CN112779386A - Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof - Google Patents
Cold-rolled hot-dip galvanized steel plate for easy-open-end pull ring and manufacturing method thereof Download PDFInfo
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- 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
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- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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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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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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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- 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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- 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
- C21D2211/003—Cementite
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- 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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- 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
- C21D2211/009—Pearlite
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Abstract
The invention discloses a cold-rolled hot-dip galvanized steel plate for an easy-open end pull ring and a manufacturing method thereof, and mainly solves the problems of high yield strength in the prior artThe edge strength of the 580 MPa-level cold-rolled hot-dip galvanized steel sheet is low, and the yield strength of the steel sheet in the width direction is not uniform. The invention provides a cold-rolled hot-dip galvanized steel sheet for an easy-open end pull ring, which comprises the following chemical components in percentage by weight: c: 0.045-0.070%, Si is less than or equal to 0.045%, and Mn: 0.10-0.25%, P is less than or equal to 0.030%, S is less than or equal to 0.025%, Alt: 0.010-0.060%, the rest is Fe and inevitable impurity elements. The metallographic structure of the cold-rolled hot-dip galvanized steel plate is fibrous ferrite, a small amount of pearlite and free cementite, and the yield strength R of the cold-rolled hot-dip galvanized steel plateP0.2580-760 MPa, and is mainly used for producing the pull ring of the easy-open end on an ultra-high speed line.
Description
Technical Field
The invention relates to a cold-rolled hot-dip galvanized steel sheet, in particular to a cold-rolled hot-dip galvanized steel sheet for an easy-open end pull ring and a manufacturing method thereof, belonging to the technical field of iron-based alloy.
Background
The hot-dip pure zinc-plated steel sheet is widely applied to the fields of construction industry, household appliance industry, industrial instrument industry, automobile industry, packaging industry and the like due to excellent corrosion resistance, coating property, processability and economy. The thin hot-galvanized all-hard steel can be used for producing an easy-open-end pull ring, is used for replacing an electrolytic tinning product, and has obvious price advantage.
The cold-rolled hot-dip galvanized steel sheet with the thickness of 0.25-0.60 mm is commonly used for producing an easy-open-end pull ring in an ultra-high speed line in recent years, the production speed is more than or equal to 500/min channel, and the use characteristics are as follows: the method comprises the steps of longitudinally cutting strip steel with the width of 800-1200 mm into narrow strips with the width of 20-60 mm, and processing the narrow strips by a continuous stamping and bending unit to punch, bend, turn over and the like to finally form an easy-open-end pull ring for combining with an easy-open-end top cover to form the easy-open-end. In order to meet the requirements of reasonable utilization rate of strip steel and ultrahigh speed cover line manufacturing, 2-5 mm edge wires are cut off from two sides of each steel plate, and the full-length yield strength of each narrow strip of the steel plate with the width of 20-60 mm needs to reach more than 580Mpa so as to ensure that the easy-open cover can be successfully buckled. The processing requirement puts forward a very high requirement on the strength uniformity of the hot-dip galvanized sheet in the length direction, particularly in the width direction, and especially for the temperature-sensitive all-hard steel, the yield strength of the full length and the full width (except for 2-5 mm at the edge) of the strip steel is required to reach more than 580 Mpa.
The application publication number CN101660091A discloses a high-strength and good-surface-quality all-hard hot-dip galvanized steel plate and a production method thereof, the steel plate is all-hard steel containing 0.02-0.10% of Ti and/or Nb, and the continuous annealing temperature is controlled at 600-710 ℃.
The application publication number CN103556096A discloses a production process method of a hard hot-dip galvanized steel sheet, which is a production process of the hard hot-dip galvanized steel sheet with the direct-combustion section temperature of 480-510 ℃ and the soaking section temperature of 540-570 ℃.
The application publication number CN14561875A discloses a hot galvanizing production process of a high-strength hot galvanized plate, which is a production process of a high-strength hot galvanized plate with the annealing temperature of 470-490 ℃.
Chinese patent application publication No. CN106191682A discloses a cold-rolled hot-dip galvanized steel sheet for easy-open end tab and a production method thereof, and in the disclosed technical scheme, C: 0.025 to 0.04 percent, Mn: 0.26-0.35%, B: 0.004-0.005 percent, the finish rolling temperature is 840-850 ℃, the coiling temperature is 550-560 ℃, the annealing time of the strip steel in the soaking section is 70-90 s, and the temperature of the soaking section for annealing of the continuous annealing furnace is 570-580 ℃.
