CN109207850B - High-service-strength enamel steel plate and manufacturing method thereof - Google Patents
High-service-strength enamel steel plate and manufacturing method thereof Download PDFInfo
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- CN109207850B CN109207850B CN201811128237.2A CN201811128237A CN109207850B CN 109207850 B CN109207850 B CN 109207850B CN 201811128237 A CN201811128237 A CN 201811128237A CN 109207850 B CN109207850 B CN 109207850B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 175
- 239000010959 steel Substances 0.000 title claims abstract description 175
- 210000003298 dental enamel Anatomy 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000004534 enameling Methods 0.000 claims abstract description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000005266 casting Methods 0.000 claims abstract description 31
- 238000010304 firing Methods 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 35
- 229910001563 bainite Inorganic materials 0.000 claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- 238000005098 hot rolling Methods 0.000 claims description 10
- 229910001562 pearlite Inorganic materials 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 238000003860 storage Methods 0.000 abstract description 11
- 238000007670 refining Methods 0.000 abstract description 7
- 238000009628 steelmaking Methods 0.000 abstract description 6
- 238000004880 explosion Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 239000011572 manganese Substances 0.000 description 7
- 239000002244 precipitate Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 239000000037 vitreous enamel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
-
- 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
- C22C38/04—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
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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)
- Materials Engineering (AREA)
- Mechanical 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 discloses a high-service-strength enamel steel plate and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: 0.1-0.15%, Si: 0.3 to 0.5%, Mn: 1 to 1.8% of P<0.013％，S<0.005%, Alt: 0.020-0.050%, V: 0.04-0.07%, N: 0.011-0.015% and the balance of iron and impurities; the manufacturing method comprises the following steps: 1) pretreating molten iron, steelmaking in a converter and refining to obtain casting blank molten iron; 2) continuously casting molten iron to prepare a casting blank; 3) heating a casting blank; 4) carrying out multi-pass rough rolling and finish rolling to obtain a finish rolled plate; 5) after laminar cooling, coiling to obtain a finished product; the yield strength of the steel plate is 460-550 MPa; after enameling and firing, the yield strength is 400-460 MPa, and the product can be used for manufacturing 9000m of water storage capacity3The lower layer of the enamel split tank wall is arranged above the tank.
Description
Technical Field
The invention relates to a steel plate for enamel and a manufacturing method thereof, in particular to a steel plate for enamel with high service strength and a manufacturing method thereof.
Background
Nowadays, some large-scale water treatment facilities such as water storage tanks, sewage treatment tanks and the like all adopt enamel split tanks, and the main parts of the enamel split tanks are enamel steel plates which are formed by enameling and enameling hot rolled steel plates special for enamel. Because the lower layer of the tank body bears larger water pressure than the upper layer, the lower layer of the tank body generally adopts a thick steel plate, and the upper layer adopts a thin steel plate. The yield strength of the steel plate after being enameled is the service strength of the steel plate, the larger the water storage capacity of the tank body is, the more the position is deviated from the lower layer of the tank body, the higher the service strength of the steel plate is required, namely the higher the yield strength of the steel plate after being enameled is.
Compared with a thin steel plate, the thick steel plate has higher difficulty in obtaining high service strength, firstly the thick steel plate has small rolling reduction during hot rolling and is difficult to obtain high hot rolling state strength, secondly the thick steel plate is enameled and burnt uniformly for thorough burning, the enamelning time is longer than that of the thin steel plate, and the strength of the thick steel plate is reduced more after enamelning and burning.
At present, after enameling burning, bending of thick hot rolled steel plate for lower layer of domestic assembled tankThe clothes strength is not high, is generally lower than 300MPa, and is only suitable for manufacturing 5000m of water storage capacity3And the following can bodies, and a high-strength steel sheet for enamel required for manufacturing a can body having a larger water storage capacity is lacking.
