CN114214557B - Steel for double-sided enamel and manufacturing method and application thereof - Google Patents
Steel for double-sided enamel and manufacturing method and application thereof Download PDFInfo
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Abstract
The invention discloses steel for double-sided enamel, a manufacturing method and application thereof, and belongs to the field of metal material smelting. The yield strength of the steel for double-sided enameling is not less than 480MPa, the tensile strength is not less than 560MPa, the elongation is not less than 15 percent, a low-C, micro-B, high-P and high-Ti component system is adopted, solid solution strengthening of Mn and P is utilized and combined to control precipitation strengthening of Ti and Nb, the strength of the steel plate after enameling is improved, the micro-B is utilized to avoid the problems of segregation of structural components, performance reduction and the like caused by high P, and the precipitation of Ti, nb, feTiP, BN and the like is controlled through a rolling process, so that the strength reduction after enameling can be compensated, a large number of hydrogen traps can be formed, the scale explosion resistance of the steel plate is improved, and the hydrogen permeation time t of the steel plate is not less than 480MPa, the tensile strength is not less than 560MPa, and the elongation is not less than 15 percent b More than or equal to 30min (converted into 1 mm), after twice enameling firing, the yield strength is more than 420MPa, the tensile strength is more than or equal to 500MPa, and the elongation is more than or equal to 20%. And the steel for double-sided enamel is simple and convenient to manufacture, low in cost and high in economic benefit.
Description
Technical Field
The invention belongs to the field of metal material smelting, and particularly relates to steel for double-sided enamel, and a manufacturing method and application thereof.
Background
The enamel steel is a composite material formed by enameling and high-temperature sintering of a high-quality steel plate (substrate) and a special functional inorganic non-metallic material through a novel electrostatic dry powder enameling process. It has the toughness and shock resistance of steel plate and other base material, and the super acid and alkali resistance, durability, wear resistance, non-combustion, easy cleaning, beautiful appearance, no radiation and other features of inorganic enamel layer, and may be used widely in environment protecting, light industry, household appliance, metallurgy, chemical industry, building and other industries. With the increasing demand of people on enamel products, the demand on the enamel steel plate with excellent deep drawing performance and enameling performance is urgent.
In the environmental protection trade, structures such as some dirty, waste water treatment facilities's water storage tank, treatment tank all adopt enamel split tank more, form through the riveting, because of the environment complicacy that enamel split tank is located, its internal surface receives the corruption of inboard sewage, reaction water, and the surface receives external corrosion in being in the air, consequently the split plate needs two-sided enamel to handle, just so can have stronger corrosion resisting property. With the consideration of safety and efficiency, the capacity of some water storage tank bodies is larger and larger, and gradually expands from thousands of cubes to tens of thousands of cubes in the past, so that higher requirements are put on the strength of the steel plate of the container. For 5000m 3 The yield strength of the sewage treatment tank after two enameling burns is stably up to more than 420MPa, and related researches that the sample plate can stably up to more than 420MPa after two enameling burns are less at present.
Due to the presence of H in the glaze 2 O, fe + H will occur in the steel plate during the enameling burning treatment 2 O→FeO+2[H]Reaction, large amount of generated [ H]The glaze layer and the substrate are gathered at the interface, and the scale explosion defect is easily generated, so that the whole part is scrapped. At present, the anti-scaling performance of the substrate is improved mainly by controlling the number of hydrogen traps in the substrate. The double-sided enamel steel has higher requirements compared with single-sided enamel, the single-sided enamel steel only needs to be coated with enamel on one side, and the double-sided enamel steel needs to be coated with enamel on two sides, so that 2 times of H can be generated in the process of enamel firing]Atomic, steel plate needs to hold 2 times of [ H ]]Atomic weight, and therefore scaling, is more likely to occur, and in order to solve this problem, double-sided enamelled steel requires a doubled number of "hydrogen traps" to ensure scaling resistance. Simultaneously, after the hot-rolled double-sided enameled pressed steel is coated on the front and back sides of the steel plate,after two times of enameling firing, the first enameling firing temperature is 860-930 ℃, the second enameling firing temperature is 850-900 ℃, the steel plate has phase change at the temperature, the structure can be recrystallized, the enrichment degree of dislocation, grain size and atoms can be redistributed, and partial precipitates in the steel plate can be remelted and precipitated, which inevitably causes the strength of the substrate to be reduced.
