CN114959491B - 350MPa grade high corrosion-resistant coated steel sheet produced by short process and method - Google Patents
350MPa grade high corrosion-resistant coated steel sheet produced by short process and method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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Abstract
A350 MPa grade high corrosion resistant coated steel sheet produced by adopting a short process comprises the following components in percentage by weight: c: 0.040-0.069%, si:0.15 to 0.25 percent, mn:0.60 to 0.80 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.012 percent, als:0.012 to 0.080 percent, N is not more than 0.010 percent: the production method comprises the following steps: desulfurizing molten iron; smelting and refining by a conventional electric furnace or converter; continuous casting; descaling in front of a soaking pit; soaking the casting blank; descaling before entering a rolling mill; finish rolling; laminar cooling to coiling temperature and coiling; naturally cooling; cold rolling after conventional pickling; continuous hot dip plating; after packaging, the product is directly sent to a user, or the surface of the strip steel is coated for later use. The mechanical properties of the invention: the yield strength is 350-400 MPa, the tensile strength is 445-475 MPa, the elongation A is not less than 20%, the 1000h neutral salt spray test does not foam, has no rust corrosion phenomenon, has simple components, and has great significance for improving the service performance of industries such as social resource conservation, construction, household appliances and the like.
Description
Technical Field
The invention relates to a high-strength high-corrosion-resistance coated steel plate, in particular to a short-process 350 MPa-grade high-strength high-corrosion-resistance coated steel plate and a production method thereof, wherein the yield strength of the high-strength high-corrosion-resistance coated steel plate is 350-450 MPa, the tensile strength is 420-520 MPa, the elongation is more than or equal to 16%, and the thickness specification of the steel plate is 0.35-0.90 mm.
Background
With the improvement of society, the living standard of people is improved, the industrialization process is continuously developed, natural resources are gradually deficient, and the global requirements for steel products with different application scenes are raised, for example, the industries of building, household appliances, automobiles and the like are provided with severe requirements for the used products, such as green, economy, high performance, high durability and the like.
The prior art and the product adopt low alloy steel with long flow and niobium and titanium, and the process flow is long, and the cost, the energy consumption and the carbon emission are high.
And (3) searching:
the document of Chinese patent publication No. CN 110607476A discloses a method for manufacturing cold-rolled hot-dip galvanized high-strength structural steel with yield strength of 350 MPa. The invention aims to solve the problems of continuous casting surface crack defect of steel, large production load of a rolling mill, low yield ratio, serious center segregation, low alloy cost, low market competitiveness and the like. The main components of the composition by weight percent are: c:0.10 to 0.18 percent, si is less than or equal to 0.03 percent, mn:0.15 to 0.40 percent, P:0.060 to 0.075 percent, S: less than or equal to 0.008 percent, als:0.015 to 0.040 percent, ti: 0.045-0.080%, N is less than or equal to 0.0040%, si+P is less than or equal to 0.090%, mn/S is more than or equal to 20. The process route and the process are as follows: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF molten steel refining treatment, slab continuous casting (casting blank drawing speed is 1.10-1.50 m/min), hot continuous rolling (casting blank heating temperature is 1250-1280 ℃, rough rolling outlet temperature is 1050-1090 ℃, finish rolling outlet temperature is 850-880 ℃ and coiling temperature is 580-620 ℃), pickling, cold continuous rolling, annealing hot dip galvanizing, finishing and drawing (finishing elongation is 1.0-1.6 percent and drawing elongation is 0.4-1.0 percent). The yield strength of the obtained steel plate is 370-460 MPa, the tensile strength is 470-540 MPa, and the elongation A 80mm 28 to 34 percent. The method solves the problems of casting blank cracks, rolling mill production load, center segregation and the like, but has the advantages of long process flow, slow casting blank drawing speed, high casting blank heating temperature, high alloy content and poor corrosion resistance.
