CN115595499A - High-strength hot-rolling acid-washing enameled steel strip with excellent fish scaling resistance and preparation method thereof - Google Patents
High-strength hot-rolling acid-washing enameled steel strip with excellent fish scaling resistance and preparation method thereof Download PDFInfo
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- CN115595499A CN115595499A CN202211042183.4A CN202211042183A CN115595499A CN 115595499 A CN115595499 A CN 115595499A CN 202211042183 A CN202211042183 A CN 202211042183A CN 115595499 A CN115595499 A CN 115595499A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 241000251468 Actinopterygii Species 0.000 title claims abstract description 15
- 238000005406 washing Methods 0.000 title claims description 11
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000005098 hot rolling Methods 0.000 title description 2
- 238000005096 rolling process Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 16
- 239000001257 hydrogen Substances 0.000 claims abstract description 16
- 229910052796 boron Inorganic materials 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005554 pickling Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 210000003298 dental enamel Anatomy 0.000 abstract description 31
- 239000002245 particle Substances 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 7
- 238000003860 storage Methods 0.000 abstract description 7
- 229910052802 copper Inorganic materials 0.000 abstract description 4
- 230000002706 hydrostatic effect Effects 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 11
- 239000010936 titanium Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 238000004880 explosion Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910004283 SiO 4 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000004534 enameling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052609 olivine Inorganic materials 0.000 description 2
- 239000010450 olivine Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/56—Elongation control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a high-strength hot-rolled pickled enamel steel strip with excellent fish scaling resistance and a preparation method thereof, wherein the high-strength hot-rolled pickled enamel steel strip comprises the following chemical components in percentage by weight: 0.08 to 0.20 percent of C, less than or equal to 0.08 percent of Si, 0.80 to 1.80 percent of Mn, less than or equal to 0.018 percent of P, 0.010 to 0.035 percent of S, 0.04 to 0.09 percent of Ti, 0.0005 to 0.0040 percent of B, less than or equal to 0.0065 percent of N, and the balance of Fe and inevitable residual elements. The steel strip and the method redesign the components, and avoid using noble alloys such as Cu, cr, ni, mo and the like through reasonable collocation of C, mn, S, ti and B; meanwhile, the rolling process is improved, and rich dislocation and second-phase particles are accumulated in a finished product by accurately controlling the deformation temperature and the deformation amount in the rolling process, so that enough hydrogen storage traps are formed in the steel, and the steel has high strength and excellent anti-fishscaling performance. The yield strength of the steel strip is more than or equal to 550MPa, the tensile strength is 650-800 MPa, the elongation is more than or equal to 23.0 percent, and the hydrogen permeation time is more than 25 min; has the characteristics of high strength and light weight, can bear the hydrostatic pressure of a large load.
Description
Technical Field
The invention relates to enamel steel and a preparation method thereof, in particular to a high-strength hot-rolled acid-washing enamel steel strip with excellent fish scaling resistance and a preparation method thereof.
Background
The large-scale assembled tank body is widely used for facilities such as resident living water treatment, industrial sewage treatment, grain storage and the like, and the tank body is in service in outdoor open air and complex weak corrosion stress environment for a long time, so that the supplied steel plate has high strength of more than 500MPa, can bear hydrostatic pressure of larger load, and creates conditions for reducing the self structural weight of the tank body. In addition, the steel sheet is required to have good fishscaling resistance due to long-term service in a weak corrosion stress environment.
The enamel steel produced by the prior art generally adopts lower carbon and nitrogen, controls the proportion of Ti, S and C, and utilizes MnS, tiC and Ti 4 C 2 S 2 The second phase particles are used as irreversible hydrogen storage traps of steel to delay the permeation time of hydrogen so as to obtain betterThe fish scaling resistance of (1). However, the precipitated second phase particles of the steel are aggregated and grown to different degrees with the rise of the enameling firing temperature and the extension of the holding time, and then the precipitation strengthening effect of the second phase of the steel is affected, so that the strength of the steel is generally below 400 MPa.
