CN115198200A - High-strength steel plate for marine storage tank and manufacturing method thereof - Google Patents
High-strength steel plate for marine storage tank and manufacturing method thereof Download PDFInfo
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- CN115198200A CN115198200A CN202210781838.3A CN202210781838A CN115198200A CN 115198200 A CN115198200 A CN 115198200A CN 202210781838 A CN202210781838 A CN 202210781838A CN 115198200 A CN115198200 A CN 115198200A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000003860 storage Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 26
- 238000005516 engineering process Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 238000009749 continuous casting Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000009628 steelmaking Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 229910001563 bainite Inorganic materials 0.000 claims description 3
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract description 2
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000009919 sequestration Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
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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
- C21D8/0221—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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C22C38/02—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
- C22C38/06—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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a high-strength steel plate for a marine storage tank and a manufacturing method thereof, which relate to the technical field of steel production and comprise the following chemical components in percentage by weight: c: 0.08-0.12%, mn:1.00% -1.50%, si: 0.10-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.03%, cr:0.20% -0.50%, mo: 0.20-0.50%, ni:1.20% -2.00%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities. The tempering temperature of the subsequent steel plate is increased to 650-680 ℃ through the fine grain, dislocation and precipitation strengthening effects of microalloy elements, the performance after SR postweld heat treatment at the maximum temperature of 620 ℃ is met, and the construction requirements of large-scale, low-temperature and high-pressure storage tanks are met.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a high-strength steel plate for a marine storage tank and a manufacturing method thereof.
Background
Carbon Capture and Sequestration (CCS) is an important component of the decarbonization society, and the liquefaction of discharged carbon dioxide followed by geological sequestration and marine sequestration is considered as a negative emission technology for carbon neutralization, and the marine transportation capital expenditure is low, which is a preferred solution for transporting a small amount of carbon dioxide in the initial stage to a few available sequestration sites. The steel for the storage tank of the core equipment material for the marine transport ship is required to have the performances of high strength, low temperature resistance, easy welding, crack resistance and the like, and meets the safety service requirements of easy manufacture, high pressure resistance, low temperature resistance and the like of the storage tank manufacture.
In the national standard GB 19189 quenched and tempered high-strength steel plate for pressure vessels, the highest grade of the steel for the high-strength storage tank is 610 MPa-grade tensile strength steel, and the requirement that the impact value is more than or equal to 80J at minus 50 ℃ is met. In the European EN10028-6 standard 'quenching and tempering weldable fine grain steel', the P690QL2 mark is a 770 MPa-level tensile strength steel material, and meets the requirement that the impact value at the temperature of minus 60 ℃ is more than or equal to 27J.
The invention discloses an 800 MPa-grade ship steel 5363 with the application number of 201610538979.7 and a preparation method thereof, the invention designs the Ni content to be 3.5-5.5% and the Ni alloy content to be high, and the invention researches low-temperature impact and NDT performances and does not research low-temperature CTOD crack arrest performance.
The invention discloses an ultra-thick 800 MPa-grade quenched and tempered steel plate with excellent core low-temperature impact toughness and weldability and a manufacturing method thereof, which are disclosed in application No. 202010579577.8, the steel plate only meets the impact requirement at the temperature of-40 ℃, and two quenching heat treatments are required in the production process, namely the first quenching temperature is 900-930 ℃, the quenching holding time is more than or equal to 15min, the second quenching temperature is 870-900 ℃, the quenching holding time is more than or equal to 10min, the production process is complex, the process cost is high, and the low-temperature CTOD crack arrest performance is not researched.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a high-strength steel plate for a marine storage tank, which comprises the following chemical components in percentage by weight: c: 0.08-0.12%, mn:1.00% -1.50%, si: 0.10-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.03%, cr: 0.20-0.50%, mo: 0.20-0.50%, ni:1.20% -2.00%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities.
The technical scheme of the invention is further defined as follows:
the high-strength steel plate for the marine storage tank comprises the following chemical components in percentage by weight: c: 0.08-0.10%, mn:1.00% -1.40%, si: 0.10-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.03%, cr:0.30% -0.40%, mo:0.30% -0.40%, ni:1.20% -1.60%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities.
