CN113025907A - Cold-rolled enameled steel plate for anti-pressing and anti-explosion porcelain water heater liner and production method thereof - Google Patents

Cold-rolled enameled steel plate for anti-pressing and anti-explosion porcelain water heater liner and production method thereof Download PDF

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CN113025907A
CN113025907A CN202110252713.7A CN202110252713A CN113025907A CN 113025907 A CN113025907 A CN 113025907A CN 202110252713 A CN202110252713 A CN 202110252713A CN 113025907 A CN113025907 A CN 113025907A
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cold
percent
rolled
less
equal
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贾幼庆
赵云龙
汪建威
王占业
李凯旋
张涛
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/06—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
    • C22C38/14—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
    • C21D2211/005—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)

Abstract

The invention discloses a cold-rolled enameled pressed steel plate for an anti-explosion porcelain water heater liner and a production method thereof, and relates to the technical field of cold-rolled enameled pressed steel plates. The invention relates to a cold-rolled enameled pressed steel plate for an anti-knock porcelain water heater liner and a production method thereof, wherein the cold-rolled enameled pressed steel plate comprises the following main chemical components in percentage by weight: c: 0.015% -0.045%; si is less than or equal to 0.05 percent; mn: 0.1 to 0.4 percent; p is less than or equal to 0.02 percent; s: 0.01 to 0.016 percent; and Als: 0.02% -0.05%; ti: 0.025 percent to 0.06 percent; n: 0.004% -0.008%; b: 0.002% -0.007%; r of the cold rolled steel sheetp0.2280 to 380MPa, tensile strength Rm340-440 MPa, elongation after break A50Not less than 26 percent, thereby ensuring that the steel plate has the scaling explosion resistance, the adherence and the pressing explosion resistance porcelain.

Description

Cold-rolled enameled steel plate for anti-pressing and anti-explosion porcelain water heater liner and production method thereof
Technical Field
The invention relates to the technical field of cold-rolled enameled pressed steel, in particular to a cold-rolled enameled pressed steel for an anti-explosion porcelain water heater liner and a production method thereof.
Background
In the production process of the metal enamel product, a steel plate is formed into a base blank with a required shape, and the surface of the base blank is coated with enamel and sintered. The enamel steel product has the advantages of beautiful appearance, good corrosion resistance, high surface smoothness, difficult breeding of bacteria and the like, and increasingly becomes a raw material choice for light industry, household appliances, building decoration and environmental protection products.
With the development of economy and the continuous improvement of the living standard of people, the electric water heater has gone into thousands of households, and the inner containers of the existing household water heaters are all produced by using special enameled steel plates. With the continuous improvement of national standards of safety performance of household appliances, the service life of the inner container of the water heater is required to reach more than 10 years, the pulse fatigue test of the inner container of the water heater is over 26 ten thousand times, the pressure of a pressure test is improved from 0.85MPa to 1.05MPa, and higher requirements are provided for the fish scaling resistance, the pressure explosion resistance and the enamel adherence of the enamel steel for the inner container of the water heater. Particularly, the performance of resisting the ceramic explosion caused by pressing is improved, and the 40-80L inner container can not be subjected to ceramic explosion caused by pressing only when the yield strength of the enameled pressed steel is more than or equal to 280 MPa. If the inner container with the volume of more than 100L is produced, the yield strength of the steel plate is required to be more than 400MPa so as to ensure that the porcelain explosion caused by pressing can not occur. The yield strength of the existing cold-rolled enamel steel is within the range of 180-260 MPa, and the production requirement for manufacturing the water heater liner cannot be met.
The Chinese patent with the patent application number of 201810474075.1 discloses a manufacturing method of cold-rolled enamel steel with the yield strength of more than 230MPa, and the cold-rolled enamel steel comprises the following chemical components in percentage by weight: less than or equal to 0.07 Wt%, Si: less than or equal to 0.03 Wt%, Mn: 0.25-0.50 Wt%, P is less than or equal to 0.02 Wt%, S is less than or equal to 0.02 Wt%, Alt is 0.015-0.035 Wt%, N is 0.005-0.010 Wt%; a steel sheet for porcelain enamel having remarkably excellent fishscale resistance, which has an improved ability to form voids in the steel sheet by the combination of hot rolling, cold rolling and leveling processes to increase the ability to trap hydrogen. The yield strength of the steel plate is 230-260 MPa, and the requirement of a pressing test cannot be met.
