CN117604380A - Gao Jiangyi welded 700MPa steel plate and manufacturing method and application thereof - Google Patents
Gao Jiangyi welded 700MPa steel plate and manufacturing method and application thereof Download PDFInfo
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- CN117604380A CN117604380A CN202311592367.2A CN202311592367A CN117604380A CN 117604380 A CN117604380 A CN 117604380A CN 202311592367 A CN202311592367 A CN 202311592367A CN 117604380 A CN117604380 A CN 117604380A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 204
- 239000010959 steel Substances 0.000 title claims abstract description 204
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 67
- 239000002893 slag Substances 0.000 claims description 66
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 41
- 238000007670 refining Methods 0.000 claims description 35
- 238000005496 tempering Methods 0.000 claims description 34
- 238000010791 quenching Methods 0.000 claims description 33
- 230000000171 quenching effect Effects 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- 229910052786 argon Inorganic materials 0.000 claims description 24
- 238000007664 blowing Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 12
- 239000004571 lime Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005336 cracking Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000004321 preservation Methods 0.000 description 33
- 238000005261 decarburization Methods 0.000 description 24
- 238000003466 welding Methods 0.000 description 22
- 229910000636 Ce alloy Inorganic materials 0.000 description 9
- 229910000599 Cr alloy Inorganic materials 0.000 description 9
- 229910000914 Mn alloy Inorganic materials 0.000 description 9
- 229910001257 Nb alloy Inorganic materials 0.000 description 9
- 229910000756 V alloy Inorganic materials 0.000 description 9
- 239000006260 foam Substances 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229920002148 Gellan gum Polymers 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a high-strength easy-to-weld 700MPa steel plate, a manufacturing method and application thereof, and particularly relates to the technical field of steel manufacturing. The Gao Jiangyi welded 700MPa steel plate comprises the following chemical components in percentage by mass: c:0.03 to 0.06 percent of Si: < 0.10%, mn:2.25% -2.40%, nb:0.075 to 0.09 percent, cr:0.20 to 0.24 percent of Ce:0.01% -0.02%, V:0.12 to 0.13 percent, and the balance of Fe and unavoidable impurities; wherein the thickness of the steel plate is 10 mm-50 mm. The steel plate provided by the invention has excellent mechanical properties, and the transverse impact energy average value of the steel plate reaches 160J-350J at 40 ℃; the yield strength is more than or equal to 730MPa, the tensile strength is 800-920 MPa, and the elongation after breaking is more than or equal to 17%.
Description
Technical Field
The invention relates to the technical field of steel manufacturing, in particular to a high-strength easy-to-weld 700MPa steel plate, and a manufacturing method and application thereof.
Background
With the requirement of large-scale and light-weight energy consumption of engineering equipment, the requirement of steel plates is gradually upgraded, and the requirements of steel for harbor city equipment on the strength, toughness and welding performance of the steel plates are also improved so as to meet the requirement of the engineering equipment industry and promote the development and upgrading of the engineering equipment industry. However, there is a remarkable strength effect on the production of wide and thick plates, namely, the higher the strength of the steel plate is, the poorer the toughness and welding performance of the steel plate are, the greater the processing and welding difficulty of the product is, the more complex the process is, and the phenomenon affects the upgrading and upgrading of the steel plate for engineering equipment.
At present, the high-strength steel plate for engineering equipment is unstable in strength and toughness matching and welding performance, and the problems of complex heat treatment process, poor stability, high production cost and the like restrict the application of the high-strength steel plate, and the prior art adopts an RH decarburization mode, so that the carbon-oxygen reaction is vigorous in the early stage of decarburization treatment, the splashing is serious, and an alloy chute is easily blocked, and the top of a vacuum chamber is easily blocked to cause top-portion gellan steel. How to design and develop a high-strength, high-toughness and excellent weldability steel plate, simplify the production process, improve the comprehensive quality and meet the requirements of engineering equipment is particularly necessary and urgent.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a high-strength easy-welding 700MPa steel plate so as to relieve at least one of the technical problems.
The second purpose of the invention is to provide the manufacturing method of the Gao Jiangyi welded 700MPa steel plate, which aims to simplify the production process of the high-strength steel plate in the prior art.
The invention also aims to provide the application of the Gao Jiangyi welded 700MPa steel plate in engineering equipment.
