CN112048662A - Age-resistant bake-hardening steel plate, galvanized plate thereof and production method - Google Patents
Age-resistant bake-hardening steel plate, galvanized plate thereof and production method Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses an age-resistant bake-hardening steel plate, a galvanized plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: 0.0011-0.0017% of C, 0.015-0.025% of Si, 0.16-0.26% of Mn, 0.015-0.025% of P, less than or equal to 0.003% of S, 0.035-0.065% of Al, 0.030-0.050% of Ti, 0.009-0.013% of V, less than or equal to 0.0030% of N, 0.007-0.010% of B, 0.07-0.09% of Nd, and the balance of Fe and inevitable impurities. The steel plate has good mechanical property, good baking hardenability and aging resistance through reasonable chemical composition design, and parts manufactured by utilizing the characteristics of magnetizers formed in the components have good closeness, so that the steel plate can be used for manufacturing parts such as inner and outer plates of a car door, an engine hood and the like. Particularly, the steel plate structure of the invention is ultra-low carbon ferrite, and the high plastic strain ratio and the high strain hardening index ensure good formability and no cracking phenomenon in the forming process; meanwhile, the size of the deformed part is kept stable.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an aging-resistant bake-hardening steel plate, a galvanized plate thereof and a production method.
Background
With the continuous development of automobile manufacturing, automobile material selection is more scientific, the outer plate of the passenger car is required to have good dent resistance while being thinned, and in order to increase dent resistance, the bake-hardening steel is widely applied to the outer covering part of the passenger car, and the demand is more and more large. Bake hardenability is a phenomenon in which the yield strength is increased due to fixing of the free carbon of ferrite in parts to dislocations at the time of baking finish, a steel sheet having excellent bake hardenability is easily formed before baking, and the final product, i.e., the vehicle body outer cover, has strong dent resistance. Because the steel coil has a certain time period from the leaving of a factory to the baking finish of a stamping part, the steel must have aging resistance to a certain degree so as to ensure the aging for a period of time; after aging, surface defects such as tensile strain marks and the like may be generated in stamping, and the bake hardening effect may be reduced or eliminated.
Regarding the study of bake-hardened steel sheets, the invention patent application of "high-strength bake-hardening cold-rolled steel sheet and method for manufacturing the same" disclosed in patent application publication No. CN103228808A, contains, in terms of mass%, C: 0.0010-0.0040%, Si: 0.005-0.05%, Mn: 0.1-0.8%, P: 0.01 to 0.07%, S0.001 to 0.01%, Al: 0.01-0.08%, N: 0.0010-0.0050%, Nb: 0.002-0.020% and Mo: 0.005-0.050%; the chemical composition further contains at least one selected from Cu, Ni, Cr, Sn, V, W, Ca, Mg, Zr and REM, and the balance is Fe and unavoidable impurities. The steel sheet had a complicated composition system, and it was found that the steel sheet containing Ti, B, V and RE elements in combination was L example from the chemical compositions (tables 1 and 2) of the examples; and the smelting material also contains W, Ca, Mg and Zr, so that the smelting difficulty is high and the cost of the smelting raw materials is greatly increased. In the production process of the steel plate, the hot rolled steel plate is coiled at 700-800 ℃, the cold rolling also needs to be carried out with the temper rolling of more than 1.0% and less than 1.5%, and the cold rolling reduction is adjusted along with the fluctuation of components; the surface of the steel plate is easily oxidized and wastes energy due to overhigh coiling temperature, and the yield and the production efficiency can be reduced due to the excessively complicated cold rolling process and narrow process window; and carrying out continuous annealing at 770-820 ℃, wherein the annealing temperature is difficult to ensure the re-dissolution of precipitated carbon, and the baking hardening value is low. The tensile strength of the steel plate is more than 300MPa and less than 450MPa, and the r value is more than or equal to 1.4; from the performance results (Table 4) of 29 samples, the tensile strength is 284-390 MPa, the BH value is 18-72 MPa, and the r average value is 1.1-1.9; obviously, the performance fluctuation is large, and the continuous stamping requirement of the steel plate applied by automobile enterprises is difficult to meet; moreover, the low bake hardening value (18 MPa) is difficult to satisfy the dent resistance index requirement.
