CN117488185A - Steel plate for enamel, preparation method of steel plate, enamel steel and enamel spliced tank - Google Patents

Steel plate for enamel, preparation method of steel plate, enamel steel and enamel spliced tank Download PDF

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Publication number
CN117488185A
CN117488185A CN202311438655.2A CN202311438655A CN117488185A CN 117488185 A CN117488185 A CN 117488185A CN 202311438655 A CN202311438655 A CN 202311438655A CN 117488185 A CN117488185 A CN 117488185A
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China
Prior art keywords
enamel
steel
steel sheet
cooling
steel plate
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CN202311438655.2A
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Chinese (zh)
Inventor
张志敏
王小勇
刘广会
李新
刘金刚
罗衍昭
武卫阳
田鹏
徐海卫
韩赟
狄国标
刘再旺
杨赵军
李阳
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Shougang Group Co Ltd
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Shougang Group Co Ltd
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Priority to CN202311438655.2A priority Critical patent/CN117488185A/en
Publication of CN117488185A publication Critical patent/CN117488185A/en
Pending legal-status Critical Current

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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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C22C38/04—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • C21D2211/002—Bainite
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • 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)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention provides a steel plate for enamel, a preparation method thereof, enamel steel and an enamel spliced tank. The steel sheet for enamelThe chemical components comprise: C. si, mn, P, S, alt, ti, nb, N and Fe; the content of C is 0.16 to 0.22 percent, the content of Si is 0.3 to 0.5 percent, the content of Mn is 2.4 to 3 percent and the content of P is calculated according to mass fraction<0.015%, S content<0.005%, alt 0.02% -0.08%, ti 0.13% -0.25%, nb 0.02% -0.07%, N<0.005%; wherein, the mass fraction of Ti and S satisfies the following relation: [ Ti]/[S]Not less than 26, in [ Ti ]]Represents the mass fraction of Ti, [ S ]]Representing the mass fraction of S. The bainite structure is formed by reasonably designing chemical components and a rolling process, tiC and NbC precipitated phases are dispersed in the matrix, and the high strength of the steel plate for enamel is ensured. The yield strength of the enamelled steel plate is more than or equal to 660MPa, the enamelled steel plate can resist high Wen Tang firing, and the water storage capacity can be 25000m 3 The oversized enamel spliced tank.

Description

Steel plate for enamel, preparation method of steel plate, enamel steel and enamel spliced tank
Technical Field
The application relates to the technical field of steel preparation, in particular to a steel plate for enamel, a preparation method thereof, enamel steel and an enamel spliced tank.
Background
The large enamel spliced tank is applied to facilities such as water treatment, chemical environmental protection, bioenergy engineering and the like, along with the development of economy and society, the global environmental problems are increasingly serious, and the capacities of the sewage treatment tank, the water storage tank and the like are increasingly large. The larger the capacity of the enamel spliced can is, the larger the thickness of the required steel plate is, and the higher the strength is.
The thick steel plate has higher strength than the thin steel plate, firstly the reduction of the thick steel plate during hot rolling is small, and the high hot-rolled strength is difficult to obtain, and secondly the enameling time of the thick steel plate after enameling is longer than that of the thin steel plate, and the strength of the thick steel plate after enameling is reduced more. At present, the steel plate for the domestic large-scale enamel spliced tank is generally below 15mm in thickness and is mostly suitable for manufacturing the water storage capacity of 20000m 3 The tank below lacks 25000m of water storage capacity 3 The steel plate for the oversized enamel spliced tank. At present, enamel steel with the thickness of 16-20 mm is not available, so that a thick steel plate with high strength level is needed to be developed for manufacturing 25000m water storage capacity 3 The oversized enamel spliced tank.
Disclosure of Invention
The application provides a steel plate for enamel, a preparation method thereof, enamel steel and an enamel spliced tank for realizing water storage capacity of 25000m 3 The preparation of the high-strength (yield strength is more than or equal to 660 MPa) thick-specification (thickness is 16-20 mm) enamel steel plate for the extra-large tank.
