CN111763876A - Cold-rolled steel plate for motor vehicle silencing sheet and production method thereof - Google Patents
Cold-rolled steel plate for motor vehicle silencing sheet and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
The invention discloses a cold-rolled steel plate for a motor vehicle silencing piece and a production method thereof, and mainly solves the technical problems that the existing cold-rolled steel plate for the motor vehicle silencing piece has large hardness fluctuation, low elongation and high production cost and cannot meet the preparation requirement of the motor vehicle silencing piece. The invention provides a cold-rolled steel plate for a motor vehicle silencing piece, which comprises the following chemical components in percentage by weight: c: 0.055-0.075%, Si not more than 0.02%, Mn: 0.25-0.35%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Al: 0.02-0.05%, N: 0.012-0.017% and the rest is Fe and other inevitable impurities. 0.20-0.45 mm thick cold rolled steelElongation after fracture of the plate A80mm10 to 15% of tensile strength Rm490 to 590MPa, and 155 to 200HV 1. The cold-rolled steel sheet of the invention is used for manufacturing a sound-deadening sheet for a motor vehicle.
Description
Technical Field
The invention relates to a cold-rolled steel sheet and a production method thereof, in particular to a cold-rolled steel sheet for a motor vehicle noise damping sheet and a production method thereof; in particular to a cold-rolled steel plate with 490 MPa-level tensile strength and a production method thereof, which are used for manufacturing a silencing sheet of a motor vehicle and belong to the technical field of iron-based alloy.
Background
The main function of the silencing plate of the motor vehicle is to combine with the brake plate of the motor vehicle to reduce or eliminate the noise when braking. The silencing sheet is generally coated with a rubber coating on a metal substrate, when mechanical vibration is transmitted, the rubber damping layer can deform, and due to the viscous action, the mechanical vibration energy can be converted into heat energy to be dissipated.
In order to ensure that the silencing piece is well attached to the brake pad and has high wear resistance, the key performance requirements of the steel plate for the locomotive silencing piece are high strength, good plate shape and stamping formability, and the inner wave height of the steel strip with the length of 2m is less than or equal to 3 mm.
Chinese patent application with patent publication No. CN108251752A discloses a motor vehicle silencing sheet substrate and a production method thereof, wherein the production process comprises the following steps: c: 0.08-0.13%, Mn: 0.40-0.80%, Al: 0.06-0.10% of Si, less than or equal to 0.03% of N, less than or equal to 0.005% of P, less than or equal to 0.02% of S, and the balance of Fe and other inevitable impurities. The production method comprises the working procedures of smelting, refining, continuous casting, hot rolling, acid washing, primary cold rolling, annealing, finishing and gluing. A hardness of 150 to 220HV5 and an elongation A80mm5-10%, the disadvantages are: 1. the carbon content is 0.08-0.13%, the peritectic steel belongs to peritectic steel, peritectic reaction is carried out during continuous casting to generate phase change shrinkage, so that longitudinal surface cracks and transverse corner cracks are easily generated in the casting blank solidification process, slag is easily coiled to cause steel defects, a plate blank cannot be subjected to hot charging and hot delivery, surface cleaning is required to be carried out when the plate blank is off-line, the production cost is increased, energy loss is caused, and the delivery date is prolonged; 2. the manganese content is 0.40-0.80%, the aluminum content is 0.06-0.10%, the alloy content is high, and the alloy cost is high; 3. the hardness of HV5 is 150-220, the hardness fluctuation range is large, and the processing is not favorable for stable processing; 4. elongation A80mm5-10%, low elongation, and difficult to meet the processing requirements of complex parts.
Disclosure of Invention
The invention aims to provide a cold-rolled steel plate for a motor vehicle silencing piece and a production method thereof, and mainly solves the technical problems that the existing cold-rolled steel plate for the motor vehicle silencing piece has large hardness fluctuation, low elongation and high production cost, and can not meet the preparation requirement of the motor vehicle silencing piece. The cold-rolled steel plate has excellent surface property, mechanical property and forming property, low production cost and simple production process.
The invention adopts the technical scheme that a cold-rolled steel plate for a motor vehicle noise damping sheet comprises the following chemical components in percentage by weight: c: 0.055-0.075%, Si not more than 0.02%, Mn: 0.25-0.35%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Al: 0.02-0.05%, N: 0.012-0.017% and the rest is Fe and other inevitable impurities.
