CN116200670A - Cold-rolled enamelled steel sheet with excellent adhesion performance and manufacturing method thereof - Google Patents
Cold-rolled enamelled steel sheet with excellent adhesion performance and manufacturing method thereof 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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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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- C22C38/00—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C21D2211/003—Cementite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a cold-rolled enamelled steel sheet with excellent adhesion performance and a manufacturing method thereof, wherein the cold-rolled enamelled steel sheet comprises the following chemical components in percentage by weight: 0.001 to 0.002 percent of Si:0.010 to 0.030 percent, mn:0.20 to 0.40 percent, P: less than or equal to 0.015 percent, S: 0.020-0.030%, O:0.01 to 0.02 percent of Nb:0.01 to 0.04 percent, and the balance of Fe and unavoidable impurities. The invention has the advantages that: the mass ratio of Mn element to Nb element in the optimized steel plate is controlled to be 9-15, the Mn element and the Nb element are fully combined with the O element to form a composite oxide, an optimized heat treatment process is selected, the composite oxide is controlled to be within 5 mu m in size and distributed in a dispersed manner, a large number of irreversible hydrogen traps distributed in a dispersed manner are formed, the effect of improving the anti-scaling performance of the steel plate is exerted, meanwhile, the adhesion degradation influence caused by using Ti element compounds as the irreversible hydrogen traps is avoided, and the performance of the anti-scaling characteristic TH value is more than 35, the critical value is 6.8, and the adhesion grade is more than or equal to 1 grade can be realized through the technology.
Description
Technical Field
The invention relates to the technical field of cold-rolled sheet strip production, in particular to a cold-rolled enameled steel sheet with excellent adhesion performance and a manufacturing method thereof.
Background
The cold-rolled enamelled steel sheet has very close relation with people in daily life, is widely applied to the industries of light industry, household appliances, metallurgy, chemical industry, construction and the like, and is used for manufacturing kitchen utensils, sanitary ware, barbecue ovens, water heater inner containers, building decoration panels, chemical reaction tanks and the like.
The performance requirements of the cold-rolled enameled steel mainly comprise the aspects of strength, formability, anti-scaling property, adhesion, weldability and the like, and the enameled steel with different purposes is required to have different comprehensive performances. The adhesion property is one of important properties required to be possessed in the application of the cold rolled enameled steel sheet.
The enamel and the steel plate are two materials with different structures and compositions, the combination process between the enamel and the steel plate is very complex physical and chemical change, and the adhesion performance is an important index for measuring the combination strength between the enamel and the steel plate. The factors influencing the adhesion performance of enamel products are very complex and mainly comprise the performance of steel plates, the components of glaze materials, the enameling process, the enameling temperature, the enameling time and the like. Too high a Ti content in the steel can reduce the adhesion performance of the enamel, and how to ensure that the cold-rolled enamel steel has excellent adhesion performance and good anti-scaling performance under the condition of not adding Ti element becomes a difficult point.
The publication number is CN107868908A, a cold-rolled enamel steel for deep-drawing double-sided dry enamelling and a production method thereof are disclosed, and the cold-rolled enamel steel for deep-drawing double-sided dry enamelling is provided with the following chemical components in percentage by weight: 0.0015 to 0.0060 percent, si:0.010 to 0.030 percent, mn:0.12 to 0.20 percent, P: less than or equal to 0.015 percent, S:0.008 to 0.015 percent, als:0.010 to 0.040 percent, ti:0.06% -0.10%, N:0.0050% -0.011%, and the balance of Fe and unavoidable impurities. Compared with the prior art, the enamelled steel sheet produced by the invention has excellent stamping performance, the yield strength is 150-180 MPa, the tensile strength is 270-350 MPa, and the hydrogen permeation time is more than or equal to 21min.