The high-strength steel plate for the marine storage tank comprises the following chemical components in percentage by weight: c: 0.10-0.12%, mn:1.00% -1.20%, si: 0.20-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.02%, cr:0.40% -0.50%, mo: 0.30-0.50%, ni:1.60% -2.00%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities.
Another object of the present invention is to provide a method for manufacturing a high-strength steel sheet for a marine storage tank, comprising the steps of:
a steel making process: adopting a converter deep dehydration P technology and an LF deep dehydration S technology; the continuous casting adopts the dynamic soft reduction and electromagnetic stirring technology to provide high-quality blanks for subsequent rolling;
a heating procedure: heating the casting blank in a heating furnace at 1180-1220 ℃ with a heating coefficient of 10.0-14.0 min/cm;
a rolling procedure: a 2-stage controlled rolling process is adopted, the final temperature of the first-stage rough rolling is more than or equal to 1000 ℃, and the final reduction rate of 2 passes is more than or equal to 15%; the second stage of low-temperature rolling, wherein the finish rolling temperature is 780-820 ℃;
a cooling process: firstly, relaxation control is carried out on the rolled steel plate, and the steel plate is put into an ultra-fast cooling system to be rapidly cooled to room temperature when the temperature is reduced to 700-740 ℃;
a heat treatment process: the tempering temperature of the steel plate is 650-680 ℃, and the time in the furnace is (2.5H + 20) - (2.5H + 60), wherein H is the thickness of the steel plate and is unit mm.
In the method for manufacturing the high-strength steel plate for the marine storage tank, the maximum thickness of the steel plate is 50mm.
According to the manufacturing method of the high-strength steel plate for the marine storage tank, the yield strength of the steel plate is more than or equal to 690MPa, the tensile strength is 770-940 MPa, the low-temperature impact energy at minus 80 ℃ is more than or equal to 120J, and the CTOD characteristic value at minus 35 ℃ is more than or equal to 0.25mm.
According to the manufacturing method of the high-strength steel plate for the marine storage tank, the proportion of 15-degree large-angle grain boundaries of the steel plate is improved, and the soft and hard phase structure of lower bainite and polygonal ferrite is obtained.
The invention has the beneficial effects that:
(1) The steel for the 800 MPa-grade high-strength storage tank is designed by adopting low-carbon (less than or equal to 0.12%) components, the hardenability of the steel is improved by proper Cr and Mo elements, the low-temperature toughness is improved by proper Ni elements, the proportion of 15-degree large-angle grain boundaries is improved by controlling a relaxation technology after rolling, an on-line quenching technology, an off-line tempering technology and the like, the soft-hard phase structure of lower bainite and polygonal ferrite is obtained, and the steel for the 800 MPa-grade high-strength storage tank is developed, wherein the maximum thickness of the steel plate is 50mm, the low-temperature impact performance of the steel plate is excellent, the low-temperature impact power at-80 ℃ is more than or equal to 120J, and the CTOD characteristic value at-35 ℃ is more than or equal to 0.25mm;
(2) The invention improves the tempering temperature of the subsequent steel plate to 650-680 ℃ by the fine grain, dislocation and precipitation strengthening action of the microalloy elements, meets the performance of SR postweld heat treatment at the maximum temperature of 620 ℃, meets the construction requirement of large-scale storage tanks, and has the comprehensive mechanical property index higher than the level of similar steel at home and abroad;
(3) The steel for the 800 MPa-grade high-strength storage tank has the advantages of good low-temperature impact, CTOD crack arrest performance, welding performance and the like of a steel plate, large market demand and good economic benefit.