Chinese patent publication No. CN 104928577B discloses a steel sheet with high hole expansion rate and excellent enameling performance and a manufacturing method thereof, wherein the steel sheet comprises the following chemical elements in percentage by mass: c: 0.011-0.030%; mn: 0.10-0.50%; s: 0.005-0.020%; al: 0.005-0.050%; n: 0.003 to 0.010 percent; b: 0.0010-0.0050%; ti: 0.001-0.020%; the balance being Fe and unavoidable impurities. Correspondingly, the invention also discloses a manufacturing method of the steel plate. The steel plate with high hole expansion rate and excellent enameling performance not only has high hole expansion rate, excellent fish scaling resistance and hydrogen storage capacity, but also has high-temperature baking hardening performance. However, the steel plate of the patent has yield strength less than 260MPa and cannot meet the requirement of a pressing test.
Chinese patent publication No. CN 102199726B discloses a continuous annealing process of a high-strength cold-rolled steel plate for a water heater liner, which comprises the following chemical elements in percentage by mass: c: 0.04-0.1%; si is less than or equal to 0.06 percent; mn: 0.5-1%; p is less than or equal to 0.045%; s is less than or equal to 0.035%; al: 0.02-0.08%; nb: 0.015-0.06%; ti: 0.015-0.075%; n is less than or equal to 0.005 percent, and the invention also discloses a manufacturing process of the high-strength cold-rolled enameled pressed steel. By adopting the technical scheme, the yield strength of the steel plate is more than or equal to 380Mpa, the elongation is more than or equal to 20 percent, the yield strength of the steel plate is more than or equal to 320Mpa after the enamel is insulated for 10 minutes at 860 ℃, a fatigue test is met, the steel plate is ensured to have excellent fish scaling resistance by taking Ti and Nb compounds as 'hydrogen catching' traps, but the steel plate has too high strength, is not suitable for producing a water heater liner with the capacity of 100L and has higher cost.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the problem that cold-rolled enameled steel for a water heater liner produced in the prior art can not completely meet various requirements of the liner, the invention provides a cold-rolled enameled steel plate for the water heater liner with the anti-knock porcelain and a production method thereof, wherein a low-carbon cold-rolled enameled steel plate is adopted, a component system of Ti and N, B is controlled, and then a reasonable rolling process is adopted to form a hydrogen-trapping trap mainly comprising MnS, Ti4C2S2, TiS2, TiC and BN, so that the steel plate is ensured to have the anti-fish scaling and anti-knock performance and the adherence performance, and the strength is improved to ensure the anti-knock porcelain performance.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a cold-rolled enameled steel plate for an anti-pressing and anti-explosion porcelain water heater liner comprises the following main chemical components in percentage by weight: c: 0.015% -0.045%; si is less than or equal to 0.05 percent; mn: 0.10 to 0.40 percent; p is less than or equal to 0.020%; s: 0.010% -0.016%; and Als: 0.020% -0.050%; ti: 0.025 percent to 0.060 percent; n: 0.0040 to 0.0080 percent; b: 0.0020 to 0.0070 percent; the metallographic structure of the cold-rolled steel plate consists of a ferrite matrix and a small amount of pearlite, the grain size of the metallographic structure is 10.0-11.0, and the hydrogen permeation time is more than or equal to 16 min; elongation Strength R at non-proportional elongation of 0.2%p0.2280 to 380MPa, tensile strength Rm340-440 MPa, elongation after break A50Not less than 26 percent; increasing the S content to form MnS, Ti4C2S2、TiS2And TiC, etc., wherein Ti is4C2S2The precipitated phase is dispersed and can provide stable hydrogen storageTraps, and thus is very advantageous for improving the fish scaling resistance.