The publication number is CN101082107A, and discloses an ultralow-carbon cold-rolled deep-drawn enamel steel and a production method thereof, wherein the ultralow-carbon cold-rolled deep-drawn enamel steel produced by the method comprises the following chemical components in percentage by weight: c:0.002% -0.005%, si:0.004 to 0.020 percent, mn:0.08 to 0.13 percent, P:0.006% -0.020%, S:0.01 to 0.035 percent, als:0.010 to 0.040 percent, ti:0.05 to 0.09 percent, N is less than or equal to 0.004 percent, and the balance is Fe and unavoidable impurities. Compared with IF steel, the invention improves the content of Ti and S, is favorable for precipitating Ti4C2S2 second phase particles in the production process of the steel, can effectively fix and store H atoms of the steel, ensures that the H atoms are not easy to come out of the steel, and ensures that the enamel cannot be subjected to scale explosion. In addition, the Ti4C2S2 precipitated phase does not affect the deep drawability of the steel.
Publication No. CN102899565A discloses a cold-rolled steel for enamel and a manufacturing method thereof. The cold-rolled enamel steel produced by the method comprises the following chemical components in percentage by weight: c:0.002 to 0.010 percent, si is less than or equal to 0.03 percent, mn:0.10 to 0.40 percent, P is less than or equal to 0.015 percent, S:0.018% -0.035%, als:0.020% -0.070%, N:0.004% -0.010%, t=4c+3.42n+1.5s+Δti, nb:0.005% -0.05%, cu:0.01% -0.05%, and simultaneously satisfies Δti:0 to 0.02 percent, nb+delta Ti is more than or equal to 0.02 percent, and the balance is Fe and unavoidable impurities. The nitrogen circulation process is used for improving and accurately controlling the nitrogen content in the steel, reducing the production cost and improving the anti-scaling property and the adhesion, and is suitable for manufacturing the building decoration panel.
The publication number is CN100396808C, discloses cold-rolled enamel steel with excellent anti-scaling property and ultra-deep drawing property and a manufacturing method thereof, relates to cold-rolled enamel steel and a manufacturing method thereof, and in particular relates to cold-rolled enamel steel with ultra-low carbon and excellent anti-scaling property and ultra-deep drawing property and a manufacturing method thereof. Solves the defect that the scale explosion resistance and ultra deep drawing resistance of the existing cold rolled enamel steel are not ideal. The cold-rolled enamel steel with excellent fishscale resistance and ultra-deep drawing property comprises the following components in percentage by weight: carbon less than or equal to 0.005%, silicon less than or equal to 0.030%, manganese 0.10-0.30%, phosphorus less than or equal to 0.015%, sulfur 0.010-0.050%, aluminum 0.020-0.050%, nitrogen 0.004-0.015%, titanium= (4C+3.42N+1.5S) + (0.02-0.04%), and the balance of iron and other unavoidable impurities. And the content of C+0.5S+0.886N is controlled to be more than or equal to 0.01% and less than or equal to 0.03%. A new nitrogen circulation method is adopted in the vacuum degassing treatment to control nitrogen in steel and the annealing process in a hood-type annealing furnace in a full hydrogen or an atmosphere containing very low nitrogen. The method is mainly used for manufacturing cold-rolled enamel steel with excellent anti-scaling property and ultra-deep drawing property.
In summary, in the prior art, the irreversible hydrogen traps are formed mainly by adding Ti element, so that the anti-scaling performance of the enamel steel is improved, but the excessive Ti content in the steel can reduce the adhesion performance of the enamel, and the overall enameling performance of the steel plate is affected.
Disclosure of Invention
The invention aims to provide a cold-rolled enamelled steel sheet with excellent adhesion performance and a manufacturing method thereof, wherein the composite oxide is formed by controlling the content of chemical components of the steel sheet and optimizing a continuous annealing process, the size and the distribution of the composite oxide are controlled, a large number of irreversible hydrogen traps are separated out, the anti-scaling performance of the steel sheet is improved, and meanwhile, the problem of adhesion degradation caused by excessive addition of Ti element is avoided.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
a cold-rolled enamelled steel sheet with excellent adhesion performance comprises the following chemical components in percentage by weight: 0.001% -0.002%, si:0.010 to 0.030 percent, mn:0.20% -0.40%, P: less than or equal to 0.015 percent, S:0.020% -0.030%, O:0.01% -0.02%, nb:0.01 to 0.04 percent, and the balance of Fe and unavoidable impurities.