The invention is realized in the following way:
in a first aspect, the invention provides a high-strength easy-to-weld 700MPa steel plate, which comprises the following chemical components in percentage by mass:
c:0.03 to 0.06 percent of Si: < 0.10%, mn:2.25% -2.40%, nb:0.075 to 0.09 percent, cr:0.20 to 0.24 percent of Ce:0.01% -0.02%, V:0.12 to 0.13 percent, and the balance of Fe and unavoidable impurities;
wherein the thickness of the steel plate is 10 mm-50 mm.
In an alternative embodiment, the yield strength of the steel plate is more than or equal to 730MPa, the tensile strength is 800 MPa-920 MPa, the elongation after break is more than or equal to 17%, and the transverse impact energy at minus 40 ℃ is 160J-350J.
In an alternative embodiment, the carbon equivalent Ceq is less than or equal to 0.50%;
wherein ceq=c+mn/6+ (v+mo+cr)/5+ (ni+cu)/15.
In an alternative embodiment, the steel sheet is bent 180 ° without cracking at room temperature bending diameter d=3a.
In a second aspect, the invention provides a manufacturing method of the Gao Jiangyi welded 700MPa steel plate, which comprises the following steps:
A. tapping from the converter when the C content in the molten steel is less than or equal to 0.05%, lifting the molten steel to an LF refining furnace for heating, blowing argon and stirring for 3-8 min, and decarburizing by using residual oxygen in the molten steel to ensure that the C content is less than or equal to 0.03%;
B. continuously adding lime and alumina into an LF refining furnace to prepare white slag, and then adding aluminum particles to deoxidize; continuously adding 400-800 m aluminum wires into molten steel, blowing argon and stirring to remove residual oxygen in the molten steel; adding alloy after slagging is finished to obtain qualified molten steel;
C. the qualified molten steel is processed by a continuous casting machine to obtain a steel billet;
D. and heating the blank, carrying out sectional rolling and controlled cooling, and quenching and tempering after rolling to obtain the Gao Jiangyi welded 700MPa steel plate.
In an alternative embodiment, the sectional rolling and the controlled cooling include a first stage rolling and a second stage rolling and controlled cooling before and after the second stage rolling;
the initial rolling temperature of the first section of rolling is more than 1100 ℃; after rolling, cooling to 800-850 ℃ through ACC, starting the second-stage rolling, and after rolling, cooling to 680-720 ℃ through ACC.
In an alternative embodiment, the quenching process includes:
preserving heat at 920-940 ℃ for 1.5-1.9 min/mm and not less than 30min, and cooling to room temperature after preserving heat.
In an alternative embodiment, the tempering process includes: preserving heat at 550-580 ℃ for 2.5-3 min/mm and not less than 30min;
after heat preservation, NCC is adopted to cool to 350-400 ℃, then air cooling is carried out to room temperature, and rapid cooling of NCC is beneficial to avoiding tempering brittleness.
In a third aspect, the invention provides an application of the Gao Jiangyi welded 700MPa steel plate in engineering equipment.
In alternative embodiments, the engineering equipment comprises bridge equipment, road equipment, or military engineering machinery.
The invention has the following beneficial effects:
the Gao Jiangyi welded 700MPa steel plate provided by the invention has excellent mechanical properties, and the transverse impact energy average value of the steel plate reaches 160J-350J at 40 ℃; stretching at room temperature: the yield strength is more than or equal to 730MPa, the tensile strength is 800-920 MPa, and the elongation after breaking is more than or equal to 17%. At room temperature bending diameter d=3a, bending 180 ° is free from cracking. The carbon equivalent Ceq of the steel plate is less than or equal to 0.50%, and the welding performance is better. The preheating temperature for welding the steel plate is 50-70 ℃, so that the welding difficulty is effectively reduced, and the method is beneficial to application in the field of engineering equipment.
According to the manufacturing method provided by the invention, in the molten steel smelting process, residual oxygen in the molten steel is utilized for decarburization in the refining process, so that the decarburization mode is simplified, and the manufacturing cost is reduced.
The application of the Gao Jiangyi welded 700MPa steel plate in engineering equipment provides a steel plate with better performance for the field of engineering equipment, reduces the processing and welding difficulty, expands the applicable range of the field of engineering equipment, and promotes the development of the field of engineering equipment.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but it will be understood by those skilled in the art that the following embodiments and examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention,% generally refers to weight percent or mass percent unless otherwise indicated.
The EH960 extra thick steel plate for maritime work and the manufacturing method thereof provided by the present invention are specifically described below.