Detailed Description
Example 1
The embodiment provides a high-strength steel plate for a marine storage tank, the thickness of the steel plate is 50mm, and the manufacturing method comprises the following steps:
a steel-making process: the content (wt) of the components is as follows: c:0.08%, si:0.23%, mn:1.21%, P:0.009%, S:0.002%, alt:0.031%, nb:0.024%, V:048%, ti:0.014%, cr:0.35%, mo:0.39%, ni:1.57%, B:0.0014%, CEV:0.54%, pcm:0.22 percent, and the balance of Fe and impurities, smelting according to the components, and obtaining a 320mm continuous casting billet through converter smelting, LF + RH refining, continuous casting dynamic soft reduction and electromagnetic stirring technology;
a heating procedure: the heating temperature of the steel billet is 1199 ℃, and the heating coefficient is 10.8min/cm;
a rolling procedure: a 2-stage controlled rolling process is adopted, the final temperature of the first-stage rough rolling is 1014 ℃, and the final reduction rate of 2 passes is 20.4 percent and 18.9 percent; the start rolling temperature of the second stage is 837 ℃, and the finish rolling temperature is 805 ℃;
and (3) a cooling process: firstly, relaxation control is carried out on the rolled steel plate, and the steel plate is put into an ultra-fast cooling system to be rapidly cooled to room temperature when the temperature is reduced to 732 ℃ later;
a heat treatment process: the tempering temperature of the steel plate is 656 ℃, and the furnace time is 175 minutes.
The mechanical properties of the steel plate with the specification are as follows: yield strength 783MPa, tensile strength 825MPa, elongation after fracture 19%, impact energy Akv at-80 ℃:129J, 131J and 241J, and the average value of the CTOD characteristic value is 0.42mm at the temperature of-35 ℃ measured according to the ISO 12135 standard.
Example 2
The high-strength steel plate for the marine storage tank provided by the embodiment has the thickness of 40mm, and the manufacturing method comprises the following steps:
a steel making process: the contents of the components (wt): c:0.09%, si:0.26%, mn:1.12%, P:0.008%, S:0.003%, alt:0.036%, nb:0.021%, V:043%, ti:0.013%, cr:0.29%, mo:0.35%, ni:1.76%, B:0.0013%, CEV:0.53%, pcm:0.22 percent, and the balance of Fe and impurities, smelting according to the components, and obtaining a 320mm continuous casting billet through converter smelting, LF + RH refining, continuous casting dynamic soft reduction and electromagnetic stirring technology;
a heating procedure: the heating temperature of the steel billet is 1205 ℃, and the heating coefficient is 11.7min/cm;
a rolling procedure: a 2-stage controlled rolling process is adopted, the temperature of the first-stage rough rolling is 1023 ℃, and the reduction rate of the last 2 passes is 21.2 percent and 19.3 percent; the second stage has the initial rolling temperature of 826 ℃ and the final rolling temperature of 798 ℃;
and (3) a cooling process: firstly, relaxation control is carried out on the rolled steel plate, and the steel plate is put into an ultra-fast cooling system to be rapidly cooled to room temperature when the temperature is reduced to 726 ℃;
a heat treatment process: the tempering temperature of the steel plate is 668 ℃, and the furnace time is 145 minutes.
The mechanical properties of the steel plate with the specification are as follows: yield strength 802MPa, tensile strength 838MPa, elongation after fracture 19.5%, impact energy Akv at-80 deg.C: 192J, 150J and 154J, and the average value of the CTOD characteristic value is 0.47mm at the temperature of-35 ℃ measured according to the ISO 12135 standard.
Example 3
The embodiment provides a high-strength steel plate for a marine storage tank, the thickness of the steel plate is 20mm, and the manufacturing method comprises the following steps:
a steel making process: the component contents are (wt): c:0.10%, si:0.19%, mn:0.98%, P:0.010%, S:0.004%, alt:0.034%, nb:0.016%, V:038%, ti:0.016%, cr:0.41%, mo:0.27%, ni:1.24%, B:0.0016, CEV:0.49%, pcm:0.22 percent, and the balance of Fe and impurities, smelting according to the components, and obtaining a continuous casting billet with the thickness of 260mm by converter smelting, LF + RH refining, continuous casting dynamic soft reduction and electromagnetic stirring technology;
a heating procedure: the heating temperature of the steel billet is 1211 ℃, and the heating coefficient is 12.4min/cm;
a rolling procedure: a 2-stage controlled rolling process is adopted, the final temperature of the first-stage rough rolling is 1014 ℃, and the final reduction rate of 2 passes is 22.4 percent and 19.8 percent; the second stage has a beginning rolling temperature of 809 ℃ and a finishing rolling temperature of 783 ℃;
and (3) a cooling process: firstly, relaxation control is carried out on the rolled steel plate, and the steel plate is quickly cooled to room temperature in an ultra-fast cooling system when the temperature is reduced to 717 ℃;
a heat treatment process: the tempering temperature of the steel plate is 671 ℃, and the furnace time is 85 minutes.