Also comprises one or more of the following elements: cu:0.015% -0.035%, B:0.0008% -0.0024%, mo:0.20 to 0.50 percent.
Mn-Nb composite oxide exists in the steel plate, the mass ratio of Mn and Nb elements in the Mn-Nb composite oxide is 9-15, the Mn-Nb composite oxide has a size of less than 5 mu m and the number is not less than 2.0x10 per square millimeter 2 And each.
Wherein the chemical components act as follows:
carbon (C): carbon is a strengthening element, the higher the carbon content is, the higher the strength of the steel plate is, but the plasticity is reduced, meanwhile, a large amount of CO is generated by the excessively high carbon content to precipitate steel base, and the steel base is gathered between the steel plate and the enamel layer, so that the enamel layer is damaged, and the adhesion performance is reduced. Therefore, the content of C is controlled to be less than or equal to 0.0020 percent.
Silicon (Si): silicon is a detrimental element that is usually present in the steel in solid solution, reducing the toughness and ductility of the steel, and too high a silicon content reduces the adhesion of the enamel to the steel. Therefore, the Si content is controlled to be 0.010-0.030%.
Manganese (Mn): when a certain amount of Mn exists in the steel, the toughness of the steel can be improved, so that the steel plate has good stamping performance, mn can be combined with S to generate stable manganese sulfide, meanwhile, mn can be combined with Nb and O to form Nb-Mn composite oxides, and the Nb-Mn composite oxides can jointly act as second phase particle precipitation to improve the hydrogen storage performance of the steel plate, but when the content of Mn is too high, the adhesiveness of enamel is poor, and bubbles and black spots are easy to generate. Therefore, the Mn content is controlled to be 0.20-0.40%.
Phosphorus (P): phosphorus is a harmful element, increases the brittleness of steel with increasing content, deteriorates deep drawing performance, and is liable to be biased on grain boundaries in steel, bubbles and black spots are generated during enameling, and the surface quality of enamel is affected. Therefore, the lower the phosphorus content in the steel, the better, and the range is controlled to be less than or equal to 0.015 percent.
Sulfur (S): sulfur is generally a harmful element in steel, but in cold-rolled enamel steel, sulfur can form manganese sulfide with manganese, which helps to improve the fishscale resistance of the enamel steel. Therefore, the S content is controlled to be 0.020-0.030 percent.
Oxygen (O): oxygen can form a composite oxide with Mn and Nb in steel to serve as irreversible hydrogen traps, so that the anti-scaling performance of enamel steel is improved, but the oxygen content is too low to form a sufficient number of irreversible hydrogen traps, and too high oxygen content can cause excessive loss of refractory materials, so that normal production cannot be realized. Therefore, the O content is controlled to be 0.01-0.02%.
Niobium (Nb): the niobium added in the steel can be combined with oxygen and manganese in the steel to form a composite oxide, so that the composite oxide can be used as a good hydrogen storage place to prevent the steel plate from scaling after enameling, but excessive inclusions and second-phase particles can damage the formability of the steel plate. Therefore, the Nb content is controlled to be 0.01% -0.04%.
Copper (Cu): cu can form CuS with S as irreversible hydrogen trap to raise the scale explosion resistance of cold rolled enamel steel, and during pickling, porous Cu or copper sulfide film is formed on the surface of the steel plate to produce galvanic corrosion as cathode during enameling and enameling to raise the adhesion performance of enamel. Therefore, the Cu content is controlled to be 0.015-0.035%.
