CN116254487A - Vanadium-containing hot dip galvanized steel sheet and hot rolling method thereof - Google Patents
Vanadium-containing hot dip galvanized steel sheet and hot rolling method thereof Download PDFInfo
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- CN116254487A CN116254487A CN202310050211.5A CN202310050211A CN116254487A CN 116254487 A CN116254487 A CN 116254487A CN 202310050211 A CN202310050211 A CN 202310050211A CN 116254487 A CN116254487 A CN 116254487A
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 29
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 29
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 28
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005098 hot rolling Methods 0.000 title abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 238000005096 rolling process Methods 0.000 claims abstract description 42
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 2
- 238000002788 crimping Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 238000005452 bending Methods 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C21D2211/008—Martensite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a vanadium-containing hot dip galvanized steel sheet and a hot rolling method thereof, belonging to the technical field of steel rolling. The vanadium-containing hot dip galvanized steel sheet is characterized by comprising the following components: the weight percentages are as follows: c:0.16 to 0.18, si:0.35 to 0.45, mn:2.10 to 2.30, P:0 to 0.012, S:0 to 0.003, V:0.01 to 0.05, al:0.55 to 0.65, and the balance of Fe and unavoidable impurities. The vanadium-containing hot-dip galvanized steel sheet and the hot rolling method thereof adopted by the invention have the advantages that the obtained product has better mechanical property, greatly improved yield strength, tensile strength and elongation, and good social and economic benefits.
Description
Technical Field
The invention relates to a vanadium-containing hot dip galvanized steel sheet and a hot rolling method thereof, belonging to the technical field of steel rolling.
Background
The hot stamping forming steel plate is a low alloy steel plate with a microstructure mainly in a single martensite phase by adding/adding elements such as manganese, silicon, vanadium and the like into C-Mn steel to improve the hardenability, and under the conditions of hot stamping and partial quenching, ferrite and bainite transformation is restrained so that the formed part microstructure mainly is pearlite and ferrite, the yield strength is 300-500 MPa, and the tensile strength is 600-700 MPa; after hot stamping forming, the tensile strength can reach more than 800MPa, and the safety of the material is obviously improved. Compared with the traditional HSLA steel types, the weight reduction can reach 50 percent.
In the production process of the steel for hot forming, chemical components, finishing temperature, coiling temperature, soaking temperature, leveling amount and the like have important influences on microstructure and mechanical properties of the steel for hot forming. Thus, precise control of chemical composition and process parameters is one of the key factors in achieving excellent performance of the steel for hot forming.
CN115386806a discloses a method for producing a hot dip galvanized steel sheet suitable for high-speed continuous stamping and a hot dip galvanized steel sheet, the method comprises the following specific steps: the steel plate comprises the following components in percentage by weight: c: greater than zero and less than or equal to 0.0030 percent, si: greater than zero and less than or equal to 0.02%, mn: 0.040-0.080%, P: greater than zero and less than or equal to 0.012 percent, S: greater than zero and less than or equal to 0.010%, ti: 0.040-0.090%, als: 0.010-0.070 percent, and the balance of Fe and unavoidable impurities, and continuously casting a steel plate into a continuous casting blank; a hot rolling process of sequentially performing rough rolling and finish rolling after heating the continuous casting billet to obtain a hot rolled plate; cooling and coiling the hot-rolled plate to obtain a hot-rolled steel coil, and cold-rolling the hot-rolled steel coil into cold-rolled thin strip steel after alkali washing; and (3) carrying out continuous hot galvanizing annealing, withdrawal straightening and finishing on the thin strip steel to obtain a product. The method has the following defects: the obtained hot dip galvanized steel sheet is improved compared with the prior products and is suitable for high-speed continuous stamping, but the mechanical property of the hot dip galvanized steel sheet is 140-170 MPa, the tensile strength is 290-310 MPa, the elongation is more than or equal to 47.0%, and the hot dip galvanized steel sheet cannot be suitable for industrial application with higher strength.
Disclosure of Invention
The first technical problem solved by the invention is to provide a vanadium-containing hot dip galvanized steel sheet.