The patent application with the publication number CN112063932A discloses a hot-rolled enamel steel for deep drawing and a manufacturing method thereof, which provides the following chemical components in percentage: less than 0.01 percent of C, less than or equal to 0.05 percent of Si, 0.10 to 0.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 0.01 to 0.08 percent of Ti, 0.01 to 0.07 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 4 percent of Ti/N, less than or equal to 10 percent of Ca. The enamel steel adopts the design of ultra-low carbon and nitrogen, so that the enamel steel has good deep drawing and forming performances, but the hot-rolled yield of the steel plate produced according to the provided scheme is 359-402 MPa, the tensile strength is 447-483 MPa, the strength is limited, and the enamel steel can not be used for manufacturing large-scale assembled tank bodies with higher strength.
The patent application with the publication number of CN110284070B discloses '260 MPa-grade hot-rolled acid-washed enamel steel and a production method thereof', which comprises the following chemical components in percentage: c:0.030-0.060%, si is not more than 0.030%, mn: 0.30-0.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, als: less than or equal to 0.060%, B:0.0015 to 0.0040%, N:0.0040 to 0.0100 percent, and the balance of Fe and inevitable impurity elements. The enamel steel is designed by adopting conventional low-carbon components, a proper amount of alloy elements such as Mn, B and the like are added into the steel, the alloy cost is controlled economically, but the strength of hot-rolled steel is limited, the yield strength is only 274-298 MPa, the strength can be further reduced after enameling, the steel is only suitable for manufacturing the inner container of a common water heater, and the application range is limited.
The patent application with publication number CN102251192A provides an enamel steel and a manufacturing method thereof, and the cold-rolled enamel steel plate with excellent forming performance and anti-fishscaling performance is obtained by taking ultra-low carbon as a base and adding a plurality of alloy elements, and the chemical components of the cold-rolled enamel steel plate are as follows: less than or equal to 0.05 percent of C, less than or equal to 0.060 percent of Si, less than or equal to 0.50 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.031-0.10 percent of Al, less than or equal to 0.015 percent of N, more than or equal to 0.001 percent of O, 0.0003-0.020 percent of B, 0.01-0.50 percent of Cu, one or more than two of 0.01-0.10 percent of Nb, 0.01-0.10 percent of V and 0.01-0.15 percent of Ti, and one or more than two of 0.01-0.10 percent of Cr, 0.01-0.10 percent of Ni and 0.01-0.10 percent of Mo. The enamel steel produced by the method has better scale explosion resistance, but a large amount of various noble alloys such as Cu, cr, ni, mo and the like are added into the steel, so that the smelting production cost is greatly increased, the component segregation and crack control difficulty in the continuous casting and rolling process is also high, and the market application prospect of the steel is unknown.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-strength hot-rolled pickled enameled steel strip with excellent fish scaling resistance; the invention also provides a preparation method of the high-strength hot-rolled pickled enameled steel strip with excellent fish scaling resistance.
In order to solve the technical problems, the invention adopts the following chemical components in percentage by weight: 0.08 to 0.20 percent of C, less than or equal to 0.08 percent of Si, 0.80 to 1.80 percent of Mn, less than or equal to 0.018 percent of P, 0.010 to 0.035 percent of S, 0.04 to 0.09 percent of Ti, 0.0005 to 0.0040 percent of B, less than or equal to 0.0065 percent of N, and the balance of Fe and inevitable residual elements.
The yield strength of the enameled pressed steel is more than or equal to 550MPa, the tensile strength is 650-800 MPa, the elongation is more than or equal to 23.0%, and the hydrogen permeation time is more than or equal to 25min.
The function of the alloy elements in the invention is mainly based on the following principle:
c: carbon is an effective interstitial solid solution strengthening element and plays a role in balancing strength and formability in enamel steel. Meanwhile, carbon is TiC and Ti4C 2 S 2 The quantity and proportion of the second phase precipitated particles are determined by the content of carbon in the second phase precipitated particle synthetic elements, and the second phase precipitated particle synthetic elements have important influence on the fish scaling resistance of the enamel steel. Too high a carbon content deteriorates the formability of the enamel steel, and too low a carbon content results in insufficient strength and fishscaling resistance of the steel. Therefore, the carbon content in the present invention is controlled to be 0.08 to 0.20%.
