CN116377344A - 550 MPa-level coating-free steel for photovoltaic bracket and production method thereof - Google Patents
550 MPa-level coating-free steel for photovoltaic bracket and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 50
- 238000001816 cooling Methods 0.000 claims description 44
- 238000007670 refining Methods 0.000 claims description 38
- 238000005096 rolling process Methods 0.000 claims description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 238000003723 Smelting Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 238000009749 continuous casting Methods 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 11
- 238000009529 body temperature measurement Methods 0.000 claims description 11
- 238000006477 desulfuration reaction Methods 0.000 claims description 11
- 230000023556 desulfurization Effects 0.000 claims description 11
- 238000011065 in-situ storage Methods 0.000 claims description 11
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 2
- 150000002910 rare earth metals Chemical class 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010583 slow cooling Methods 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
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- 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
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses 550 MPa-level coating-free steel for a photovoltaic bracket, which comprises the following chemical components in percentage by mass: c:0.08 to 0.12 percent, si:0.35 to 0.60 percent, mn:1.0 to 1.5 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.005 percent, cu:0.20-0.35%, cr:0.60-0.80%, ni:0.10-0.20, ti:0.030-0.050, ce:25-35ppm, alt: 0.020-0.050% and Fe and unavoidable impurities, and its production method. The invention adopts the conventional C Si Mn component system design, improves the corrosion resistance of the steel belt by adding a small amount of rare earth Ce of corrosion resistant elements Cu, cr and Ni, improves the cleanliness of molten steel, properly reduces the content of corrosion resistant alloy elements and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to 550 MPa-level coating-free steel for a photovoltaic bracket and a production method thereof.
Background
The solar energy generating capacity of China is continuously improved, the current installed capacity of China photovoltaic is 250GW, and the global capacity is about 800GW. Distributed photovoltaic will be further popularized and accelerated in the future. The photovoltaic industry is in charge of new development, the downstream steel market demand for the photovoltaic brackets is further increased, and the product has very good market prospect.
Disclosure of Invention
The invention aims to provide 550 MPa-level coating-free steel for a photovoltaic bracket and a production method thereof, which adopts a conventional C Si Mn component system design and improves the corrosion resistance of a steel belt by adding a small amount of rare earth Ce of corrosion resistant elements Cu, cr and Ni. The size and the shape of the residual inclusion in the steel are effectively controlled and improved by adding trace Ce, the cleanliness of the molten steel is improved, the content of corrosion-resistant alloy elements is properly reduced, and the production cost is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to 550 MPa-level coating-free steel for a photovoltaic bracket, which comprises the following chemical components in percentage by mass: c:0.08 to 0.12 percent, S i:0.35 to 0.60 percent, mn:1.0 to 1.5 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.005 percent, cu:0.20-0.35%, cr:0.60-0.80%, ni:0.10-0.20, ti:0.030-0.050, ce:25-35ppm, alt:0.020 to 0.050 percent, and the balance of Fe and unavoidable impurities.
A production method of 550 MPa-level coating-free steel for a photovoltaic bracket mainly comprises the following processes and parameters:
(1) The smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment-converter-LF refining-casting machine; the molten steel of the casting machine comprises the following components: 0.08 to 0.12 percent, si:0.35 to 0.60 percent, mn:1.0 to 1.5 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.005 percent, cu:0.20-0.35%, cr:0.60-0.80%, N i:0.05-0.15, ti:0.030-0.050, ce:25-35ppm, alt:0.020 to 0.050 percent;
(2) The hot rolling production process flow comprises the following steps: casting blank-roller hearth type heating furnace-hot continuous rolling mill-laminar cooling-coiling; the tapping temperature of the casting blank is 1125+/-25 ℃, the finish rolling temperature of finish rolling is 860+/-10 ℃, the cooling rate is 10-20 ℃/S, and the thickness of the hot rolled steel strip is 6-10mm; the cooling adopts a laminar cooling device, a front dispersion cooling mode and the coiling temperature is 615+/-10 ℃.
Further, the metallographic microstructure of the produced steel for the photovoltaic bracket is ferrite and a small amount of pearlite, and the grain size is between 11.5 level and 12.5 level.
Further, the specific process is as follows:
carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1628 ℃; then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining; the superheat degree of the continuous casting of the slab is 20 ℃, and then the slab is cleaned and slowly cooled, and the quality of the continuous casting slab is checked; the heating temperature of the plate blank is 1145 ℃, the heating time is 45mi < n >, and the plate blank is rolled by a hot continuous rolling mill; the finish rolling temperature is 858 ℃, and the thickness of the finished product is 6mm; the laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel belt is reduced to 620 ℃ for coiling.
