CN113913699A - Production method of cold-rolled enamel steel with yield strength of 300MPa - Google Patents
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- C—CHEMISTRY; METALLURGY
- 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
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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
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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
- 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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- 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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- 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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- 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
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- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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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- 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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Abstract
The invention relates to the technical field of enamel steel production; the invention aims to solve the technical problem of providing a production method of cold-rolled enamel steel with good fishscale resistance and forming performance and yield strength of 300 MPa. The production method of the cold-rolled enamel steel with the yield strength of 330MPa comprises the following steps: A. the raw material components by weight percentage are as follows: 0.01 to 0.08 percent of C, less than or equal to 0.10 percent of Si, 0.10 to 0.60 percent of Mn, less than or equal to 0.030 percent of P, 0.020 to 0.040 percent of S, 0.010 to 0.070 percent of Als, less than or equal to 0.01 percent of N, 0.020 to 0.060 percent of Ti, and the balance of Fe and inevitable impurities; B. smelting the raw materials and casting the raw materials into a plate blank; C. heating, dephosphorizing, hot rolling and laminar cooling the plate blank to obtain a hot rolled coil; D. pickling the hot rolled coil, and cold rolling the pickled hot rolled coil into a steel strip; E. and continuously annealing the cold-rolled steel strip, and then cold-rolling the cold-rolled steel strip into the enameled steel plate.
Description
Technical Field
The invention relates to the technical field of enamel steel production.
Background
With the technical progress and innovation development of the household appliance industry, enamel steel is continuously developed and gradually widely applied as a metal-based composite material widely applied to the household appliance industry. The inner container of the water heater is generally produced by hot-rolled enamel steel or cold-rolled B microalloyed low-carbon aluminum killed steel DC01EK, but the hot-rolled enamel steel generally has the problem of low scale explosion resistance sensitivity and is easy to have scale explosion defects, the requirement of reducing the thickness of the inner container is difficult to meet according to the limitation of the pressure resistance of the inner container of the water heater and the like on DC01EK, the cost is equivalent to DC01EK, and the cold-rolled enamel steel with higher strength is developed for reducing the thickness of the inner container of the water heater, so the high-strength cold-rolled enamel steel has wide market prospect.
CN106560523B discloses 260 MPa-grade cold-rolled continuous annealing enamel steel and a production method thereof, wherein the 260 MPa-grade cold-rolled continuous annealing enamel steel comprises the following chemical components in percentage by weight: c: 0.020-0.060%, Si is not more than 0.030%, Mn: 0.020-0.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Al: 0.020 to 0.060%, B: 0.0015-0.0040%, N: 0.0040-0.0100% and the balance of Fe and inevitable impurity elements. The cold-rolled enamel steel for the water heater liner with the strength level of 260MPa is produced through the processes of thin slab continuous casting and rolling, cold rolling, continuous annealing process and flattening. The hot rolling finishing temperature is controlled to be 860-960 ℃, and the coiling temperature is controlled to be 600-650 ℃. The cold rolling reduction rate is more than or equal to 70%, continuous annealing is adopted, the annealing temperature is 730-780 ℃, and the annealing time is 90-150 s. The produced cold-rolled steel plate has a microstructure of ferrite and dispersed carbide, the yield strength of the mechanical property is more than or equal to 260MPa, the tensile strength is more than or equal to 360MPa, and the elongation A50 is more than or equal to 35%.
CN111945059A discloses a preparation method of cold-rolled high-strength heat-resistant enamel steel, which comprises the following chemical components in percentage by weight: 0.04-0.07% of C, less than or equal to 0.03% of Si, Mn: 0.40-0.80%, P is less than or equal to 0.025%, S is less than or equal to 0.020%, Alt is less than or equal to 0.030%, Cr: 0.15-0.40%, Mo: 0.05-0.15%, N: 0.004-0.010% and the balance of Fe and inevitable impurity elements. The hot rolling finishing temperature is controlled to be 880-920 ℃, and the coiling temperature is controlled to be 580-640 ℃. The cold rolling reduction rate is more than or equal to 65 percent, a cover type annealing process is adopted, the annealing temperature is 660-700 ℃, and the heat preservation time is 8-10 h.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production method of cold-rolled enamel steel with good fishscale resistance and forming performance and yield strength of 300 MPa.
The technical scheme adopted by the invention for solving the technical problems is as follows: the production method of the cold-rolled enamel steel with the yield strength of 300MPa comprises the following steps:
A. the raw material components by weight percentage are as follows: 0.01 to 0.08 percent of C, less than or equal to 0.10 percent of Si, 0.10 to 0.60 percent of Mn, less than or equal to 0.030 percent of P, 0.020 to 0.040 percent of S, 0.010 to 0.070 percent of Als, less than or equal to 0.01 percent of N, 0.020 to 0.060 percent of Ti, and the balance of Fe and inevitable impurities;
B. smelting the raw materials and casting the raw materials into a plate blank;
C. heating, dephosphorizing, hot rolling and laminar cooling the plate blank to obtain a hot rolled coil;
D. pickling the hot rolled coil, and cold rolling the pickled hot rolled coil into a steel strip;
E. and continuously annealing the cold-rolled steel strip, and then cold-rolling the cold-rolled steel strip into the enameled steel plate.