This is a disadvantage of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-service-strength steel plate for enamel and a manufacturing method thereof, and the steel plate is suitable for manufacturing a thick steel plate for the lower layer of a larger assembled tank.
The invention provides a high-service-strength enamel steel plate which comprises the following chemical components in percentage by weight: 0.1-0.15%, Si: 0.3 to 0.5%, Mn: 1-1.8%, P < 0.013%, S < 0.005%, Alt: 0.020-0.050%, V: 0.04-0.07%, N: 0.011-0.015%, and the balance of iron and inevitable impurities.
The thickness of the steel plate is 10-14 mm; the yield strength is 460-550 MPa, the tensile strength is 620-710 MPa, and the elongation percentage A after fracture50mm28 to 40 percent.
After the steel plate is subjected to enameling firing, the yield strength is 400-460 MPa, the tensile strength is 560-650 MPa, and the elongation after fracture is 28-41%.
The microstructure of the steel plate is ferrite, pearlite and bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 mu m, VN, V (C, N) and VC precipitated phases are distributed in a matrix in a dispersing way, and the size of more than 90% of the precipitated phases is less than 50 nm.
The yield strength of the steel plate after the base glaze enameling is 400-460 MPa, and the strength of the steel plate after the base glaze enameling is not greatly reduced because the structure of the steel plate after the base glaze enameling is ferrite, pearlite and bainite, the grain size is slightly increased but still smaller than 10 mu m, the size of the precipitate is slightly increased, the size of more than 80% of the precipitate is still smaller than 50nm, VC is precipitated in the enameling process, the size of VC is smaller than 10nm, and the high strength of the steel plate after the base glaze enameling is ensured by structure strengthening and precipitation strengthening. After the steel plate subjected to the enameling firing by the ground glaze has the yield strength of 400-460 MPa, the yield strength of the steel plate coated with the ground glaze is slightly higher or equal to that of the steel plate coated with the ground glaze, because the structure of the steel plate coated with the ground glaze is still ferrite, pearlite and bainite, the grain size is slightly increased but still smaller than 10 mu m, the size of the precipitate is slightly increased, the size of more than 70% of the precipitate is still smaller than 50nm, and VC is continuously precipitated in the enameling firing process, so that the yield strength of the steel plate coated with the ground glaze is slightly higher or equal to that of the steel plate coated with the ground glaze.
The invention also provides a manufacturing method of the steel plate for enamel, which comprises the following steps:
(1) the molten iron is pretreated, smelted in a converter and refined to obtain molten iron with the component proportion of the steel plate for enamel; the steel plate for enamel comprises the following chemical components in percentage by weight: c: 0.1-0.15%, Si: 0.3 to 0.5%, Mn: 1-1.8%, P < 0.013%, S < 0.005%, Alt: 0.020-0.050%, V: 0.04-0.07%, N: 0.011-0.015%, and the balance of iron and inevitable impurities;
(2) continuous casting: continuously casting the refined molten iron to obtain a casting blank;
(3) heating the casting blank;
(4) two-stage hot rolling: firstly, carrying out rough rolling and then carrying out finish rolling;
(5) coiling: and (4) cooling the finish rolled plate by laminar flow, and then coiling to obtain the steel plate for enamel.
Further, the temperature for heating the casting blank is 1190-1250 ℃.
Further, the finish rolling temperature of the finish rolling is 800-880 ℃.
Further, the coiling temperature is 510-590 ℃.
Further, the rough rolling is performed for 5-7 passes, and the finish rolling is performed for 6-7 passes.
Compared with the existing enamel steel plate used for manufacturing the split tank, the enamel steel plate has the beneficial technical effects that:
(1) the steel plate has high strength grade, particularly has high strength after enameling firing, has yield strength of more than or equal to 400MPa after twice high-temperature enameling firing, and can be used for manufacturing a steel plate with water storage capacity of 9000m3And the lower layer tank wall of the enamel assembling tank.