For example, the invention patent with publication number CN102796955B of hot rolling medium plate for enamel steel and a manufacturing method thereof discloses a hot rolling steel for enamel, which obtains steel with certain scale resistance by controlling the distribution of C element, adding micro alloy such as V, ti and the like, and controlling the rolling process, but the yield strength after enamel firing is lower and is 250-290 MPa. Also, as an invention patent "a hot rolled steel sheet for double-sided enameling at a post-enameling strength of 40 MPa grade and a manufacturing method thereof" of publication No. CN109423576A, there is disclosed a hot rolled double-sided enameled steel sheet having a post-enameling strength of more than 400MPa grade, which comprises the following chemical components (wt%): 0.08-0.15, si is less than or equal to 0.10, mn:1.0 to 2.0, P: 0.06-0.10, S is less than or equal to 0.006, ti:0.02 to 0.08, nb:0.01 to 0.05, V:0.020 to 0.055, als: 0.01-0.045, N is less than or equal to 0.008, mo: 0.015-0.30, when the thickness of the product is more than 8mm, B:0.0005 to 0.005, and the balance being Fe and unavoidable other impurity elements. According to the steel plate, a low-C, high-Mn and high-P component system is adopted to improve the strength of the steel plate after enameling firing, but the problems of segregation, casting blank layering and the like are easily caused due to the fact that a P element is high, performance is further reduced, meanwhile V, mo and the like added in the steel plate belong to precious metals, the performance of the material is improved, and the segregation effect is stabilized. The yield strength of the product after enameling and sintering is about 400-460 MPa, and the product can not be stabilized to be more than 420MPa. Further, as an invention patent publication No. CN108950423B of high-strength steel for hot rolling double-sided enamel, double-sided enamel steel and a manufacturing method thereof, chemical components (wt%) C:0.08 to 0.15, si:0.15 to 0.5, mn:1.2 to 2.5, P: not more than 0.03, S not more than 0.006, ti:0.01 to 0.06, nb:0.01 to 0.10, V:0.02 to 0.10, als: 0.006-0.08, N is less than or equal to 0.006, cr:0.15 to 0.65, mo:0.03 to 0.15, cu:0.1 to 0.35, and the balance of Fe and other inevitable impurity elements, and has high strength and good scale-explosion resistance after the enameling firing. Although the yield strength of the steel reaches 450-500 MPa after the steel is enameled, the steel is not beneficial to actual field operation due to more types of added components.
Disclosure of Invention
1. Object of the invention
The invention aims to provide double-sided enamel steel and a manufacturing method and application thereof, the double-sided enamel steel has the advantages of 3.0-10.0 mm thickness, greater than or equal to 480MPa yield strength, greater than or equal to 560MPa tensile strength, greater than or equal to 15% elongation, excellent fish scaling resistance, and hydrogen permeation time t b More than or equal to 30min (converted into 1 mm), after twice enameling and burning, the yield strength is more than or equal to 420MPa, the tensile strength is more than or equal to 500MPa, the elongation is more than or equal to 20 percent, and the sealing material has good adherence and can be assembled into a tank in the environmental protection industry. Specifically, the steel adopts a low-C, micro-B, high-Ti and high-P component system, the strength of the steel plate after being subjected to smoldering is improved by controlling Ti and Nb precipitation strengthening through solid solution strengthening combination of Mn and P, the problems of structural component segregation, performance reduction and the like caused by high P are avoided by using micro-B, and the precipitation of Ti, nb, feTiP, BN and the like is controlled through a rolling process, so that the strength reduction after the smoldering can be compensated, and a large number of hydrogen traps can be formed to improve the scale explosion resistance of the steel plate.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention provides steel for double-sided enamel, which comprises the following main chemical components in percentage by weight:
c:0.025 to 0.049 percent; si: less than or equal to 0.05 percent; mn:1.1 to 1.3 percent; p: 0.031-0.049%; s:0.015 to 0.025 percent; ti:0.12 to 0.15 percent; nb:0.01 to 0.02 percent; and Als:0.025 to 0.045 percent; n:0.002 to 0.005 percent; b:0.0008 to 0.0016 percent; the balance of Fe and inevitable impurities, wherein the component system needs to satisfy the following requirements:
equation 1:
formula 1 shows the contribution coefficient of the solid solution strengthening effect of P, mn and Si to the strength under the composition system of the invention;