Si: the silicon mainly plays a role in deoxidation in the smelting process and is used for controlling the oxide inclusions. However, the high Si content in the steel leads to poor welding performance, and the excessive Si is easy to combine with Fe and O elements to generate eutectic compound iron olivine in the rolling processStone Fe 2 SiO 4 Iron olivine Fe 2 SiO 4 FeO can be pinned and is difficult to remove through high-pressure descaling, so that the surface quality is influenced. Therefore, the invention requires that the silicon content is less than or equal to 0.08 percent, and preferably between 0.005 and 0.08 percent.
Mn: manganese is combined with sulfur in the enamel steel to generate fine MnS which is an effective hydrogen storage trap and has important influence on improving the scale explosion resistance of the steel, and simultaneously, the manganese is a replacement solid solution element and can improve the strength and the hardenability of the steel. However, excessive addition of Mn to steel causes segregation of Mn element, deteriorating the formability of steel. Therefore, the Mn content of the invention is controlled between 0.80 and 1.80 percent.
P: the scale is an easily segregated element, and the excessive scale can increase the brittleness of the steel and is a harmful element of the enamel steel. Therefore, the present invention requires that P be controlled to 0.018% or less.
S: sulfur is combined with Mn in steel to generate fine MnS which is a good hydrogen trap and can improve the fish scaling resistance of enamel steel. However, too high S content increases the hot brittleness of the steel and deteriorates the formability of the steel. Therefore, the S content of the invention is controlled between 0.10 and 0.035 percent.
Ti: titanium is combined with C and N in steel to precipitate fine TiC and Ti in the rolling and cooling processes 4 C 2 S 4 And TiN second phase particles play a role in precipitation strengthening on one hand, and can delay the permeation time of hydrogen and effectively improve the fish scaling resistance of steel as a hydrogen storage trap of the steel on the other hand. However, excessive Ti combines with N to form large-sized TiN inclusions, which affect cold formability of the steel. Therefore, the Ti content of the invention is controlled between 0.04 and 0.09 percent.
B: boron and a proper amount of N in the steel are combined to generate fine BN which is used as a hydrogen trap of the steel, and the fish scaling resistance of the steel can be effectively improved. But excessive boron increases the risk of crack formation during slab casting and rolling. Therefore, the content of B in the present invention is preferably controlled to be 0.0005 to 0.0040%.
N: trace N in the steel can be combined with Ti and B to generate fine TiN and BN, and the fine TiN and BN are used as hydrogen trapping traps of the steel, so that the scale explosion resistance of the steel is improved. However, excessive N deteriorates the plasticity and cold formability of the steel. Therefore, the N content of the invention is preferably controlled within 0.0065%, and preferably 0.0010% -0.0065%.
The method comprises the working procedures of heating the plate blank, rolling control, cooling control and acid pickling;
the controlled rolling process comprises the following steps: the initial rolling temperature of rough rolling is 1050-1180 ℃, the accumulated reduction rate of rough rolling is 70-98%, the inlet temperature of finish rolling is 910-1030 ℃, the accumulated reduction rate of finish rolling is 55-92%, and the final rolling temperature is 800-885 ℃;
the controlled cooling process comprises the following steps: the back section is adopted to be cooled at intervals, and the strip steel is cooled to 620-750 ℃ at the cooling speed of 5-40 ℃/s for coiling.
The acid washing process of the method comprises the following steps: a push-pull or continuous pickling line is adopted, the concentration of free acid in the pickling solution is 75-180 g/L, the temperature of the acid solution is 60-95 ℃, and the pickling speed is 35-180 m/min.
The method of the invention comprises the following slab heating process: the heating temperature is 1120-1200 ℃, the total heating time in the heating furnace is 120-300 min, and the retention time in the soaking section is 30-80 min.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1) The invention redesigns the components of the common enamel steel, avoids using noble alloys such as Cu, cr, ni, mo and the like through reasonable collocation of C, mn, S, ti and B, and realizes high strength and excellent fish scaling resistance under the condition of lower production cost.
2) The invention improves the rolling process, and ensures that the finished product accumulates abundant dislocation and second phase particles by accurately controlling the deformation temperature and the deformation amount in the rolling process, thereby forming enough hydrogen storage traps in the steel, and ensuring that the steel has high strength and excellent fish scaling resistance. The yield strength of the enamel steel obtained by the method is more than or equal to 550MPa, the tensile strength is 650-800 MPa, the elongation is more than or equal to 23.0 percent, and the enamel steel has ultrahigh strength in the enamel steel product series; the hydrogen permeation time of the common enamel steel is about 18min, and the hydrogen permeation time of the enamel steel obtained by the method of the invention reaches more than 25min, so that the enamel steel has better anti-scaling performance compared with the common enamel steel.