In a first aspect, the present application provides a steel sheet for enamel, the microstructure of the steel sheet for enamel is bainite, and the chemical components of the steel sheet for enamel include: C. si, mn, P, S, alt, ti, nb, N and Fe; the alloy comprises, by mass, 0.16% -0.22% of C, 0.3% -0.5% of Si, 2.4% -3% of Mn, less than 0.015% of P, less than 0.0050% of S, 0.02% -0.08% of Alt, 0.13% -0.25% of Ti, 0.02% -0.07% of Nb and less than 0.005% of N;
wherein, the mass fraction of Ti and S satisfies the following relation: [ Ti ]/[ S ]. Gtoreq.26,
wherein [ Ti ] represents the mass fraction of Ti and [ S ] represents the mass fraction of S.
Optionally, precipitated phases of TiC and NbC are dispersed in the matrix of the enamelled steel plate, and the size of the precipitated phases is less than or equal to 50nm.
Optionally, the thickness of the steel plate for enamel is 16 mm-20 mm, and the steel plate for enamel meets the following performances: the yield strength is 660 MPa-750 MPa, the tensile strength is 710 MPa-880 MPa, the elongation after fracture A50mm is 20-35%, and the high-temperature enameling and burning resistance is 800-900 ℃.
In a second aspect, the present application provides a method for manufacturing an enamelled steel sheet according to any one of the embodiments of the first aspect, the method comprising:
obtaining a casting blank with the chemical composition;
and heating the casting blank, rolling in two stages and cooling in stages to obtain the enamelled steel plate.
Optionally, the staged cooling comprises a first stage cooling, a second stage cooling and a third stage cooling, wherein the cooling speed of the first stage cooling is 30 ℃/s-40 ℃/s; the cooling speed of the second-stage cooling is less than or equal to 20 ℃/s, and the final cooling temperature of the second-stage cooling is 470-540 ℃; and the third stage of cooling is air cooling to room temperature.
Optionally, the heating temperature is 1190-1260 ℃; the two-stage rolling comprises rough rolling and finish rolling, wherein the rough rolling is 5-7 times, the finish rolling is 5-7 times, and the finish rolling temperature of the finish rolling is 800-900 ℃.
In a third aspect, the present application provides an enamel steel, which comprises the steel sheet for enamel according to any one of the embodiments of the first aspect and an enamel layer provided on at least one plate surface of the steel sheet for enamel.
Optionally, the microstructure of the enamel steel comprises pearlite and ferrite, the grain size of the enamel steel is less than 5 μm, and newly precipitated phases of TiC and NbC are dispersed in the matrix of the enamel steel, and the size of the newly precipitated phases is less than 20nm.
Optionally, the enamel steel satisfies the following properties: the yield strength is 380 MPa-450 MPa, the tensile strength is 520 MPa-750 MPa, and the elongation after fracture A50mm is 28-47%.
In a fourth aspect, the present application provides an enamel mosaic tank, the water storage capacity of the enamel mosaic tank is more than or equal to 25000m 3 The enamel spliced tank comprises the metal structural component made of the enamel steel according to any embodiment of the third aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the steel plate for enamel forms a bainite structure through reasonable design of chemical components and a rolling process, tiC and NbC precipitated phases are dispersed in a matrix, and the steel plate for enamel is guaranteed to have high strength. At the same time, by the relation [ Ti]/[S]Not less than 26, adopts high Ti and low S components, avoids excessive S and Ti combination to generate Ti 4 C 2 S 2 Resulting in reduced formation of fine TiC, thereby avoiding a decrease in strength of the steel sheet.