The metallographic structure of the cold-rolled steel plate is fine-grained ferrite and free cementite, the grain size grade of the ferrite in the metallographic structure is I9.0-10.0 grade, and the yield strength R of the cold-rolled steel plate with the thickness of 0.20-0.45 mmp0.2420 to 520MPa, tensile strength Rm490 to 590MPa, hardness of 155 to 200HV1, and elongation after break A80mm10 to 15 percent.
The cold-rolled steel sheet of the invention is used for manufacturing a sound-deadening sheet for a motor vehicle.
The reason why the chemical composition of the cold-rolled steel sheet for the automotive muffling segment of the present invention is limited to the above range is as follows:
carbon: carbon is a strengthening element, and increasing the carbon content is advantageous for improving strength, but too high a carbon content forms more coarse and brittle carbide particles in the steel, which is disadvantageous for plasticity and toughness, and too high a carbon content also segregates in the center of the steel sheet, which is disadvantageous for formability of bending properties. Comprehensively considered, the content of C is set to be 0.055-0.075 percent;
silicon: the low silicon content is beneficial to improving the surface quality of the material, and the product adopts Al deoxidation and does not contain Si. Comprehensively considered, the Si content is set to be less than or equal to 0.02 percent;
manganese: mn acts as solid solution strengthening in steel to improve strength, and if the Mn content is too high as a material for stamping, formability is reduced, cost is increased, and economy is lowered. Comprehensively considered, the Mn content is set to be 0.25-0.35 percent;
phosphorus: p is generally dissolved in ferrite in a solid state, has a strong solid solution strengthening effect, has a serious segregation tendency, is diffused in pearlite and the ferrite slowly, is not easy to be homogenized to generate a high phosphorus zone and a low phosphorus zone, and increases the solid solution strengthening effect of phosphorus on steel along with the increase of the phosphorus content in the steel, so that a banded structure is increased, the strength and the hardness of a steel plate are increased, the plasticity and the toughness are rapidly reduced, and the formability is deteriorated. Comprehensively considered, the P is set to be less than or equal to 0.02 percent;
sulfur: in the stamping deformation process, sulfide inclusions serve as stress concentration sources and firstly crack, or the inclusions are separated from a metal matrix to generate fine pores, and the pores grow continuously along with the deformation process and further expand to cause cracking of a steel plate. To ensure a certain formability, it is required to reduce the sulfur content in the steel. The technical scheme of the invention sets S to be less than or equal to 0.02 percent;
aluminum: the aluminum plays a role in deoxidation in the present invention, and is a strong oxidizing forming element, and oxygen in steel is removed as Al2O3 in steel making. Too high an aluminum content can lead to excessive Al formation2O3Inclusion and the continuous casting are easy to block the casting nozzle. Comprehensively considered, the Al content is set to be 0.02-0.05%.
Nitrogen: nitrogen can form nitrides in steel and can be dissolved and remained in solidified gaps. The steel has obvious effect on the performance of the steel, improves the strength and the hardness and reduces the plasticity. For the steel for the automotive silencing plate, the nitrogen content needs to be controlled within a proper range, so that the hardness is ensured, and the performance is not deteriorated. Comprehensively considered, the content of N is set to be 0.012-0.017 percent.
A method for producing a cold rolled steel sheet for a noise-canceling sheet for a motor vehicle, the method comprising:
the molten steel is continuously cast to obtain a continuous casting slab, which comprises the following chemical components in percentage by weight: c: 0.055-0.075%, Si not more than 0.02%, Mn: 0.25-0.35%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Al: 0.02-0.05%, N: 0.012-0.017% and the rest is Fe and other inevitable impurities;
heating the continuous casting plate blank to 1170-1210 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-pass continuous rolling, the rolling is carried out at a temperature above the austenite recrystallization temperature, and the finish temperature of the rough rolling is 1010-1050 ℃; after rough rolling, controlling the thickness of the intermediate blank to be 35-40 mm; the finish rolling is 7-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling temperature is 840-880 ℃, the finish rolling reduction rate is 92% -95%, after the finish rolling, the thickness of the steel plate is controlled to be 2.0-2.6 mm, the laminar cooling adopts front-section cooling, and a hot rolled steel coil is obtained when the coiling temperature is 520-560 ℃;
the hot-rolled steel coil is uncoiled again, then is subjected to acid pickling, cold rolling, annealing and leveling in a vertical continuous annealing furnace, and is coiled to obtain a finished cold-rolled steel plate with the thickness of 0.20-0.45 mm, wherein the cold rolling reduction rate is 83-90%, the annealing temperature of the cold-rolled hard steel strip in a soaking section of the vertical continuous annealing furnace is 590-610 ℃, and the annealing time of the steel strip in the soaking section is 90-120 s; the flat elongation is 1.0-1.8%.