Further, for step B, pyrite and titanium sponge are added during smelting.
Further, in the step C, the finish rolling start temperature during hot rolling is 1000-1100 ℃, the finish rolling temperature during hot rolling is 860-900 ℃, and the coiling temperature is 600-650 ℃.
Further, in the step D, the cold rolling reduction is 60-80%.
Further, in the step E, the annealing temperature is 780-820 ℃, the slow cooling end point temperature is 580-620 ℃, the fast cooling end point temperature is 300-360 ℃, the overaging section temperature is 340-400 ℃, and the leveling elongation is 0.5-1.8%.
The invention has the beneficial effects that: the high-strength cold-rolled enamel steel produced by the invention fully utilizes the characteristics of a continuous annealing unit, the smelting cost is lower, the surface quality of the produced product is excellent, the forming performance and the fish scale resistance are good, wherein the yield strength is 300-325 MPa, the tensile strength is 395-410 MPa, the elongation of A80 is 32.0-37.0%, the fatigue cycle frequency of a welding seam is more than 200 ten thousand times, and the fish scale resistance sensitivity TH value is 19.33-19.63 min/mm2。
Drawings
FIG. 1 is an organization chart of a first embodiment;
FIG. 2 is an organization chart of the second embodiment.
Detailed Description
The yield strength of 300MPa grade means that the yield strength is not lower than 300 MPa.
The production method of the cold-rolled enamel steel with the yield strength of 300MPa is suitable for the production of the enamel steel coil, and the chemical components (in weight percentage) range is as follows: 0.01 to 0.08 percent of C, less than or equal to 0.10 percent of Si, 0.10 to 0.60 percent of Mn, less than or equal to 0.030 percent of P, 0.020 to 0.040 percent of S, 0.010 to 0.070 percent of Als, less than or equal to 0.01 percent of N, 0.020 to 0.060 percent of Ti, and the balance of Fe and inevitable impurities. The mechanical property of the obtained finished product reaches 300-330 MPa of yield strength, 390-420 MPa of tensile strength, more than or equal to 32 percent of A80 elongation, good surface quality, better formability and excellent fish scaling resistance.
The design principle of the alloy composition of the invention is as follows:
carbon: c, one of the most important components in steel, determines the strength, plasticity and formability of the steel sheet. When C is low, the strength is low, while the r value is generally high, and the anisotropy is large; an excessively high C content is disadvantageous in weldability and formability. In order to obtain a lower r value, the alloy has good isotropy and simultaneously has welding and forming properties. Therefore, the content of C in the invention is 0.01-0.08%, preferably 0.30-0.60%.
Si: it is present in the steel as a residual element and is not added intentionally.
Mn: mn is a good deoxidizer and a good desulfurizer, forms MnS with S to be separated out in the continuous casting process of a casting blank, prevents the formation of FeS from causing corner cracks of the casting blank, is also a common solid solution strengthening element in steel, and can reduce the r value but obviously reduce the plasticity of the steel by increasing the content of Mn. Therefore, the Mn content of the present invention is 0.10 to 0.60%, preferably 0.30 to 0.45%.
Al: al plays a role in deoxidation and grain refinement in steel. The Al content of the invention is 0.010-0.070%, preferably 0.020-0.050%.
S: the sulfur-containing hydrogen storage material mainly exists in a sulfide form, the sulfide shows a beneficial effect in a certain range, and through increasing the S content, the precipitation of second phase particles such as TiS, Ti4C2S2 and the like is promoted to serve as a hydrogen storage trap, so that the fish scaling resistance is improved, and meanwhile, the fatigue performance can be improved along with the increase of sulfur. The S content of the invention is 0.020-0.040%, preferably 0.025-0.035%.
Ti: ti plays roles in fixing nitrogen, hindering recrystallization and obtaining fine grains in steel, and promotes the precipitation of second phase particles such as TiC, TiS, Ti (C, N), Ti4C2S2 and the like through the addition of Ti element, and the second phase particles are used as hydrogen storage traps to improve the fish scaling resistance, and simultaneously can inhibit the precipitation of large-size MnS to improve the fatigue performance and the forming performance. The solute dragging effect of Ti can inhibit the increase of texture strength and play a role in improving Delta r. The Ti content of the invention is 0.020-0.060%, preferably 0.030-0.050%.