In addition, the yield strength of the enamelled steel plate is more than or equal to 660MPa, the enamelled steel plate can resist high Wen Tang firing, and the water storage capacity can be 25000m 3 The oversized enamel spliced tank.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a method for manufacturing an enamel steel plate according to an embodiment of the present application;
fig. 2 is a photograph of a metallographic structure of an enamelled steel sheet provided in example 1 of the present application;
fig. 3 is a transmission electron microscope image of a precipitate of the enamelled steel sheet provided in example 1 of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Various embodiments of the present application may exist in a range format; it should be understood that the description in a range format is merely for convenience and brevity and should not be interpreted as a rigid limitation on the scope of the application. It is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In addition, in the description of the present application, the terms "include", "comprise", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, and the like used in this application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides a steel sheet for enamel, the microstructure of the steel sheet for enamel is bainite, and the chemical components of the steel sheet for enamel include: C. si, mn, P, S, alt, ti, nb, N and Fe; the alloy comprises, by mass, 0.16% -0.22% of C, 0.3% -0.5% of Si, 2.4% -3% of Mn, less than 0.015% of P, less than 0.0050% of S, 0.02% -0.08% of Alt, 0.13% -0.25% of Ti, 0.02% -0.07% of Nb and less than 0.005% of N;
wherein, the mass fraction of Ti and S satisfies the following relation: [ Ti ]/[ S ]. Gtoreq.26,
wherein [ Ti ] represents the mass fraction of Ti and [ S ] represents the mass fraction of S.
In some embodiments, controlling the content of C to be 0.16% to 0.22% has the positive effect: the solid solution carbon and the precipitated carbide provide strength for the steel plate, the precipitated TiC and NbC have the precipitation strengthening effect, the dispersed TiC and NbC particles can inhibit the growth of crystal grains, the fine crystal grains of the steel plate are ensured, the steel plate has high strength before and after enameling, particularly the precipitated TiC and NbC in the enameling process are ensured, the steel plate still has high strength after enameling, and meanwhile the TiC and NbC can be used as hydrogen traps to improve the anti-scaling performance of the steel plate. Too low carbon does not guarantee the strength of the steel, too high carbon is detrimental to the enameling process, resulting in defects of cells in the enameling process. The C content may be 0.16%, 0.17%, 0.18%, 0.20%, 0.22%, etc.
The positive effect of controlling the content of Si to be 0.3-0.5 percent: si is used as a deoxidizer for removing oxygen in molten steel, and the excessively high content of Si can reduce the adhesion of enamel and damage the surface quality. The Si content may be 0.3%, 0.4%, 0.5%, etc.
The positive effect of controlling the Mn content to be 2.4-3 percent: mn can refine the structure and reduce the size of the precipitated particles and the average spacing of the precipitated particles. Manganese is a solid solution strengthening element, can reduce the transformation temperature of austenite to ferrite, expands the hot working temperature area, is beneficial to refining the grain size and improves the yield strength and the tensile strength of steel. When the manganese content is too high, the strength is too high, which is unfavorable for the punching and arc bending process of the steel plate. The Mn content may be 2.4%, 2.5%, 2.6%, 2.8%, 3%, etc.
Positive effect of controlling P content < 0.015%: phosphorus is an impurity element and tends to gather in grain boundaries, which increases brittleness of the steel sheet and deteriorates formability of the steel sheet. Thus, the phosphorus content was controlled to 0.015% or less. The content of P may be 0.003%, 0.006%, 0.009%, 0.012% or the like.
Controlling the S content<0.005% positive effect: when the sulfur content is higher, the sulfur is easy to combine with Ti to generate Ti 4 C 2 S 2 ，Ti 4 C 2 S 2 The size of (C) is generally 100-400 nm, ti 4 C 2 S 2 Ti element is consumed, the generation of fine TiC is reduced, precipitation strengthening is weakened, the strength of the steel plate is reduced, and meanwhile, the anti-scaling performance of the steel plate is reduced. The S content may be 0.001%, 0.002%, 0.004%, etc.