(2) The strength of most enameled steel plates can be reduced by 1/3 or more after two times of enameling, the strength of the steel plates after enameling is reduced by only dozens of MPa, the strength before enameling, namely the hot rolling strength of the steel plates is not too high while the high strength after enameling is obtained, thereby facilitating the bolt hole punching and arc bending processes before enameling and reducing the abrasion of each workpiece.
(3) The enamel steel sheet of the invention has good fish scaling resistance.
Drawings
FIG. 1 is a metallographic structure of a steel sheet for porcelain enamel prepared in example 1 of the present invention.
FIG. 2 shows precipitates in a steel sheet for porcelain enamel prepared in example 1 of the present invention.
Detailed Description
The design principle of each chemical element in the enamel steel plate is as follows:
c in the chemical composition of the enamel steel sheet of the present invention: 0.1-0.15%, solid solution carbon and precipitated carbide are steel plates and provide strength, precipitated V (C, N) and VC have the precipitation strengthening effect, dispersed and precipitated V (C, N) and VC particles can inhibit grains from growing up, the grains of the steel plates are guaranteed to be fine, fine grains guarantee that the steel plates have high strength before and after enameling firing, especially the precipitated VC in the enameling firing process guarantees that the steel plates still have high strength after enameling firing, and meanwhile, V (C, N) and VC can be used as hydrogen traps, so that the scale explosion resistance of the steel plates is improved. The carbon is too low to ensure the strength of steel, and too high to be beneficial to the enamel process, so that the enamel process has bubble defects, and the C content is controlled to be 0.1-0.15%.
Si in the chemical composition of the enamel steel sheet of the present invention: 0.3-0.5%, Si is used as deoxidizer to remove oxygen in molten steel, and Si content is too high to reduce enamel adherence and damage surface quality, so Si content is controlled to be 0.3-0.5%.
The content of Mn in the chemical components of the enamel steel plate is selected to be 1-1.8%, Mn can refine the structure, and the size of precipitated particles and the average distance between the precipitated particles are reduced. Manganese is a solid solution strengthening element, can reduce the phase transition temperature of austenite transformed into 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. The strength is too high when the manganese content is too high, which is not beneficial to the punching and arc bending processes of the steel plate, so that the Mn content is selected to be 1-1.8%.
P in the chemical composition of the enamel steel sheet is less than 0.013%, and phosphorus is an impurity element, so that the P is easily segregated in grain boundaries, the brittleness of the steel sheet is increased, and the formability of the steel sheet is impaired, so that the phosphorus content is controlled to be 0.013% or less.
The chemical components of the enamel steel plate provided by the invention are less than 0.005%, large-size manganese sulfide is easily formed when the sulfur content is higher, the plasticity of the steel plate is obviously reduced, and hot brittleness is easily generated when the sulfur content is higher, so that the sulfur content is not more than 0.005%.
The chemical components of the enamel steel plate are 0.02-0.05% of Alt, aluminum is a strong deoxidizer and can inhibit the generation of other oxides, aluminum reacts with oxygen to generate aluminum oxide, the shaping of the aluminum oxide is poor, and a large amount of aluminum oxide inclusions can damage the processability of the steel plate, so a certain amount of aluminum is selected for deoxidation, and the Alt is 0.02-0.05%.
The chemical components of the steel plate for enamel are 0.04-0.07% of V, VN, V (C, N) and VC are formed by V and N, C, the dispersed and precipitated VN, V (C, N) and VC particles can inhibit the growth of crystal grains, the small crystal grains of the steel plate are guaranteed, the strength of the steel plate is provided, and the VN, V (C, N) and VC have a precipitation strengthening effect, especially the VC precipitated in the enamel firing process enables the steel plate after enamel firing to keep higher strength, and meanwhile, the VN, V (C, N) and VC are good hydrogen traps, and the scale explosion resistance of the enamel steel is guaranteed.
