A kind of cold-rolled strip steel production and manufacturing process

Abstract

The present application discloses a cold-rolled steel strip production and manufacturing process, which relates to the field of metallurgical technology, and comprises the following steps: S1, heating the steel strip blank, and then performing rough rolling and finish rolling to obtain a hot-rolled plate; S2, pickling the hot-rolled plate and then performing cold rolling to obtain a cold-rolled plate; S3, annealing the cold-rolled plate to obtain a pre-treated steel strip; S4, deforming the pre-treated steel strip; and simultaneously rapidly cooling the pre-treated steel strip by steam jet; S5, performing dislocation pinning strengthening treatment on the cooled pre-treated steel strip, performing flattening treatment after the dislocation pinning strengthening treatment, and then performing an electrogalvanizing layer; the combination of deformation treatment and rapid cooling can shorten the production cycle and improve production efficiency, because rapid cooling can quickly reduce the temperature of the material, reduce the waiting time for material cooling, and increase the number of natural dislocations and increase their uniformity in the steel strip.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a production and manufacturing process of cold-rolled strip steel. Background Art

[0002] Strip steel is a kind of steel in coiled form with a certain width, usually produced by hot rolling or cold rolling. It has excellent mechanical properties and processing properties, so it is widely used in construction, automobiles, home appliances and other fields.

[0003] For example, the Chinese patent, application number CN202010564620.3, is a kind of ultra-high yield ratio steel and its production process. After the strip is rapidly cooled, a dislocation source is provided by pre-strain treatment, and a dislocation pinning strengthening treatment is adopted after the pre-strain treatment; wherein, the dislocation pinning strengthening steel is a low-alloyed steel with a carbon content of 0.02%-0.77%; its production process is: the process path is: cold-rolled strip → continuous annealing → rapid cooling → pre-strain treatment → dislocation pinning strengthening treatment, and the ultra-high yield ratio steel of this scheme has sufficient plasticity and good welding performance. It can be used to make parts that require good shape stability, high deformation resistance, and high hole expansion requirements, such as battery guards, bumpers, seat rails, reinforcements, and measuring tools for automobiles. It can also be used to manufacture spring steel that requires a high elastic limit.

[0004] However, the natural dislocation of martensite produced only by rapid cooling and the artificial dislocation produced by pre-strain treatment make the dislocation uneven, resulting in local high dislocation density and cracks. Summary of the invention

[0005] The embodiment of the present application provides a cold-rolled strip steel production and manufacturing process, specifically applies metallurgical technology, solves the problem of fewer natural dislocations and uneven dislocations in the prior art, and achieves the technical effect of uniform dislocations in the strip steel.

[0006] The present application embodiment provides a cold-rolled steel strip production and manufacturing process, and the specific steps include:

[0007] S1, heating the steel slab, and then performing rough rolling and finish rolling to obtain a hot rolled plate;

[0008] The strip steel slab is medium carbon steel or high carbon steel;

[0009] S2, pickling the hot-rolled plate and then cold-rolling it to obtain a cold-rolled plate;

[0010] S3, annealing the cold-rolled sheet to obtain a pretreated strip steel;

[0011] Among them, the annealing temperature is 800-1000℃, and the holding time is 0.2-3min;

[0012] S4, deforming the pretreated steel strip; and rapidly cooling the pretreated steel strip by steam jet;

[0013] S5. The pretreated strip steel after cooling is subjected to dislocation pinning strengthening treatment, and then subjected to flattening treatment, and then subjected to electrogalvanizing.

[0014] Furthermore, in step S4, the cooling rate is 15°C / s. When cooled to 150°C, the cooling rate is reduced to 5°C / s until reaching room temperature.

[0015] Furthermore, in step S4, the deformation treatment is continuous rolling, straightening and bending, and the dislocation source deformation amount is 0.01%-5%.

[0016] Furthermore, in step S5, the temperature of the dislocation pinning strengthening treatment is 150-400° C. and the time is 5-30 min.

[0017] Furthermore, the deformation process in step S4 includes a first deformation process and a second deformation process.

[0018] Furthermore, the temperature of the first deformation treatment is 350-400°C; the temperature of the second deformation treatment is 100-150°C.

[0019] Furthermore, in step S5, the pretreated strip steel is subjected to dislocation pinning strengthening treatment after each deformation treatment; after all the dislocation pinning strengthening treatments are completed, a flattening treatment is performed, and then an electrogalvanizing layer is performed.