3) The high-strength hot-rolled acid-washing enameled steel has the characteristics of high strength and light weight, can bear the hydrostatic pressure of a larger load, can be safely used outdoors in a weak corrosion stress environment for a long time, and is widely applied to large-scale assembled tank facilities for domestic water treatment, industrial sewage treatment, grain storage and the like.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Examples 1 to 8: the high-strength hot-rolled pickled enameled steel strip with excellent fish scaling resistance and the preparation method thereof are concretely described as follows.
(1) The preparation method of the enameled pressed steel comprises the working procedures of plate blank heating, controlled rolling, controlled cooling and acid washing which are sequentially carried out. The slab heating process is carried out at the heating temperature of 1120-1200 ℃, the total heating time of 120-300 min in the heating furnace and the retention time of 30-80 min in the soaking section. The rolling process is controlled, the initial rolling temperature of rough rolling is 1050-1180 ℃, the accumulated reduction rate of rough rolling is 70-98%, the inlet temperature of finish rolling is 910-1030 ℃, the accumulated reduction rate of finish rolling is 55-92%, and the final rolling temperature is 800-885 ℃. And in the controlled cooling process, the back-end grouped interval cooling is adopted, namely the odd group and the even group of cooling water of adjacent collecting pipes at the back end of laminar cooling are opened or the odd group and the even group are closed, and the strip steel is cooled to 620-750 ℃ at the cooling speed of 5-40 ℃/s and then coiled. The acid washing process adopts a push-pull type or continuous acid washing line, the concentration of free acid in acid washing liquid is 75-180 g/L, the temperature of the acid liquid is 60-95 ℃, and the acid washing speed is 35-180 m/min. The technological parameters of the slab heating and controlled rolling process described in each example are shown in table 1; the process parameters for controlling the cooling and pickling steps described in the examples are shown in table 2.
Table 1: heating of slabs and controlling of process parameters of rolling process
Table 2: controlling process parameters of cooling and pickling processes
(2) The specific chemical composition contents of the high-strength hot-rolled pickled enameled steel strip obtained in each example are shown in Table 3.
Table 3: chemical composition (wt%) of enamel steel strip
In table 3, the balance of the chemical composition is Fe and inevitable residual elements.
(3) The mechanical properties of the high-strength hot-rolled pickled enameled steel strip obtained in each example are as follows: the yield strength is 592-657 MPa, the tensile strength is 667-756 MPa, and the elongation is 26.1-35.6%; the hydrogen permeation time in the scale explosion resistance test is 29-56 min, the surfaces of the examples 1-8 have no scale explosion defect after the test, and the scale explosion resistance performance is excellent; the mechanical properties of the enamelled steel strip obtained in each example are shown in Table 4.
Table 4: mechanical property of enamel steel strip
Claims (5)
1. A high-strength hot-rolled acid-washing enameled steel strip with excellent fish scaling resistance is characterized by comprising the following chemical components in percentage by weight: 0.08 to 0.20 percent of C, less than or equal to 0.08 percent of Si, 0.80 to 1.80 percent of Mn, less than or equal to 0.018 percent of P, 0.010 to 0.035 percent of S, 0.04 to 0.09 percent of Ti, 0.0005 to 0.0040 percent of B, less than or equal to 0.0065 percent of N, and the balance of Fe and inevitable residual elements.
2. The high-strength hot-rolled pickled enameled steel strip excellent in fishscaling resistance according to claim 1, characterized in that: the yield strength of the enameled steel strip is more than or equal to 550MPa, the tensile strength is 650-800 MPa, the elongation is more than or equal to 23.0%, and the hydrogen permeation time is more than or equal to 25min.