Boron (B): boron is offset at the grain boundary to obviously increase the content of cementite particles in ferrite grains and increase the number of hydrogen traps, and on the other hand, the boron is offset at the grain boundary, cementite particles and inclusions to increase the lattice distortion degree of stress fields near the interface, improve the activation energy of the hydrogen traps at and near the interface of each precipitated phase and a matrix, and prevent carbon atoms from precipitating and precipitating at the grain boundary, so that cementite is easier to appear in the ferrite grains. Meanwhile, boron in the grain boundary has the effect of preventing recrystallization and diffusion, prevents crystal grains from growing up, improves the compactness and hot rolling performance of the steel, and improves the strength of the steel. Therefore, the content range of B is controlled to be 0.0008% -0.0024%.
Molybdenum (Mo): molybdenum can be dissolved in ferrite, austenite and carbide in a solid solution in steel, and when the content is low, iron and carbon can form composite cementite, and when the content is high, special carbide of molybdenum can be formed. Molybdenum has solid solution strengthening effect on ferrite, and improves the stability of carbide, so that CO generated by the reaction of C and O is controlled, and the CO gathers between the steel plate and the enamel to influence the adhesion performance of the enamel. Therefore, the Mo content is controlled to be 0.20-0.50%.
The mass ratio of Mn element to Nb element is 9-15, and when the mass ratio of the elements is too large, the Mn element is easy to enrich on the surface of the steel plate, so that the porcelain enamel and the steel plate are prevented from fully reacting, the adhesion performance is reduced, the mass ratio of the elements is too small, the elements cannot be fully combined to form a composite oxide, and the anti-scaling performance of the steel plate is not good.
The composite oxide is preferably smaller than 5 μm in size, and if the composite oxide is larger than 5 μm in size, oxidation per unit area is causedThe reduction of the amount of the oxide, namely, the reduction of the hydrogen traps, thereby affecting the hydrogen storage performance of the steel plate, reducing the anti-scaling performance of the steel plate, if the amount of the oxide is less than 2.0X10 per square millimeter 2 And the reversible hydrogen traps in the steel plate are insufficient, so that the steel plate cannot be guaranteed to have excellent anti-scaling performance.
The manufacturing method of the cold-rolled enameled steel sheet with excellent adhesion performance comprises the steps of molten iron pretreatment, converter smelting, RH furnace refining, continuous casting, hot rolling, cold rolling, continuous annealing, pickling and finished product packaging, and specifically comprises the following steps:
1) In the refining and continuous casting stage of RH furnace, the O content is controlled to be 400-500 ppm through forced decarburization and oxygen blowing and heating, and then aluminum is added for deoxidization, so that the total oxygen content is controlled to be 0.01% -0.02%.
2) And (3) hot rolling: hot rolling heating temperature: 1100-1250 ℃ and finishing temperature: 900-960 ℃, coiling temperature: 650-750 ℃;
3) Cold rolling: cold rolling reduction rate is 70-90%;
4) Continuous annealing: annealing temperature: the temperature of slow cooling is 800-850 ℃: 710-730 ℃, and quick cooling temperature: 380-420 ℃ and 350-400 ℃ of overaging section.
The above characteristic process parameters are selected for the following reasons:
in the refining and continuous casting stage of the RH furnace, in order to meet the component requirement of extremely low carbon content, forced decarburization and oxygen blowing heating are needed, the O content is finally controlled to be 400-500 ppm, aluminum is added for deoxidization, the total oxygen content is controlled to be 0.01-0.02%, and alloying treatment is performed.
The hot rolling process adopts higher heating temperature, can homogenize the austenite structure in steel, can promote the sufficient dissolution of Mn-Nb composite oxides and the like which are precipitated in steel billets, and can be re-precipitated in the form of compounds in the hot rolling and cooling processes, and the compounds are distributed in a matrix in a fine dispersion state to form hydrogen traps, so that the anti-scaling performance of the steel plate is improved. By adopting higher finishing temperature and coiling temperature, the transformation from an austenite structure to a ferrite structure can be generated in the rolling and coiling processes of the steel plate, and the recrystallization of the ferrite structure can be completed.