N in the chemical components of the enamel steel sheet of the present invention: 0.011-0.015%, and N and V are utilized to form fine and dispersed VN and V (C, N) precipitates to provide strength for the steel plate and provide a hydrogen trap, and the content of N is too much, so that large-size VN or AlN is easily formed and the performance of the steel plate is damaged, and the content of N is controlled to be 0.011-0.015%.
The present invention is described in further detail below with reference to the attached drawings and examples.
TABLE 1 chemical composition, wt. -%, of steel sheet for porcelain enamel in examples 1 to 5
Example 1
A steel sheet for enameling which has high strength after enameling, the chemical composition of which is shown in Table 1 in weight percent, and the thickness of which is 11 mm.
The preparation method of the steel plate for enamel comprises the following steps:
step 1, pretreating molten iron, steelmaking in a converter and refining to obtain molten iron with the component proportion of the steel plate for enamel, wherein the chemical components of the steel plate for enamel are shown in the table 1 in percentage by weight;
and 2, continuous casting: continuously casting the refined molten iron to obtain a casting blank;
step 3, heating the casting blank: controlling the temperature of the casting blank to be 1220 ℃ through heating;
step 4, two-stage hot rolling: firstly, carrying out 6-pass rough rolling and then carrying out 7-pass finish rolling, wherein the final rolling temperature is 860 ℃;
and step 5, coiling: and (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 540 ℃ to obtain the steel plate for enamel.
The metallographic structure of the steel plate for enamel prepared by the method is shown in figure 1, the microstructure of the steel plate is ferrite + pearlite + bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 μm, VN, V (C, N) and VC precipitated phases are distributed in a dispersed mode in a matrix, the size of more than 90% of the precipitated phases is less than 50nm, and the transmission electron microscope image of the second-phase precipitated phases is shown in figure 2.
The enamel steel plate prepared by the method has the yield strength of 498MPa, the tensile strength of 667MPa and the elongation percentage A after fracture50mmThe content was 35%.
The steel plate for enamel prepared by the method is enameled, and the specific technological parameters and results are as follows:
the steel plate is enameled and baked twice on both sides, the enamel firing temperature of the ground coat is 890 ℃, the enamel firing time of the ground coat is 20min, the yield strength of the steel plate after the enamel firing of the ground coat is 431MPa, the tensile strength is 605MPa, and the elongation percentage A after the breakage is realized50mmIs 31 percent;
coating a surface glaze on the steel plate after the enameling firing with the base glaze, enameling firing at the temperature of 790 ℃ for 18min, and enameling firing the surface glaze for 18min, wherein the yield strength and the tensile strength of the steel plate after the enameling firing with the base glaze and the surface glaze are 440MPa, 607MPa and the elongation after breakage A50mmThe content was found to be 31.5%.
The total thickness of the ground coat and the surface coat glaze layer of the enameled steel sheet prepared by the method is 300 mu m, after standing for 6 months, the double-sided surface condition of the enameled steel sheet is observed, and the double sides have no scaling explosion and have good scaling explosion resistance.
The enameled pressed steel prepared by the method meets the requirement of 9000m of water storage capacity3And the use requirements of the lower layer tank wall of the enamel assembling tank are met.
Example 2
A steel sheet for enameling which has high strength after enameling, the chemical composition of which is shown in Table 1 in weight percent, and the thickness of which is 13 mm.
The preparation method of the steel plate for enamel comprises the following steps:
step 1, pretreating molten iron, steelmaking in a converter and refining to obtain molten iron with the component proportion of the steel plate for enamel, wherein the chemical components of the steel plate for enamel are shown in the table 1 in percentage by weight;
and 2, continuous casting: continuously casting the refined molten iron to obtain a casting blank;
step 3, heating the casting blank: controlling the temperature of the casting blank to be 1230 ℃ by heating;
step 4, two-stage hot rolling: firstly, carrying out 6-pass rough rolling and then carrying out 7-pass finish rolling, wherein the final rolling temperature is 840 ℃;
and step 5, coiling: and (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 540 ℃ to obtain the steel plate for enamel.
