite coil after the second composite rolling is quenched to 100℃ isothermally (martensite quenching) at a speed of 60℃ / s;

[0082] The sixth stage (straightening): the composite coil is subjected to the roll straightening treatment, and the flatness of the composite coil after the straightening treatment is 4mm / m;

[0083] The seventh stage: the composite coil after the straightening treatment is heated to 500℃ at a speed of 10℃ / s, and is kept at 500℃ for 720s.

[0084] The eighth stage (cutting of the composite coil): after the tempering treatment of the composite plate, the plate is cut.

[0085] The titanium-steel composite plate produced by the above method has a shear strength of 220MPa, the steel base plate has a structure of tempered sorbite, and the tensile strength is 600MPa.

[0086] Example 4

[0087] For reference Figure 6 , the titanium-steel composite plate manufacturing method in the present application is further described below by taking the 4mm specification DP590 hot-rolled coil (steel coil) and the 1mm specification TA1 pure titanium coil as examples. The manufacturing process is divided into the following eight stages:

[0088] The first stage: the DP590 hot-rolled coil is subjected to the descaling treatment by wet shot blasting (the abrasive is steel sand), and the surface roughness of the steel plate after the treatment is Ra5μm. The aluminum coating layer with a thickness of 10μm is prepared on the surface of the DP590 hot-rolled coil by hot dipping after the descaling treatment. The TA1 hot-rolled coil is subjected to the descaling treatment by wet shot blasting (the abrasive is steel sand), and the surface roughness of the steel plate after the treatment is Ra4.5μm.

[0089] The second stage: the DP590 steel coil and the TA1 titanium coil are preheated to 300℃ and 200℃ respectively, and then the preheated steel coil and titanium coil are stacked together for the first composite rolling, which is rolled for two passes with a total reduction of 50%, and the reduction of the first pass is 30%.​

[0090] The process pathways for stages three through seven are attached. Figure 6 As shown, the temperature and time parameters for the composite coil heating section 1, the second rolling composite section 2, the composite coil controlled cooling section 3, the leveling or straightening section 4, and the composite coil tempering section 5 are controlled sequentially. The process parameter setting schemes for each stage are as follows:

[0091] Third stage: After the first composite rolling, the composite roll is heated to 850℃ at a rate of 10℃ / s and held at 850℃ for 720s.

[0092] Fourth stage: The composite roll after heat preservation treatment is subjected to a second composite rolling process, with one rolling pass and a reduction rate of 25%.

[0093] Fifth stage: The composite coil after the second composite rolling is quenched at 60℃ / s to 100℃ isothermally (martensitic quenching);

[0094] Stage 6 (Straightening): The composite roll is straightened by rollers. After straightening, the flatness of the composite board is 4mm / m.

[0095] Stage 7: The straightened composite roll is heated to 500℃ at a rate of 10℃ / s and held at 500℃ for 720s.

[0096] Eighth stage (composite roll slitting): After the composite roll has been tempered, it is cut into sheets.

[0097] The titanium-steel composite plate produced by the above method has a shear strength of 220 MPa, a steel substrate microstructure of ferrite and tempered sorbite, and a tensile strength of 590 MPa.