[0020] Furthermore, the temperature of each dislocation pinning strengthening treatment is consistent with the temperature during deformation, and the time is 5-30 minutes.

[0021] Furthermore, after the first deformation treatment, the temperature is lowered to 0°C, and then raised to 100-150°C before the second deformation treatment, and the heating rate is 5°C / s;

[0022] In step S5, the temperature is raised to 200°C and then a dislocation pinning strengthening treatment is performed. The temperature is continuously raised during the dislocation pinning strengthening treatment and the temperature is 500°C at the end.

[0023] Further, in step S4, the temperature reduction speed after the first deformation treatment is divided into high speed 20-45°C / s, medium speed 15-20°C / s, and low speed 5-15°C / s;

[0024] When the temperature drops to 0℃, it starts to heat up. The heating speed is also divided into high speed 20-45℃ / s, medium speed 15-20℃ / s, and low speed 5-15℃ / s;

[0025] The product performance and scene adaptability can be controlled by combining the speeds of the heating and cooling stages.

[0026] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0027] First, annealing can refine the grains of the material and improve the ability to transform iron and cementite into austenite, thereby increasing the amount of austenite, the amount of martensite and bainite transformed during the cooling process, and the dislocation density generated in this process. The higher the annealing temperature, the more austenite there is, and the shorter the holding time, the smaller the volume of austenite, which prevents fracture caused by excessive volume expansion when austenite is transformed into martensite and bainite. The electroplated zinc layer can significantly improve the corrosion resistance of the strip and extend its service life. Compared with traditional heat treatment processes, the combination of deformation treatment and rapid cooling can shorten the production cycle and improve production efficiency, because rapid cooling can quickly reduce the temperature of the material, reduce the waiting time for material cooling, and increase the number of natural dislocations and increase their uniformity in the strip.

[0028] Second, before the first deformation treatment and dislocation pinning strengthening treatment, the natural dislocation in the strip is increased by rapidly cooling from high temperature. Then, when the temperature is reduced to 600-400°C, austenite begins to transform into upper bainite, the crystal volume expands, dislocations are generated, and the upper bainite sheet has a certain brittleness. When the deformation treatment is carried out, the dislocation density is further increased. When the temperature is further reduced to 150°C, the austenite is transformed into martensite and a large number of natural dislocations are generated. After the deformation treatment, the dislocation density is strengthened, and the dislocation pinning strengthening treatment is carried out to further strengthen the pinning effect;

[0029] Third, by first lowering the temperature to 0°C, the internal structure of the material will undergo a process of contraction and stabilization, and then heating it to 100-150°C for a second deformation treatment, effectively adjusting the internal stress distribution of the material, further refining the grains, and optimizing the crystal structure, thereby improving its heat resistance and corrosion resistance;

[0030] Fourthly, through different combinations, strip steel has more application scenarios, and the parameters and steps of each link can be controlled separately. DETAILED DESCRIPTION

[0031] Embodiment 1: A cold-rolled steel strip production and manufacturing process of the present application includes:

[0032] S1, heating the steel slab, and then performing rough rolling and finish rolling to obtain a hot rolled plate;

[0033] The strip steel slab is medium carbon steel or high carbon steel;

[0034] S2, pickling the hot-rolled plate and then cold-rolling it to obtain a cold-rolled plate;

[0035] S3, annealing the cold-rolled sheet to obtain a pretreated strip steel;

[0036] Among them, the annealing temperature is 800-1000℃, and the holding time is 0.2-3min;

[0037] S4, deforming the pretreated steel strip; and rapidly cooling the pretreated steel strip by steam jet;

[0038] The cooling rate is 15°C / s; the deformation treatment is continuous rolling, straightening, and bending, and the dislocation source deformation is 0.01%-5%;

[0039] When cooled to 150°C, the cooling rate is reduced to 5°C / s until room temperature;

[0040] S5, performing a dislocation pinning strengthening treatment on the pretreated strip steel after cooling, performing a flattening treatment after the dislocation pinning strengthening treatment, and then performing an electrogalvanizing layer;

[0041] The temperature of the dislocation pinning strengthening treatment is 200-500°C and the time is 5-30min.

[0042] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0043] Annealing refines the grains of the material and improves the ability to transform iron and cementite into austenite, which increases the amount of austenite, the amount of martensite and bainite transformed during the cooling process, and the dislocation density generated in this process. The higher the annealing temperature, the more austenite there is, and the shorter the holding time, the smaller the austenite volume, which prevents fracture caused by excessive volume expansion when austenite is transformed into martensite and bainite. The electroplated zinc layer can significantly improve the corrosion resistance of the strip and extend its service life.