equation 2:
formula 2 shows that Ti and Nb precipitate TiN, tiC, nbN, nbC and Ti under the composition system of the invention 4 C 2 S 2 The intensity contribution coefficient of (a);
wherein:
carbon (C): the steel is the most economical strengthening element in the steel, the strength of the steel is improved mainly through solid solution strengthening and precipitation strengthening, pearlite and bainite structures are easily formed in the structures, in addition, C and elements such as Ti, nb and the like form second phase particles including composite particles such as TiC, ti (C, N), nbC, nb (C, N) and the like, the particles are uniformly distributed in the structures, a large number of coherent and noncoherent interfaces are formed at the interfaces of the particles and a matrix, a large number of hydrogen atoms can be stored, and meanwhile, the particles can bring precipitation strengthening effects; however, the content of C should not be too high, and C and H will be formed during enameling burning 2 O reacts to form CO and CO 2 Leading to a large number of pores on the glaze layer; meanwhile, the C element is too high, a large amount of carbide can be formed in the original plate, the structural distortion is caused, the dislocation strengthening is higher, the phase change and recrystallization processes of the structure are generated along with the enameling burning process, the dislocation disappears, the crystal grains grow up, partial precipitates are reformed, and the initiation strength is reduced, so that the C element is controlled within the range of 0.025-0.049%;
silicon (Si): the steel plate is a strengthening element and can play a role of solid solution in ferrite, but the plasticity and the surface adherence of the steel plate are influenced by the over-high content of Si, so that the content of Si is not easy to be too high and is controlled to be less than or equal to 0.050 percent;
manganese (Mn): is one of important elements for strengthening the substrate, can effectively improve the strength of the steel plate, has better economical efficiency of Mn element, can expand an austenite phase region and reduce A when being widely added into the steel plate C3 In the enameling process, the dissolved hydrogen content of austenite is increased, the scaling possibility is increased in the subsequent cooling process, and the Mn content is controlled to be 1.1-1.3%;
phosphorus (P): one is solid solution strengthening element, P exists in two forms in the structure, one is in a replacement solid solution mode, the other is in the form of P precipitate FeTiP and the like, because the atomic diameter of P is much larger than the atomic radius of a matrix, lattice distortion is caused, the number and attraction force of 'hydrogen traps' are increased, meanwhile, the stress field and the strain field caused by distorted lattices can block dislocation movement, the strength of the steel plate is increased, the dislocation can not change due to the influence of temperature, and therefore the strength of the steel plate after being subjected to enameling firing can be improved; however, the P element is easily segregated at grain boundaries, and the ductility and toughness of the substrate are lowered. Therefore, the trace amount of B is added, so that the P can be preferentially gathered at a crystal boundary, the segregation of P is avoided, and the defects caused by the segregation of part of P can be reduced; meanwhile, the content of the P element cannot be too high, and the too high content can cause central segregation during continuous casting, so that the casting blank is layered, and therefore, the content of the P element is controlled to be 0.031-0.049%;
sulfur (S): usually combines with Mn to form MnS, and if Ti exists in the steel, ti (C, S) composite precipitates can be formed, so that the fish scaling resistance of the steel plate can be improved; but the transverse plasticity and the toughness are poor due to the over-high sulfur content, so the S element content needs to be controlled to be 0.015-0.025 percent;
titanium (Ti): the steel plate is easy to be compounded with C and N to form various TiN, tiC, ti (C, N) and Ti (C, S) precipitates, and has great effect on improving the scale explosion resistance of the steel plate; meanwhile, precipitates can be uniformly distributed in the structure through the control of a hot rolling process, and the strength of the steel plate is improved in a precipitation strengthening mode; meanwhile, a large amount of TiC precipitates which are mainly melted back at 600-1000 ℃ are prevented from being formed in the structure, so that the re-formation and further the strength after the enameling are influenced in the enameling firing process, and the precipitation of particles which are difficult to melt back, such as TiN and Ti, is preferentially controlled 4 S 2 C 2 And other precipitates, so the present patent Ti:0.12 to 0.15 percent;