3. A method for producing a high-strength hot-rolled pickled enameled steel strip with excellent fishscale resistance as defined in claim 1 or 2, characterized in that: comprises the working procedures of heating a plate blank, rolling control, cooling control and acid pickling;
the controlled rolling process comprises the following steps: the initial rolling temperature of rough rolling is 1050-1180 ℃, the accumulated reduction rate of rough rolling is 70-98%, the inlet temperature of finish rolling is 910-1030 ℃, the accumulated reduction rate of finish rolling is 55-92%, and the final rolling temperature is 800-885 ℃;
the controlled cooling process comprises the following steps: the back section is adopted to be cooled at intervals, and the strip steel is cooled to 620-750 ℃ at the cooling speed of 5-40 ℃/s for coiling.
4. The method for producing a high-strength hot-rolled pickled enameled steel strip excellent in fishscale resistance as claimed in claim 3, wherein the pickling process comprises: a push-pull or continuous pickling line is adopted, the concentration of free acid in the pickling solution is 75-180 g/L, the temperature of the acid solution is 60-95 ℃, and the pickling speed is 35-180 m/min.
5. The method for producing a high-strength hot-rolled pickled enameled steel strip excellent in fishscale resistance according to claim 3 or 4, characterized in that the slab heating step: the heating temperature is 1120-1200 ℃, the total heating time in the heating furnace is 120-300 min, and the retention time in the soaking section is 30-80 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211042183.4A CN115595499B (en) | 2022-08-29 | 2022-08-29 | High-strength hot-rolled pickled enamel steel strip with excellent anti-scaling performance and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211042183.4A CN115595499B (en) | 2022-08-29 | 2022-08-29 | High-strength hot-rolled pickled enamel steel strip with excellent anti-scaling performance and preparation method thereof |
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| CN110343964A (en) * | 2019-07-30 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of yield strength is greater than the enamel cold-rolled steel sheet and its production method of 500MPa |
| CN113198851A (en) * | 2021-03-18 | 2021-08-03 | 日照钢铁控股集团有限公司 | Production method of hot-rolled pickled sheet of enamel steel |
| CN113832392A (en) * | 2021-08-02 | 2021-12-24 | 敬业钢铁有限公司 | Cold-rolled steel plate for enamel and production method thereof |
| CN114231846A (en) * | 2021-12-03 | 2022-03-25 | 日照钢铁控股集团有限公司 | Titanium-boron composite hot-rolled enamel steel for water heater liner and preparation method thereof |
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| KR20000019786A (en) * | 1998-09-15 | 2000-04-15 | 이구택 | Manufacturing method of hot rolled steel sheet for double-sided enamel porcelain having excellent fish scale resistance |
| CN101063189A (en) * | 2006-04-29 | 2007-10-31 | 宝山钢铁股份有限公司 | Hot-rolled fine-grained steel for electrostatic enamel and manufacturing method thereof |
| JP2011111675A (en) * | 2009-11-30 | 2011-06-09 | Nippon Steel Corp | HIGH STRENGTH STEEL SHEET EXCELLENT IN HYDROGEN EMBRITTLEMENT RESISTANCE AND HAVING THE MAXIMUM TENSILE STRENGTH OF >=900 MPa, METHOD FOR PRODUCING HIGH STRENGTH COLD ROLLED STEEL SHEET, AND METHOD FOR PRODUCING HIGH STRENGTH GALVANIZED STEEL SHEET |
| CN102899560A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Steel plate used for glass lining and production method thereof |
| CN105177411A (en) * | 2015-08-07 | 2015-12-23 | 华北理工大学 | Boracic cold-rolled enamel steel suitable for continuous annealing production and manufacturing method of boracic cold-rolled enamel steel |
| CN110343964A (en) * | 2019-07-30 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of yield strength is greater than the enamel cold-rolled steel sheet and its production method of 500MPa |
| CN113198851A (en) * | 2021-03-18 | 2021-08-03 | 日照钢铁控股集团有限公司 | Production method of hot-rolled pickled sheet of enamel steel |
| CN113832392A (en) * | 2021-08-02 | 2021-12-24 | 敬业钢铁有限公司 | Cold-rolled steel plate for enamel and production method thereof |
| CN114231846A (en) * | 2021-12-03 | 2022-03-25 | 日照钢铁控股集团有限公司 | Titanium-boron composite hot-rolled enamel steel for water heater liner and preparation method thereof |
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| CN115595499B (en) | 2023-10-31 |
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