The document of Chinese patent publication No. CN 105238999B discloses a 350MPa thick-specification hot-dip galvanized steel and a production method thereof. The main components of the composition by weight percent are: c:0.07 to 0.10 percent, si:0 to 0.03 percent, mn:0.4 to 0.8 percent, P: <0.015%, S: <0.012%, al:0.04 to 0.06 percent, nb:0.03 to 0.05 percent. Sequentially carrying out smelting, casting, hot rolling, pickling cold continuous rolling, hot galvanizing, leveling and withdrawal straightening. The thick zinc layer hot dip galvanized steel with the thickness of 2.5-3.0mm, excellent bending forming performance, the plating layer weight of 275g/m < 2 > and the surface quality and performance uniformity of the thick zinc layer, and the production method thereof are provided. The method also adopts a long-flow and niobium-containing component design, and mainly produces products with the thickness of 2.5-3.0mm, and has the advantages of high cost, high emission and poor corrosion resistance.
Disclosure of Invention
The invention aims to overcome the defects of long process flow, high temperature of the process flow, high energy consumption and low corrosion resistance of products in the prior art, and provides a 350 MPa-grade high-corrosion-resistance coated steel sheet and a method which are used for ensuring the yield strength of a steel belt to be 350MPa, meeting the requirements of industries such as buildings, steel structures and the like, and having excellent corrosion resistance and are produced by adopting a short process flow.
Measures for achieving the above object:
a350 MPa grade high corrosion resistant coated steel sheet produced by adopting a short process comprises the following components in percentage by weight: c: 0.040-0.069%, si:0.15 to 0.25 percent, mn:0.60 to 0.80 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.012 percent, als:0.012 to 0.080 percent, N is not more than 0.010 percent, and the balance is Fe and unavoidable impurities.
Preferably: the weight percentage content of Als is 0.018-0.073%.
A method for producing a 350MPa grade high corrosion resistant coated steel sheet produced by a short process comprises the following steps:
1) Desulfurizing molten iron, and controlling S to be less than or equal to 0.003% when the desulfurization is finished;
2) Smelting and refining by a conventional electric furnace or converter;
3) Continuous casting is carried out, the superheat degree of the ladle molten steel is controlled to be 15-35 ℃, the thickness of a casting blank is controlled to be 50-70 mm, and the blank drawing speed is controlled to be 4.5 to the ultra-high
6.0m/min；
4) Descaling the casting blank before entering a soaking pit, and controlling the pressure of descaling water to be not lower than 220bar;
5) Soaking the casting blank, and controlling the tapping temperature to be 1120-1160 ℃;
6) High-pressure water descaling before entering a rolling mill, and controlling the pressure of the descaling water to be more than or equal to 260bar;
7) Performing finish rolling, and controlling the thickness of the outlet of the steel plate to be 1.8-4.5 mm after rolling is finished; meanwhile: controlling the first pass reduction rate and the second pass reduction rate to be not lower than 50%; controlling the final rolling temperature to be 840-880 ℃;
8) Cooling laminar flow to coiling temperature, coiling, and controlling the coiling temperature to be 520-560 ℃;
9) Naturally cooling the steel coil to not more than 70 ℃;
10 Cold rolling after conventional acid washing, controlling the cold rolling reduction to be 75-80%, and controlling the thickness of a rolling outlet to be 0.35-1.2 mm;
11 High corrosion resistant coating continuous hot dip coating:
A. firstly heating the strip steel to 610-660 ℃, then heating the strip steel to 690-750 ℃ within 10-20 s, and soaking;
B. rapidly cooling to 610-640 ℃ at a cooling speed of 3-12 ℃/s; slowly cooling to 585-605 ℃ at a cooling speed of 2-10 ℃/s;
C. carrying out continuous hot dip plating on the strip steel, and controlling the temperature of the plating solution to be 580-595 ℃;
D. after the galvanization is finished, the galvanized steel is passed through an air knife, the height of the air knife is controlled to be 200-260 mm, the distance between the air knife and the galvanized steel is 4-8 mm, and the pressure of the air knife is 40-80 mbar;
E. cooling, namely cooling the strip steel to not more than 200 ℃ at a cooling speed of 6-10 ℃/s after the air knife is discharged;
F. surface finishing is carried out on the strip steel, and the finishing rolling reduction rate is controlled to be 0.6-0.9%;
12 After continuous hot dip plating, the strip steel is packaged and then directly sent to a user, or the surface of the strip steel is coated;
and (5) coating for later use.