In a first aspect, the invention provides a high-strength easy-to-weld 700MPa steel plate, which is characterized by comprising the following chemical components in percentage by mass:
c:0.03 to 0.06 percent of Si: < 0.10%, mn:2.25% -2.40%, nb:0.075 to 0.09 percent, cr:0.20 to 0.24 percent of Ce:0.01% -0.02%, V:0.12 to 0.13 percent, and the balance of Fe and unavoidable impurities;
wherein the thickness of the steel plate is 10 mm-50 mm.
The Gao Jiangyi welded 700MPa steel plate provided by the invention has excellent mechanical properties, and the transverse impact energy average value of the steel plate reaches 160J-350J at 40 ℃; stretching at room temperature: the yield strength is more than or equal to 730MPa, the tensile strength is 800-920 MPa, and the elongation after breaking is more than or equal to 17%. At room temperature bending diameter d=3a, bending 180 ° is free from cracking. The carbon equivalent Ceq of the steel plate is less than or equal to 0.50%, and the welding performance is better. The preheating temperature for welding the steel plate is 50-70 ℃, so that the welding difficulty is effectively reduced, and the method is beneficial to application in the field of engineering equipment.
For reference, the content of C in the Gao Jiangyi welded 700MPa steel sheet may be 0.03%, 0.04%, 0.05% or 0.06%, or any other value within the range of 0.03% to 0.06%.
The Si content in the Gao Jiangyi welded 700MPa steel sheet may be 0.02%, 0.04%, 0.06% or 0.08%, or may be any other value within the range of < 0.10%.
The Mn content in the Gao Jiangyi welded 700MPa steel plate can be 2.25%, 2.35% or 2.40%, or any other value within the range of 2.25% -2.40%.
The content of Nb in the Gao Jiangyi welded 700MPa steel plate can be 0.075%, 0.085% or 0.090%, or any other value within the range of 0.075% -0.09%.
The Cr content in the Gao Jiangyi welded 700MPa steel sheet may be 0.20%, 0.21%, 0.22%, 0.23% or 0.24%, or any other value within the range of 0.20% to 0.24%.
In the Gao Jiangyi welded 700MPa steel plate, the Ce content can be 0.01%, 0.015% and 0.02%, or any other value within the range of 0.01% -0.02%.
The V content in the Gao Jiangyi welded 700MPa steel plate can be 0.12%, 0.125% or 0.13%, or any other value within the range of 0.12% -0.13%.
In an alternative embodiment, the yield strength of the steel plate is more than or equal to 730MPa, the tensile strength is 800 MPa-920 MPa, the elongation after break is more than or equal to 17%, and the transverse impact energy at minus 40 ℃ is 160J-350J.
In an alternative embodiment, the carbon equivalent Ceq is less than or equal to 0.50%;
wherein ceq=c+mn/6+ (v+mo+cr)/5+ (ni+cu)/15.
In an alternative embodiment, the steel sheet is bent 180 ° without cracking at room temperature bending diameter d=3a.
In a second aspect, the invention provides a manufacturing method of the Gao Jiangyi welded 700MPa steel plate, which comprises the following steps:
A. tapping from the converter when the C content in the molten steel is less than or equal to 0.05%, lifting the molten steel to an LF refining furnace for heating, blowing argon and stirring for 3-8 min, and decarburizing by using residual oxygen in the molten steel to ensure that the C content is less than or equal to 0.03%;
B. continuously adding lime and alumina into an LF refining furnace to prepare white slag, and then adding aluminum particles to deoxidize; continuously adding 400-800 m aluminum wires into molten steel, blowing argon and stirring to remove residual oxygen in the molten steel; adding alloy after slagging is finished to obtain qualified molten steel;
C. the qualified molten steel is processed by a continuous casting machine to obtain a steel billet;
D. and heating the blank, carrying out sectional rolling and controlled cooling, and quenching and tempering after rolling to obtain the Gao Jiangyi welded 700MPa steel plate.
The manufacturing method provided by the invention uses residual oxygen in molten steel to carry out decarburization in the refining process, so that the decarburization mode is simplified, and the manufacturing cost is reduced.
In an alternative embodiment, the sectional rolling includes a first stage rolling and a second stage rolling and controlled cooling;
the initial rolling temperature of the first section of rolling is more than 1100 ℃; after rolling, cooling to 800-850 ℃ through ACC, starting the second-stage rolling, and after rolling, cooling to 680-720 ℃ through ACC.