According to the prior art, the horizontal annealing furnace is used for production, the horizontal annealing furnace is provided with a direct-fired section, burners of the direct-fired section are arranged on two sides of a furnace wall, when strip steel passes through the direct-fired section, the temperature of the edge of the strip steel is obviously higher than that of the middle part, the edge strength of a product is usually lower than 480Mpa, and the requirement that the full-width yield strength of the strip steel cannot be lower than 580Mpa for the use of an easy-open end pull ring cannot be met.
Disclosure of Invention
The invention aims to provide a cold-rolled hot-dip galvanized steel sheet for an easy-open-end pull ring and a manufacturing method thereof, and mainly solves the technical problems that the cold-rolled hot-dip galvanized steel sheet with the yield strength of 580MPa is low in edge strength and uneven in yield strength in the width direction of the steel sheet in the prior art.
The cold-rolled hot-dip galvanized steel plate with the width of 800-1200 mm is longitudinally cut into steel plates with the width of 20-60 mm, the total length yield strength of each steel plate with the width of 20-60 mm is not lower than 580MPa, the requirement of producing an easy-open-end pull ring by an ultra-high speed line is met, and the production speed of the ultra-high speed line is not less than 500/min per channel.
The applicant finds that the burners of the direct-fired section of the horizontal continuous annealing furnace are distributed on the furnace wall and are closer to the edge of the strip steel, so that the temperature of the edge of the strip steel is higher than that of the middle part, and the strength of the edge of the strip steel is obviously lower; the invention aims at the characteristics of horizontal continuous annealing furnace equipment, adopts different suitable direct-fired section and soaking section temperatures for products with different widths, particularly controls the direct-fired section temperature, and ensures the uniformity of the strength of the strip steel plate in the width direction.
The invention adopts the technical scheme that a cold-rolled hot-dip galvanized steel plate for an easy-open end pull ring comprises the following chemical components in percentage by weight: c: 0.045-0.070%, Si is less than or equal to 0.045%, and Mn: 0.10-0.25%, P is less than or equal to 0.030%, S is less than or equal to 0.025%, Alt: 0.010-0.060%, the rest is Fe and inevitable impurity elements.
The metallographic structure of the cold-rolled hot-dip galvanized steel sheet is fibrous ferrite, a small amount of pearlite and free cementite, the grain size grade of the ferrite structure is I8-I10 grade, and the yield strength R of the cold-rolled hot-dip galvanized steel sheet with the thickness of 0.25-0.60 mmP0.2580 to 760MPa, tensile strength Rm580 to 760MPa, and a post-fracture elongation A80mm0.5-11%, and d is 0a qualified in 180 DEG bending test.
The reason why the chemical composition of the substrate of the cold-rolled hot-dip galvanized steel sheet for an easy-open tab of the present invention is limited to the above range is as follows:
carbon: 0.09-0.12% of sub-peritectic region and 0.17-0.23% of peritectic region, which need to be avoided, and avoid the great increase of continuous casting production difficulty; the production cost of steelmaking with too low carbon content can be greatly increased; and combining the two factors, and setting the content range of C to be 0.045-0.070%.
Manganese: important solid solution strengthening elements are added to ensure the comprehensive mechanical strength of steel, proper Mn is added to improve the strength of the steel plate, the mechanical property of the steel plate is considered, and the low cost requirement is also considered, wherein the Mn content control range is as follows: 0.10 to 0.25 percent.
Silicon: the silicon contributes a great degree to the strength, but the heating process of the horizontal annealing furnace is an oxidizing atmosphere, silicon elements in the steel plate are easily oxidized, the bonding force of an aluminum-plated zinc coating is unfavorable, according to the test result, no silicon alloy is added in the production and manufacturing process, and the content of Si is designed to be 0-0.045%.
Sulfur: the S in the invention is an impurity element, and the control range of the S is required to be less than or equal to 0.025 percent according to the actual steelmaking production capacity.
Phosphorus: p in the invention is an impurity element, and the content of P is required to be controlled to be less than or equal to 0.030 percent according to the actual steelmaking production capacity.
Aluminum: the aluminum element mainly plays a role in removing oxygen in the steel, avoiding the formation of non-metallic inclusions in the solidification process, and simultaneously fixing nitrogen in the steel in the form of aluminum nitride, but the excessive aluminum affects the coating adhesion of the steel. Therefore, the aluminum content is preferably 0.010 to 0.060%.