Further: the coating treatment procedure:
cleaning the surface of the strip steel subjected to continuous hot dip plating; then, coating an organic layer or an inorganic coating on the surface of the strip steel twice; and then coating and curing the organic layer or the inorganic coating, and controlling the curing temperature to be 250-310 ℃.
The function and mechanism of each metal element and main process in the invention
C: carbon is a interstitial solid solution element, which has a good effect on the strength improvement of steel. However, for a short-flow production line, the casting difficulty of peritectic steel is high, when the carbon content reaches 0.070% or more, the peritectic steel enters a peritectic zone, and the steel leakage problem is easy to occur during casting. Therefore, the content is limited to a range of 0.040 to 0.069%.
Si: silicon has a strong solid solution strengthening effect and can improve the strength of steel, but high silicon content can deteriorate the performance of hot-dip high corrosion-resistant plating. Therefore, the content is limited to a range of 0.15 to 0.25%.
Mn: manganese has a solid solution strengthening effect and can ensure that the steel has higher strength, so the content of the manganese is limited to be in the range of 0.60-0.80 percent.
Als plays a deoxidizing role in steel, a certain amount of acid-soluble aluminum in the steel is ensured, otherwise, the effect cannot be exerted, but excessive aluminum also can cause aluminum series inclusion in the steel, and particularly for a short-flow production line, the problem of nozzle blockage is extremely easy to occur due to the small nozzle of a continuous casting crystallizer and high aluminum content. Meanwhile, the right amount of aluminum is added into the steel, so that adverse effects of nitrogen and oxygen atoms in the steel on performance can be eliminated. Therefore, the content thereof is limited to a range of 0.012 to 0.080%, and the content of Als is preferably 0.018 to 0.073%.
P: phosphorus is a harmful element in steel, and is easy to cause center segregation of casting blanks. Especially, the sheet casting blank is easy to be biased to grain boundaries in the subsequent hot continuous rolling heating process after segregation, so that the brittleness of steel is obviously increased. Meanwhile, the content of the alloy is controlled below 0.025% based on cost consideration and without affecting the performance of the steel.
S: sulfur is a very harmful element. Sulfur in steel is often present in the form of manganese sulfides, which inclusions deteriorate the toughness of the steel and cause anisotropy of properties, and therefore, it is necessary to control the sulfur content of the steel to be as low as possible. The sulfur content in the steel is controlled below 0.010% based on manufacturing cost considerations.
N: nitrogen is a interstitial solid solution atom which is easily combined with aluminum in steel to form aluminum nitride fine precipitates, which act to refine grains, but a high nitrogen content deteriorates the properties of steel, particularly aging properties. Therefore, the nitrogen content in the steel is controlled below 0.010%.
The invention controls the superheat degree of the ladle molten steel at 15-35 ℃, the thickness of a casting blank at 50-70 mm and the blank drawing speed at 4.5-6.0 m/min, and the problems of surface defects of the casting blank in the continuous casting process, steel leakage in the casting process and the like are caused by high superheat degree of the molten steel or low superheat degree of the molten steel; the thin casting blank thickness and high drawing speed can obtain fine casting blank tissue, and the guarantee is provided for the subsequent tissue of essential fine grain.
The tapping temperature of the casting blank is controlled to be 1120-1160 ℃, and the tapping temperature lower than 1120 ℃ cannot ensure that the inventive steel is rolled in a single-phase austenite region, and the tapping temperature higher than 1160 ℃ can cause overhigh temperature of the casting blank, thicken surface oxide scales and is not beneficial to control of surface quality.
The invention controls the first and second pass reduction rate to be not less than 50%; the final rolling temperature is 840-880 ℃, and the columnar crystals can be effectively crushed by controlling the rolling reduction of the first pass and the second pass to be not lower than 50 percent, so that the strip steel can be dynamically or statically recrystallized in the deformation process and after the first pass and before the second pass, and the recrystallization process can be completed. And then controlling the reduction rate to be not lower than 50% in the second pass, crushing a part of austenite after the first pass recrystallization, then recrystallizing to further refine grains, accumulating a large amount of deformation bands in the other part of austenite grains, and increasing nucleation sites in the subsequent phase transformation process.
