CN114836695A - 180 MPa-grade non-leakage plating ultralow-carbon hot-dip galvanized steel strip and production method thereof - Google Patents
180 MPa-grade non-leakage plating ultralow-carbon hot-dip galvanized steel strip and production method thereof Download PDFInfo
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 32
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000007747 plating Methods 0.000 title claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 18
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000005246 galvanizing Methods 0.000 claims abstract description 9
- 238000010583 slow cooling Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000011068 loading method Methods 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 238000005554 pickling Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 238000005097 cold rolling Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 2
- 238000000034 method Methods 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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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
- 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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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
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- C21—METALLURGY OF IRON
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0226—Hot rolling
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- 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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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
The invention discloses a 180 MPa-grade non-plating-leakage ultra-low carbon hot-dip galvanized steel strip and a production method thereof, wherein the steel strip comprises the following chemical components in percentage by mass: less than or equal to 0.0035 percent, Si: less than or equal to 0.03 percent, Mn: 0.30% -0.50%, P: 0.03% -0.05%, S: less than or equal to 0.010 percent, Alt: 0.020% -0.060%, Ti: 0.02% -0.04%, Nb: 0.020% -0.035%, B: 0.0005% -0.0015%, N: less than or equal to 0.004 percent, and the balance of Fe, inevitable impurities and residual elements. The steel strip is obtained through the following steps, hot rolling is carried out, the heating time of a plate blank in a heating furnace is divided according to a furnace loading mode, a plate blank state and a furnace temperature state, the hot material is 140-260 min, the cold material is 170-280 min, the plate blank discharging temperature is divided according to the types of rolled steel, the temperature of high-strength ultra-low carbon steel is set to be 1180-1220 ℃, and the generation amount of iron oxide scales is reduced by controlling the plate blank discharging temperature; acid rolling, namely adopting three-section type turbulent acid washing, and controlling the temperature of acid liquor at 70-90 ℃; the pickling speed is 100 m/min-170 m/min; galvanizing, and continuously annealing, wherein the soaking temperature is set to be 810-830 ℃, the slow cooling temperature is 680-700 ℃, and the fast cooling temperature is 480-500 ℃.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a 180 MPa-level non-leakage plating ultralow-carbon hot-dip galvanized steel strip and a production method thereof.
Background
At present, high-strength ultra-low carbon hot-dip galvanized steel sheets are widely applied to industries such as automobiles, household electrical appliances and the like due to good appearance and corrosion resistance. With the continuous improvement of the surface quality of a hot-dip galvanized steel plate, customers have higher and higher requirements on the surface of the hot-dip galvanized steel plate, and skip plating is a common defect in the production of the hot-dip galvanized steel plate, which not only affects the product appearance, but also reduces the corrosion resistance of the steel plate, thereby affecting the service life of the product, so that the reduction of the skip plating defect is the key for improving the surface quality of the hot-dip galvanized substrate.
In "a hot-dip galvanized high-strength IF steel for 340MPa class car spare tire bottom plate and a preparation method thereof" with patent number CN 113528934A, 340MPa class hot-dip galvanized high-strength IF steel is obtained by adopting a low-silicon and high-manganese component system, but the surface requirement of no plating leakage of steel produced by the component system is not shown.
The patent No. CN 113106328A discloses a production method for obtaining 180 MPa-grade hot-galvanized high-strength IF steel by adopting a Nb + Ti composite component system, the silicon content and the curling temperature of the patent are higher, the atmosphere of an annealing furnace is not described, and the risk of plating leakage is increased.
The high-strength ultra-low carbon hot-dip galvanized steel is prepared by adding solid solution strengthening elements on the basis of ultra-low carbon steel, the produced steel plate has good formability and high strength, can meet the requirements of stamping of complex automobile parts and manufacturing of stamping parts with high strength, and the thickness of the automobile stamping parts can be properly reduced by using the steel plate so as to reduce the self weight of automobiles and carbon emission and obtain good economic benefits.
With the continuous improvement of the capability of producing high-quality automobiles in China, the automobile manufacturing industry in China puts forward higher requirements on the coating performance and the corrosion resistance of the surface quality of the automobiles and the surface quality of steel plates. Under the double pressure of carbon emission reduction and increasingly higher steel production cost competition, the total weight of the automobile is always developed towards light weight. With the proposal of light weight of automobiles, the reduction of the supply thickness and the improvement of the performance of a non-leakage plating high-strength ultra-low carbon hot-dip galvanized steel strip serving as an automobile substrate are trends of production and development, and higher requirements are put forward for the production of steel supply enterprises. How to provide a steel plate with stable strength, no plating leakage defect and good surface quality on the premise of reducing the cost is a common problem for steel supply enterprises.