niobium (Nb): crystal grains can be effectively refined, solid solution atoms can be replaced in steel, and crystal grain boundaries can be pinned in the structure, so that the size of the crystal grains is reduced; meanwhile, precipitates NbN, nbC and the like formed by Nb can play a role in precipitation strengthening, the strength of the steel plate is improved, the precipitates can also be used as a hydrogen trap, the scale explosion resistance is improved, and the Nb:0.01 to 0.02 percent;
aluminum (Al): can be used as a main deoxidizer, and simultaneously, the aluminum also has a certain effect on grain refinement. Aluminum has the disadvantage of affecting hot workability, weldability and machinability of steel. Meanwhile, al forms oxides in steel, and the ductility and toughness of the material are reduced. The control range of the Al content is 0.025-0.045%;
nitrogen (N): can improve the strength, low-temperature toughness and weldability of steel, increase aging sensitivity, form precipitates with Ti, nb and the like, and improve the fish scaling resistance. The percentage content control range of N in the invention is 0.002-0.005%;
boron (B): the proper amount of B element can increase the second phase nucleation point, improve the fish scaling resistance of the steel plate, the increased nucleation point of the B, C and N composite phase can promote the nucleation of crystal grains, reduce the size of the crystal grains and improve the strength of the steel plate, meanwhile, BN begins to precipitate at 1000-1200 ℃, completely precipitates at 800-900 ℃, can control the precipitation of the BN through the heating temperature, the initial rolling temperature and the final rolling temperature, and the BN cannot melt back during twice enameling, thereby avoiding the strength reduction caused by the melt back of the BN and ensuring the strength of the steel plate after enameling; meanwhile, the B element can be preferentially gathered at the crystal boundary to fill in the vacancy and the defect, so that the decrease of the ductility and the toughness of the steel caused by the gathering of the P element at the position is avoided; this patent B:0.0008 to 0.0016 percent.
Preferably, the steel for double-sided enamel comprises the following main chemical components in percentage by weight:
c:0.027%; si:0.041 percent; mn:1.28 percent; p:0.036%; s:0.019%; ti:0.135%; nb:0.012%; and Als:0.031%; n:0.0025 percent; b:0.0010%; the balance being Fe and unavoidable impurities, in which case:
equation 1:
equation 2:
preferably, the steel for double-sided enamel comprises the following main chemical components in percentage by weight:
c:0.033%; si:0.033%; mn:1.3 percent; p:0.031%; s:0.021%; ti:0.147%; nb:0.017 percent; and (3) Als:0.043 percent; n:0.0035%; b:0.0012 percent; the balance being Fe and unavoidable impurities, in which case:
equation 1:
equation 2:
preferably, the double-sided enamel steel comprises the following main chemical components in percentage by weight:
c:0.030 percent; si:0.04 percent; mn:1.18 percent; p:0.042 percent; s:0.015 percent; ti:0.12 percent; nb:0.01 to 0.02 percent; and (3) Als:0.025%; n:0.0032%; b:0.0008; the balance being Fe and unavoidable impurities, in which case:
equation 1:
equation 2:
preferably, the double-sided enamel steel comprises the following main chemical components in percentage by weight:
c:0.0042%; si:0.025 percent; mn:1.22 percent; p:0.049 percent; s:0.021%; ti:0.125%; nb:0.015 percent; and Als:0.037%; n:0.0024%; b:0.0015 percent; the balance being Fe and unavoidable impurities, in which case:
equation 1:
equation 2:
preferably, the steel for double-sided enamel comprises the following main chemical components in percentage by weight:
c:0.049 percent; si:0.012%; mn:1.11 percent; p:0.035%; s:0.018%; ti:0.15 percent; nb:0.012%; and Als:0.044%; n:0.0045 percent; b:0.0010%; the balance being Fe and unavoidable impurities, in which case:
equation 1:
equation 2:
preferably, the double-sided enamel steel comprises the following main chemical components in percentage by weight:
c:0.029%; si:0.035%; mn:1.25 percent; p:0.045%; s:0.022%; ti:0.148 percent; nb:0.014%; and Als:0.032%; n:0.0048%; b:0.0015 percent; the balance being Fe and unavoidable impurities, in which case:
equation 1:
equation 2:
preferably, the steel for double-sided enamel has yield strength not less than 480MPa, tensile strength not less than 560MPa, elongation not less than 15%, and hydrogen permeation time t b More than or equal to 30min (converted into 1 mm).