The invention provides a preparation method of 300 MPa-grade cold-rolled enamel steel, which comprises the following specific processes:
(1) smelting: smelting according to the designed chemical components, adding pyrite and sponge titanium in a refining process, and then casting into a plate blank;
(2) a hot rolling procedure: heating, dephosphorizing, hot rolling and laminar cooling the casting blank to obtain a hot rolled coil, wherein the finish rolling start temperature is 1000-1100 ℃, the finish rolling temperature is 860-900 ℃, and the coiling temperature is 600-650 ℃;
(3) acid rolling process: carrying out acid washing on the hot rolled coil, and carrying out cold rolling to obtain cold-rolled thin strip steel, wherein the cold rolling reduction rate is 60-80%;
(4) a continuous annealing process: continuously annealing the cold-rolled thin strip steel to prepare a required high-strength cold-rolled enameled steel plate; the annealing temperature is 780-820 ℃, the slow cooling end point temperature is 580-620 ℃, the fast cooling end point temperature is 300-360 ℃, the overaging section temperature is 340-400 ℃, and the flat elongation is 0.5-1.8%.
According to the patent, through micro-titanium treatment, solid-solution nitrogen is fully fixed in a TiN form during hot rolling, and is precipitated during continuous annealing so as to inhibit the recrystallization of ferrite and the growth of grains during continuous annealing, the strength of steel can be improved, hot rolling is coiled at a lower temperature, a hot rolling structure is refined, so that after cold rolling recrystallization annealing, the grains are thinner, and higher yield strength is obtained. When the reduction ratio of 60% to 80% is used in cold rolling, a trace amount of titanium inhibits recrystallization of the steel sheet, and the orientation strength between {001} <110> and {112} <110> in the alpha-fiber texture of the steel sheet is significantly enhanced.
The parameters and reasons of the continuous annealing process selected by the invention are as follows: after welding and cleaning, the chilled base plate enters a continuous annealing furnace, and rapid heating is adopted for annealing in a critical zone to avoid coarsening of crystal grains after annealing; the temperature of the soaking section is set to be 780-820 ℃, the heat preservation time is 100-180 s, and the preferable temperature is 790-810 ℃ from the viewpoint of equipment requirements and economy of the continuous annealing unit; the slow cooling end point temperature is 580-620 ℃, the content of solid-solution carbon in steel and gamma → alpha conversion are controlled through the cooling rate, the {111} texture is fully developed, and the strip steel is ensured to have a higher r value; the final temperature of the rapid cooling section is 300-360 ℃, the cooling speed of the rapid cooling section is more than 45 ℃/s, the solid solution C content in the steel before overaging is ensured, cementite precipitated in ferrite grains in the subsequent overaging section is used as a hydrogen storage trap, and the solid solution carbon content in a finished product is reduced, so that the elongation of the strip steel is improved. The preferred temperature is 330-350 ℃; the temperature of the overaging section is 350-380 ℃, and a large amount of cementite is promoted to be precipitated from the strip steel to be used as a hydrogen storage trap; the flat elongation is set to be 1.3-1.8% according to the thickness range of the strip steel, and the yield point elongation of the strip steel is eliminated.
The embodiment provides two groups of cold-rolled enameled pressed steel with the yield strength of 300MPa, and the chemical compositions of the cold-rolled enameled pressed steel are shown in Table 1;
TABLE 1300 MPa grade Cold-rolled enamelled Steel chemical composition (wt.%)
The preparation method of the cold-rolled enameled pressed steel with the yield strength of 300MPa comprises the following specific processes:
A. smelting: preparing an enameled steel slab with chemical components shown in Table 1 by a smelting process;
B. a hot rolling procedure: heating, dephosphorizing, hot rolling and laminar cooling the plate blank to obtain a hot rolled coil, wherein the specific hot rolling process parameters are shown in table 2;
main hot rolling technological parameters of cold-rolled enamel steel in grade 2300 MPa
| Numbering | The initial rolling temperature/. degree.C | Final Rolling temperature/. degree.C | Coiling temperature/. degree.C |
| 1 | 1066 | 875 | 649 |
| 2 | 1053 | 887 | 615 |
C. Acid rolling process: pickling the hot rolled coil, and cold rolling the hot rolled coil into thin strip steel, wherein the cold rolling reduction rate of the thin strip steel of the embodiment 1 with the thickness of 1.65mm is 72.5 percent; the cold rolling reduction of example 2, 1.5mm in thickness, was 75.0%;
D. continuous annealing process: the cold-rolled thin strip steel is processed by a continuous annealing process to be made into a required product, wherein the annealing temperature is 780-820 ℃, the slow cooling end point temperature is 580-620 ℃, the fast cooling end point temperature is 300-360 ℃, the overaging section temperature is 340-400 ℃, and the leveling elongation is 0.5-1.8%. Specific parameters of the continuous annealing process are shown in table 3:
main technological parameters of table 3300 MPa grade cold-rolled enamel steel continuous annealing
The microstructure of the cold-rolled enamel steel with the yield strength of 300MPa prepared by the process is shown in the figure 1 in the example 1, the microstructure of the cold-rolled enamel steel with the yield strength of 300MPa is shown in the figure 2 in the example 2, the performance of the cold-rolled enamel steel is tested according to GB/T228-2010 metal material room temperature tensile test method, the mechanical properties of the cold-rolled enamel steel are shown in the following table 4, the hydrogen permeation test is carried out by adopting European standard EN 10209-2013, and the results are shown in the table 5.