The hot rolling process is the key technology for realizing the invention, and the component system A of the invention is calculated3At 840 ℃ A1Is 748 ℃; the hot rolling process adopted by the invention is based on the component system and the calculated phase change point, and the production process adopted by the invention has the following reasons:
1. setting of heating temperature of continuous casting slab
It is found that the slab heating temperature must first be sufficient to dissolve the alloying elements such as Al in a solid solution, but if the heating temperature is too high, the prior austenite grains become coarse, the steel structure becomes coarse, the formability is not good, and excessive energy is consumed. The heating temperature of the continuous casting slab set by the invention is 1170-1210 ℃.
2. Setting of roughing finishing temperature and intermediate slab thickness
In the rough rolling process, in order to recover and recrystallize the crystal grains, the rough rolling finishing temperature should be higher than the austenite recrystallization temperature of the steel, the austenite recrystallization temperature of the steel is 960 ℃, but the rough rolling finishing temperature cannot be too high, otherwise, the heating temperature of the continuous casting slab must be increased, and the energy consumption is increased. The rough rolling finishing temperature is set to 1010-1050 ℃.
The thickness of the intermediate billet is enough to ensure the reduction rate of finish rolling, but the excessive thickness of the intermediate billet can increase the load of finish rolling equipment, influence the rolling speed and reduce the production efficiency, and the thickness of the intermediate billet is set to be 35-40 mm.
3. Setting of finish Rolling finishing temperature
The finish rolling finish temperature of the present invention is set to obtain an ultrafine grain structure in a hot rolled steel sheet by finishing the rolling deformation near the austenite critical temperature, and it is necessary to ensure a large deformation amount at a relatively low temperature. Rolling in a lower temperature range of an austenite non-recrystallization region to obtain flat austenite grains with a deformation zone inside, increasing the grain boundary area, increasing a phase change nucleation core, converting into fine ferrite grains in the subsequent laminar cooling process, and performing the function of fine grain strengthening. Therefore, when the finish rolling temperature is too high, the fine grain strengthening effect cannot be exerted, and when the finish rolling temperature is too low, on one hand, the load of the rolling mill is increased, and on the other hand, the rolling mill enters a two-phase region to roll, so that mixed crystals are generated. Therefore, the finish rolling finishing temperature is set to be 840-880 ℃.
4. Setting of laminar cooling system and hot rolling coiling temperature
The hot rolling coiling temperature is one of key factors influencing the mechanical property, the growth of ferrite grains can be inhibited by the fast cooling speed after deformation, meanwhile, the strip-shaped structure formed by element segregation can be eliminated by the low coiling temperature, but the plasticity and the toughness of the material can be reduced by easily forming the Widmannstatten structure due to the low coiling temperature. Comprehensively considering, the laminar cooling adopts a front-stage cooling mode, and the coiling temperature is set to be 520-560 ℃.
5. Setting of Cold Rolling reduction
The invention adopts one-time cold rolling production, the higher the reduction rate of the cold rolling procedure, the higher the fibrillation degree of crystal grains, and the more the number of defects such as subgrain boundary, dislocation and the like. Therefore, in the continuous annealing process, the larger the number of recrystallization rows, the finer and more uniform the crystal grains after recrystallization. Therefore, the reduction ratio in the cold rolling of the present invention is 83% to 90%.