The invention also provides a preparation method of the steel for double-sided enamel, which comprises the following steps:
s1: pre-treating molten iron, and requiring pre-slagging and post-slagging; the target sulfur content after molten iron desulphurization is less than 0.015 percent;
s2: smelting in a converter, and deoxidizing alloy before tapping;
s3: RH, adjusting chemical components to a target value, and ensuring that the net circulation time is not less than 6min;
s4: continuous casting, wherein the target temperature of the tundish is controlled to be 20-35 ℃ above the liquidus temperature;
s5: controlling a hot rolling process, wherein in order to avoid surface defects after hot rolling caused by cracks on the surface and corners of the plate blank, hot charging rolling is adopted after continuous casting, and the surface temperature of the plate blank in a heating rolling furnace is more than or equal to 400 ℃; tapping temperature: 1240-1260 ℃, so that the steel grades of Ti and Nb are fully melted back with elements such as C, S, N, P and the like, and the secondary phase is controlled to be separated out again by the subsequent hot rolling process; 7, hot continuous rolling is carried out on a stand, the initial rolling temperature is 1080-1150 ℃, the high initial rolling temperature is adopted, so that a large number of nucleation points and deformation energy exist in the structure, second phase nucleation is promoted, the nucleation rate is increased, the defects of dislocation, vacancy and the like in the structure are increased, the solid solution amount of Mn, P, si and other elements can be increased, and the strength of the steel plate is improved; the finishing temperature is 870-930 ℃, the high finishing temperature is beneficial to the phase transformation of the structure, the grain of ferrite is promoted to be finer, and the precipitation of precipitates is promoted, and the positions are also important nucleation positions; after finishing rolling, the cooling rate is controlled to be 25-60 ℃/s to the coiling temperature of 600-700 ℃, the higher cooling rate can increase the supercooling degree, promote a large amount of nucleation of precipitates at defect positions, improve the number of precipitates, reduce the size of the precipitates and be beneficial to the precipitation strengthening effect; and finally rolling to the final target thickness.
Preferably, the target thickness is 3.0 to 10.0mm.
The invention also provides the application of the double-sided enamel steel in preparing the double-sided enamel steel, wherein the double-sided enamel steel is subjected to two-time enamel firing, the first enamel firing is 860-930 ℃, the second enamel firing is 850-900 ℃, and the two-time enamel firing time is 6-10 min.
Preferably, the yield strength of the double-sided enamel steel is more than 420MPa, the tensile strength is more than or equal to 500MPa, and the elongation is more than or equal to 20%.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The steel for double-sided enamel provided by the invention has the advantages that the yield strength is not less than 480MPa, the tensile strength is not less than 560MPa, the elongation is not less than 15%, the steel has excellent fish scaling resistance, and the hydrogen permeation time t b Not less than 30min (converted into 1 mm).The steel adopts a low-C, micro-B, high-Ti and high-P component system, the strength of the steel plate after being subjected to the smoldering is improved by controlling the precipitation strengthening of Ti and Nb by utilizing the solid solution strengthening combination of Mn and P, the problems of structural component segregation, performance reduction and the like caused by high P are avoided by utilizing micro-B, and the precipitation of Ti, nb, feTiP, BN and the like is controlled by a rolling process, so that the strength reduction after being subjected to the smoldering can be compensated, a large number of hydrogen traps can be formed, and the scale-explosion resistance of the steel plate is improved. After twice enameling and burning, the yield strength is more than 420MPa, the tensile strength is more than or equal to 500MPa, the elongation is more than or equal to 20 percent, and the enamel steel has good adherence and can be assembled into tanks in the environmental protection industry.