Mechanical properties of cold-rolled enamel steel in table 4300 MPa
Surface 5300 MPa grade cold-rolled enamel steel scale explosion resistance
| Numbering | Specimen thickness (mm) | Penetration time (min) | TH value (min/mm)2) |
| Example 1 | 1.64 | 52.09～52.79 | 19.37～19.63 |
| Example 2 | 1.48 | 42.51～42.82 | 19.41～19.55 |
The result shows that the microstructure of the cold-rolled enamel steel prepared by the invention consists of ferrite and a small amount of pearlite, the yield strength reaches more than 300MPa, and the scale explosion resistance sensitivity TH value reaches 19min/mm2As described above, the composition has excellent moldability and fishscale resistance.
Claims (5)
1. The production method of the cold-rolled enamel steel with the yield strength of 300MPa is characterized by comprising the following steps:
A. the raw material components by weight percentage are as follows: 0.01 to 0.08 percent of C, less than or equal to 0.10 percent of Si, 0.10 to 0.60 percent of Mn, less than or equal to 0.030 percent of P, 0.020 to 0.040 percent of S, 0.010 to 0.070 percent of Als, less than or equal to 0.01 percent of N, 0.020 to 0.060 percent of Ti, and the balance of Fe and inevitable impurities;
B. smelting the raw materials and casting the raw materials into a plate blank;
C. heating, dephosphorizing, hot rolling and laminar cooling the plate blank to obtain a hot rolled coil;
D. pickling the hot rolled coil, and cold rolling the pickled hot rolled coil into a steel strip;
E. and continuously annealing the cold-rolled steel strip, and then cold-rolling the cold-rolled steel strip into the enameled steel plate.
2. The production method of cold-rolled enamelled steel with a yield strength of 300MPa according to claim 1, characterized in that: for step B, ferro-sulphur and titanium sponge are added during smelting.
3. The production method of cold-rolled enamelled steel with a yield strength of 300MPa according to claim 1, characterized in that: and C, finishing rolling at the beginning of hot rolling at 1000-1100 ℃, finishing rolling at the end of hot rolling at 860-900 ℃ and coiling at 600-650 ℃.
4. The production method of cold-rolled enamelled steel with a yield strength of 300MPa according to claim 1, characterized in that: and D, cold rolling reduction rate is 60-80%.
5. The production method of cold-rolled enamelled steel with a yield strength of 300MPa according to claim 1, characterized in that: for the step E, the annealing temperature is 780-820 ℃, the slow cooling end point temperature is 580-620 ℃, the fast cooling end point temperature is 300-360 ℃, the overaging section temperature is 340-400 ℃, and the leveling elongation is 0.5-1.8%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354235A (en) * | 2022-09-30 | 2022-11-18 | 武汉钢铁有限公司 | High-surface high-precision high-strength enamel steel and production method thereof |
| CN115612941A (en) * | 2022-10-28 | 2023-01-17 | 武汉钢铁有限公司 | High-strength enamel steel and cold rolling manufacturing method thereof by using low-temperature annealing process |
| CN116200651A (en) * | 2022-09-07 | 2023-06-02 | 包头钢铁（集团）有限责任公司 | 260MPa grade cold-rolled enamel steel for stamping and manufacturing method thereof |
| CN116219298A (en) * | 2022-12-20 | 2023-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing cold-rolled enamelled steel sheet with good reaming performance by smelting semisteel |
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| KR20140055468A (en) * | 2012-10-31 | 2014-05-09 | 현대제철 주식회사 | Cold-rolled steel sheet for enamel and method of manufacturing the same |
| CN111074140A (en) * | 2017-12-27 | 2020-04-28 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled low-carbon enamel steel for household appliances |
| CN110079731A (en) * | 2019-04-30 | 2019-08-02 | 马鞍山钢铁股份有限公司 | A kind of 260MPa grades of enamel cold-rolled steel sheet and its production method |
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| CN115354235B (en) * | 2022-09-30 | 2023-01-24 | 武汉钢铁有限公司 | High-surface high-precision high-strength enamel steel and production method thereof |
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