A vanadium-containing hot dip galvanized steel sheet, characterized in that: the vanadium-containing hot dip galvanized steel sheet comprises the following components in percentage by weight: c:0.16 to 0.18, si:0.35 to 0.45, mn:2.10 to 2.30, P:0 to 0.012, S:0 to 0.003, V:0.01 to 0.05, al:0.55 to 0.65, and the balance of Fe and unavoidable impurities.
Preferably, the vanadium-containing hot dip galvanized steel sheet comprises the following components in percentage by weight: c:0.165 to 0.175, si:0.37 to 0.42, mn:2.15 to 2.25, P:0 to 0.008, S:0 to 0.002, V:0.03 to 0.045, al:0.58 to 0.62, and the balance of Fe and unavoidable impurities.
The second technical problem solved by the invention is to provide a preparation method of a vanadium-containing hot dip galvanized steel sheet, which comprises the following steps:
a. casting a slab;
b. heating: the tapping temperature is 1180-1250 ℃, and the heating time is 50-70 min;
c. descaling with high-pressure water;
d. rough rolling;
e. coiling a hot coiling box:
f. finish rolling: the initial rolling temperature is 1050-1080 ℃, and the final rolling temperature is 790-820 ℃;
g. and (3) cooling: adopting a two-stage cooling mode, wherein the cooling speed of the front stage is 30-40 ℃/s, and the cooling speed of the rear stage is 5-15 ℃/s; the front section is cooled to 680 ℃ to 730 ℃, and the rear section is cooled to 610 ℃ to 650 ℃;
h. and (3) coiling: the crimping temperature is 610-650 ℃.
In the step d, rough rolling is carried out to obtain an intermediate blank, the thickness of the intermediate blank obtained after rough rolling of a 200mm thick billet fluctuates within the range of 30-34 mm according to the difference of the thickness of a finished product, and then hot rolling box coiling is carried out on the intermediate blank, so that head-tail exchange of the intermediate blank is realized in the hot rolling box, and the uniform temperature of the through length of the billet is ensured; and meanwhile, removing the secondary oxidized iron sheet to ensure the smooth surface of the billet. The hot box may be, for example, a coreless transfer hot box. The intermediate blank is coiled by a hot coil box and then is shifted and uncoiled, enters a finish rolling area for finish rolling, and is subjected to finish rolling by a 6-frame finishing mill, wherein the thickness of the intermediate blank is 40-30 mm, 30-22 mm, 22-16 mm, 16-11 mm, 11-7 mm and 7-5 mm in sequence after each pass of rolling.
Preferably, in the step g, the front stage is cooled to 700 ℃ to 710 ℃ and the rear stage is cooled to 620 ℃ to 640 ℃.
The third technical problem to be solved by the invention is to provide the application of the vanadium-containing hot dip galvanized steel sheet to high-strength steel for automobiles.
The invention has the beneficial effects that:
1. according to the vanadium-containing hot-dip galvanized steel sheet and the hot rolling method thereof, the V, ti microalloy steel with the climbing steel characteristic is subjected to hot rolling treatment, and the 800 MPa-grade high-strength steel can be obtained by adopting the existing equipment and reducing parameters such as hot rolling tapping temperature, finish rolling inlet temperature, finish rolling temperature, coiling temperature and the like.
2. According to the vanadium-containing hot-dip galvanized steel sheet and the hot rolling method thereof, nano carbide strengthening, fine grain strengthening and martensite strengthening for improving toughness are realized through higher C, V, mn, and meanwhile, the steel contains higher aluminum, so that the steel strength can be obviously improved, the surface galvanization performance of the steel is improved, and the method has good social and economic benefits.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The examples were conducted under conventional conditions, except that the specific conditions were not specified.