A method for manufacturing a cold-rolled hot-dip galvanized steel sheet for an easy-open end tab, comprising the steps of:
continuously casting molten steel to obtain a continuous casting plate blank, wherein the molten steel comprises the following components in percentage by weight: c: 0.045-0.070%, Si is less than or equal to 0.045%, and Mn: 0.10-0.25%, P is less than or equal to 0.030%, S is less than or equal to 0.025%, Alt: 0.010-0.060%, the balance being Fe and inevitable impurity elements;
heating the continuous casting plate blank to 1180-1250 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-section rolling process, the rough rolling is 5-pass continuous rolling, and the finishing temperature of the rough rolling is 1040-1100 ℃; the finish rolling is 7-pass continuous rolling, and the finish rolling finishing temperature is 850-890 ℃; after finish rolling, the thickness of the steel plate is 1.8-2.0 mm, laminar cooling adopts front-section cooling, and the coiling temperature is 580-640 ℃ to obtain a hot rolled steel coil;
the hot rolled steel coil is uncoiled again, then is subjected to acid pickling, trimming, cold rolling, annealing in a horizontal continuous annealing furnace, hot galvanizing and leveling, and is coiled to obtain a finished cold rolled hot galvanized steel plate with the thickness of 0.25-0.60 mm, wherein the cold rolling reduction rate is 60-88%; annealing the cold-rolled strip steel in a hard rolling state in a horizontal continuous annealing furnace, wherein when the width of the cold-rolled strip steel is 800-999 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 470-510 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 520-560 ℃; when the width of the cold-rolled strip steel is 1000-1250 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 410-450 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 510-550 ℃; the time of the strip steel in the direct combustion section is 44-54 s, and the annealing time of the strip steel in the soaking section is 44-54 s; the flat elongation is 0.1-0.3%.
The production process adopted by the invention has the following reasons:
1. setting of heating temperature of continuous casting slab
In order to ensure the requirements of complete austenitization and subsequent hot working, and in consideration of the economical requirements, the heating temperature is preferably set to 1180 to 1250 ℃.
2. Setting of roughing finishing temperature
In order to facilitate the continuous processing of the subsequent finishing mill group and the control of the iron scale, the finish temperature of rough rolling is preferably 1040-1100 ℃.
3. Setting of finish Rolling finishing temperature
In order to obtain a steel plate with certain strength, high forming performance and flatness, the scale on the surface of a hot coil is difficult to control when the finish rolling temperature is too high, and the scale is easy to roll in a two-phase region and form edge waves when the finish rolling temperature is too low; comprehensively considering, the finishing temperature of finish rolling is controlled to be 850-890 ℃.
4. Setting of laminar cooling system and hot rolling coiling temperature
In order to obtain fine grains, rapid cooling needs to be carried out in the phase change process, meanwhile, the coiling temperature is reduced, the growth of ferrite grains can be controlled, the amount of brittle phase pearlite is reduced, the elongation of the material is improved, the laminar cooling adopts front-section cooling, and the coiling temperature is 580-640 ℃ to obtain the hot rolled steel coil.
5. Setting of Cold Rolling reduction
After the hot rolled steel coil is uncoiled again and the surface iron oxide scale is washed off by acid, the hot rolled steel coil is limited by rolling capacity after being subjected to cold rolling for multiple times on a cold continuous rolling mill or a reciprocating single-stand rolling mill, the cold rolling reduction is 60-88%, and the cost performance is good.
6. Setting of annealing temperature and annealing time
The direct-fired section burners of the horizontal continuous annealing furnace are distributed on the furnace wall, and when the width of the cold-rolled strip steel is more than or equal to 1000mm, the burners are closer to the edge of the strip steel, so that the temperature of the edge of the strip steel is higher than that of the middle part, and the strength of the edge of the strip steel is obviously lower, therefore, the temperature of the direct-fired section is properly reduced. However, the low temperature can also cause the unbalance of the furnace atmosphere, which is easy to cause dezincification defect, and when the width of the cold-rolled strip steel is less than 1000mm, the temperature of the direct-fired section can be properly increased. Comprehensively considering, annealing the cold-rolled strip steel in a hard rolling state in a horizontal continuous annealing furnace, wherein when the width of the cold-rolled strip steel is 800-999 mm, the temperature of the strip steel in a direct combustion section of the horizontal continuous annealing furnace is 470-510 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 520-560 ℃; when the width of the cold-rolled strip steel is 1000-1250 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 410-450 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 510-550 ℃; the time of the strip steel in the direct combustion section is 44-54 s, and the annealing time of the strip steel in the soaking section is 44-54 s.
7. Setting of the Flat elongation
The main purpose of leveling is to eliminate the yield platform of the material and adjust the surface roughness; too small a leveling rate causes poor surface quality, and because the material is hard, too high a leveling rate exceeds the capability of a leveling machine, and under the preferable condition, the leveling elongation rate is 0.1-0.3%.