The microstructure of the steel plate for enamel prepared by the method is ferrite, pearlite and bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 mu m, VN, V (C, N) and VC precipitated phases are distributed in a matrix in a dispersing way, and the size of more than 90% of the precipitated phases is less than 50 nm.
The enamel steel plate prepared by the method has the yield strength of 471MPa, the tensile strength of 650MPa and the elongation percentage A after fracture50mmIt was 33.5%.
The steel plate for enamel prepared by the method is enameled, and the specific technological parameters and results are as follows:
the steel plate is enameled and baked twice on both sides, the enamel baking temperature is 890 ℃, the enamel baking time is 23min, the yield strength of the steel plate after enamel baking is 407MPa, the tensile strength is 581MPa, and the elongation percentage A after breakage is obtained50mm35.5 percent;
coating a surface glaze on the steel plate after the enameling firing with the base glaze, enameling firing at the temperature of 790 ℃ for 21min, and enameling firing the surface glaze for two times, wherein the yield strength of the steel plate after the enameling firing with the base glaze and the surface glaze is 405MPa, the tensile strength of the steel plate is 588MPa, and the elongation after breakage A is50mmThe content was 34%.
The total thickness of the ground coat and the surface coat glaze layer of the enameled steel sheet prepared by the method is 200 mu m, after standing for 6 months, the double-sided surface condition of the enameled steel sheet is observed, and the double sides have no scaling explosion and have good scaling explosion resistance.
The enameled pressed steel prepared by the method meets the requirement of 9000m of water storage capacity3And the use requirements of the lower layer tank wall of the enamel assembling tank are met.
Example 3
A steel sheet for enameling which has high strength after enameling, whose chemical composition in weight percent is shown in Table 1, has a thickness of 14 mm.
The preparation method of the steel plate for enamel comprises the following steps:
step 1, pretreating molten iron, steelmaking in a converter and refining to obtain molten iron with the component proportion of the steel plate for enamel, wherein the chemical components of the steel plate for enamel are shown in the table 1 in percentage by weight;
and 2, continuous casting: continuously casting the refined molten iron to obtain a casting blank;
step 3, heating the casting blank: controlling the temperature of the casting blank to be 1210 ℃ by heating;
step 4, two-stage hot rolling: firstly, carrying out 6-pass rough rolling and then carrying out 7-pass finish rolling, wherein the final rolling temperature is 840 ℃;
and step 5, coiling: and (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 520 ℃ to obtain the steel plate for enamel.
The microstructure of the steel plate for enamel prepared by the method is ferrite, pearlite and bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 mu m, VN, V (C, N) and VC precipitated phases are distributed in a matrix in a dispersing way, and the size of more than 90% of the precipitated phases is less than 50 nm.
The enamel steel plate prepared by the method has the yield strength of 461MPa, the tensile strength of 630MPa and the elongation percentage A after fracture50mmThe content was 38%.
The steel plate for enamel prepared by the method is enameled, and the specific technological parameters and results are as follows:
the steel plate is subjected to double-sided coating and enameling twice, the enameling temperature of the ground coat is 890 ℃, the enameling time of the ground coat is 24min, the yield strength of the steel plate after the ground coat is enameling burnt is 404MPa, the tensile strength is 569MPa, and the elongation percentage A after breakage is obtained50mm39.5%;
coating the surface glaze on the steel plate after enameling by coating the bottom glaze and enameling, wherein the enameling temperature of the surface glaze is 790 ℃, the enameling time of the surface glaze is 22min, the yield strength of the steel plate after enameling by coating the bottom glaze and the surface glaze is 410MPa, the tensile strength is 571MPa, and the elongation after breakage A is obtained50mmThe content was 37%.