The positive effect of controlling the content of Alt to be 0.02% -0.08%: aluminum is a strong deoxidizer, and can inhibit the formation of other oxides, aluminum reacts with oxygen to form aluminum oxide, the aluminum oxide has poor molding, and a large amount of aluminum oxide inclusions impair the workability of the steel sheet, so that a certain amount of aluminum is selected for deoxidization. The content of Alt may be 0.02%, 0.04%, 0.06%, 0.08%, etc.
The positive effect of controlling the Ti content to be 0.13-0.25 percent: ti and C form TiC, the TiC has precipitation strengthening effect, dispersed TiC particles can inhibit the growth of crystal grains, the crystal grains of the steel plate are ensured to be tiny, the strength of the steel plate is improved, meanwhile, tiC is a good hydrogen trap, and the anti-scaling performance of the steel plate is improved. Too high a titanium content increases costs. The Ti content may be 0.13%, 0.16%, 0.19%, 0.22%, 0.25%, etc.
The positive effect of controlling the Nb content to be 0.02% -0.07%: niobium is the most effective micro-alloying element for refining grains, in addition, nb and C form NbC, and the NbC has a precipitation strengthening effect, so that the strength of the steel plate is improved, and meanwhile, nbC is a good hydrogen trap, so that the anti-scaling performance of the steel plate is improved. Too high a niobium content increases costs. The content of Nb may be 0.02%, 0.03%, 0.04%, 0.06%, 0.07%, etc.
Positive effect of controlling N content < 0.005%: n is easy to form TiN with Ti, ti is preferentially combined with N to form TiN, then combined with C to form TiC, the size of the TiN is in the micron level, the size of the TiC is in the nanometer level, the contribution of the TiC to the strength and the hydrogen storage capacity are far higher than those of the TiN, so that Ti is expected to form TiC as much as possible instead of the TiN, and the N content is controlled to be as low as possible. The content of N may be 0.001%, 0.003%, 0.004%, etc.
The mass fractions of Ti and S elements are controlled to satisfy the following relational expression: [ Ti]/[S]Positive effects of ≡26: adopts high Ti and low S components, avoids excessive S and Ti combination to generate Ti 4 C 2 S 2 The generation of fine TiC is reduced, and precipitation strengthening is weakened, so that the reduction of the strength of the steel plate is avoided. [ Ti]/[S]The values of (2) may be 26, 27, 28, 29, 30, etc.
Meanwhile, the enamelled steel plate provided by the application is free from adding Cr, cu, mo, V, B and other elements, and is relatively low in cost.
In some embodiments, the precipitated phases of TiC and NbC are dispersed in the matrix of the enamelled steel sheet, and the size of the precipitated phases is less than or equal to 50nm.
In the application, the substrate of the steel plate for enamel has fine TiC and NbC particles, has the function of precipitation strengthening, can inhibit the growth of crystal grains, and ensures that the crystal grains of the steel plate for enamel are fine, thereby ensuring that the steel plate for enamel has high strength. The size of the precipitated phase may be 10nm, 20nm, 30nm, 40nm, 50nm, etc.
In some embodiments, the enamelled steel sheet satisfies the following properties: yield strength of 660-750 MPa, tensile strength of 710-880 MPa, elongation after break A 50mm 20-35%, and is resistant to high temperature enameling at 800-900 ℃.
The steel plate for enamel is a high-strength thick-specification steel plate and is resistant to high Wen Tang firing, and yield strength of the obtained enamel steel after high Wen Tang firing is reduced little. The yield strength may be 660MPa, 680MPa, 700MPa, 720MPa, 740MPa, 750MPa, etc.; the tensile strength can be 710MPa, 740MPa, 780MPa, 820MPa, 860MPa, 880MPa and the like; elongation after break A 50mm May be 20%, 25%, 30%, 35%, etc.; can resist the high temperature of 800 ℃, 830 ℃, 860 ℃, 880 ℃, 890 ℃, 900 ℃ and the like.
In some embodiments, the enamelled steel sheet has a thickness of 16mm to 20mm.