(2) According to the steel for double-sided enamel and the preparation method thereof, micro-alloy elements such as Cu, mo, V, cr and the like are not adopted, so that unnecessary process control caused by Cu brittleness possibly caused by Cu and field steelmaking process complication caused by elements such as Mo, V, cr and the like is avoided, and the steel is simple and convenient to manufacture, low in cost and high in economic benefit.
(3) The double-sided enamel steel provided by the invention has stable yield strength of more than or equal to 420MPa, and can meet the requirement of 5000m 3 The above requirements for the sewage treatment tank.
Drawings
FIG. 1 shows a metallographic structure (500 times) of a steel for double-sided enameling in example 1;
FIG. 2 shows the metallographic structure (500 times) of the steel for double-sided enameling in example 2;
FIG. 3 shows the metallographic structure (500 times) of the steel for double-sided enameling in example 3;
FIG. 4 shows a metallographic structure (500 times) of a steel for double-sided enameling in example 4;
FIG. 5 shows a metallographic structure (500 times) of the steel for double-sided enameling in example 5;
FIG. 6 is a metallographic structure (500 times) of the steel for double-sided enameling in example 6;
FIG. 7 shows a metallographic structure (500 times) of the steel for double-sided enameling in example 1 after secondary enameling;
FIG. 8 is a metallographic structure (500 times) of the steel for double-sided enameling in example 2 after secondary enameling;
FIG. 9 shows a metallographic structure (500 times) of the steel for double-sided enameling in example 3 after secondary enameling;
FIG. 10 is a metallographic structure (500 times) of the steel for double-sided enameling in example 4 after secondary enameling;
FIG. 11 is a metallographic structure (500 times) of the steel for double-sided enameling in example 5 after secondary enameling;
FIG. 12 is a metallographic structure (500 times) of the steel for double-sided enameling in example 6 after secondary enameling;
FIG. 13 is the enamel results (no scaling on both sides) in example 2;
FIG. 14 is the enamel results (no scaling on both sides) in example 3;
FIG. 15 is the results of adhesion (one level) in example 3;
fig. 16 shows the result of adhesion in example 6 (first order).
Detailed Description
The invention is further described with reference to specific examples.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Examples
This example provides a steel for double-sided enamel of the present invention, a steel for double-sided enamel, and a comparison, and the chemical components of each example and the comparison are shown in table 1, and the balance is inevitable impurities and Fe.
TABLE 1 chemical compositions of examples and comparative examples
The component ratios of the above examples and comparative examples are shown in table 2:
TABLE 2 ingredient ratios of examples and comparative examples
The preparation methods of the above examples and comparative examples, wherein the preparation method of the steel for double-sided enamel of example 1 is:
s1: pre-treating molten iron, and requiring pre-slagging and post-slagging; the target sulfur content after molten iron desulphurization is less than 0.015 percent;
s2: smelting in a converter, and deoxidizing alloy before tapping;
s3: RH, adjusting chemical components to a target value, and ensuring that the net circulation time is not less than 6min;
s4: continuous casting, wherein the target temperature of the tundish is controlled to be 20-35 ℃ above the liquidus temperature;
s5: controlling the hot rolling process, and feeding the steel plate into a heating rolling furnace to ensure that the surface temperature is 450 ℃; tapping temperature: the temperature of 1242 ℃ ensures that the steel grades of Ti and Nb are fully melted back with elements such as C, S, N, P and the like, and is beneficial to controlling the re-precipitation of a second phase in the subsequent hot rolling process; 7, hot continuous rolling is carried out on a stand, the initial rolling temperature is 1098 ℃, the high initial rolling temperature is adopted, so that a large number of nucleation points and deformation energy exist in the structure, second phase nucleation is promoted, the nucleation rate is increased, the defects of dislocation, vacancy and the like in the structure are increased, the solid solution amount of Mn, P, si and other elements can be increased, and the strength of the steel plate is improved; the finishing temperature is 915 ℃, and the high finishing temperature is beneficial to the phase transformation of the structure, so that the crystal grains of ferrite are made finer, and precipitates are promoted to be separated out, and the positions are also important nucleation positions; after finish rolling, the cooling rate is controlled to be 35 ℃/s to the coiling temperature of 650 ℃, the supercooling degree can be increased by higher cooling rate, the large nucleation of the precipitate at the defect position is promoted, the quantity of the precipitate is increased, the size of the precipitate is reduced, and the precipitation strengthening effect is facilitated; and finally rolling to the final target thickness.