Example 1
Casting blast furnace molten iron to obtain a steel billet, and heating, descaling by high-pressure water, rough rolling, coiling by a hot coil box, finish rolling, cooling, coiling and the like to obtain the steel plate. Wherein, the content of the steel billet components (based on the total weight of the steel) is as follows: c:0.17, si:0.4, mn:2.2, P:0.004, S:0.001, V:0.04, al:0.60, the balance being Fe and unavoidable impurities. The heating temperature of the billet in the heating furnace is 1210 ℃, the heating time is 60 minutes, the initial rolling temperature is 1065 ℃, the final rolling temperature is 805 ℃, the cooling speed of the front stage is 35 ℃/s, the cooling speed of the rear stage is 10 ℃/s, the cooling speed of the rear stage is 630 ℃, the coiling temperature is 630 ℃, and the thickness of the hot rolled product is 2.5mm. And the prepared coil is subjected to mechanical property detection, the yield strength of a finished product is 490MPa, the tensile strength is 840MPa, the elongation is 22%, the cold bending performance is good, the welding performance of the steel plate is good, and the technical condition requirements are completely met.
Example 2
Casting blast furnace molten iron to obtain a steel billet, and heating, descaling by high-pressure water, rough rolling, coiling by a hot coil box, finish rolling, cooling, coiling and the like to obtain the steel plate. Wherein, the content of the steel billet components (based on the total weight of the steel) is as follows: c:0.16, si:0.36, mn:2.15, P:0.007, S:0.0035, V:0.023, al:0.56, the balance being Fe and unavoidable impurities. The heating temperature of the billet in the heating furnace is 1180 ℃, the heating time is 50 minutes, the initial rolling temperature is 1055 ℃, the final rolling temperature is 795 ℃, the cooling speed of the front section is 30 ℃/s during cooling to 685 ℃, the cooling speed of the rear section is 5 ℃/s, the cooling to 610 ℃, the coiling temperature is 610 ℃, and the thickness of the hot rolled product is 2.5mm. And the prepared coil is subjected to mechanical property detection, the yield strength of a finished product is 460MPa, the tensile strength is 800MPa, the elongation is 20%, the cold bending performance is good, the welding performance of the steel plate is good, and the technical condition requirements are completely met.
Example 3
Casting blast furnace molten iron to obtain a steel billet, and heating, descaling by high-pressure water, rough rolling, coiling by a hot coil box, finish rolling, cooling, coiling and the like to obtain the steel plate. Wherein, the content of the steel billet components (based on the total weight of the steel) is as follows: c:0.18, si:0.45, mn:2.30, P:0.012, S:0.003, V:0.05, al:0.65, the balance being Fe and unavoidable impurities. The heating temperature of the billet in the heating furnace is 1245 ℃, the heating time is 70 minutes, the initial rolling temperature is 1080 ℃, the final rolling temperature is 820 ℃, the cooling speed of the front stage is 40 ℃/s, the cooling is carried out to 710 ℃, the cooling speed of the rear stage is 9 ℃/s, the cooling is carried out to 640 ℃, the coiling temperature is 640 ℃, and the thickness of the hot rolled product is 2.0mm. And the prepared coil is subjected to mechanical property detection, the yield strength of a finished product is 550MPa, the tensile strength is 890MPa, the elongation is 22%, the cold bending performance is good, the welding performance of the steel plate is good, and the technical condition requirements are completely met.
Comparative example 1
Casting blast furnace molten iron to obtain a steel billet, and heating, descaling by high-pressure water, rough rolling, coiling by a hot coil box, finish rolling, cooling, coiling and the like to obtain the steel plate. The billet composition was exactly the same as in example 1. The heating temperature of the billet in the heating furnace is 1200 ℃, the heating time is 100 minutes, the initial rolling temperature is 1180 ℃, the final rolling temperature is 1010 ℃, the billet is cooled to 720 ℃ at one time, the coiling temperature is 830 ℃, and the thickness of a hot rolled finished product is 6.0mm. And (3) detecting the mechanical properties of the prepared coiled sheet, wherein the yield strength of the finished product is 210MPa, the tensile strength is 330MPa, the elongation is 25%, and the mechanical properties of the coiled sheet do not meet the technical condition requirements.
The tail of the steel coil of the hot continuous rolled steel sheet for cold forming was sampled, and the yield strength (ReL), tensile strength (Rm) and elongation (%) were measured according to the method specified in GB/T228, and cold bending properties (b=35, α=180°, d=a; d represents the core diameter, a represents the bending angle, and B represents the width of the sample) were measured according to the method specified in GB/T232, and the measurement results are shown in table 1.