The coiling temperature of the invention is 520-560 ℃, and the fine hot rolled structure can be obtained by controlling the coiling temperature.
The invention controls the natural cooling of the steel coil to not more than 70 ℃ because of the convenience of subsequent transportation.
The cold rolling reduction rate is controlled to be 75-80%, and the recrystallization structure is obtained at a lower temperature because the cold rolling reduction rate can be matched with the subsequent annealing temperature.
The invention comprises the following steps in the continuous hot dip plating:
A. firstly heating the strip steel to 610-660 ℃, then heating the strip steel to 690-750 ℃ within 10-20 s, and soaking;
B. rapidly cooling to 610-640 ℃ at a cooling speed of 3-12 ℃/s; slowly cooling to 585-605 ℃ at a cooling speed of 2-10 ℃/s;
C. carrying out continuous hot dip plating on the strip steel, and controlling the temperature of the plating solution to be 580-595 ℃;
D. after the galvanization is finished, the galvanized steel is passed through an air knife, the height of the air knife is controlled to be 200-260 mm, the distance between the air knife and the galvanized steel is 4-8 mm, and the pressure of the air knife is 40-80 mbar;
E. cooling, namely cooling the strip steel to not more than 200 ℃ at a cooling speed of 6-10 ℃/s after the air knife is discharged;
F. the surface of the strip steel is polished, and the polishing elongation is controlled to be 0.6-0.9%, so that the polishing elongation can ensure that the strip steel obtains a good polishing surface and the plate shape.
Compared with the prior art, the invention ensures that the yield strength of the steel belt is 350-400 MPa, the tensile strength is 445-475 MPa, the elongation A is not less than 20%, the 1000h neutral salt spray test does not foam, the corrosion phenomenon is avoided, the environment-friendly, economical and high-durability use requirements of industries such as buildings, household appliances and the like can be met, the components are simple, the corrosion resistance is excellent, and the invention has great significance for social resource conservation, and service performance improvement of industries such as buildings, household appliances and the like.
Drawings
FIG. 1 is a metallographic structure diagram of the present invention.
Detailed Description
The present invention will be described in detail below:
table 1 is a listing of chemical components of each example and comparative example of the present invention;
table 2 is a list of the main process parameters for each example and comparative example of the present invention;
table 3 shows a list of performance tests for each example and comparative example of the present invention.
The embodiments of the invention were produced according to the following steps
1) Desulfurizing molten iron, and controlling S to be less than or equal to 0.003% when the desulfurization is finished;
2) Smelting and refining by a conventional electric furnace or converter;
3) Continuous casting is carried out, the superheat degree of the ladle molten steel is controlled to be 15-35 ℃, the thickness of a casting blank is controlled to be 50-70 mm, and the blank pulling speed is controlled to be 4.5-6.0 m/min;
4) Descaling the casting blank before entering a soaking pit, and controlling the pressure of descaling water to be not lower than 220bar;
5) Soaking the casting blank, and controlling the tapping temperature to be 1120-1160 ℃;
6) High-pressure water descaling before entering a rolling mill, and controlling the pressure of the descaling water to be more than or equal to 260bar;
7) Performing finish rolling, and controlling the thickness of the outlet of the steel plate to be 1.8-4.5 mm after rolling is finished; meanwhile: controlling the reduction rate of the first pass and the second pass to be not lower than 50%; controlling the final rolling temperature to be 840-880 ℃;
8) Cooling laminar flow to coiling temperature, coiling, and controlling the coiling temperature to be 520-560 ℃;
9) Naturally cooling the steel coil to not more than 70 ℃;
10 Cold rolling after conventional acid washing, controlling the cold rolling reduction to be 75-80%, and controlling the thickness of a rolling outlet to be 0.35-1.2 mm;
11 High corrosion resistant coating continuous hot dip coating:
A. firstly heating the strip steel to 610-660 ℃, then heating the strip steel to 690-750 ℃ within 10-20 s, and soaking;
B. rapidly cooling to 610-640 ℃ at a cooling speed of 3-12 ℃/s; slowly cooling to 585-605 ℃ at a cooling speed of 2-10 ℃/s;
C. carrying out continuous hot dip plating on the strip steel, and controlling the temperature of the plating solution to be 580-595 ℃;
D. after the galvanization is finished, the galvanized steel is passed through an air knife, the height of the air knife is controlled to be 200-260 mm, the distance between the air knife and the galvanized steel is 4-8 mm, and the pressure of the air knife is 40-80 mbar;
E. cooling, namely cooling the strip steel to not more than 200 ℃ at a cooling speed of 6-10 ℃/s after the air knife is discharged;
F. surface finishing is carried out on the strip steel, and the finishing rolling reduction rate is controlled to be 0.6-0.9%;
12 After continuous hot dip plating, the strip steel is packaged and then directly sent to a user, or the surface of the strip steel is coated;
and (5) coating for later use.