The preparation steps of the steel for double-sided enameling of examples 2 to 6 and comparative example are similar to those of the steel for double-sided enameling of example 1, except for the specific parameter settings, and the specific process parameters are shown in table 3:
TABLE 3 preparation Process parameters of the steels for double-sided enameling for examples and comparative examples
The mechanical properties of the above examples and comparative examples are shown in table 4:
TABLE 4 mechanical properties of examples and comparative examples
The hydrogen permeation times of the above examples and comparative examples are shown in Table 5 (the experimental method adopted the International Standard ISO 17081):
TABLE 5 hydrogen permeation time for examples and comparative examples
According to the experimental result, the hydrogen permeation experimental result of the invention patent is far better than that of the comparative example, and the hydrogen permeation time (converted into 1 mm) is more than 30min. Meanwhile, according to the actual enamel effect (see attached figures 1-16, in the embodiment, the metallographic structure of the steel for double-sided enamel after secondary enamel firing, the enamel result without scale explosion on double sides and the first-stage adherence result), the hot-rolled double-sided enamel steel obtained after the implementation of the patent has good scale explosion resistance and adherence.
The above examples show that, in examples 1 to 6 which adopt chemical compositions satisfying the design requirements of the patent, the hot-rolled double-sided enameled pressed steel prepared by the method has the thickness of 3.0 to 10.0mm, the yield strength of the prepared double-sided enameled pressed steel is not less than 480MPa, the tensile strength is not less than 560MPa, the elongation is not less than 15 percent, the yield strength of the double-sided enameled pressed steel is still more than 420MPa stably after two enamels (the first enamels are 860 to 930 ℃, the second enamels are 850 to 900 ℃, and the two enamels are all 6 to 10 min),the tensile strength is more than or equal to 500MPa, the elongation is more than or equal to 20%, and the alloy has excellent fish scaling resistance and hydrogen permeation time: t is t b Not less than 30min (converted into 1 mm). As in example 1, the hot-rolled double-sided enameled steel sheet is obtained, the yield strength is 602MPa, the tensile strength is 707MPa, the elongation is 26.5%, the formed structure is polygonal ferrite, the grain size is not less than 8.0, and after twice enameling firing, the yield strength is 430MPa, the tensile strength is 506MPa, the elongation is 34.5%, the grain size after enameling firing is more than 8.0, the double-sided enamel of the experimental steel sheet is not flaked, and the hydrogen permeation time tb is more than 30min.
The above description is only for the specific exemplary description of the present invention, and it should be noted that the specific implementation of the present invention is not limited by the above manner, and it is within the protection scope of the present invention as long as various insubstantial modifications are made by using the technical idea and technical solution of the present invention, or the technical idea and technical solution of the present invention are directly applied to other occasions without modifications.