In the smelting process, alloy elements such as Mn, nb and the like are oxidized to form oxide inclusions, and because the oxide inclusions have strong brittleness and the malleability of ferrite matrixes and oxides are different, in the billet rolling thinning process, large-particle oxide inclusions are extruded and crushed into a large number of small-particle inclusions, micro holes can be formed around the inclusions, and the oxide inclusions and the micro holes are effective hydrogen traps, so that the hydrogen storage capacity of the steel plate is improved, and the scale explosion resistance of the steel plate is improved.
The steel plate is subjected to a continuous annealing process to realize the recrystallization of ferrite structures in the steel plate, the growth of crystal grains and the development of recrystallization textures. The higher annealing temperature can promote the development of the favorable structure, and also ensure that the cold rolling structure finishes recrystallization and the full growth of grains so as to improve the formability of the finished product. At a larger cooling rate, the supersaturated solid solution of C atoms is in a ferrite matrix, and a large number of cementite nucleation sites are generated in the steel due to a larger total cold rolling reduction rate, supersaturated carbon is dispersed and separated out in the form of cementite particles in the ferrite during overaging, meanwhile, boron element is aggregated in a ferrite grain boundary, and carbon atoms are further prevented from being precipitated and separated out in the grain boundary, so that cementite is easier to appear in the ferrite grain.
Compared with the prior art, the invention has the beneficial effects that:
the mass ratio of Mn element to Nb element in the optimized steel plate is controlled to be 9-15, the Mn element and the Nb element are fully combined with the O element to form a composite oxide, an optimized heat treatment process is selected, the composite oxide is controlled to be within 5 mu m in size and distributed in a dispersed manner, a large number of dispersed irreversible hydrogen traps are formed, the effect of improving the anti-scaling performance of the steel plate is exerted, meanwhile, the adhesion degradation influence caused by using Ti element compounds as the irreversible hydrogen traps is avoided, the anti-scaling characteristic TH value is more than 35, the critical value is 6.8, and the adhesion grade is more than or equal to 1 grade.
Detailed Description
Embodiments of the present invention will be further described with reference to specific examples.
A cold-rolled enamelled steel sheet with excellent adhesion performance comprises the following chemical components in percentage by weight: 0.001% -0.002%, si:0.010 to 0.030 percent, mn:0.20% -0.40%, P: less than or equal to 0.015 percent, S:0.020% -0.030%, O:0.01% -0.02%, nb:0.01 to 0.04 percent, and the balance of Fe and unavoidable impurities.
Also comprises one or more of the following elements: cu:0.015% -0.035%, B:0.0008% -0.0024%, mo:0.20 to 0.50 percent.
Mn-Nb composite oxide exists in the steel plate, the mass ratio of Mn and Nb elements in the Mn-Nb composite oxide is 9-15, the Mn-Nb composite oxide has a size of less than 5 mu m and the number is not less than 2.0x10 per square millimeter 2 And each.
The manufacturing method of the cold-rolled enameled steel sheet with excellent adhesion performance comprises the steps of molten iron pretreatment, converter smelting, RH furnace refining, continuous casting, hot rolling, cold rolling, continuous annealing, pickling and finished product packaging, and specifically comprises the following steps:
1) In the refining and continuous casting stage of RH furnace, the O content is controlled to be 400-500 ppm through forced decarburization and oxygen blowing and heating, and then aluminum is added for deoxidization, so that the total oxygen content is controlled to be 0.01% -0.02%.
2) And (3) hot rolling: hot rolling heating temperature: 1100-1250 ℃ and finishing temperature: 900-960 ℃, coiling temperature: 650-750 ℃;
3) Cold rolling: cold rolling reduction rate is 70-90%;
4) Continuous annealing: annealing temperature: the temperature of slow cooling is 800-850 ℃: 710-730 ℃, and quick cooling temperature: 380-420 ℃ and 350-400 ℃ of overaging section.
Examples are shown in the accompanying tables 1-3; wherein, the chemical components of each embodiment are shown in the accompanying table 1, the technological parameters of each embodiment are shown in the accompanying table 2, and the composite oxide parameters and enamel performance indexes of each embodiment are shown in the accompanying table 3.