[0098] In another embodiment, in the seventh stage (flattening and / or straightening step), a process of flattening first and then straightening can be used to correct the shape of the composite roll.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method of manufacturing a titanium steel clad plate, characterized by, Includes the following steps: Raw material coil pretreatment: The oxide layer on the surface of the steel coil is removed by shot blasting, and the surface of the treated steel coil has a specified surface roughness. Then, an intermediate coating is applied to the surface of the steel coil, and shot blasting is performed to give the rolling interface between the titanium coil and the steel coil a specified surface roughness. First composite rolling: The steel coil and titanium coil are preheated, and then the preheated steel coil and titanium coil are subjected to the first composite rolling to obtain the composite coil; Composite roll heating: The composite roll after the first composite rolling is heated to a specified temperature and held at that temperature; Second composite rolling: The composite coil, after being heated and held at a certain temperature, undergoes a second composite rolling process; Composite roll controlled cooling: After the second composite rolling, the cooling rate and temperature of the composite roll are controlled to perform martensitic quenching or bainitic quenching. Leveling / Straightening: Leveling and / or straightening the composite roll; Composite roll tempering: Tempering the flattened and / or straightened composite roll; Composite roll winding / slitting: winding or slitting composite rolls after tempering; The intermediate coating material is one or more of niobium, molybdenum, nickel, silver, copper, vanadium or aluminum. The intermediate coating covers one side of the rolling joint surface of the steel coil or both sides of the steel coil. The thickness of the intermediate coating is 0.001mm to 2mm. In the first composite rolling step, the preheating temperature of the steel coil is 100℃~700℃, and the preheating temperature of the titanium coil is 100℃~700℃. The total reduction rate of the first composite rolling is 20% to 80%, the total number of rolling passes is 1 to 6, and the reduction rate of the first rolling pass is greater than 20%. The heat preservation temperature of the composite coil is a temperature between the austenite initiation transformation temperature and the austenite completion transformation temperature of the steel coil, and the heat preservation time is 10s~1200s; or, the heat preservation temperature of the composite coil is a temperature between the austenite completion transformation temperature of the steel coil and a temperature above 150°C of the austenite completion transformation temperature, and the heat preservation time is 10s~1200s. In the second composite rolling step, the total reduction rate of the second composite rolling is 5%~80%, and the initial rolling temperature is the holding temperature in the composite coil heating step.

2. The method of claim 1, wherein: The steel coils used in the raw material coil pretreatment step are hot-rolled steel coils, made of carbon steel, with a thickness of 0.5mm to 8mm. And / or, the titanium coil is an acid-washed coil or a cold-rolled coil, the titanium coil material is pure titanium or titanium alloy, and the thickness specification is 0.1mm~8mm; And / or, the shot blasting process is dry shot blasting or wet shot blasting, wherein the wet shot blasting uses a shot blaster to project slurry onto the surface of the steel coil / titanium coil; And / or, the intermediate coating is applied by one of the following methods: hot-dip plating, electroplating, PVD, CVD, or thermal spraying; And / or, the surface roughness of the steel coil after shot blasting is Ra1.0μm~50μm; And / or, the surface roughness of the titanium coil after shot blasting is Ra1.0μm~50μm.

3. The method for manufacturing titanium-steel composite plates according to claim 2, characterized in that: The slurry in the wet shot blasting process is a mixture of abrasive and water, and the abrasive is steel shot or steel grit made of carbon steel or stainless steel.

4. The method for manufacturing titanium-steel composite plates according to claim 1, characterized in that: In the composite roll heating step, the heating rate of the composite roll is 1℃ / s to 50℃ / s.

5. The method for manufacturing titanium-steel composite plates according to claim 1, characterized in that: In the controlled cooling step of the composite roll, the cooling rate of the composite roll quenched by martensitic quenching is greater than the critical cooling rate of martensitic transformation, and the cooling end temperature of the composite roll is lower than the martensitic transformation end temperature. The cooling rate of the composite roll quenched by bainite is greater than the critical cooling rate of pearlite transformation, and the cooling endpoint temperature of the composite roll is a certain temperature in the bainite transformation temperature range.

6. The method for manufacturing titanium-steel composite plates according to claim 1, characterized in that: In the leveling and / or straightening steps, the leveling reduction rate of the leveling process is 0.01% to 8%, and the straightening process is performed by roller straightening.

7. The method for manufacturing titanium-steel composite plates according to claim 1, characterized in that: In the composite roll tempering step, the tempering heating rate is 1℃ / s~200℃ / s, the tempering temperature is 150℃~700℃, and the tempering time is 10s~1200s.

8. A titanium-steel composite plate, characterized in that: Titanium-steel composite plate prepared by the manufacturing method of titanium-steel composite plate according to any one of claims 1-7.

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