Disclosure of Invention
The invention aims to provide a 180 MPa-grade non-leakage plating ultralow-carbon hot-dip galvanized steel strip and a production method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip comprises the following chemical components in percentage by mass: less than or equal to 0.0035 percent, Si: less than or equal to 0.03 percent, Mn: 0.30% -0.50%, P: 0.03% -0.05%, S: less than or equal to 0.010%, Alt: 0.020% -0.060%, Ti: 0.02% -0.04%, Nb: 0.020% -0.035%, B: 0.0005% -0.0015%, N: less than or equal to 0.004 percent, and the balance of Fe, inevitable impurities and residual elements.
A production method of 180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip comprises the following steps:
1) hot rolling, namely dividing the heating time of the plate blank in a heating furnace according to a furnace loading mode, a plate blank state and a furnace temperature state, dividing hot materials for 140-260 min and cooling materials for 170-280 min, dividing the plate blank discharging temperature according to various types of rolled steel, setting the temperature of high-strength ultra-low carbon steel to be 1180-1220 ℃, and reducing the generation amount of iron scale by controlling the plate blank discharging temperature;
2) acid rolling, namely adopting three-section type turbulent acid washing, and controlling the temperature of acid liquor at 70-90 ℃; the pickling speed is 100 m/min-170 m/min;
3) galvanizing, and continuously annealing, wherein the soaking temperature is set to 810-830 ℃, the slow cooling temperature is 680-700 ℃, and the fast cooling temperature is 480-500 ℃.
Specifically, the pressure of a descaling system in hot rolling is more than or equal to 25MPa, and descaling passes are not matched according to obvious scale on the surface.
Specifically, the finish rolling temperature in the hot rolling is 920 +/-15 ℃, the finish rolling is carried out in an austenite region, and a 100% uniform ferrite structure is obtained through rolling.
Specifically, the hot rolling medium coiling adopts high-temperature U-shaped coiling, the coiling temperature of the middle part is 700 +/-15 ℃, and the coiling temperature of the head and the tail is 730 +/-15 ℃.
Specifically, the acid rolling is carried out by adopting a five-frame six-roller rolling mill, and the total cold rolling reduction rate is 60-85%.
Specifically, the method comprises the following steps of preheating, heating, soaking section, slow cooling and fast cooling section dew point in an annealing furnace in the galvanizing process: at most-35 ℃, equilibrium section dew point: at most-25 ℃, furnace nose dew point: -10 ℃ to 0 ℃.
Specifically, the galvanized steel coil is subjected to leveling treatment, and the leveling elongation is set to be 1.0% +/-0.1%.
The invention has the following beneficial effects:
1) the 180 MPa-grade non-plating-leaking ultralow-carbon hot-dip galvanized coil produced by the method has high strength, good surface quality and better stamping performance, is not easy to have the problem of zinc layer falling off in the deep processing processes of blanking forming, stamping and the like of users, and meets the use characteristics of being used as a structural steel plate.
2) The 180 MPa-grade non-plating-leaking ultralow-carbon hot-dip galvanized steel strip produced by the method has the low-silicon high-manganese component design, the lower slab tapping temperature and the lower annealing furnace atmosphere design, so that the problem that the substrate wettability is poor due to the oxidation of the surface of the steel sheet at the post-annealing stage (fast cooling, slow cooling and furnace nose) in the furnace is reduced, and the plating leakage is caused due to the poor adhesion of a zinc layer and the substrate.
Drawings
FIG. 1 is a diagram of the golden phase of the present invention.
FIG. 2 is the second diagram of the golden phase of the present invention.
FIG. 3 is a surface topography of a steel strip.
FIG. 4 is a cross-sectional view of a zinc layer.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
A180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip and a production method thereof ensure that the galvanized products meet the steel plate with yield of more than or equal to 180MPa, tensile strength of more than or equal to 340MPa, no leakage plating defect and good product surface and performance by reasonably designing the chemical components of the products and the production processes of hot rolling, cold rolling and zinc plating.
A180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip adopts a low-carbon, low-silicon and high-manganese component system, and comprises the following main chemical components in percentage by mass: c: less than or equal to 0.0035 percent, Si: less than or equal to 0.03 percent, Mn: 0.30% -0.50%, P: 0.03-0.05%, S: less than or equal to 0.010 percent, Alt: 0.020% -0.060%, Ti: 0.02% -0.04%, Nb: 0.020% -0.035%, B: 0.0005% -0.0015%, N: less than or equal to 0.004 percent, and the balance of Fe, inevitable impurities and residual elements.