In an alternative embodiment, the quenching process includes:
preserving heat at 920-940 ℃ for 1.5-1.9 min/mm and not less than 30min, and cooling to room temperature after preserving heat.
In an alternative embodiment, the tempering process includes: preserving heat at 550-580 ℃ for 2.5-3 min/mm and not less than 30min.
The heat preservation time unit is min/mm or min/cm, which means the heat preservation time of the steel plate per millimeter or per centimeter thickness is min; for example, 2.0min/mm means that the holding time per millimeter of thickness of the steel sheet is 2.0min. The specific heat preservation time is obtained by combining the heat preservation time with the thickness of the steel plate.
After heat preservation, NCC is adopted to cool to 350 ℃ to 400 ℃, and then air cooling is carried out to room temperature.
In a third aspect, the invention provides an application of the Gao Jiangyi welded 700MPa steel plate in engineering equipment.
The application of the Gao Jiangyi welded 700MPa steel plate in engineering equipment provides a steel plate with better performance for the field of engineering equipment, reduces the processing and welding difficulty, expands the applicable range of the field of engineering equipment, and promotes the development of the field of engineering equipment.
In alternative embodiments, the engineering equipment comprises bridge equipment, road equipment, or military engineering machinery.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Example 1
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 10mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.05% when the steel is tapped from the molten steel converter; lifting to the LF refining furnace for 7min, heating to 1631 ℃, blowing argon and stirring for 5min, and detecting the C content to be 0.02%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.04%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the blank is 1183 ℃ after being discharged from a heating furnace, the initial rolling temperature of the first section is 1126 ℃, the ACC after rolling is rapidly cooled to 827 ℃, and the ACC after the second section is cooled to 703 ℃.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 930 ℃, and the heat preservation time is 30min and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 565 ℃, the heat preservation time is 30min, then NCC is adopted to cool to 350 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 10 mm.
Example 2
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 16mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.04% when the molten steel converter is tapped; lifting to an LF refining furnace for 10min, heating to 1620 ℃, blowing argon and stirring for 3min, and detecting the C content to be 0.01%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.03%. 2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the blank is 1152 ℃ out of a heating furnace, the initial rolling temperature of the first section is 1103 ℃, the ACC after rolling is rapidly cooled to 804 ℃, and the ACC after the second section is cooled to 715 ℃.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 935 ℃, and the heat preservation time is 30min and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 580 ℃, the heat preservation time is 30min, then NCC is adopted to cool to 400 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 16 mm.
Example 3
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 20mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.05% when the steel is tapped from the molten steel converter; lifting to an LF refining furnace for 10min, heating to 1645 ℃, blowing argon and stirring for 8min, and detecting the C content to be 0.01%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.04%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the heating furnace is 1190 ℃, the initial rolling temperature of the first section is 1125 ℃, the rolled ACC is rapidly cooled to 847 ℃, and the second section is cooled to 682 ℃ through ACC after rolling.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 920 ℃, and the heat preservation time is 38min and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 560 ℃, the heat preservation time is 50min, then NCC is adopted to cool to 360 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 20 mm.
Example 4
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 25mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.03% when the molten steel converter is tapped; lifting to the LF refining furnace for 7min, heating to 1637 ℃, blowing argon and stirring for 6min, and detecting the C content to be 0.01%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.05%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the blank is 1160 ℃ in a heating furnace, the initial rolling temperature of the first section is 1115 ℃, the ACC after rolling is rapidly cooled to 830 ℃, and the ACC after the second section is cooled to 698 ℃.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 930 ℃, and the heat preservation time is 45 minutes and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 570 ℃, the heat preservation time is 70min, then NCC is adopted to cool to 396 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 25 mm.
Example 5
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 30mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.05% when the steel is tapped from the molten steel converter; lifting to an LF refining furnace for 6min, heating to 1650 ℃, blowing argon and stirring for 8min, and detecting the C content to be 0.02%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.06%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the heating furnace is 1167 ℃, the initial rolling temperature of the first section is 1126 ℃, the rolled ACC is rapidly cooled to 847 ℃, and the second section is cooled to 709 ℃ after rolling.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 935 ℃, and the heat preservation time is 57min and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 556 ℃, the heat preservation time is 90min, then NCC is adopted to cool to 372 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 30 mm.