The total thickness of the ground coat and the overglaze layer of the enameled steel sheet prepared by the method is 360 mu m, after standing for 6 months, the double-sided surface condition of the enameled steel sheet is observed, and the double sides have no scaling explosion and have good scaling explosion resistance.
The enameled pressed steel prepared by the method meets the requirement of 9000m of water storage capacity3And the use requirements of the lower layer tank wall of the enamel assembling tank are met.
Example 4
A steel sheet for enameling having high strength after enameling firing, whose chemical composition in weight percent is shown in Table 1, has a thickness of 10 mm.
The preparation method of the steel plate for enamel comprises the following steps:
step 1, pretreating molten iron, steelmaking in a converter and refining to obtain molten iron with the component proportion of the steel plate for enamel, wherein the chemical components of the steel plate for enamel are shown in the table 1 in percentage by weight;
and 2, continuous casting: continuously casting the refined molten iron to obtain a casting blank;
step 3, heating the casting blank: controlling the temperature of the casting blank to be 1220 ℃ through heating;
step 4, two-stage hot rolling: firstly carrying out 7-pass rough rolling and then carrying out 6-pass finish rolling, wherein the final rolling temperature is 880 ℃;
and step 5, coiling: and (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 560 ℃ to obtain the steel plate for enamel.
The microstructure of the steel plate for enamel prepared by the method is ferrite, pearlite and bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 mu m, VN, V (C, N) and VC precipitated phases are distributed in a matrix in a dispersing way, and the size of more than 90% of the precipitated phases is less than 50 nm.
The enamel steel plate prepared by the method has the yield strength of 523MPa, the tensile strength of 689MPa and the elongation percentage A after fracture50mmThe content was 32%.
The steel plate for enamel prepared by the method is enameled, and the specific technological parameters and results are as follows:
the steel plate is enameled and baked twice, the enamel firing temperature of the ground coat is 890 ℃, the enamel firing time of the ground coat is 18min, the yield strength of the steel plate after the enamel firing of the ground coat is 451MPa, the tensile strength is 617MPa, and the elongation percentage after breakage is A50mm35% by weight;
coating a surface glaze on the steel plate after the enameling firing with the base glaze, enameling firing at the temperature of 790 ℃ for 17min, enameling firing the surface glaze for two times, and enameling firing the steel plate with the base glaze and the surface glaze, wherein the yield strength of the steel plate is 442MPa, the tensile strength of the steel plate is 610MPa, and the steel plate is cut offElongation A50mmThe content was 34%.
The total thickness of the ground coat and the overglaze layer of the enameled steel sheet prepared by the method is 400 mu m, and after standing for 6 months, the double-sided surface condition of the enameled steel sheet is observed, and the double sides of the enameled steel sheet have no scaling explosion and have good scaling explosion resistance.
The enameled pressed steel prepared by the method meets the requirement of 9000m of water storage capacity3And the use requirements of the lower layer tank wall of the enamel assembling tank are met.
Example 5
A steel sheet for enameling which has high strength after enameling, the chemical composition of which is shown in Table 1 in weight percent, and the thickness of which is 11 mm.
The preparation method of the steel plate for enamel comprises the following steps:
step 1, pretreating molten iron, steelmaking in a converter and refining to obtain molten iron with the component proportion of the steel plate for enamel, wherein the chemical components of the steel plate for enamel are shown in the table 1 in percentage by weight;
and 2, continuous casting: continuously casting the refined molten iron to obtain a casting blank;
step 3, heating the casting blank: controlling the temperature of the casting blank to be 1240 ℃ by heating;
step 4, two-stage hot rolling: firstly carrying out 5-pass rough rolling and then carrying out 7-pass finish rolling, wherein the final rolling temperature is 860 ℃;
and step 5, coiling: and (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 540 ℃ to obtain the steel plate for enamel.
The microstructure of the steel plate for enamel prepared by the method is ferrite, pearlite and bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 mu m, VN, V (C, N) and VC precipitated phases are distributed in a matrix in a dispersing way, and the size of more than 90% of the precipitated phases is less than 50 nm.