According to the further technical scheme, the cold-rolled steel plate comprises the following main chemical components in percentage by weight: c: 0.04-0.1%; si is less than or equal to 0.06 percent; mn: 0.5-1%; p is less than or equal to 0.045%; s is less than or equal to 0.035%; al: 0.02-0.08%; nb: 0.015-0.06%; ti: 0.015-0.075%; n is less than or equal to 0.005 percent, and the balance of Fe and inevitable impurity elements. Wherein, C: the lower the carbon is, the better the deep drawing performance is, but in the invention, the precipitated phase formed by the carbon, titanium and sulfur is used as a hydrogen storage trap, thus being beneficial to the fish scaling resistance, and the strength of the steel plate needs to be ensured, so the carbon cannot be too low; si: silicon is used as a harmful element, the plasticity is damaged due to the high silicon content, and the iron scale on the surface of the steel plate is not easy to remove; mn: manganese is an effective deoxidizing element, large-size inclusions in steel can be removed to ensure the purity of the steel, and manganese and sulfur form manganese sulfide, so that the adverse effect of FeS on plasticity is avoided, the hydrogen storage performance can be improved, the manganese has a solid solution strengthening effect on the steel performance, the phase transition temperature of austenite converted into ferrite can be reduced by Mn, the hot working temperature range is expanded, the ferrite grain size can be favorably refined, but the Mn content is too high, the Mn segregation degree of a casting blank is increased in the continuous casting process, and a pearlite or bainite banded structure is easily formed at the central part of the thickness of a steel plate, so that the plasticity, the welding performance and the fatigue performance are adverse; p: the diffusion speed of P in gamma-Fe and alpha-Fe is low, segregation is easy to form, and the P is unfavorable for the forming performance, the low-temperature impact toughness and the welding performance of the steel plate; al: al is a deoxidizer added during steelmaking deoxidization, the forming and welding performance of the steel plate can be influenced by the high Al content, but a small amount of Al can also play a role in refining the structure; n: nitrogen and carbon are equivalent to interstitial atoms, which are needed to be fixed for formability of steel, and TiN is formed after Ti is added, and a small amount of TiN can improve hydrogen storage capacity, but TiN particles are large and mostly square, which is unfavorable for plasticity, and large TiN particles are unfavorable for adhesion performance. The nitrogen content cannot be high.
In a further technical scheme, Ti is an important element in the invention and is the most economical alloy element for fixing C, N, and Ti is formed with C, S4C2S2And TiC and the like, and ensures deep drawing performance and scale explosion resistance. However, too high Ti content may deteriorate the adhesion properties of the steel sheet. In order to ensure that C, N, S in the steel is fixed as much as possible, the Ti content is controlled according to 4C +3.43N +0.75S + 0.02%, and the Ti content range is 0.025% -0.060%.
A production method of a cold-rolled enameled pressed steel plate for an anti-explosion porcelain water heater liner is characterized by comprising the following chemical components: c: 0.04-0.1%; si is less than or equal to 0.06 percent; mn: 0.5-1%; p is less than or equal to 0.045%; s is less than or equal to 0.035%; al: 0.02-0.08%; nb: 0.015-0.06%; ti: 0.015-0.075%; the N is less than or equal to 0.005 percent, and the rest is the molten steel of Fe and inevitable impurity elements, and the molten steel is pretreated by molten iron → converter smelting → alloy fine-tuning station → RH → continuous casting → hot rolling → acid pickling cold continuous rolling → continuous annealing → flattening to produce the cold-rolled steel plate for enamel; the total cold rolling reduction rate is controlled to be 70-80%, the mixed crystal structure can be crushed under the action of large cold rolling reduction rate, and the structure is improved through subsequent annealing; the leveling elongation is controlled to be 1.0-1.6%, the leveling is mainly used for eliminating a material yield platform and improving the plate shape, the elongation is too low to eliminate the yield platform, and the wrinkle defect is easily generated at the local part during stamping, wherein the elongation is measured by an elongation index; the elongation is too high, crystal grains are obviously elongated, the difference of transverse and longitudinal properties of the material is large, the processing property is poor, and the punching is easy to crack.
In a further technical scheme, the alloy fine adjustment station adopts ladle top slag modification.
In a further technical scheme, the RH adopts a light treatment process; if oxygen blowing is needed, oxygen is blown in the early and middle stages according to the temperature and the oxygen level; adjusting N to an internal control range by blowing nitrogen from RH lifting gas; adding alloys such as ferro-sulphur, FeTi70, ferroboron and the like to adjust the contents of S, Ti, B and the like in the steel to target values; and ensuring that the net circulation time is not less than 6min before breaking.