The enamel steel sheet in the present application is a thick steel sheet with high strength, and is used for manufacturing 25000m water storage capacity 3 The oversized enamel spliced tank. The thickness of the enameling sheet may be 16mm, 17mm, 18mm, 19mm, 20mm, etc.
In a second aspect, the present application provides a method for manufacturing an enamelled steel sheet according to any one of the embodiments of the first aspect, referring to fig. 1, the method includes:
s1, obtaining the casting blank with the chemical components.
In some embodiments, the step S1 is preceded by pretreatment of molten iron, converter smelting, and refining.
And S2, heating the casting blank, rolling in two stages and cooling in stages to obtain the steel plate for enamel.
In some embodiments, the temperature of the heating is 1190 ℃ to 1260 ℃; the two-stage rolling comprises rough rolling and finish rolling, wherein the rough rolling is 5-7 times, the finish rolling is 5-7 times, and the finish rolling temperature of the finish rolling is 800-900 ℃.
The heating temperature is controlled to be 1190-1260 ℃, so that on one hand, a uniform austenite microstructure can be obtained, and on the other hand, precipitates such as TiC, nbC and the like in the plate blank are promoted to be dissolved back as much as possible, so that the re-precipitation and the formation of fine dispersed precipitated phases in the subsequent process steps are facilitated. The heating temperature may be 1190 ℃, 1210 ℃, 1230 ℃, 1245 ℃, 1260 ℃, etc.
The rough rolling is controlled to be 5-7 times, the finish rolling is controlled to be 5-7 times, and the finish rolling temperature is controlled to be 800-900 ℃, so that the steel plate has proper thickness and mechanical property. The rough rolling may be 5, 6, 7, the finish rolling may be 5, 6, 7, the finishing temperature may be 800 ℃, 820 ℃, 850 ℃,870 ℃, 900 ℃, etc.
In some embodiments, the staged cooling includes a first stage cooling, a second stage cooling, and a third stage cooling, the first stage cooling being ultra-fast cooling, the first stage cooling having a cooling rate of 30 ℃/s to 40 ℃/s; the cooling of the second stage is laminar cooling, the cooling speed of the second stage cooling is less than or equal to 20 ℃/s, and the final cooling temperature of the second stage cooling is 470-540 ℃; and the third stage of cooling is air cooling to room temperature.
The cooling speed of the first stage cooling is controlled to be 30-40 ℃ per second, the cooling speed of the second stage cooling is controlled to be less than or equal to 20 ℃ per second, and the final cooling temperature of the second stage cooling is controlled to be 470-540 ℃, so as to obtain a bainite structure and proper mechanical properties. The cooling rate of the first stage cooling may be 30 ℃/s, 32 ℃/s, 34 ℃/s, 36 ℃/s, 38 ℃/s, 40 ℃/s, etc.; the cooling rate of the second stage cooling may be 5 ℃/s, 7 ℃/s, 10 ℃/s, 12 ℃/s, 15 ℃/s, 20 ℃/s, etc., and the final cooling temperature of the second stage cooling may be 470 ℃, 490 ℃, 500 ℃, 520 ℃, 540 ℃, etc.
In a third aspect, the present application provides an enamel steel, which comprises the steel sheet for enamel according to any one of the embodiments of the first aspect and an enamel layer provided on at least one plate surface of the steel sheet for enamel.
In some embodiments, the enamel layer is provided on both plate surfaces of the enamel steel plate.
In some embodiments, the microstructure of the enamel steel comprises pearlite and ferrite, the grain size of the enamel steel is <5 μm, and the matrix of the enamel steel is dispersed with newly precipitated phases of TiC and NbC, and the size of the newly precipitated phases is <20nm.
TiC and NbC which are newly separated out in the enameling process ensure that the steel plate still has high strength after enameling, and meanwhile, tiC and NbC can be used as hydrogen traps to improve the anti-scaling performance of the steel plate. The grain size may be 3 μm, 4 μm, 4.5 μm, etc. The size of the newly precipitated phase may be 5nm, 10nm, 15nm, 19nm, etc.