A production method of a non-skip-plating high-strength ultralow-carbon hot-dip galvanized steel strip specifically comprises the following steps:
1) hot rolling, wherein a 230mm thick plate blank is divided according to a furnace loading mode, a plate blank state and a furnace temperature state in a heating furnace, and a hot material: 140-260 min; cooling: 170-280 min; the tapping temperature of the plate blank is divided according to the types of rolled steel, the temperature of the high-strength ultra-low carbon steel is set to 1180-1220 ℃, and the generation amount of iron scale is reduced by controlling the tapping temperature of the plate blank; the pressure of the descaling system is more than or equal to 25MPa, and descaling passes are determined according to the situation, so that no obvious scale on the upper surface is ensured; the finish rolling temperature is 920 +/-15 ℃, the finish rolling is ensured to be rolled in an austenite region, and 100 percent of uniform ferrite structure can be obtained through the rolling process; the high-temperature U-shaped curling is adopted for curling, in order to reduce the load of a coiler and the occurrence of internal oxidation phenomenon and simultaneously consider the precipitation size of second phase particles, the middle coiling temperature is set to be 700 +/-15 ℃, and the head and tail curling temperature is set to be 730 +/-15 ℃.
2) Acid rolling, wherein three-section turbulent acid washing is adopted during acid rolling, and the temperature of the acid liquor is controlled to be 70-90 ℃; the pickling speed is 100 m/min-170 m/min; and (3) carrying out cold continuous rolling by adopting a five-frame six-roller rolling mill, wherein the total rolling reduction rate of cold rolling is 60-85%, and the rolling reduction rate model of each frame is automatically calculated.
3) Galvanizing, continuously annealing the steel strip after acid rolling, setting the soaking temperature to be 810-830 ℃, the slow cooling temperature to be 680-700 ℃ and the fast cooling temperature to be 480-500 ℃; because the furnace zone atmosphere has great influence on the surface wettability of the strip steel, the atmosphere in the annealing furnace is controlled, and the dew points of the preheating, heating, soaking section, slow cooling and fast cooling sections are as follows: at most-35 ℃, the dew point of the equilibrium section: at most-25 ℃, furnace nose dew point: -10 ℃ to 0 ℃; and (3) carrying out leveling treatment on the galvanized steel coil, wherein the leveling elongation is set to be 1.0 +/-0.1%.
The invention finally obtains the 180 MPa-level steel strip without surface plating leakage through reasonable chemical component design, hot rolling process and cold rolling process control, and the obtained hot-dip galvanized steel strip has the performance meeting the requirements and meets the actual use requirements of being used as a high-strength stamping steel plate.
Examples 1 to 3
In each example, molten steel having required chemical compositions was obtained by KR desulfurization, converter smelting and RH refining, and the specific compositions of each example are shown in table 1.
TABLE 1 Main chemical composition Table of molten steel in examples 1 to 3
The main process parameters of hot rolling of each example are shown in table 2.
TABLE 2 Hot Rolling parameters in examples 1-3
The specific acid rolling and temper rolling process parameters for each example are shown in table 3.
TABLE 3 parameters of the acid rolling process in examples 1-3
The specific annealing and galvanizing process parameters for each example are shown in table 4.
TABLE 4 annealing and galvanizing process parameters of examples 1-3
The 180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel product can be produced by controlling the process parameters, the product is sampled and analyzed, the performance result is shown in Table 5, and the microstructure is shown in figures 1-2.
| Yield strength/MPa | Tensile strength/MPa | Whether the surface is under plating or not | |
| The invention | 180～240 | 340～390 | Whether or not |
| Example 1 | 215 | 353 | Whether or not |
| Example 2 | 214 | 354 | Whether or not |
| Example 3 | 205 | 361 | Whether or not |
TABLE 5 Properties of the products of examples 1-3
The prepared steel strip is observed by a scanning electron microscope, and the effect graphs are shown in figures 3 and 4.
According to the invention, through the design of the main chemical components in percentage by mass of the 180 MPa-level non-leakage plating ultralow-carbon hot-dip galvanized steel strip, the silicon content is reduced on the basis of the traditional component design, and the influence of silicon on the surface quality of a zinc layer during hot-dip galvanizing is reduced.
The specific production process of the 180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip adopts the crimping temperature of 700 +/-15 ℃, reduces the load of a coiler and the phenomenon of internal oxidation, and simultaneously gives consideration to the precipitation size of second phase particles; the generation amount of iron scale is reduced by adopting lower plate blank tapping temperature (1200 +/-20 ℃); in addition, the lower annealing furnace atmosphere reduces the defect of plating leakage caused by the oxidation of the surface of the steel plate at the later annealing stage (fast cooling, slow cooling and furnace nose) in the furnace.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (8)
1. A180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip comprises the following chemical components in percentage by mass: less than or equal to 0.0035 percent, Si: less than or equal to 0.03 percent, Mn: 0.30% -0.50%, P: 0.03% -0.05%, S: less than or equal to 0.010 percent, Alt: 0.020% -0.060%, Ti: 0.02% -0.04%, Nb: 0.020% -0.035%, B: 0.0005% -0.0015%, N: less than or equal to 0.004 percent, and the balance of Fe, inevitable impurities and residual elements.