Table 1 chemical composition (wt.%) of each example and comparative example of the present invention
Table 2 list of values of the main process parameters for each example and comparative example of the present invention
Continuous table 2
TABLE 3 list of mechanical Properties of examples and comparative examples according to the invention
In conclusion, the invention successfully realizes that the steel has higher strength, good economical efficiency, high durability and other characteristics through the matching design of the low-cost component design, the short-flow process and the hot-dip high corrosion-resistant coating hot-dip process, meets the green, economical and high-durability use requirements of industries such as buildings, household appliances and the like, and has great significance for saving social resources and improving the service performance of industries such as buildings, household appliances and the like.
This embodiment is merely a best example and is not intended to limit the implementation of the technical solution of the present invention.
Claims (2)
1. A production method of a 350MPa grade high corrosion resistant coated steel sheet produced by adopting a short process comprises the following steps:
1) Desulfurizing molten iron, and controlling S to be less than or equal to 0.003% when the desulfurization is finished;
2) Smelting and refining by a conventional electric furnace or converter;
3) Continuous casting is carried out, the superheat degree of the ladle molten steel is controlled to be 15-35 ℃, the thickness of a casting blank is controlled to be 50-70 mm, and the blank pulling speed is controlled to be 4.5-6.0 m/min;
4) Descaling the casting blank before entering a soaking pit, and controlling the pressure of descaling water to be not lower than 220bar;
5) Soaking the casting blank, and controlling the tapping temperature to be 1120-1160 ℃;
6) High-pressure water descaling before entering a rolling mill, and controlling the pressure of the descaling water to be more than or equal to 260bar;
7) Performing finish rolling, and controlling the thickness of the outlet of the steel plate to be 1.8-4.5 mm after rolling is finished; meanwhile: controlling the reduction rate of the first pass and the second pass to be not lower than 50%; controlling the final rolling temperature to be 840-880 ℃;
8) Cooling laminar flow to coiling temperature, coiling, and controlling the coiling temperature to be 520-560 ℃;
9) Naturally cooling the steel coil to not more than 70 ℃;
10 Cold rolling after conventional acid washing, controlling the cold rolling reduction to be 75-80%, and controlling the thickness of a rolling outlet to be 0.35-1.2 mm;
11 High corrosion resistant coating continuous hot dip coating:
A. firstly heating the strip steel to 610-660 ℃, then heating the strip steel to 690-750 ℃ within 10-20 s, and soaking;
B. rapidly cooling to 610-640 ℃ at a cooling speed of 3-12 ℃/s; slowly cooling to 585-605 ℃ at a cooling speed of 2-10 ℃/s;
C. carrying out continuous hot dip plating on the strip steel, and controlling the temperature of the plating solution to be 580-595 ℃;
D. after the galvanization is finished, the galvanized steel is passed through an air knife, the height of the air knife is controlled to be 200-260 mm, the distance between the air knife and the galvanized steel is 4-8 mm, and the pressure of the air knife is 40-80 mbar;
E. cooling, namely cooling the strip steel to not more than 200 ℃ at a cooling speed of 6-10 ℃/s after the air knife is discharged;
F. surface finishing is carried out on the strip steel, and the finishing rolling reduction rate is controlled to be 0.6-0.9%;
12 After continuous hot dip plating, the strip steel is packaged and then directly sent to a user, or the surface of the strip steel is coated;
coating for later use;
a350 MPa grade high corrosion resistant coated steel sheet produced by adopting a short process comprises the following components in percentage by weight: c: 0.051-0.069%, si:0.15 to 0.25 percent, mn:0.60 to 0.80 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.012 percent, als:0.012 to 0.080 percent, N is not more than 0.010 percent, and the balance is Fe and unavoidable impurities.