The metallographic structure of the cold-rolled hot-dip galvanized steel sheet produced by the method is fibrous ferrite, a small amount of pearlite and free cementite, the grain size grade of the ferrite structure is I8-I10 grade, and the yield strength R of the cold-rolled hot-dip galvanized steel sheetP0.2580 to 760MPa, tensile strength Rm580 to 760MPa, and a post-fracture elongation A80mm0.5-11%, and d is 0a qualified in 180 DEG bending test.
Compared with the prior art, the invention has the following positive effects: 1. the hot-dip galvanized fully-hard steel disclosed by the invention meets the requirement that the full-length yield strength of each narrow band with the width of 20-60 mm reaches more than 580MPa except that side wires with the width of 2-5 mm are cut off from two sides respectively by reasonable annealing process control, is suitable for the purpose of an easy-open-end pull ring of an ultrahigh-speed cover line, and solves the technical problem that the prior art cannot meet the purpose of the easy-open-end pull ring of the ultrahigh-speed cover line. 2. The invention provides a special annealing process, which utilizes the existing acid rolling unit and hot galvanizing unit of a production line, does not need additional equipment modification and has simple manufacturing process.
Drawings
FIG. 1 is a photograph showing a metallographic structure of a cold-rolled hot-dip galvanized steel sheet according to example 1 of the present invention.
Detailed Description
The present invention is further illustrated in the following examples 1 to 5, which are shown in tables 2 to 5.
Table 1 shows the chemical composition (in weight%) of the substrate of the cold-rolled hot-dip galvanized steel sheet according to example 1 of the present invention, with the balance being Fe and unavoidable impurities.
Table 1 chemical components of the substrate of the cold-rolled hot-dip galvanized steel sheet of example 1 of the present invention, unit: weight percent of
The method comprises the steps of smelting in a converter to obtain molten steel meeting the requirement of chemical composition, blowing argon and adding alloy elements to obtain the molten steel meeting the requirement of the chemical composition, and continuously casting the molten steel to obtain a continuous casting slab, wherein the thickness of the continuous casting slab is 210-230 mm, the width of the continuous casting slab is 800-1200 mm, and the length of the continuous casting slab is 5000-10000 mm.
Sending the fixed-length plate blank produced in the steel-making process to a heating furnace for reheating, taking out of the furnace for dephosphorization, and sending the plate blank to a continuous hot continuous rolling mill for rolling; and controlling rolling by a rough rolling mill and a finish rolling continuous rolling unit, cooling the front section by laminar cooling, and then coiling to produce a hot rolled steel coil. The hot rolling process control is shown in Table 2.
TABLE 2 Hot Rolling Process control parameters of the inventive examples
And (2) uncoiling the hot rolled steel coil again, pickling and trimming, then carrying out cold rolling on a 5-stand cold continuous rolling mill or a reciprocating single-stand rolling mill, wherein the cold rolling reduction is 60-88%, annealing, hot galvanizing and leveling the cold rolled and hard rolled strip steel through a horizontal continuous annealing furnace, and coiling to obtain a finished cold rolled hot galvanized steel coil with the thickness of 0.25-0.60 mm. The annealing process comprises the following steps: annealing the cold-rolled hard strip steel in a horizontal continuous annealing furnace, wherein when the width of the cold-rolled strip steel is 800-999 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 470-510 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 520-560 ℃; when the width of the cold-rolled strip steel is 1000-1250 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 410-450 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 510-550 ℃; the time of the strip steel in the direct combustion section is 44-54 s, the annealing time of the strip steel in the soaking section is 44-54 s, and the flat elongation is 0.1-0.3%. The control parameters of the cold rolling, annealing and flattening processes are shown in Table 3.
TABLE 3 control parameters of the cold rolling, annealing and leveling processes of the examples of the present invention
Referring to fig. 1, the cold-rolled hot-dip galvanized steel sheet obtained by the method has a metallographic structure of fibrous ferrite, a small amount of pearlite and free cementite, the grain size of the ferrite structure is in the grade of I8-I10, and the yield strength R of the cold-rolled hot-dip galvanized steel sheetP0.2580 to 760MPa, tensile strength Rm580 to 760MPa, and a post-fracture elongation A80mm0.5-11%, and d is 0a qualified in 180 DEG bending test.
The cold-rolled hot-dip galvanized steel sheet obtained by the invention is subjected to a tensile test on a metal material according to GB/T228.1-2010 part 1: and (3) performing a tensile test according to a room temperature test method, testing the adhesive force of the coating according to a 180-degree bending test method specified in GB/T232-2010 Metal Material bending test method, wherein the bending core diameter d is 0a, and determining that the coating is qualified if no coating is peeled off from the outer surface of the sample after the bending test, otherwise determining that the sample is unqualified, wherein the mechanical properties of the steel plate are shown in Table 4.