6. Setting of annealing temperature and annealing time
During the cold rolling of metal, crystal grains are elongated, the orientation of the crystal grains is changed, certain types of textures are formed, and defects in the crystal grains are increased and are reflected in the change of mechanical properties, such as: work hardening, anisotropy in mechanical and physical properties, etc. occur. These defects and variations need to be eliminated by a post-rolling recrystallization annealing process. Therefore, recrystallization annealing is a necessary means to control and change the texture, texture and properties of the metallic material after cold rolling. The properties of finished products are influenced by three processes of recovery, recrystallization and grain growth of the cold-rolled hard steel in the annealing process. In order to enable the annealed steel coil to have proper yield strength, the reasonable annealing temperature is obtained through multiple tests, the annealing temperature of the steel strip in a soaking section of the vertical continuous annealing furnace is set to be 590-610 ℃, and the time in the soaking section is set to be 90-120 s.
7. Setting of the Flat elongation
The flattening mainly ensures that the strip steel obtains good plate shape and eliminates a yield platform, meets the requirements of subsequent high-speed processing on the plate shape and avoids the occurrence of a slip line. The invention sets the leveling elongation rate to be 1.0-1.8%.
The metallographic structure of the cold-rolled steel plate produced by the method is fine-grained ferrite and free cementite, the grain size grade of the ferrite in the metallographic structure is I9.0-10.0 grade, and the yield strength R of the cold-rolled steel platep0.2420 to 520MPa, tensile strength Rm490 to 590MPa, hardness of 155 to 200HV1, and elongation after break A80mm10 to 15 percent.
Compared with the prior art, the invention has the following positive effects: 1. the invention adopts low-carbon steel chemical components with carbon content of 0.055-0.075%, avoids the range of carbon content of 0.08-0.17% in a peritectic reaction zone, has good surface quality of a plate blank, does not need off-line cleaning, can carry out hot charging and hot delivery, saves energy consumption and shortens the production period. 2. The invention fully exerts the strengthening effect of N, so as to reduce the usage amount of alloy elements and reduce the alloy cost of products. 3. The invention adopts the vertical continuous annealing furnace to completely recrystallize and anneal the cold-rolled steel plate, eliminates the internal stress of the cold-rolled steel plate and avoids the plate shape problems of warping and the like caused by stress release during punching parts. 4. The cold-rolled steel sheet of the present invention has a hardness of 155 to 200HV1 and a post-fracture elongation A80mm10-15%, the performance fluctuation is small, the elongation is high, and the requirement of complex punch forming is met.
Drawings
FIG. 1 is a metallographic structure photograph of a cold-rolled annealed steel sheet according to example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to examples 1 to 4, which are shown in tables 1 to 4. Table 1 shows the chemical composition (in weight%) of the steels of the examples of the invention, the balance being Fe and unavoidable impurities.
Table 1 chemical composition of the steels of the examples of the invention, in units: and (4) weight percentage.
Molten steel with chemical components meeting requirements is obtained through converter smelting and LF furnace refining, and continuous casting is carried out on the molten steel under the protection of Ar blowing in the whole process to obtain a continuous casting slab, wherein the thickness of the continuous casting slab is 210-230 mm, the width of the continuous casting slab is 800-1100 mm, and the length of the continuous casting slab is 7000-9500 mm.
And (3) sending the fixed-length plate blank produced in the steel-making process to a heating furnace for reheating, taking out the plate blank from the furnace for descaling, and sending the plate blank to a hot continuous rolling mill for rolling. The rolling is controlled by a rough rolling mill and a finish rolling continuous rolling unit, and the steel is coiled after laminar cooling, wherein the laminar cooling adopts a front-section cooling mode to produce a hot rolled steel coil, and the thickness of the hot rolled steel coil is 2.0-2.6 mm. The hot rolling process control parameters are shown in Table 2.
TABLE 2 Hot Rolling Process control parameters of the inventive examples
And (2) uncoiling the hot rolled steel coil again, carrying out acid pickling, carrying out primary cold rolling on a 5-stand cold continuous rolling mill, wherein the cold rolling reduction rate is 83-90%, annealing and leveling the cold rolled steel strip in a hard rolling state through a vertical continuous annealing furnace, and coiling to obtain a cold rolled steel plate with the thickness of 0.20-0.45 mm. The annealing process comprises the following steps: the annealing temperature of the steel strip in the soaking section of the vertical continuous annealing furnace is 590-610 ℃, and the annealing time in the soaking section is 90-120 s; the leveling elongation is 1.0-1.8%. The control parameters of the cold rolling, annealing and flattening processes are shown in Table 3.