The invention discloses an invention patent application of 'age-resistant cold-rolled bake-hardening steel 180BH and a production method thereof' disclosed in patent application publication No. CN 106756554A, wherein the chemical components comprise, by mass percent, C: 0.001-0.003%, Si is less than or equal to 0.05%, Mn: 0.10-0.35%, P: 0.03-0.06%, S is less than or equal to 0.015%, Als: 0.015 to 0.060%, Nb: 0.005-0.030%, N is less than or equal to 0.0050%, Mo: 0.01 to 0.08%, and the balance of iron and inevitable impurities. The C content in the steel component system fluctuates greatly, the C content based on the upper limit has adverse effect on the timeliness, the timeliness is shortened, and the timeliness resistance is reduced; the P content is higher, which is not good for the brittleness of secondary processing; the coiling temperature is 680-740 ℃, the fluctuation range is large, and the hardening property and the aging resistance stability of the coil-through baking are difficult to ensure; the flat elongation is 0.5-1.20%, the yield platform is long, the ageing resistance and the forming performance are adversely affected, other process windows need to be strictly controlled, and the control difficulty of other process links in the whole process is increased.
Disclosure of Invention
The invention aims to provide an aging-resistant bake-hardening steel plate with 6-month expiration date; the invention also provides a production method of the aging-resistant bake-hardening steel plate; the invention also provides a galvanized sheet of the aging-resistant bake-hardened steel; the invention also provides a production method of the aging-resistant bake-hardening steel galvanized plate.
In order to solve the technical problems, the technical scheme adopted by the steel plate is as follows: the chemical components and the mass percentage content are as follows: 0.0011-0.0017% of C, 0.015-0.025% of Si, 0.16-0.26% of Mn, 0.015-0.025% of P, less than or equal to 0.003% of S, 0.035-0.065% of Al, 0.030-0.050% of Ti, 0.009-0.013% of V, less than or equal to 0.0030% of N, 0.007-0.010% of B, 0.07-0.09% of Nd, and the balance of Fe and inevitable impurities.
The steel plate structure of the steel plate of the invention is ultra-low carbon ferrite.
The steel sheet of the present invention has an aging period of 6 months or more at 50 ℃ or less.
In order to ensure excellent comprehensive performance of the steel plate, the basic principle of limiting the content of each element is as follows:
c: solid solution strengthening and bake hardening elements; if the content of C is too low, the tensile strength of the steel is insufficient, and the baking hardening value is insufficient; if the C content is too high, the steel will have low plasticity, a high bake hardening value, poor aging resistance and low formability.
Si: is a solid solution strengthening element; the strength of the steel can be obviously improved by adding a small amount of Si, and the raw material cost of the steel grade can be reduced by adding a small amount of Si to reduce the content of other solid solution strengthening elements because the cost of the Si is low. The Si content is too low to play the above role; the high Si content and the poor surface quality of the material affect the galvanizing performance of the steel plate and also affect the welding performance and the forming performance of the steel.
Mn: is a conventional strengthening and toughening element; however, the content of Mn element is too high, on one hand, the cost is increased, the crack sensitivity of a crack welding line and a heat affected zone is increased due to the hardened layer of a welding structure, and on the other hand, the strength is too high, and the plasticity is poor; the Mn content is too low, and the strength can not meet the requirement.
P: in the present invention, P plays a role of solid solution strengthening; when the content of P is less than 0.03%, the effect of solid solution strengthening is lost; when the P content is more than 0.025%, secondary work brittleness occurs and the welding property is also affected.
S: the lower the content in the steel, the better, and more than 0.003% may have an influence on the bake hardenability and the aging resistance of the steel material of the present invention.
Al: the invention mainly plays a role in deoxidation.
Ti: carbon present in the steel is fixed as TiC precipitates as a carbide-forming element, and the carbide-forming element plays a role of controlling the content of solid-solution carbon in the steel and ensures bake hardenability and aging resistance.
V: mainly combines with N to form a vanadium-nitrogen compound, plays a role in fixing nitrogen and simultaneously plays a role in purifying steel.
N: since the aging resistance deteriorates at normal temperature due to the high diffusion rate of N, the lower the N content, the better.
B and Nd: the addition of a certain amount of B prevents grain boundary segregation of other elements to cause secondary work brittleness, and also serves to form a magnetic compound by bonding with an element such as Nd, thereby enhancing the closing action of the opening/closing member made of a steel sheet. But also Nd, but not limited thereto, plays a role in refining grains.
The production method of the steel plate comprises the working procedures of finish rolling, cold rolling and annealing treatment.