Example 6
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 35mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.04% when the molten steel converter is tapped; lifting to the LF refining furnace for 3min, heating to 1630 ℃, blowing argon and stirring for 5min, and detecting the C content to be 0.02%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.05%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the blank is 1182 ℃ after being discharged from a heating furnace, the initial rolling temperature of the first section is 1131 ℃, the ACC after rolling is rapidly cooled to 826 ℃, and the ACC after the second section is rolled is cooled to 717 ℃.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 925 ℃, and the heat preservation time is 60 minutes and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 571 ℃, the heat preservation time is 95min, then NCC is adopted to cool to 390 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 35 mm.
Example 7
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 40mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.05% when the steel is tapped from the molten steel converter; lifting to an LF refining furnace for 6min, heating to 1657 ℃, blowing argon and stirring for 7min, and detecting the C content to be 0.01%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.05%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the heating furnace is 1167 ℃, the initial rolling temperature of the first section is 1126 ℃, the rolled ACC is rapidly cooled to 847 ℃, and the second section is cooled to 709 ℃ after rolling.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 925 ℃, and the heat preservation time is 70min and then the steel plate is cooled to room temperature; tempering is carried out after quenching, the tempering temperature is 572 ℃, the heat preservation time is 110min, then NCC is adopted to cool to 386 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 40 mm.
Example 8
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 45mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.04% when the molten steel converter is tapped; lifting to an LF refining furnace for 6min, heating to 1650 ℃, blowing argon and stirring for 4min, and detecting the C content to be 0.02%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.06%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the blank is 1153 ℃ in a heating furnace, the initial rolling temperature of the first section is 1107 ℃, the rolled ACC is rapidly cooled to 836 ℃, and the rolled ACC is cooled to 682 ℃ after the second section is rolled.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 930 ℃, and the heat preservation time is 70min and then the steel plate is cooled to room temperature; and after quenching, tempering, wherein the tempering temperature is 566 ℃, the heat preservation time is 120min, then NCC is adopted to cool to 359 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 45 mm.
Example 9
The embodiment provides a high-strength easy-welding 700MPa steel plate with the thickness of 50mm, which comprises the following specific steps:
1. decarburization treatment: the C content is 0.03% when the molten steel converter is tapped; lifting to the LF refining furnace for 6min, heating to 1633 ℃, blowing argon and stirring for 5min, and detecting the C content to be 0.01%. After the decarburization process is finished, lime and alumina balls are added into an LF furnace to make white slag, aluminum particles are added to deoxidize, 400-800 m aluminum wires are added into molten steel in the slag making process, argon blowing and stirring are performed to remove residual oxygen in the molten steel, and Mn, nb, cr, ce and V alloy are added after the slag making is finished; wherein, the white slag is kept for 10-25 min, the final slag after refining is foam white slag with good fluidity and proper viscosity, and in the final slag, the molten steel is carburised due to electrode heating in the alloy and LF refining process, and the final C content is 0.04%.
2. And (5) passing the qualified molten steel through a continuous casting machine to obtain a steel billet.
3. Rolling steel billets: the blank is heated before rolling, the temperature of the blank is 1158 ℃ outside a heating furnace, the initial rolling temperature of the first section is 1113 ℃, the ACC after rolling is rapidly cooled to 819 ℃, and the ACC after the second section is cooled to 681 ℃.
4. And (3) heat treatment: quenching and tempering the steel plate, wherein the quenching and heat preservation temperature is 925 ℃, the heat preservation time is 90min, and then water cooling is carried out to room temperature; tempering is carried out after quenching, the tempering temperature is 570 ℃, the heat preservation time is 140min, then NCC is adopted to cool to 361 ℃, and then air cooling is carried out to room temperature, thus obtaining the Gao Jiangyi welded 700MPa steel plate with the thickness of 50mm.
Test case
The chemical composition of the Gao Jiangyi welded 700MPa steel sheet obtained in examples 1 to 9 was examined, and the results obtained are shown in Table 1 below, with the balance being Fe and unavoidable impurities in Table 1.