[0044] When the strip is cooled to 150°C, the cooling rate is reduced to 5°C / s until it reaches room temperature, releasing the internal stress generated by the previous rapid cooling and deformation treatment, while avoiding the structural inhomogeneity caused by excessive cooling rate, and balancing the strength, toughness and plasticity of the steel strip;

[0045] Rapid cooling promotes the transformation of austenite in steel into martensite, thereby improving its hardness and strength; dislocation pinning strengthening treatment can increase the yield strength of the material, because the dislocation pinning effect will hinder the movement of dislocations, thereby increasing the material's ability to resist deformation; deformation treatment can improve the shape of the plate, solve the problem of plate deformation or morphological defects, and also provide more dislocation points to facilitate subsequent pinning effects. The dislocation pinning effect can improve the material's fatigue resistance and increase the material's service life;

[0046] Rapid cooling also refines the grains, reduces thermal movement, and fixes the dislocation structure in the strip. At the same time, the deformation process causes the introduced mechanical stress to promote the generation and movement of dislocations, further increasing the dislocation density.

[0047] Deformation treatment will produce a large number of dislocations and substructures inside the material, and rapid cooling will quickly fix these strengthening effects to prevent recovery or recrystallization and softening at high temperatures, thereby maintaining the deformation strengthening effect of the material; through the combination of deformation treatment and rapid cooling, the surface hardness and density of the material will be improved, thereby enhancing its wear resistance and corrosion resistance;

[0048] In this embodiment, the size of the dislocation pins is relatively small, at the nanometer level, 1-10 nanometers wide, and the length can extend from hundreds of nanometers to micrometers. They are evenly distributed in the lattice of the strip steel. The dislocations are randomly distributed in the lattice of the strip steel material, but tend to gather at grain boundaries, subgrain boundaries and deformation bands. There are about 800-1500 dislocation points per square micron. The dislocations are arranged in an irregular network, and some dislocations are entangled with each other or form dislocation walls.

[0049] Embodiment 2: The above embodiment fixes a large number of dislocation effects by rapidly cooling during deformation treatment to prevent recovery or recrystallization and softening at high temperature. In order to increase the dislocation density, further improvements are made on the basis of embodiment 1.

[0050] S4, performing a first deformation treatment and a second deformation treatment on the pretreated steel strip, and rapidly cooling the pretreated steel strip by steam jet;

[0051] Specifically, the first deformation treatment is carried out at 350-400℃, and the second deformation treatment is carried out at 100-150℃; each deformation treatment is one or more combinations of continuous rolling, straightening, and bending, and the dislocation source deformation amount is 0.01%-5%;

[0052] S5, performing dislocation pinning strengthening treatment on the pretreated strip steel after each deformation treatment; performing flattening treatment after completing all dislocation pinning strengthening treatments, and then performing electrogalvanizing;

[0053] The temperature of each dislocation pinning strengthening treatment is consistent with the temperature during deformation; the time is 5-30 minutes.

[0054] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0055] Before the first deformation treatment and dislocation pinning strengthening treatment, the natural dislocation in the strip is increased by rapidly cooling from high temperature. Then, when the temperature is reduced to 600-400°C, austenite begins to transform into upper bainite, the crystal volume expands, dislocations are generated, and the upper bainite sheet has a certain brittleness. When the deformation treatment is carried out, the dislocation density is further increased. When the temperature is further reduced to 150°C, the austenite is transformed into martensite and a large number of natural dislocations are generated. After the deformation treatment, the dislocation density is strengthened, and the dislocation pinning strengthening treatment is carried out to further strengthen the pinning effect. By refining the grains and increasing the dislocation density, the corrosion resistance of the strip can be improved. A finer grain structure and a higher dislocation density can increase the electrochemical stability of the material, thereby slowing down the corrosion process.