In some embodiments, the enamel steel satisfies the following properties: yield strength is 380 MPa-450 MPa, tensile strength is 520 MPa-750 MPa, and elongation after break A 50mm 28% -47%.
The enamel steel provided by the application has high strength level and can be used for manufacturing water storage capacity 25000m 3 The oversized enamel spliced tank. The yield strength can be 380MPa, 400MPa, 420MPa, 435MPa, 450MPa and the like, the tensile strength can be 520MPa, 600MPa, 620MPa, 700MPa, 750MPa and the like, and the elongation after break A is that 50mm May be 28%, 35%, 40%, 45%, 47%, etc.
In a fourth aspect, the present application provides an enamel mosaic tank, the water storage capacity of the enamel mosaic tank is more than or equal to 25000m 3 The enamel spliced tank comprises the metal structural component made of the enamel steel according to any embodiment of the third aspect.
The preparation method of the enamelled steel sheet is realized based on the chemical components of the enamelled steel sheet and the hot rolling process, and the chemical components of the enamelled steel sheet can be specifically referred to the above embodiments.
The present application is further illustrated below in conjunction with specific examples. It should be understood that these examples are illustrative only of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Molten steels of examples 1 to 5 and comparative examples 1 to 3 were prepared and cast into cast slabs having chemical compositions shown in table 1.
TABLE 1 mass percent (wt%) of chemical components of examples and comparative examples, the balance being Fe and unavoidable impurities
Group of C Si Mn P S Alt Ti Nb N [Ti]/[S]
Example 1 0.16 0.45 2.4 0.010 0.0030 0.035 0.14 0.03 0.0048 46.67
Example 2 0.22 0.3 3 0.010 0.0034 0.030 0.21 0.07 0.0042 61.76
Example 3 0.17 0.5 2.5 0.009 0.0040 0.060 0.15 0.04 0.0026 37.50
Example 4 0.20 0.4 2.8 0.080 0.0045 0.033 0.19 0.06 0.0040 42.22
Example 5 0.18 0.35 2.6 0.011 0.0025 0.025 0.17 0.05 0.0033 68.00
Comparative example 1 0.16 0.45 2.4 0.010 0.0200 0.035 0.14 0.03 0.0048 7
Comparative example 2 0.17 0.5 2.5 0.009 0.0040 0.060 0.15 0.04 0.0026 37.50
Comparative example 3 0.16 0.45 2.4 0.010 0.0200 0.035 0.14 0.03 0.0048 7
Based on the chemical components of the steel sheet for enamel, the embodiment of the application provides a preparation method of the steel sheet for enamel, which comprises the following steps:
s11, obtaining a casting blank with the chemical components;
s21, heating the casting blank, two-stage rolling and stage cooling to obtain the steel plate for enamel, wherein main technological parameters are shown in Table 2.
Table 2 production process parameters of enamelled steel sheet
Based on the steel sheet for enamel, the embodiment of the application provides a preparation method of the enamel steel, which comprises the following steps: enameling and enameling are carried out on the enamelled steel plate for three times, wherein the enameling temperature is 870 ℃, and the total enameling time is 2.5 hours.
The mechanical properties of the enamelled steel sheet and enamelled steel were measured and the results are shown in Table 3.
TABLE 3 mechanical property results of enamelled Steel sheet and enamelled Steel
Detailed description of figures 2, 3:
fig. 2 is a photograph of a metallographic structure of an enamel steel sheet according to example 1 of the present application, and it can be seen from the drawing that the microstructure of the steel sheet is bainite.
FIG. 3 is a transmission electron microscopic image of a precipitate of the enamelled steel sheet according to example 1 of the present application, and it can be seen from the image that the particle size of the precipitated phases of titanium carbide and niobium carbide distributed in the steel is not more than 50nm.