2. A method for producing a 350 MPa-grade high corrosion-resistant coated steel sheet produced by a short process according to claim 1, characterized in that: the coating treatment procedure:
cleaning the surface of the strip steel subjected to continuous hot dip plating; then, coating an organic layer or an inorganic coating on the surface of the strip steel twice;
and then coating and curing the organic layer or the inorganic coating, and controlling the curing temperature to be 250-310 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700584.8A CN114959491B (en) | 2022-06-20 | 2022-06-20 | 350MPa grade high corrosion-resistant coated steel sheet produced by short process and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700584.8A CN114959491B (en) | 2022-06-20 | 2022-06-20 | 350MPa grade high corrosion-resistant coated steel sheet produced by short process and method |
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| Publication Number | Publication Date |
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| CN114959491A CN114959491A (en) | 2022-08-30 |
| CN114959491B true CN114959491B (en) | 2023-05-02 |
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| DE19543804B4 (en) * | 1995-11-24 | 2004-02-05 | Salzgitter Ag | Process for producing hot-dip galvanized steel strip and hot-dip galvanized sheet or strip made of steel made therewith |
| JP4510488B2 (en) * | 2004-03-11 | 2010-07-21 | 新日本製鐵株式会社 | Hot-dip galvanized composite high-strength steel sheet excellent in formability and hole expansibility and method for producing the same |
| JP4959161B2 (en) * | 2005-09-05 | 2012-06-20 | 新日本製鐵株式会社 | Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet with excellent corrosion resistance, elongation and hole expansibility |
| JP4887818B2 (en) * | 2006-02-15 | 2012-02-29 | Ｊｆｅスチール株式会社 | Manufacturing method of continuous cast slab and manufacturing method of high-tensile hot-rolled steel sheet, high-tensile cold-rolled steel sheet, and high-tensile galvanized steel sheet |
| CN101595235B (en) * | 2007-01-29 | 2011-02-09 | 杰富意钢铁株式会社 | High tensile cold-rolled steel sheet and process for production thereor |
| JP5381154B2 (en) * | 2009-02-24 | 2014-01-08 | Ｊｆｅスチール株式会社 | Cold-rolled steel sheet excellent in strength-ductility balance after press working and paint baking and method for producing the same |
| JP5549414B2 (en) * | 2010-06-23 | 2014-07-16 | Ｊｆｅスチール株式会社 | Cold-rolled thin steel sheet having excellent shape freezing property and manufacturing method thereof |
| CN102605244B (en) * | 2012-03-30 | 2014-02-19 | 武汉钢铁(集团)公司 | Painted steel for corrosion-resistant structure and production method of painted steel |
| CN105238999B (en) * | 2015-11-25 | 2017-01-25 | 武汉钢铁(集团)公司 | 350MPa grade thick standard hot-dip galvanized steel and production method thereof |
| CN106756560B (en) * | 2016-12-30 | 2018-11-06 | 日照钢铁控股集团有限公司 | The method for producing Thin Specs RE700L steel based on ESP bar strip continuous casting and rolling flow paths |
| CN112430787B (en) * | 2019-08-26 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof |
| CN113584383A (en) * | 2021-07-14 | 2021-11-02 | 武汉钢铁有限公司 | Short-process low-cost steel for door plate and manufacturing method thereof |
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