[0056] After annealing, the steel strip is immediately cooled rapidly using steam jet rapid cooling technology. Through rapid cooling, a layer of high-density dislocation pins can be formed on the surface of the steel strip. Since the cooling speed inside is relatively slow, the density of dislocation pins is low. The high-density dislocation pins form a "strengthening layer" on the surface of the steel strip. The dislocations in this strengthening layer are entangled and pinned with each other, which increases the hardness and wear resistance of the surface layer, similar to work hardening, so that the surface of the steel strip can maintain good performance when subjected to friction or wear; the low-density dislocation pins inside mean that the material has relatively good plasticity and toughness inside, so that the steel strip can undergo plastic deformation without breaking when subjected to external forces; the high-density dislocation pins form a "barrier" on the surface of the steel strip, which can hinder cracks. The low-density dislocation pins inside reduce the stress concentration points inside the material, reduce the possibility of crack initiation inside the material, and further enhance the fatigue resistance of the steel strip;

[0057] This dislocation nail density distribution makes the steel belt present the characteristics of "hard outside and tough inside" in terms of mechanical properties; the high hardness and high wear resistance of the surface layer enable the steel belt to maintain good performance when subjected to wear or impact; and the good plasticity and toughness of the internal layer enable the steel belt to undergo a certain deformation without breaking when subjected to external forces; the surface and internal dislocation nail density distribution work together to improve the fatigue resistance of the steel belt, making the steel belt less prone to fatigue fracture during long-term use; it not only ensures the wear resistance and hardness of the surface, but also the plasticity and toughness of the interior, meeting the material performance requirements of different application scenarios; by optimizing the dislocation nail density distribution, the material usage can be reduced and the material utilization rate can be improved while ensuring the material performance.

[0058] In this embodiment, compared with the embodiment, the size of the dislocation pins is more slender and the number is significantly increased. The number of dislocation points per square micron is increased to 1300-2000. Especially after the second deformation treatment and dislocation pinning strengthening treatment, the dislocation density is further improved, and the dislocations are more densely distributed near the deformation band and grain boundary, forming an obvious dislocation entanglement zone. The dislocation network is more complex, and more dislocation walls and dislocation cell structures appear.

[0059] Embodiment 3: Embodiment 2 is further improved on the basis of Embodiment 2 by increasing the dislocation density through two deformation treatments and dislocation pinning strengthening treatments to optimize the crystal structure in order to improve the corrosion resistance of the steel strip.

[0060] In step S4, the second deformation treatment is performed by lowering the temperature to 0°C after the first deformation treatment and then heating it to 100-150°C, with a heating rate of 5°C / s;

[0061] In step S5, the temperature is raised to 200°C and then a dislocation pinning strengthening treatment is performed. The temperature is continuously raised during the dislocation pinning strengthening treatment and the temperature is 500°C at the end.

[0062] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0063] By first lowering the temperature to 0°C, the internal structure of the material shrinks and then stabilizes, eliminating or reducing the residual stress generated after the first deformation treatment, and then heating it to 100-150°C for the second deformation treatment, effectively adjusting the internal stress distribution of the material, further refining the grains, and optimizing the crystal structure to form more uniform and fine grains, as well as more complex dislocation structures, increasing the electrochemical stability of the material, and improving its heat resistance and corrosion resistance;

[0064] At low temperatures, the brittleness of the material increases, which makes it easier to introduce dislocations and change the crystal structure during deformation. When the temperature is raised for deformation, the deformation effect can be further optimized when the material has a certain plasticity, the dislocation density can be increased and further multiplied and entangled, and the residual stress generated after the first deformation treatment can be eliminated or reduced, thereby enhancing the strength of the material. The heat resistance and corrosion resistance of the steel strip are enhanced by over-refining the grains and optimizing the crystal structure. Fine grains and high-density dislocations can increase the electrochemical stability of the material and slow down the corrosion process. After low-temperature deformation treatment, the temperature is raised again to adjust the internal stress distribution of the material, reduce stress concentration points, and thus reduce the possibility of crack initiation. At the same time, high-density dislocations can hinder the expansion of cracks and improve the fatigue resistance of the material.

[0065] The material structure after the second deformation treatment is more uniform and the dislocation density is higher, which provides better conditions for the subsequent dislocation pinning strengthening treatment; the strengthening treatment will be more effective and can further improve the mechanical properties of the material; during the continuous heating process, the dislocation pinning strengthening treatment can dynamically adjust the strengthening effect of the material with the change of temperature. As the temperature rises, the activity of dislocations increases, the process of dislocation pinning and depinning becomes more frequent, and the internal stress of the material is released and the organization is homogenized. If the temperature is kept unchanged during the dislocation pinning strengthening treatment, the material will be over-strengthened in local areas, affecting the overall performance of the material. Continuous heating can make the strengthening effect more uniform and avoid local over-strengthening. The main working principle of dislocation pinning strengthening is to hinder the movement of dislocations through the pinning effect of solute atoms, second phase particles, etc., thereby improving the strength and hardness of the material. During the continuous heating process, the dynamic balance of dislocation pinning and depinning will be adjusted with the temperature change, so that the internal stress of the material is released and the organization is homogenized.