Further, the specific process is as follows:
carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1630 ℃; then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining; the superheat degree of the continuous slab casting is 23 ℃, and then the slab is cleaned and slowly cooled, and the quality of the continuous casting blank is checked; the heating temperature of the plate blank is 1148 ℃, the heating time is 48min, and the plate blank is rolled by a hot continuous rolling mill; the finish rolling temperature is 862 ℃, and the thickness of the finished product is 6mm; the laminar cooling adopts pre-dispersion cooling, the cooling speed is 16 ℃/S, and the temperature of the steel strip is reduced to 610 ℃ for coiling.
Further, the specific process is as follows:
carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1625 ℃; then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining; the superheat degree of the continuous casting of the slab is 20 ℃, and then the slab is cleaned and slowly cooled, and the quality of the continuous casting slab is checked; the heating temperature of the plate blank is 1146 ℃, the heating time is 50min, and the hot continuous rolling mill rolls; the finish rolling temperature is 853 ℃, and the thickness of the finished product is 6mm; the laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel strip is reduced to 609 ℃ for coiling.
Compared with the prior art, the invention has the beneficial technical effects that:
the metallographic microstructure of the steel grade is ferrite and a small amount of pearlite, and the grain size is between 11.5 grade and 12.5 grade. The steel for 550 MPa-level coating-free photovoltaic brackets, which is produced by the method provided by the invention, has all indexes of surface quality and performance reaching the related technical standard requirements of a photovoltaic bracket matching factory through laboratory inspection, and meets the related use requirements. The mechanical property and the technological property meet the related standards and the requirements of users.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a microstructure of example 1.
Detailed Description
The present invention will be described in more detail with reference to specific examples. The examples are merely illustrative of the best mode of the invention and do not limit the scope of the invention in any way.
Example 1
A550 MPa grade coating-free steel for a photovoltaic bracket is produced by carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting a top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of the converter smelting, adding the waste steel into the converter, and tapping the converter at the temperature of 1628 ℃. And then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining, wherein the chemical components of the LF external refining for a casting machine are shown in the table 1. And (3) performing continuous casting on the plate blank at the superheat degree of 20 ℃, cleaning and slowly cooling the plate blank, and performing quality inspection on the continuous casting blank. The slab is heated at 1145 ℃ for 45min, and is rolled by a hot continuous rolling mill. The finish rolling temperature is 858 ℃, and the thickness of the finished product is 6mm. The laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel belt is reduced to 620 ℃ for coiling. And finally, detecting the performance of the product.
Example 2
A550 MPa grade coating-free steel for a photovoltaic bracket is produced by carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting a top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of the converter smelting, adding the waste steel into the converter, and tapping the converter at the temperature of 1630 ℃. And then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining, wherein the chemical components of the LF external refining for a casting machine are shown in the table 1. And (3) the continuous slab casting superheat degree is 23 ℃, and then the slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The slab is heated at 1148 ℃ for 48min, and is rolled by a hot continuous rolling mill. The finish rolling temperature is 862 ℃, and the thickness of the finished product is 6mm. The laminar cooling adopts pre-dispersion cooling, the cooling speed is 16 ℃/S, and the temperature of the steel strip is reduced to 610 ℃ for coiling. And finally, detecting the performance of the product.
Example 3
A550 MPa grade coating-free steel for a photovoltaic bracket is produced by carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting a top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of the converter smelting, adding the waste steel into the converter, and tapping the converter at the temperature of 1625 ℃. And then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining, wherein the chemical components of the LF external refining for a casting machine are shown in the table 1. And (3) performing continuous casting on the plate blank at the superheat degree of 20 ℃, cleaning and slowly cooling the plate blank, and performing quality inspection on the continuous casting blank. The heating temperature of the plate blank is 1146 ℃, the heating time is 50min, and the rolling is carried out by a hot continuous rolling mill. The finish rolling temperature is 853 ℃, and the thickness of the finished product is 6mm. The laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel strip is reduced to 609 ℃ for coiling. And finally, detecting the performance of the product.
Comparative example 1
Carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1628 ℃. And then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining, wherein the chemical components of the LF external refining for a casting machine are shown in the table 1. And (3) the continuous slab casting superheat degree is 18 ℃, and then the slab is cleaned, slowly cooled and the quality of the continuous casting slab is checked. The slab is heated at 1150 deg.c for 53 min and rolled in a hot continuous rolling mill. The finish rolling temperature is 880 ℃, and the thickness of the finished product is 6mm. The laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel belt is reduced to 615 ℃ for coiling. And finally, detecting the performance of the product.
Comparative example 2
Carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the waste steel into a converter, and tapping the converter at the temperature of 1633 ℃. And then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining, wherein the chemical components of the LF external refining for a casting machine are shown in the table 1. And (3) performing continuous casting on the plate blank at the superheat degree of 20 ℃, cleaning and slowly cooling the plate blank, and performing quality inspection on the continuous casting blank. The slab is heated at 1145 ℃ for 53 ℃ and is rolled by a hot continuous rolling mill. The finish rolling temperature is 876 ℃ and the thickness of the finished product is 6mm. The laminar cooling adopts pre-dispersion cooling, the cooling speed is 14 ℃/S, and the temperature of the steel strip is reduced to 615 ℃ for coiling. And finally, detecting the performance of the product.