TABLE 1
| Group of | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Cold bending property |
| Example 1 | 490 | 840 | 22.0 | Qualified product |
| Example 2 | 460 | 800 | 20.0 | Qualified product |
| Example 3 | 550 | 890 | 22.0 | Qualified product |
| Comparative example | 210 | 330 | 25.0 | Failure to pass |
| GB/T700-2006 | ≥375 | 370～500 | ≥26.0 | / |
According to the vanadium-containing hot-dip galvanized steel sheet and the hot rolling method thereof, nano carbide strengthening and fine grain strengthening are realized through higher C, V, mn, and toughness-improving martensite strengthening is improved, meanwhile, the steel contains higher aluminum, so that the steel strength can be obviously improved, the surface galvanization performance of the steel can be improved, and the hot-rolled steel sheet with yield strength more than or equal to 235Mpa, tensile strength 370-500 Mpa, elongation after break more than or equal to 26% and mechanical performance completely conforming to national standards is obtained by controlling billet components, tapping temperature, heating time, start rolling and finish rolling temperature, cooling temperature, curling temperature and the like.
The present embodiment is merely illustrative of the invention and not intended to be limiting, and those skilled in the art will make modifications or improvements on the basis of the present invention after reading the description of the invention, but are protected by the patent laws within the scope of the claims of the present invention.
Claims (7)
1. The vanadium-containing hot dip galvanized steel sheet is characterized in that: the vanadium-containing hot dip galvanized steel sheet comprises the following components in percentage by weight: c:0.16 to 0.18, si:0.35 to 0.45, mn:2.10 to 2.30, P:0 to 0.012, S:0 to 0.003, V:0.01 to 0.05, al:0.55 to 0.65, and the balance of Fe and unavoidable impurities.
2. The vanadium-containing hot-dip galvanized steel sheet according to claim 1, characterized in that: the vanadium-containing hot dip galvanized steel sheet comprises the following components in percentage by weight: c:0.165 to 0.175, si:0.37 to 0.42, mn:2.15 to 2.25, P:0 to 0.008, S:0 to 0.002, V:0.03 to 0.045, al:0.58 to 0.62, and the balance of Fe and unavoidable impurities.
3. A method for preparing the vanadium-containing hot dip galvanized steel sheet as set forth in claim 1 or 2, characterized by comprising the steps of:
a. casting a slab;
b. heating: the tapping temperature is 1180-1250 ℃, and the heating time is 50-70 min;
c. descaling with high-pressure water;
d. rough rolling;
e. coiling a hot coiling box:
f. finish rolling: the initial rolling temperature is 1050-1080 ℃, and the final rolling temperature is 790-820 ℃;
g. and (3) cooling: adopting a two-stage cooling mode, wherein the cooling speed of the front stage is 30-40 ℃/s, and the cooling speed of the rear stage is 5-15 ℃/s; the front section is cooled to 680 ℃ to 730 ℃, and the rear section is cooled to 610 ℃ to 650 ℃;
h. and (3) coiling: the crimping temperature is 610-650 ℃.
4. A method of producing a vanadium containing hot dip galvanized steel sheet according to claim 3, characterized in that: and d, rough rolling to obtain an intermediate blank, wherein the thickness of the intermediate blank obtained by rough rolling of a billet with the thickness of 200mm is 30-34 mm according to the difference of the thickness of a finished product.
5. A method of producing a vanadium containing hot dip galvanized steel sheet according to claim 3, characterized in that: and f, adopting a 6-frame finishing mill for finish rolling, wherein the thickness of the intermediate blank is 40-30 mm, 30-22 mm, 22-16 mm, 16-11 mm, 11-7 mm and 7-5 mm in sequence after each pass of rolling.
6. A method of producing a vanadium containing hot dip galvanized steel sheet according to claim 3, characterized in that: in the step g, the front section is cooled to 700-710 ℃ and the rear section is cooled to 620-640 ℃.
7. Use of the vanadium-containing hot dip galvanized steel sheet as set forth in claim 1 or 2 for automotive high strength steel.
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