In addition, one or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) In the embodiment of the invention, the thick enamel steel plate has high strength grade, high temperature resistance and enamel firing at 870 ℃ for 2.5 hours, and has the yield strength of 380-450 MPa and the tensile strength of 520-750 MPa.
(2) In the embodiment of the invention, the steel plate for enamel has good enamel performance and anti-scaling performance. The tank has large volume and can be used for manufacturing water storage capacity 25000m 3 The oversized enamel spliced tank.
(3) In the embodiment of the invention, the enamelled steel plate is not added with Cr, cu, mo, V, B and other elements, and the cost is relatively low.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An enamelled steel sheet, characterized in that the microstructure of the enamelled steel sheet is bainite, and the enamelled steel sheet comprises the following chemical components: C. si, mn, P, S, alt, ti, nb, N and Fe; the alloy comprises, by mass, 0.16% -0.22% of C, 0.3% -0.5% of Si, 2.4% -3% of Mn, less than 0.015% of P, less than 0.005% of S, 0.02% -0.08% of Alt, 0.13% -0.25% of Ti, 0.02% -0.07% of Nb and less than 0.005% of N;
wherein, the mass fraction of Ti and S satisfies the following relation: [ Ti ]/[ S ]. Gtoreq.26,
wherein [ Ti ] represents the mass fraction of Ti and [ S ] represents the mass fraction of S.
2. The steel sheet for enameling according to claim 1, wherein the matrix of the steel sheet for enameling is dispersed with precipitated phases of TiC and NbC, and the size of the precipitated phases is not more than 50nm.
3. The steel sheet for enamel according to claim 1, wherein the thickness of the steel sheet for enamel is 16mm to 20mm, and the steel sheet for enamel satisfies the following properties: yield strength of 660-750 MPa, tensile strength of 710-880 MPa, elongation after break A 50mm 20-35%, and is resistant to high temperature enameling at 800-900 ℃.
4. A method for producing an enamelled steel sheet according to any one of claims 1 to 3, characterized in that the method comprises:
obtaining a casting blank with the chemical composition;
and heating the casting blank, rolling in two stages and cooling in stages to obtain the enamelled steel plate.
5. The method of claim 4, wherein the staged cooling comprises a first stage cooling, a second stage cooling, and a third stage cooling, the first stage cooling having a cooling rate of 30 ℃/s to 40 ℃/s; the cooling speed of the second-stage cooling is less than or equal to 20 ℃/s, and the final cooling temperature of the second-stage cooling is 470-540 ℃; and the third stage of cooling is air cooling to room temperature.
6. The method of claim 4, wherein the heating is at a temperature of 1190 ℃ to 1260 ℃; the two-stage rolling comprises rough rolling and finish rolling, wherein the rough rolling is 5-7 times, the finish rolling is 5-7 times, and the finish rolling temperature of the finish rolling is 800-900 ℃.
7. An enamel steel comprising the steel sheet for enamel according to any one of claims 1 to 3 and an enamel layer provided on at least one plate surface of the steel sheet for enamel.
8. The enamel steel of claim 7 wherein the microstructure of the enamel steel comprises pearlite and ferrite, the grain size of the enamel steel is <5 μm, and the matrix of the enamel steel is dispersed with newly precipitated phases of TiC and NbC, the newly precipitated phases having a size <20nm.
9. The enamelled steel according to claim 7, characterized in that it fulfils the following properties: yield strength is 380 MPa-450 MPa, tensile strength is 520 MPa-750 MPa, and elongation after break A 50mm 28% -47%.
10. An enamel spliced tank is characterized in that the water storage capacity of the enamel spliced tank is more than or equal to 25000m 3 The enamel insulated tank comprises a metal structural component made of an enamel steel according to any one of claims 7 to 9.
CN202311438655.2A 2023-11-01 2023-11-01 Steel plate for enamel, preparation method of steel plate, enamel steel and enamel spliced tank Pending CN117488185A (en)

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