TABLE 1 chemical composition data table (%)
| Examples | C | Si | Mn | V | Cr | Ce | Nb |
| 1 | 0.04 | 0.07 | 2.19 | 0.125 | 0.21 | 0.005 | 0.059 |
| 2 | 0.03 | 0.05 | 2.14 | 0.125 | 0.23 | 0.015 | 0.052 |
| 3 | 0.04 | 0.08 | 2.16 | 0.127 | 0.23 | 0.019 | 0.055 |
| 4 | 0.05 | 0.03 | 2.18 | 0.123 | 0.22 | 0.029 | 0.052 |
| 5 | 0.06 | 0.04 | 2.15 | 0.124 | 0.2 | 0.025 | 0.053 |
| 6 | 0.05 | 0.05 | 2.14 | 0.121 | 0.24 | 0.023 | 0.057 |
| 7 | 0.05 | 0.08 | 2.13 | 0.12 | 0.21 | 0.027 | 0.054 |
| 8 | 0.06 | 0.06 | 2.15 | 0.125 | 0.22 | 0.019 | 0.056 |
| 9 | 0.04 | 0.09 | 2.11 | 0.129 | 0.23 | 0.022 | 0.055 |
Test case
The Gao Jiangyi welded 700MPa steel plates obtained in examples 1 to 9 were subjected to performance test, mechanical performance test was performed according to GB/T2975, low temperature impact toughness test was performed according to GB/T229, bending performance test was performed according to GB/T232-2010, and the obtained results are shown in Table 2 below. In Table 2, the thickness of 1/4 of the sheet refers to 1/4 of the thickness of the steel sheet from one surface to the other.
Table 2 performance data table
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The high-strength easy-to-weld 700MPa steel plate is characterized by comprising the following chemical components in percentage by mass:
c:0.03 to 0.06 percent of Si: < 0.10%, mn:2.25% -2.40%, nb:0.075 to 0.09 percent, cr:0.20 to 0.24 percent of Ce:0.01% -0.02%, V:0.12 to 0.13 percent, and the balance of Fe and unavoidable impurities;
wherein the thickness of the steel plate is 10 mm-50 mm.
2. The Gao Jiangyi welded 700MPa steel plate according to claim 1, wherein the steel plate has a yield strength of not less than 730MPa, a tensile strength of 800MPa to 920MPa, an elongation after break of not less than 17%, and a transverse impact energy of 160J to 350J at-40 ℃.
3. The Gao Jiangyi welded 700MPa steel sheet of claim 1, having a carbon equivalent Ceq of 0.50% or less;
wherein ceq=c+mn/6+ (v+mo+cr)/5+ (ni+cu)/15.
4. The Gao Jiangyi welded 700MPa steel sheet of claim 1, which is free of cracking when bent 180 ° at room temperature with a bending diameter d=3a.
5. A method for manufacturing a Gao Jiangyi welded 700MPa steel sheet according to any one of claims 1 to 4, comprising the steps of:
A. tapping from the converter when the C content in the molten steel is less than or equal to 0.05%, lifting the molten steel to an LF refining furnace for heating, blowing argon and stirring for 3-8 min, and decarburizing by using residual oxygen in the molten steel to ensure that the C content is less than or equal to 0.03%;
B. continuously adding lime and alumina into an LF refining furnace to prepare white slag, and then adding aluminum particles to deoxidize; continuously adding 400-800 m aluminum wires into molten steel, blowing argon and stirring to remove residual oxygen in the molten steel; adding alloy after slagging is completed to obtain qualified molten steel and qualified molten steel;
C. the qualified molten steel is processed by a continuous casting machine to obtain a steel billet;
D. and heating the blank, carrying out sectional rolling and controlled cooling, and quenching and tempering after rolling to obtain the Gao Jiangyi welded 700MPa steel plate.
6. The method of manufacturing according to claim 5, wherein the sectional rolling and controlled cooling includes a first stage rolling and a second stage rolling and controlled cooling after rolling;
the initial rolling temperature of the first section of rolling is more than 1100 ℃; after rolling, cooling to 800-850 ℃ through ACC, starting the second-stage rolling, and after rolling, cooling to 680-720 ℃ through ACC.
7. The method of manufacturing according to claim 5, wherein the quenching process includes:
preserving heat at 920-940 ℃ for 1.5-1.9 min/mm and not less than 30min, and cooling to room temperature after preserving heat.
8. The method of manufacturing according to claim 5, wherein the tempering process comprises: preserving heat at 550-580 ℃ for 2.5-3 min/mm and not less than 30min;
and (3) cooling to 350-400 ℃ by adopting NCC after discharging, and then air-cooling to room temperature.
9. Use of a Gao Jiangyi welded 700MPa steel sheet according to any one of claims 1 to 4 or a Gao Jiangyi welded 700MPa steel sheet obtained by the manufacturing method according to any one of claims 5 to 8 in engineering equipment.
10. The use according to claim 9, wherein the engineering equipment comprises bridge equipment, road equipment or military engineering machinery.
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