Claims (9)
1. The steel for double-sided enamel is characterized in that the yield strength of the steel for double-sided enamel is not less than 480MPa, the tensile strength is not less than 560MPa, the elongation is not less than 15%, and the hydrogen permeation time t b More than or equal to 30min, the weight percentage of the main chemical components of the steel for double-sided enamel is as follows:
c:0.025 to 0.049%; si: less than or equal to 0.05 percent; mn:1.1 to 1.3 percent; p:0.031 to 0.049%; s:0.015 to 0.025 percent; ti:0.12 to 0.15 percent; nb:0.01 to 0.02 percent; and Als:0.025 to 0.045%; n:0.002 to 0.005%; b:0.0008 to 0.0016 percent; the balance of Fe and inevitable impurities, wherein the component system needs to meet the following requirements:
equation 1:
；
equation 2:
。
2. the steel for double-sided enamel according to claim 1, wherein the steel for double-sided enamel comprises the following main chemical components in percentage by weight: c:0.027%; si:0.041 percent; mn:1.28 percent; p:0.036%; s:0.019%; ti:0.135%; nb:0.012%; and Als:0.031%; n:0.0025%; b:0.0010%; the balance of Fe and inevitable impurities.
3. The steel for double-sided enamel according to claim 1, wherein the steel for double-sided enamel comprises the following main chemical components in percentage by weight: c:0.033%; si:0.033%; mn:1.3 percent; p:0.031%; s:0.021%; ti:0.147%; nb:0.017 percent; and Als:0.043 percent; n:0.0035%; b:0.0012 percent; the balance of Fe and inevitable impurities.
4. The steel for double-sided enamel according to claim 1, wherein the steel for double-sided enamel comprises the following main chemical components in percentage by weight: c:0.030%; si:0.04 percent; mn:1.18 percent; p:0.042 percent; s:0.015 percent; ti:0.12 percent; nb:0.01 to 0.02 percent; and Als:0.025%; n:0.0032%; b:0.0008 percent; the balance of Fe and inevitable impurities.
5. The steel for double-sided enamel according to claim 1, wherein the steel for double-sided enamel comprises the following main chemical components in percentage by weight: c:0.042 percent; si:0.025 percent; mn:1.22 percent; p:0.049 percent; s:0.021%; ti:0.125%; nb:0.015 percent; and (3) Als:0.037%; n:0.0024%; b:0.0015 percent; the balance of Fe and inevitable impurities.
6. The steel for double-sided enamel according to claim 1, wherein the steel for double-sided enamel comprises the following main chemical components in percentage by weight: c:0.049 percent; si:0.012%; mn:1.11 percent; p:0.035%; s:0.018%; ti:0.15 percent; nb:0.012%; and Als:0.044%; n:0.0045 percent; b:0.0010%; the balance of Fe and inevitable impurities.
7. The steel for double-sided enamel according to claim 1, wherein the steel for double-sided enamel comprises the following main chemical components in percentage by weight: c:0.029%; si:0.035%; mn:1.25 percent; p:0.045%; s:0.022%; ti:0.148 percent; nb:0.014%; and (3) Als:0.032%; n:0.0048%; b:0.0015 percent; the balance of Fe and inevitable impurities.
8. The method for producing steel for double-sided enamel according to any one of claims 1 to 7, characterized by comprising the steps of:
s1: pre-treating molten iron, and requiring front slag skimming and rear slag skimming; the target sulfur content after molten iron desulphurization is less than 0.015 percent;
s2: smelting in a converter, and deoxidizing alloy before tapping;
s3: RH, adjusting chemical components to a target value, and ensuring that the net circulation time is not less than 6min;
s4: continuous casting, wherein the target temperature of the tundish is controlled to be 20 to 35 ℃ above the liquidus temperature;
s5: controlling a hot rolling process, wherein the temperature of the surface of the plate blank entering a heating furnace is more than or equal to 400 ℃; tapping temperature: 1240 to 1260 ℃;7, hot continuous rolling of a frame, wherein the initial rolling temperature is as follows: 1080 to 1150 ℃; the finishing temperature is: 870 to 930 ℃; after finish rolling, controlling the cooling speed to be 25 to 60 ℃/s to the coiling temperature to be 600 to 700 ℃; and finally rolling to the final target thickness.
9. Use of the steel for double-sided enamel according to any one of claims 1 to 7 in the preparation of steel for double-sided enamel, characterized in that the steel for double-sided enamel is subjected to two enameling burns, the first enameling burn is 860 to 930 ℃, the second enameling burn is 850 to 900 ℃, and the two enameling burns are 6 to 10min.
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