Table 1 chemical composition (wt%) of each example
Table 2 process parameters of the examples
Table 3 parameters of the composite oxides and enamel Performance index of the examples
Note that: fishscale TH value=t b /d 2 Wherein t is b The hydrogen diffusion time is given in units: min, d is the thickness of the steel plate of the example, unit: mm.
In the attached tables 1 to 3, compared with the comparative examples, the examples have excellent adhesion performance while greatly improving the anti-scaling performance through the optimization control of the O element content, the Mn-Nb element mass ratio and the heat treatment process, wherein the adhesion performance of the examples 4 and 7 is more than or equal to 1 grade, the anti-scaling TH value is more than or equal to 45, and compared with the comparative examples, the anti-scaling performance is improved by 4 to 5 times, the adhesion performance is also improved to the optimal grade, and the anti-scaling performance is improved by 2 grades.
Performance test of steel plate:
performing pinhole defect test on the steel plate by utilizing an electric spark test, wherein the requirement is less than or equal to 22/ft2, performing hydrogen permeability test on the embodiment template by adopting a CS350 double-electrolytic cell test device, and calculating a scale explosion characteristic TH value so as to judge the quality of the scale explosion resistance of the embodiment template, wherein the critical TH value is more than or equal to 6.8, and the occurrence of scale explosion defects can be avoided; the adhesion was evaluated by using an HKCK MZ-890 adhesion tester, and the data in Table 3 shows that the sample plate of the example has excellent surface quality and excellent adhesion, and no pinhole and no scale explosion defect.
Best mode for carrying out the invention: as can be seen from the performance index test results of the examples, the adhesion performance of example 4 and example 7 is not less than 1 grade, and the fishscale resistance TH value is not less than 45, and the excellent performance is shown.
Claims (4)
1. A cold-rolled enamelled steel sheet with excellent adhesion performance is characterized in that the chemical components comprise the following components in percentage by weight: 0.001% -0.002%, si:0.010 to 0.030 percent, mn:0.20% -0.40%, P: less than or equal to 0.015 percent, S:0.020% -0.030%, O:0.01% -0.02%, nb:0.01 to 0.04 percent, and the balance of Fe and unavoidable impurities.
2. The cold rolled enamelled steel sheet with excellent adhesion properties according to claim 1, further comprising one or more of the following elements: cu:0.015% -0.035%, B:0.0008% -0.0024%, mo:0.20 to 0.50 percent.
3. The cold rolled enamelled steel sheet having excellent adhesion properties according to claim 1 or 2, wherein a Mn-Nb composite oxide is present in the steel sheet, the Mn-Nb composite oxide having a mass ratio of Mn to Nb elements of 9 to 15, the Mn-Nb composite oxide having a size of less than 5 μm and an amount of not less than 2.0X10 per square millimeter 2 And each.
4. A method for manufacturing a cold rolled enamelled steel sheet with excellent adhesion properties according to any one of claims 1-3, characterized in that the manufacturing method is a hot metal pretreatment-converter smelting-RH furnace refining-continuous casting-hot rolling-cold rolling-continuous annealing-pickling-finished product packaging, comprising the steps of:
1) In the refining and continuous casting stage of the RH furnace, the O content is controlled to be 400-500 ppm through forced decarburization and oxygen blowing and heating, and then aluminum is added for deoxidization, so that the total oxygen content is controlled to be 0.01% -0.02%;
2) And (3) hot rolling: hot rolling heating temperature: 1100-1250 ℃ and finishing temperature: 900-960 ℃, coiling temperature: 650-750 ℃;
3) Cold rolling: cold rolling reduction rate is 70-90%;
4) Continuous annealing: annealing temperature: the temperature of slow cooling is 800-850 ℃: 710-730 ℃, and quick cooling temperature: 380-420 ℃ and 350-400 ℃ of overaging section.
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| CN111057828A (en) * | 2019-12-24 | 2020-04-24 | 新余钢铁股份有限公司 | High-oxygen enamel steel and production method thereof |
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