[0066] In this embodiment, compared with the second embodiment, since the temperature is first lowered to 0°C and then raised to 100-150°C for the second deformation treatment, the size of the dislocation pins is smaller and more uniform, and the grain refinement leads to a further increase in the dislocation density. The number of dislocation points per square micron reaches 1800-2500. Dislocations are not only distributed at grain boundaries and deformation bands, but also appear inside newly formed grains. The dislocation network is denser, forming a complex dislocation maze structure. The size difference of dislocations may be more significant, with both long and thin dislocation lines and short and thick dislocation segments.

[0067] Embodiment 4: Embodiment 3 improves the chemical corrosion resistance of the steel strip by cooling and then heating the material during the second deformation process. In order to improve its adaptability and meet the needs of different scenarios, the cooling and heating rates are further adjusted, which is an improvement on the basis of Embodiment 3.

[0068] In step S4, the temperature is reduced from the temperature after the first deformation treatment at a high speed of 20-45°C / s, a medium speed of 15-20°C / s, and a low speed of 5-15°C / s;

[0069] When the temperature drops to 0℃, it starts to heat up. The heating speed is also divided into high speed 20-45℃ / s, medium speed 15-20℃ / s, and low speed 5-15℃ / s;

[0070] The product performance and scene adaptability can be controlled by combining the speeds of the heating and cooling stages.

[0071] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0072] High-speed cooling can quickly pass through certain sensitive temperature ranges of the material, reduce the possible organizational changes or formation of undesirable phases in this range, maintain the original organizational state of the material, increase the material's supercooling, promote nucleation, and help refine the grains; it is suitable for materials that need to quickly pass through a specific temperature range to avoid undesirable organizational changes, or for scenarios where finer grains are required to improve material strength.

[0073] Medium-speed cooling maintains a certain cooling rate while giving the material a certain amount of time to release internal stress and adjust the structure, reducing the residual stress caused by rapid cooling. It is suitable for material processing scenarios that avoid excessive residual stress.

[0074] Slow-speed cooling provides the material with more time to release internal stress and homogenize the structure, so as to obtain a more stable structure and a lower residual stress level; it is suitable for scenarios with high requirements on the internal stress state of the material, such as precision instrument parts, high-stress components, etc.

[0075] Rapid heating can shorten the time that the material stays at low temperatures and reduce the adverse effects that may be caused by long-term low-temperature exposure (such as increased brittleness). At the same time, rapid heating promotes the recrystallization and grain growth process of the material and improves the processing performance of the material. It is suitable for scenarios where the deformation processing temperature needs to be reached quickly to improve production efficiency, or for processing materials that are sensitive to low-temperature brittleness.

[0076] Medium-speed heating maintains a certain heating rate while giving the material a certain amount of time to preheat and homogenize the internal structure, reducing the thermal stress caused by rapid heating. It is suitable for material processing scenarios that have certain requirements for heating rate and hope to avoid excessive thermal stress.

[0077] Slow heating rate provides the material with more time to preheat and homogenize the internal structure, obtain a more uniform structure and lower thermal stress level, control the phase change process of the material, and obtain an ideal phase composition. It is suitable for scenarios with high requirements for the uniformity of the internal structure of the material and the control of the phase change process, such as the heat treatment of high-performance alloy materials.

[0078] Rapid heating and cooling are suitable for materials that need to quickly pass through sensitive temperature ranges to avoid undesirable structural transformation, such as rapid heat treatment of certain high-temperature alloys. This combination helps to refine grains and improve the strength and hardness of materials. In the quenching process of steel materials, after rapidly heating to the austenitizing temperature, it is quickly cooled to room temperature to obtain a high-hardness martensitic structure;

[0079] Rapid heating and slow cooling are suitable for materials that need to quickly reach phase change conditions at high temperatures and then optimize the structure through slow cooling. This combination helps to reduce residual stress, improve the toughness and fatigue life of the material; in the aging treatment of aluminum alloys, the temperature is quickly raised to the solution treatment temperature, maintained for a period of time, and then slowly cooled to room temperature to obtain a good strengthening effect.