TABLE 3 control parameters of the cold rolling, annealing and leveling processes of the examples of the present invention
| Parameter(s) | Cold rolling reduction/%) | Annealing temperature/. degree.C | Annealing time/s | Percent flat elongation/%) | Thickness/mm of cold-rolled steel sheet |
| The invention | 83～90 | 590～610 | 90～120 | 1.0～1.8 | 0.20～0.45 |
| Example 1 | 90 | 605 | 95 | 1.1 | 0.2 |
| Example 2 | 88 | 601 | 103 | 1.3 | 0.26 |
| Example 3 | 85 | 594 | 110 | 1.5 | 0.38 |
| Example 4 | 85 | 590 | 116 | 1.6 | 0.4 |
Referring to fig. 1, the metallographic structure of the cold-rolled annealed steel sheet is fine-grained ferrite and free cementite, the grain size grade of the ferrite in the metallographic structure is I9.0-10.0 grade, and the yield strength R of the cold-rolled steel sheetp0.2420 to 520MPa, tensile strength Rm490 to 590MPa, hardness of 155 to 200HV1, and elongation after break A80mm10 to 15 percent.
The cold-rolled steel sheet obtained by the present invention was subjected to tensile, microstructure and hardness tests according to a metallic material tensile test method (GB/T228.1), a steel microstructure evaluation method (GB/T13299) and a metallic material Vickers hardness test (GB/T4340.1), and the properties of the cold-rolled steel sheet are shown in Table 4.
TABLE 4 Performance index of cold-rolled steel sheets according to examples of the present invention
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (4)
1. A cold-rolled steel plate for a motor vehicle noise damping sheet comprises the following chemical components in percentage by weight: c: 0.055-0.075%, Si not more than 0.02%, Mn: 0.25-0.35%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Al: 0.02-0.05%, N: 0.012-0.017% and the rest is Fe and other inevitable impurities; yield strength R of cold-rolled steel sheet with thickness of 0.20-0.45 mmp0.2420 to 520MPa, tensile strength Rm490 to 590MPa, hardness of 155 to 200HV1, and elongation after break A80mm10 to 15 percent.
2. The cold-rolled steel sheet for a motor vehicle noise-damping sheet according to claim 1, wherein the metallographic structure of said cold-rolled steel sheet is fine crystalline ferrite + free cementite, and the grain size of the ferrite in said metallographic structure is in the order of i 9.0 to 10.0.
3. A production method of a cold-rolled steel plate for a motor vehicle noise damping sheet is characterized by comprising the following steps:
the molten steel is continuously cast to obtain a continuous casting slab, which comprises the following chemical components in percentage by weight: c: 0.055-0.075%, Si not more than 0.02%, Mn: 0.25-0.35%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Al: 0.02-0.05%, N: 0.012-0.017% and the rest is Fe and other inevitable impurities;
heating the continuous casting plate blank to 1170-1210 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-pass continuous rolling, the rolling is carried out at a temperature above the austenite recrystallization temperature, and the finish temperature of the rough rolling is 1010-1050 ℃; after rough rolling, controlling the thickness of the intermediate blank to be 35-40 mm; the finish rolling is 7-pass continuous rolling, the finish rolling is carried out in an austenite non-recrystallization region, the finish rolling finishing temperature is 840-880 ℃, the finish rolling reduction rate is 92% -95%, after the finish rolling, laminar cooling adopts front-section cooling, and a hot-rolled steel coil is obtained when the coiling temperature is 520-560 ℃;
the hot-rolled steel coil is uncoiled again, then is subjected to acid pickling, cold rolling, annealing and leveling in a vertical continuous annealing furnace, and is coiled to obtain a finished cold-rolled steel plate with the thickness of 0.20-0.45 mm, wherein the cold rolling reduction rate is 83-90%, the annealing temperature of the cold-rolled hard steel strip in a soaking section of the vertical continuous annealing furnace is 590-610 ℃, and the annealing time of the steel strip in the soaking section is 90-120 s; the flat elongation is 1.0-1.8%.
4. The method of manufacturing a cold rolled steel sheet for a noise-canceling sheet for a motor vehicle as claimed in claim 3, wherein the thickness of the steel sheet is controlled to be 2.0 to 2.6mm after the hot rolling and finish rolling.
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