The steel plate production method of the invention comprises the following finish rolling procedures: and heating the steel billet to an austenite single-phase region for finish rolling, and controlling the coiling temperature to be 650-670 ℃.
The steel plate production method of the invention comprises the following cold rolling procedures: the cold rolling reduction rate is 76.7-77.3%.
The steel plate production method of the invention comprises the following annealing treatment procedures: carrying out continuous annealing treatment at a soaking temperature of 825-835 ℃, and cooling to 340-390 ℃ at a cooling speed of 20-25 ℃/s in a cooling section; and cooling at a cooling speed of 5-10 ℃/s.
The steel galvanized sheet comprises a cold-rolled steel sheet and a hot-dip galvanized layer.
The production method of the galvanized steel sheet comprises the working procedures of finish rolling, cold rolling and hot-dip galvanizing.
The production method of the galvanized steel sheet comprises the following hot dip galvanizing procedures: the cold-rolled steel plate is continuously annealed at the soaking temperature of 830-840 ℃, then cooled to 460-480 ℃ at the cooling speed of 20-25 ℃/s in a cooling section, and finally immersed in molten zinc to obtain a coating.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention has good mechanical property, good baking hardenability and aging resistance through reasonable chemical component design, and the parts manufactured by utilizing the characteristic of the magnetizer formed in the components have good closeness, so the invention can be used for manufacturing parts such as the inner and outer plates of the door and the inner and outer plates of the engine hood of the car. Particularly, the steel plate structure of the invention is ultra-low carbon ferrite, and the high plastic strain ratio and the high strain hardening index ensure good formability and no cracking phenomenon in the forming process; meanwhile, the size of the deformed part is kept stable.
The method has the advantages that through reasonable chemical component design and production process control, the high-strength, high-plasticity and high-drawing property, good baking hardenability and ageing resistance are realized, and the 6-month expiration date is ensured; meanwhile, in the chemical composition design, a certain amount of B is added to avoid secondary processing brittleness, and a certain amount of Nd is added to form a magnetizer, so that the closing performance of the manufactured opening and closing part is improved, the magnetizer can be used for manufacturing inner and outer plates of a car door and an engine hood, and good market application prospects are embodied.
The galvanized sheet and the production method thereof have 6-month aging period, good strength, plasticity and ductility and good bake hardenability by using the cold-rolled steel sheet as a substrate.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a metallographic microstructure of a steel sheet according to the present invention.
Detailed Description
Examples 1 to 8: the age-resistant bake-hardening steel plate and the galvanized plate thereof and the production method adopt the following processes, wherein the products of examples 1 to 4 are cold-rolled annealed steel plates, and the products of examples 5 to 8 are galvanized plates.
(1) A finish rolling procedure: the billet is reheated to an austenite single-phase region and is directly subjected to finish rolling, the thickness of the rolled plate is controlled to be 2.2-3.0 mm, and the coiling temperature is controlled to be 650-670 ℃.
(2) A cold rolling procedure: a steel coil or a steel plate having a cold rolled thickness of 0.50 to 0.70mm is obtained by subjecting the steel coil or the steel plate to a cold rolling reduction of 76.7 to 77.3%.
(3) An annealing treatment process: examples 1 to 4 cold-rolled annealed steel sheets were obtained by annealing treatment; the annealing process comprises the following steps: carrying out continuous annealing treatment on the steel coil or the steel plate obtained in the step (2) at a soaking temperature of 825-835 ℃, cooling the steel coil or the steel plate to 340-390 ℃ at a cooling speed of 20-25 ℃/s in a cooling section, and keeping the flat elongation at 1.5-1.8%; and cooling to room temperature at the cooling speed of 5-10 ℃/s to obtain the cold-rolled annealed steel plate.
(4) And (3) hot-dip galvanizing procedure: examples 5 to 8 were subjected to hot-dip galvanizing to obtain galvanized sheets; the hot-dip galvanizing process comprises the following steps: and (3) carrying out continuous annealing treatment on the steel coil or the steel plate obtained in the step (2) at a soaking temperature of 830-840 ℃, cooling the steel coil or the steel plate to 460-480 ℃ at a cooling speed of 20-25 ℃/s in a cooling section, and then soaking the steel coil or the steel plate into molten zinc liquid, wherein the finishing elongation is 1.5-1.8%, so as to obtain the galvanized plate.
(5) The specific production processes of the examples according to the above process are shown in Table 1, wherein examples 1-4 are annealing processes and examples 5-8 are hot-dip galvanizing processes.