[0080] Slow heating and rapid cooling are suitable for materials that are less sensitive to temperature but require precise control of the phase change process. Slow heating helps to homogenize the internal structure of the material, while rapid cooling helps to fix the required phase structure. During the sintering process of ceramic materials, slow heating is used to avoid cracking, followed by rapid cooling to fix the microstructure.

[0081] Slow heating and cooling are suitable for scenes with extremely high requirements on the internal stress state and organizational uniformity of the material. Slow heating and cooling can help to fully release the internal stress of the material and homogenize the organizational structure. In the process of precision casting or heat treatment, slow heating and cooling are used to obtain high-quality castings or workpieces with low stress and high uniformity.

[0082] Through different combinations, strip steel has more application scenarios, and the parameters and steps of each link can be controlled separately.

[0083] With C: 0.4%, Si: 1.25%, Mn: 2.23%, P: 0.01%, S: 0.005%, Al: 0.05%, according to Example 1 to Example 4 and Comparative Example (Application No.: CN202010564620.3 A production process of ultra-high yield ratio steel), the temperature of the dislocation pinning strengthening treatment is 300°C; the time is 15min, the temperature of the dislocation pinning strengthening treatment is 300°C; the time is 15min, and Example 4 takes the annealing temperature to -350°C using rapid cooling, 350°C-150°C using rapid cooling, 150°C-0°C using medium-speed cooling as an example, and a periodic infiltration test (72 hours) is used for corrosion resistance comparison test; its yield strength, tensile strength and corrosion resistance; the specific results are as follows:

[0084] Thickness (mm) Yield strength (MPa) Tensile strength (MPa) <![CDATA[Corrosion rate (g / m 2 / h)]]> Embodiment 1 1.5 1065 1022 4.31 Embodiment 2 1.5 1120 1036 3.62 Embodiment 3 1.5 1168 1055 3.42 Embodiment 4 1.5 1254 1021 2.3 Comparative Example 1.5 985 1020 5.21

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cold-rolled steel strip production and manufacturing process, characterized in that: The specific steps include: S1, heating the steel slab, and then performing rough rolling and finish rolling to obtain a hot rolled plate; The strip steel slab is medium carbon steel or high carbon steel; S2, pickling the hot-rolled plate and then cold-rolling it to obtain a cold-rolled plate; S3, annealing the cold-rolled sheet to obtain a pretreated steel strip; Among them, the annealing temperature is 800-1000℃, and the holding time is 0.2-3min; S4, subjecting the pretreated steel strip to the first deformation treatment and the second deformation treatment, and subjecting the pretreated steel strip to rapid cooling by steam jetting, with a cooling rate of 15°C / s; when cooled to 150°C, the cooling rate is reduced to 5°C / s until reaching room temperature; Specifically, the first deformation treatment is carried out at 350-400℃, and the second deformation treatment is carried out at 100-150℃; each deformation treatment is one or more combinations of continuous rolling, straightening, and bending, and the dislocation source deformation amount is 0.01%-5%; S5, performing dislocation pinning strengthening treatment on the pretreated strip steel after each deformation treatment; performing flattening treatment after completing all dislocation pinning strengthening treatments, and then performing electrogalvanizing; The temperature of each dislocation pinning strengthening treatment is consistent with the temperature during deformation; the time is 5-30 minutes.

2. A cold-rolled steel strip production and manufacturing process as claimed in claim 1, characterized in that: The temperature of the dislocation pinning strengthening treatment in step S5 is 150-400° C. and the time is 5-30 min.

3. A cold-rolled steel strip production and manufacturing process as claimed in claim 1, characterized in that: After the first deformation treatment, the temperature is reduced to 0°C, and then heated to 100-150°C before the second deformation treatment, with a heating rate of 5°C / s; In step S5, the temperature is raised to 200°C and then a dislocation pinning strengthening treatment is performed. The temperature is continuously raised during the dislocation pinning strengthening treatment and the temperature is 500°C at the end.

4. A cold-rolled steel strip production and manufacturing process as claimed in claim 1, characterized in that: In step S4, the temperature is reduced from the temperature after the first deformation treatment at a high speed of 20-45°C / s, a medium speed of 15-20°C / s, and a low speed of 5-15°C / s; When the temperature drops to 0℃, it starts to heat up. The heating speed is also divided into high speed 20-45℃ / s, medium speed 15-20℃ / s, and low speed 5-15℃ / s; The product performance and scene adaptability can be controlled by combining the speeds of the heating and cooling stages.