2. A production method of 180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip is characterized by comprising the following steps:
1) hot rolling, namely dividing the heating time of the plate blank in a heating furnace according to a furnace loading mode, a plate blank state and a furnace temperature state, dividing hot materials for 140-260 min and cooling materials for 170-280 min, dividing the plate blank discharging temperature according to various types of rolled steel, setting the temperature of high-strength ultra-low carbon steel to be 1180-1220 ℃, and reducing the generation amount of iron scale by controlling the plate blank discharging temperature;
2) acid rolling, namely adopting three-section type turbulent acid washing, and controlling the temperature of acid liquor at 70-90 ℃; the pickling speed is 100 m/min-170 m/min;
3) galvanizing, and continuously annealing, wherein the soaking temperature is set to 810-830 ℃, the slow cooling temperature is 680-700 ℃, and the fast cooling temperature is 480-500 ℃.
3. The production method of the 180 MPa-grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip as claimed in claim 2, characterized in that the pressure of a descaling system in hot rolling is more than or equal to 25MPa, and descaling passes are matched according to no obvious scale on the surface.
4. The method for producing the 180MPa grade non-leakage plating ultra-low carbon hot dip galvanized steel strip is characterized in that the finish rolling temperature in the hot rolling is 920 +/-15 ℃, the finish rolling is carried out in an austenite region, and a uniform ferrite structure with the concentration of 100% is obtained through rolling.
5. The method for producing the 180MPa grade non-leakage plating ultra-low carbon hot dip galvanized steel strip according to claim 2, characterized in that the hot rolling medium coil adopts high temperature U-shaped coil, the middle coil temperature is 700 +/-15 ℃, and the head and tail coil temperature is 730 +/-15 ℃.
6. The production method of the 180 MPa-grade non-leakage plating ultra-low carbon hot galvanized steel strip as claimed in claim 2, characterized in that the acid rolling is carried out by adopting a five-stand six-roller mill for cold continuous rolling, and the total cold rolling reduction rate is 60-85%.
7. The production method of the 180MPa grade non-leakage plating ultra-low carbon hot dip galvanized steel strip as claimed in claim 2, characterized in that the dew point of the preheating, heating, soaking, slow cooling and fast cooling sections in the annealing furnace in the galvanizing is as follows: at most-35 ℃, equilibrium section dew point: at most-25 ℃, furnace nose dew point: -10 ℃ to 0 ℃.
8. The method for producing 180MPa grade non-leakage plating ultra-low carbon hot-dip galvanized steel strip according to claim 2, characterized in that the galvanized steel strip is subjected to leveling treatment, and the leveling elongation is set to be 1.0% ± 0.1%.
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| CN202210589204.8A CN114836695A (en) | 2022-05-26 | 2022-05-26 | 180 MPa-grade non-leakage plating ultralow-carbon hot-dip galvanized steel strip and production method thereof |
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|---|---|---|---|---|
| JP2004232065A (en) * | 2003-01-31 | 2004-08-19 | Sumitomo Metal Ind Ltd | Hot dip galvanized steel sheet, and production method therefor |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High strength cold-rolled plate with excellent formability and production method thereof |
| CN110592492A (en) * | 2019-10-17 | 2019-12-20 | 山东钢铁集团日照有限公司 | Production method of ultra-deep drawing hot-dip galvanized steel for automobile roof |
| WO2020195012A1 (en) * | 2019-03-25 | 2020-10-01 | 日本製鉄株式会社 | Steel sheet for hot stamping use |
| CN114107806A (en) * | 2021-10-29 | 2022-03-01 | 马鞍山钢铁股份有限公司 | 450 MPa-grade hot-galvanized dual-phase steel with high work hardening rate and surface quality and production method thereof |
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- 2022-05-26 CN CN202210589204.8A patent/CN114836695A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004232065A (en) * | 2003-01-31 | 2004-08-19 | Sumitomo Metal Ind Ltd | Hot dip galvanized steel sheet, and production method therefor |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High strength cold-rolled plate with excellent formability and production method thereof |
| WO2020195012A1 (en) * | 2019-03-25 | 2020-10-01 | 日本製鉄株式会社 | Steel sheet for hot stamping use |
| CN110592492A (en) * | 2019-10-17 | 2019-12-20 | 山东钢铁集团日照有限公司 | Production method of ultra-deep drawing hot-dip galvanized steel for automobile roof |
| CN114107806A (en) * | 2021-10-29 | 2022-03-01 | 马鞍山钢铁股份有限公司 | 450 MPa-grade hot-galvanized dual-phase steel with high work hardening rate and surface quality and production method thereof |
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Application publication date: 20220802 |