According to a further technical scheme, the tapping temperature of a casting blank is controlled to be 1230-1250 ℃, dispersed fine two-phase particles are expected to be obtained by adding Ti, TiN and Ti4C2S2 are generated in the continuous casting process due to the high melting point, so that large-particle two-phase particles can be re-fused into a substrate and then are dispersed by adopting a higher slab heating temperatureDispersing and separating out; the final rolling temperature is controlled to be 880-900 ℃, and in order to ensure deep drawing performance and austenite single-phase region rolling, the final rolling temperature is required to be higher than Ar3Transformation point of A of the steelr3The transformation point was 870 ℃.
According to the further technical scheme, a vertical continuous annealing furnace is adopted for annealing, the soaking temperature of continuous annealing is 770-780 ℃, and the corresponding annealing time is controlled within 50-100 s; the overaging temperature is 340-380 ℃. The continuous annealing process has the characteristics of high production efficiency, good steel plate straightness and good annealing uniformity, the steel plate after cold rolling is a remarkable fibrous structure, the strength is high, the plasticity is poor, and the steel plate needs to be annealed to obtain a structure with good plasticity, but the annealing time of the continuous annealing process is relatively short, so that the steel plate structure is ensured to be completely recovered and recrystallized at a higher annealing temperature, and the annealing temperature and the annealing time need to be reasonably matched.
In the further technical scheme, the laminar cooling adopts back-end cooling; the coiling temperature is controlled at 630-650 ℃. The TiC particles are precipitated at a low temperature of 650-900 ℃, so that the TiC precipitation is greatly influenced by laminar cooling and hot rolling coiling temperatures. Considering that the subsequent continuous annealing process has short annealing time and less influence on precipitation, the invention adopts higher coiling temperature and back-end cooling to promote the precipitated phase to be completely precipitated in a hot plate state as much as possible; meanwhile, the later section cooling can also promote the growth of ferrite grains and improve the deep drawing performance of the material.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention relates to a cold-rolled enameled pressed steel plate for an anti-knock porcelain water heater liner and a production method thereof, which adopt low carbon, control the component systems of Ti and N, B, and increase the S content through a reasonable rolling process to form MnS and Ti4C2S2、TiS2And TiC, etc., wherein Ti is4C2S2The precipitated phases are numerous and dispersed, and a stable hydrogen storage trap can be provided, so that the method is very favorable for improving the anti-scaling performance;
(2) the invention relates to an anti-pressing and anti-explosion ceramic water heater linerBy using the cold-rolled enameled steel plate and the production method thereof, C, N, S Ti content in the fixed steel is controlled according to 4C +3.43N +0.75S + 0.02%, the Ti content range is 0.025% -0.060%, and Ti and C, S form Ti4C2S2And TiC and the like, so that the deep drawing performance and the fish scale explosion resistance are ensured;
(3) the invention relates to a cold-rolled enameled steel plate for an anti-pressing and explosion porcelain water heater liner and a production method thereof, wherein the tapping temperature of a casting blank is controlled at 1230-1250 ℃, dispersed fine two-phase particles are obtained by adding Ti, and TiN and Ti are used for obtaining the fine two-phase particles4C2S2Because the melting point is high, the large-particle two-phase particles can be re-fused into the substrate and then dispersed and separated out by adopting higher slab heating temperature; the final rolling temperature is controlled to be 880-900 ℃, and in order to ensure deep drawing performance and austenite single-phase region rolling, the final rolling temperature is required to be higher than Ar3Transformation point of A of the steelr3The phase transition point is 870 ℃;
(4) the invention relates to a cold-rolled enameled steel plate for an anti-pressing and anti-explosion porcelain water heater liner and a production method thereof, wherein a vertical continuous annealing furnace is adopted for annealing, the soaking temperature of continuous annealing is 770-780 ℃, and the corresponding annealing time is controlled within 50-100 s; the overaging temperature is 340-380 ℃; the steel plate structure is completely recovered and recrystallized by adopting higher annealing temperature, and the annealing temperature and the annealing time need to be reasonably matched;
(5) the invention relates to a cold-rolled enameled pressed steel plate for an anti-knock porcelain water heater liner and a production method thereof, wherein laminar cooling adopts back-end cooling; the coiling temperature is controlled at 630-650 ℃, and the high coiling temperature and the rear section cooling are adopted to promote the precipitated phase to be completely precipitated in a hot plate state as much as possible; meanwhile, the later section cooling can also promote the growth of ferrite grains and improve the deep drawing performance of the material.