Table 1: detailed production Process of Each example
(6) The chemical compositions of the products obtained in the respective examples are shown in Table 2, wherein examples 5 to 8 are compositions of cold rolled steel sheets not including a plated layer; the balance in table 2 is Fe and unavoidable impurities.
Table 2: chemical composition of the product obtained in each example
(7) The steel plate obtained by the method has yield strength of 180-200 MPa, tensile strength of 290-330 MPa, elongation of 39-43%, plastic strain ratio (r value) of 1.75-1.95 and strain hardening index (n value) of 0.19-0.23; both have a bake hardenability of 30 to 50 MPa; the effective period is 6 months or more at 50 ℃ or below. As can be seen from FIG. 1, the steel sheet obtained by the method has a ferrite structure; the mechanical properties, bake-hardening properties and aging properties of the steel sheets obtained in the examples are shown in Table 3.
Table 3: mechanical properties, bake-hardening Properties and aging Properties of the Steel sheets obtained in the examples
Claims (10)
1. The aging-resistant bake-hardening steel plate is characterized by comprising the following chemical components in percentage by mass: 0.0011-0.0017% of C, 0.015-0.025% of Si, 0.16-0.26% of Mn, 0.015-0.025% of P, less than or equal to 0.003% of S, 0.035-0.065% of Al, 0.030-0.050% of Ti, 0.009-0.013% of V, less than or equal to 0.0030% of N, 0.007-0.010% of B, 0.07-0.09% of Nd, and the balance of Fe and inevitable impurities.
2. The age resistant bake hardening steel sheet of claim 1, wherein: the steel plate structure is ultra-low carbon ferrite.
3. The age bake hardening resistant steel sheet as claimed in claim 1 or 2, wherein: the steel sheet has an aging period of 6 months or more at 50 ℃ or less.
4. A method of producing age-bake hardenable steel according to claim 1, 2 or 3, characterized in that: comprises the working procedures of finish rolling, cold rolling and annealing treatment.
5. The method for producing an age bake hardening resistant steel sheet as recited in claim 4, wherein the finish rolling process: and heating the steel billet to an austenite single-phase region for finish rolling, and controlling the coiling temperature to be 650-670 ℃.
6. The method for producing an age-bake hardening resistant steel sheet as claimed in claim 4, wherein the cold rolling process: the cold rolling reduction rate is 76.7-77.3%.
7. The method for producing an age bake hardening resistant steel sheet as claimed in claim 4, 5 or 6, wherein the annealing treatment process: carrying out continuous annealing treatment at a soaking temperature of 825-835 ℃, and cooling to 340-390 ℃ at a cooling speed of 20-25 ℃/s in a cooling section; and cooling at a cooling speed of 5-10 ℃/s.
8. A galvanized sheet of age bake hardening resistant steel as claimed in claim 1, 2 or 3, characterized in that: including cold rolled steel sheets and hot-dip galvanized layers.
9. The method for producing an age-bake hardening resistant galvanized steel sheet according to claim 8, wherein: comprises the working procedures of finish rolling, cold rolling and hot-dip galvanizing.
10. The method for producing age resistant bake-hardened steel galvanized sheet according to claim 9, characterized in that the hot dip galvanizing process: the cold-rolled steel plate is continuously annealed at the soaking temperature of 830-840 ℃, then cooled to 460-480 ℃ at the cooling speed of 20-25 ℃/s in a cooling section, and finally immersed in molten zinc to obtain a coating.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411055A (en) * | 2021-12-31 | 2022-04-29 | 河钢股份有限公司 | 220 MPa-grade bake-hardening high-strength steel and production method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1958826A (en) * | 2006-11-10 | 2007-05-09 | 武汉钢铁(集团)公司 | Vanadium treated bake hardening type deep drew steel plates of saloon sedan, and preparation method |
| CN102719741A (en) * | 2012-06-19 | 2012-10-10 | 武汉钢铁(集团)公司 | Hot-galvanized high-strength steel with 220MPa-level yield strength and production method thereof |
| CN109440006A (en) * | 2018-11-22 | 2019-03-08 | 唐山钢铁集团有限责任公司 | A kind of automobile exterior panel baking hardened steel and its production method |
| US20190115126A1 (en) * | 2017-10-16 | 2019-04-18 | Iowa State University Research Foundation, Inc. | Feedstock and heterogeneous structure for tough rare earth permanent magnets and production process therefor |
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2020
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