TABLE 4 mechanical properties of hot-dip aluminum-zinc plated steel sheets according to embodiments of the present invention
The cold-rolled hot-dip galvanized steel sheet obtained by the invention is used for manufacturing an easy-open-end pull ring on an ultrahigh-speed cover line, has no cracking defect during continuous high-speed punching and bending, and meets the use requirements.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A cold-rolled hot-dip galvanized steel sheet for an easy-open end pull ring comprises the following chemical components in percentage by weight: c: 0.045-0.070%, Si is less than or equal to 0.045%, and Mn: 0.10-0.25%, P is less than or equal to 0.030%, S is less than or equal to 0.025%, Alt: 0.010-0.060%, the balance being Fe and inevitable impurity elements; yield strength R of cold-rolled hot-dip galvanized steel plate with thickness of 0.25-0.60 mmP0.2580 to 760MPa, tensile strength Rm580 to 760MPa, and a post-fracture elongation A80mm0.5-11%, and d is 0a qualified in 180 DEG bending test.
2. The cold-rolled hot-dip galvanized steel sheet for an easy-open end tab according to claim 2, wherein the cold-rolled hot-dip galvanized steel sheet has a metallographic structure of fibrous ferrite, a small amount of pearlite, free cementite, and a grain size of the ferrite structure is in a range of I8 to I10.
3. A method for manufacturing a cold-rolled hot-dip galvanized steel plate for an easy-open end pull ring is characterized by comprising the following steps:
continuously casting molten steel to obtain a continuous casting plate blank, wherein the molten steel comprises the following components in percentage by weight: c: 0.045-0.070%, Si is less than or equal to 0.045%, and Mn: 0.10-0.25%, P is less than or equal to 0.030%, S is less than or equal to 0.025%, Alt: 0.010-0.060%, the balance being Fe and inevitable impurity elements;
heating the continuous casting plate blank to 1180-1250 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-section rolling process, the rough rolling is 5-pass continuous rolling, and the finishing temperature of the rough rolling is 1040-1100 ℃; the finish rolling is 7-pass continuous rolling, and the finish rolling finishing temperature is 850-890 ℃; adopting front-section cooling for laminar cooling, and coiling at the coiling temperature of 580-640 ℃ to obtain a hot-rolled steel coil;
the hot rolled steel coil is uncoiled again, then is subjected to acid pickling, trimming, cold rolling, annealing in a horizontal continuous annealing furnace, hot galvanizing and leveling, and is coiled to obtain a finished cold rolled hot galvanized steel plate with the thickness of 0.25-0.60 mm, wherein the cold rolling reduction rate is 60-88%; annealing the cold-rolled strip steel in a hard rolling state in a horizontal continuous annealing furnace, wherein when the width of the cold-rolled strip steel is 800-999 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 470-510 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 520-560 ℃; when the width of the cold-rolled strip steel is 1000-1250 mm, the temperature of the strip steel in a direct-fired section of the horizontal continuous annealing furnace is 410-450 ℃, and the temperature of the strip steel in a soaking section of the horizontal continuous annealing furnace is 510-550 ℃; the time of the strip steel in the direct combustion section is 44-54 s, and the annealing time of the strip steel in the soaking section is 44-54 s; the flat elongation is 0.1-0.3%.
4. The method for producing a cold-rolled hot-dip galvanized steel sheet for an easy-open end tab according to claim 3, wherein the thickness of the hot-rolled steel sheet is controlled to be 1.8 to 2.0mm after the finish rolling.
5. The method for manufacturing a cold-rolled hot-dip galvanized steel sheet for an easy-open end tab according to claim 3, wherein the metallographic structure of the cold-rolled hot-dip galvanized steel sheet is fibrous ferrite, a small amount of pearlite and free cementite, and the grain size grade of the ferrite structure is I8-I10; yield strength R of cold-rolled hot-dip galvanized steel sheetP0.2580 to 760MPa, tensile strength Rm580 to 760MPa, and a post-fracture elongation A80mm0.5-11%, and d is 0a qualified in 180 DEG bending test.
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| CN114381589A (en) * | 2021-11-26 | 2022-04-22 | 安阳钢铁股份有限公司 | Preparation method of environment-friendly and economical steel for goods shelves |
| CN115505832A (en) * | 2021-06-07 | 2022-12-23 | 上海梅山钢铁股份有限公司 | Hot-dip aluminum-zinc steel plate for liquid crystal backboard with yield strength of 340MPa |
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Application publication date: 20210511 |