Drawings
FIG. 1 is a metallographic structure diagram of a steel sheet according to an example of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
The cold-rolled enameled pressed steel plate for the inner container of the porcelain explosion-resistant water heater in the embodiment is shown in fig. 3, and the cold-rolled steel plate comprises the following main chemical components in percentage by weight: c: 0.015% -0.045%; si is less than or equal to 0.05 percent; mn: 0.10 to 0.40 percent; p is less than or equal to 0.020%; s: 0.010% -0.016%; and Als: 0.020% -0.050%; ti: 0.025 percent to 0.060 percent; n: 0.0040 to 0.0080 percent; b: 0.0020 to 0.0070 percent; the metallographic structure of the cold-rolled steel plate consists of a ferrite matrix and a small amount of pearlite, the grain size of the metallographic structure is 10.0-11.0, and the hydrogen permeation time is more than or equal to 16 min; elongation Strength R at non-proportional elongation of 0.2%p0.2280 to 380MPa, tensile strength Rm340-440 MPa, elongation after break A50Not less than 26 percent; increasing the S content to form MnS, Ti4C2S2、TiS2And TiC, etc., wherein Ti is4C2S2The precipitated phase is much and dispersed, and can provide a stable hydrogen storage trap, so the method is very favorable for improving the anti-scaling performance. But the welding performance of the steel plate is deteriorated due to the over-high content of S, the adhesion performance of the enameled steel plate is not good, and the content of the Mn element is combined, so that the percentage content of S is controlled to be 0.010-0.016%; b can reduce the strength of the steel plate to make up for the problem of overhigh strength caused by overhigh content of C, Mn, and the formed BN can effectively improve the stamping formability and the fish scaling resistance of the steel plate.
Example 2
The basic structure of the production method of the cold-rolled enameled pressed steel plate for the anti-knock porcelain water heater liner is the same as that of the production method of the embodiment 1, and the differences and improvements are as follows: the chemical components of the molten steel are shown in Table 1, and the balance is Fe and inevitable impurity elements.
C：0.04～0.1％；Si≤0.06％；Mn：0.5～1％；P≤0.045％；S≤0.035％；Al：0.02～0.08％；Nb：0.015～0.06％；Ti：0.015～0.075％；N≤0.005％。
Table 1 examples and comparative examples chemical composition, wt%
Figure BDA0002966699200000051
The cold-rolled steel sheet for enamel of the present invention is produced through hot metal pretreatment → converter smelting → alloy fine tuning station → RH → continuous casting → hot rolling → acid pickling cold continuous rolling → continuous annealing → leveling, and the main process parameters and final properties thereof are shown in table 2. The hydrogen permeation test standard adopts ISO 17081, and the hydrogen release surface coating adopts an electroplated nickel coating to improve the signal-to-noise ratio.
Sampling a steel plate to carry out an enamel test, using alcohol to remove oil and blow the steel plate before the test, using sensitive powder to carry out the enamel test, and adopting single-sided or double-sided enamel. The samples were subjected to press forming, welding, enameling and pressing tests in a certain water heater liner manufacturing enterprise, the pressing test pressure was 1.15MPa (60L liner), and the specific results are shown in Table 3 and FIG. 1. It can be seen that the enamel prepared by the method has excellent scale explosion resistance, adherence and compression explosion resistance. FIG. 1 shows the metallographic structure of the example, which is seen to be mainly a ferritic matrix + a small amount of pearlite + a small amount of carbide, with a grain size rating of 10.