TABLE 1 chemical Components (wt%) of examples 1 to 3 and comparative examples of the present invention
The steel coils of examples 1 to 3 of the present invention were subjected to mechanical property test, and the test results are shown in Table 2.
TABLE 2 mechanical Properties of the Steel coil of inventive examples 1 to 3 and comparative example
As can be seen from the data in table 2, the mechanical properties and the technological properties of the steel for the coating-free photovoltaic bracket produced by the method provided by the invention meet the requirements of the protocol signed by the user.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A550 MPa-level coating-free steel for a photovoltaic bracket is characterized in that: the chemical components of the composition in percentage by mass are: c:0.08 to 0.12 percent, si:0.35 to 0.60 percent, mn:1.0 to 1.5 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.005 percent, cu:0.20-0.35%, cr:0.60-0.80%, ni:0.10-0.20, ti:0.030-0.050, ce:25-35ppm, alt:0.020 to 0.050 percent, and the balance of Fe and unavoidable impurities.
2. The production method of 550 MPa-level coating-free steel for photovoltaic brackets according to claim 1, characterized in that: the main process and parameters are as follows:
(1) The smelting-continuous casting production process flow comprises the following steps: molten iron pretreatment-converter-LF refining-casting machine; the molten steel of the casting machine comprises the following components: 0.08 to 0.12 percent, si:0.35 to 0.60 percent, mn:1.0 to 1.5 percent, P: less than or equal to 0.018 percent, S: less than or equal to 0.005 percent, cu:0.20-0.35%, cr:0.60-0.80%, ni:0.05-0.15, ti:0.030-0.050, ce:25-35ppm, alt:0.020 to 0.050 percent;
(2) The hot rolling production process flow comprises the following steps: casting blank-roller hearth type heating furnace-hot continuous rolling mill-laminar cooling-coiling; the tapping temperature of the casting blank is 1125+/-25 ℃, the finish rolling temperature of finish rolling is 860+/-10 ℃, the cooling rate is 10-20 ℃/S, and the thickness of the hot rolled steel strip is 6-10mm; the cooling adopts a laminar cooling device, a front dispersion cooling mode and the coiling temperature is 615+/-10 ℃.
3. The production method of 550 MPa-level coating-free steel for photovoltaic brackets according to claim 2, characterized in that: the metallographic microstructure of the produced steel for the photovoltaic bracket is ferrite and a small amount of pearlite, and the grain size is between 11.5 level and 12.5 level.
4. The production method according to claim 2, characterized in that: the specific process is as follows:
carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1628 ℃; then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining; the superheat degree of the continuous casting of the slab is 20 ℃, and then the slab is cleaned and slowly cooled, and the quality of the continuous casting slab is checked; the heating temperature of the plate blank is 1145 ℃, the heating time is 45min, and the plate blank is rolled by a hot continuous rolling mill; the finish rolling temperature is 858 ℃, and the thickness of the finished product is 6mm; the laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel belt is reduced to 620 ℃ for coiling.
5. The production method according to claim 2, characterized in that: the specific process is as follows:
carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1630 ℃; then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining; the superheat degree of the continuous slab casting is 23 ℃, and then the slab is cleaned and slowly cooled, and the quality of the continuous casting blank is checked; the heating temperature of the plate blank is 1148 ℃, the heating time is 48min, and the plate blank is rolled by a hot continuous rolling mill; the finish rolling temperature is 862 ℃, and the thickness of the finished product is 6mm; the laminar cooling adopts pre-dispersion cooling, the cooling speed is 16 ℃/S, and the temperature of the steel strip is reduced to 610 ℃ for coiling.
6. The production method according to claim 2, characterized in that: the specific process is as follows:
carrying out desulfurization pretreatment on molten iron, dephosphorizing and decarbonizing the molten iron by adopting top-bottom combined blown converter smelting to obtain molten steel, blowing argon in the whole process of converter smelting, adding the scrap steel into a converter, and tapping the converter at the temperature of 1625 ℃; then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-situ temperature is more than or equal to 1560 ℃, and carrying out temperature measurement and component fine adjustment on the LF external refining; the superheat degree of the continuous casting of the slab is 20 ℃, and then the slab is cleaned and slowly cooled, and the quality of the continuous casting slab is checked; the heating temperature of the plate blank is 1146 ℃, the heating time is 50min, and the hot continuous rolling mill rolls; the finish rolling temperature is 853 ℃, and the thickness of the finished product is 6mm; the laminar cooling adopts pre-dispersion cooling, the cooling speed is 15 ℃/S, and the temperature of the steel strip is reduced to 609 ℃ for coiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310242929.4A CN116377344A (en) | 2023-03-14 | 2023-03-14 | 550 MPa-level coating-free steel for photovoltaic bracket and production method thereof |
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