The enamel steel plate prepared by the method has the yield strength of 480MPa, the tensile strength of 657MPa and the elongation percentage A after fracture50mmThe content was found to be 36.5%.
The steel plate for enamel prepared by the method is enameled, and the specific technological parameters and results are as follows:
the steel plate is enameled and baked twice on both sides, the enamel baking temperature of the ground coat is 890 ℃, the enamel baking time of the ground coat is 20min, the yield strength of the steel plate after the enamel baking is 425MPa, the tensile strength is 601MPa, and the elongation percentage A after breakage is obtained50mmIs 32%;
coating the surface glaze on the steel plate after enameling with the base glaze, enameling, wherein the enameling temperature of the surface glaze is 790 ℃, the enameling time of the surface glaze is 18min, the yield strength of the steel plate after enameling with the base glaze and the surface glaze is 427MPa, the tensile strength of the steel plate is 609MPa, and the elongation after breakage A is obtained50mmThe content was 32.5%.
The total thickness of the ground coat and the surface coat glaze layer of the enameled steel sheet prepared by the method is 300 mu m, after standing for 6 months, the double-sided surface condition of the enameled steel sheet is observed, and the double sides have no scaling explosion and have good scaling explosion resistance.
The enameled pressed steel prepared by the method meets the requirement of 9000m of water storage capacity3And the use requirements of the lower layer tank wall of the enamel assembling tank are met.
Claims (5)
1. The high-service-strength thick-specification enameled steel plate is characterized by comprising the following chemical components in percentage by weight: 0.1-0.15%, Si: 0.3 to 0.5%, Mn: 1-1.8%, P < 0.013%, S < 0.005%, Alt: 0.020-0.050%, V: 0.04-0.07%, N: 0.011-0.015%, the balance being iron and inevitable impurities, wherein the microstructure of the steel plate is ferrite + pearlite + bainite, the volume of the bainite is more than 30%, the average grain size of the ferrite and the bainite is less than 10 mu m, VN, V (C, N) and VC precipitated phases are dispersed in the matrix, the size of more than 90% of the precipitated phases is less than 50nm, the thickness of the steel plate is 10-14 mm, after the steel plate is subjected to twice enameling firing, the yield strength of the steel plate is 460-550 MPa, the tensile strength of the steel plate is 620-710 MPa, and the elongation A50 mm after fracture is 28-40%.
2. A method of manufacturing a high strength in service thick gauge steel sheet for enamel as claimed in claim 1, comprising the steps of:
(1) the molten iron is pretreated, smelted in a converter and refined to obtain molten iron with the component proportion of the steel plate for enamel; the steel plate for enamel comprises the following chemical components in percentage by weight: c: 0.1-0.15%, Si: 0.3 to 0.5%, Mn: 1-1.8%, P < 0.013%, S < 0.005%, Alt: 0.020-0.050%, V: 0.04-0.07%, N: 0.011-0.015%, and the balance of iron and inevitable impurities;
(2) continuous casting: continuously casting the refined molten iron to obtain a casting blank;
(3) heating the casting blank;
(4) two-stage hot rolling: firstly carrying out rough rolling and then carrying out finish rolling, wherein the rough rolling is carried out for 5-7 times, and the finish rolling is carried out for 6-7 times;
(5) coiling: and (4) cooling the finish rolled plate by laminar flow, and then coiling to obtain the steel plate for enamel.
3. The method according to claim 2, wherein the temperature for heating the cast slab is 1190 to 1250 ℃.
4. The manufacturing method according to claim 2, wherein a finish rolling temperature of the finish rolling is 800 to 880 ℃.
5. The method according to claim 3, wherein the temperature of the winding is 510 to 590 ℃.
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| CN108396235A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Hot-rolled thick steel plate for enamel matrix and manufacturing method thereof |
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