TABLE 2 production Process and product Properties
Figure BDA0002966699200000061
TABLE 3 enameling firing Process and Performance evaluation
Figure BDA0002966699200000062
As can be seen from the above examples, the special steel for cold-rolled enamel produced according to the invention has a metallographic structure consisting of a ferrite matrix, a small amount of pearlite and a small amount of carbide, the grain size grade is 10.0-11.0, and Rp0.2280 to 380MPa, RmIs 340-440 MPa, A50Not less than 26 percent, the hydrogen permeation time is not less than 16min, and the coating has excellent scaling explosion resistance, pressing explosion resistance and adherence.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (9)

1. The utility model provides an anti cold rolling enameled pressed steel for porcelain water heater inner bag that explodes which characterized in that: the cold-rolled steel sheet comprises the following main chemical components in percentage by weight: c: 0.015% -0.045%; si is less than or equal to 0.05 percent; mn: 0.10 to 0.40 percent; p is less than or equal to 0.020%; s: 0.010% -0.016%; and Als: 0.020% -0.050%; ti: 0.025 percent to 0.060 percent; n: 0.0040 to 0.0080 percent; b: 0.0020 to 0.0070 percent; the metallographic structure of the cold-rolled steel plate consists of a ferrite matrix and a small amount of pearlite, the grain size of the metallographic structure is 10.0-11.0, and the hydrogen permeation time is more than or equal to 16 min; elongation Strength R at non-proportional elongation of 0.2%p0.2280 to 380MPa, tensile strength Rm340-440 MPa, elongation after break A50≥26％。
2. The cold-rolled enameled pressed steel sheet for the inner container of the porcelain explosion-resistant water heater as claimed in claim 1, wherein: the cold-rolled steel sheet comprises the following main chemical components in percentage by weight: c: 0.04-0.1%; si is less than or equal to 0.06 percent; mn: 0.5-1%; p is less than or equal to 0.045%; s is less than or equal to 0.035%; al: 0.02-0.08%; nb: 0.015-0.06%; ti: 0.015-0.075%; n is less than or equal to 0.005 percent, and the balance of Fe and inevitable impurity elements.
3. The cold-rolled enameled pressed steel sheet for the inner container of the porcelain explosion-resistant water heater as claimed in claim 2, wherein: c, N, S in the steel was fixed, and the Ti content was controlled in a ratio of 4C +3.43N +0.75S + 0.02%.
4. A production method of a cold-rolled enameled pressed steel plate for an anti-explosion porcelain water heater liner is characterized by comprising the following chemical components: c: 0.04-0.1%; si is less than or equal to 0.06 percent; mn: 0.5-1%; p is less than or equal to 0.045%; s is less than or equal to 0.035%; al: 0.02-0.08%; nb: 0.015-0.06%; ti: 0.015-0.075%; the N is less than or equal to 0.005 percent, and the rest is the molten steel of Fe and inevitable impurity elements, and the molten steel is pretreated by molten iron → converter smelting → alloy fine-tuning station → RH → continuous casting → hot rolling → acid pickling cold continuous rolling → continuous annealing → flattening to produce the cold-rolled steel plate for enamel; the total cold rolling reduction is controlled to be 70-80 percent; the leveling elongation is controlled to be 1.0-1.6%.
5. The production method of the cold-rolled enameled pressed steel sheet for the anti-explosion porcelain water heater liner, according to claim 4, is characterized in that: and the alloy fine adjustment station adopts ladle top slag modification.
6. The production method of the cold-rolled enameled pressed steel sheet for the anti-explosion porcelain water heater liner, according to claim 4, is characterized in that: the RH adopts a light treatment process; if oxygen blowing is needed, oxygen is blown in the early and middle stages according to the temperature and the oxygen level; adjusting N to an internal control range by blowing nitrogen from RH lifting gas; adding alloys such as ferro-sulphur, FeTi70, ferroboron and the like to adjust the contents of S, Ti, B and the like in the steel to target values; and ensuring that the net circulation time is not less than 6min before breaking.
7. The production method of the cold-rolled enameled pressed steel sheet for the anti-explosion porcelain water heater liner, according to claim 4, is characterized in that: controlling the discharging temperature of the casting blank to be 1230-1250 ℃; the finishing temperature is controlled to be 880-900 ℃.
8. The production method of the cold-rolled enameled pressed steel sheet for the anti-explosion porcelain water heater liner, according to claim 4, is characterized in that: annealing by adopting a vertical continuous annealing furnace, wherein the soaking temperature of the continuous annealing is 770-780 ℃, and the corresponding annealing time is controlled within 50-100 s; the overaging temperature is 340-380 ℃.
9. The production method of the cold-rolled enameled pressed steel sheet for the anti-explosion porcelain water heater liner, according to claim 4, is characterized in that: laminar cooling adopts back-end cooling; the coiling temperature is controlled at 630-650 ℃.
CN202110252713.7A 2021-03-09 2021-03-09 Cold-rolled enameled steel plate for anti-pressing and anti-explosion porcelain water heater liner and production method thereof Pending CN113025907A (en)

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