The mechanical properties of the steel plate with the specification are as follows: yield strength 833MPa, tensile strength 869MPa, elongation after fracture 18%, impact energy Akv at-80 ℃:190J, 186J and 195J, and the average value of the CTOD characteristic values at-35 ℃ is 0.50mm according to the ISO 12135 standard.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a marine high strength steel sheet for storage tank which characterized in that: the chemical components of the material by weight percentage are as follows: c:0.08 to 0.12 percent, mn:1.00% -1.50%, si: 0.10-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.03%, cr:0.20% -0.50%, mo: 0.20-0.50%, ni:1.20% -2.00%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities.
2. The high-strength steel sheet for a marine storage tank as set forth in claim 1, wherein: the chemical components of the material by weight percentage are as follows: c: 0.08-0.10%, mn:1.00% -1.40%, si: 0.10-0.30%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.03%, cr:0.30% -0.40%, mo:0.30% -0.40%, ni: 1.20-1.60%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities.
3. The high-strength steel sheet for a marine storage tank as set forth in claim 1, wherein: the chemical components of the material by weight percentage are as follows: c: 0.10-0.12%, mn:1.00% -1.20%, si: 0.20-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb is less than or equal to 0.02%, cr:0.40% -0.50%, mo:0.30% -0.50%, ni:1.60% -2.00%, alt: 0.020-0.060%, CEV less than or equal to 0.54%, pcm less than or equal to 0.23%, and the balance of Fe and impurities.
4. A manufacturing method of a high-strength steel plate for a marine storage tank is characterized by comprising the following steps: use according to any one of claims 1 to 3, comprising the steps of:
a steel making process: adopting a converter deep dehydration P technology and an LF deep dehydration S technology; the continuous casting adopts the dynamic soft reduction and electromagnetic stirring technology to provide high-quality blanks for subsequent rolling;
a heating procedure: heating the casting blank in a heating furnace at 1180-1220 ℃ with the heating coefficient of 10.0-14.0 min/cm;
a rolling procedure: a 2-stage controlled rolling process is adopted, the final temperature of the first-stage rough rolling is more than or equal to 1000 ℃, and the final reduction rate of 2 passes is more than or equal to 15%; the second stage of low-temperature rolling, wherein the finish rolling temperature is 780-820 ℃;
a cooling process: firstly, relaxation control is carried out on the rolled steel plate, and the steel plate is put into an ultra-fast cooling system to be rapidly cooled to room temperature when the temperature is reduced to 700-740 ℃;
a heat treatment process: the tempering temperature of the steel plate is 650-680 ℃, and the time in the furnace is (2.5H + 20) - (2.5H + 60), wherein H is the thickness of the steel plate and is unit mm.
5. The method for manufacturing a high-strength steel sheet for a marine storage tank as claimed in claim 4, wherein: the maximum thickness of the steel plate is 50mm.
6. The method for manufacturing a high-strength steel sheet for a marine storage tank according to claim 4, wherein: the yield strength of the steel plate is more than or equal to 690MPa, the tensile strength is 770-940 MPa, the low-temperature impact energy at minus 80 ℃ is more than or equal to 120J, and the CTOD characteristic value at minus 35 ℃ is more than or equal to 0.25mm.
7. The method for manufacturing a high-strength steel sheet for a marine storage tank according to claim 4, wherein: the proportion of 15-degree large-angle grain boundaries of the steel plate is improved, and the soft and hard phase structure of lower bainite and polygonal ferrite is obtained.
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| CN202210781838.3A CN115198200A (en) | 2022-07-05 | 2022-07-05 | High-strength steel plate for marine storage tank and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747616A (en) * | 2022-11-29 | 2023-03-07 | 南京钢铁股份有限公司 | Smelting method of P690QL2 marine storage tank steel |
| CN116043135A (en) * | 2022-12-14 | 2023-05-02 | 鞍钢股份有限公司 | Ultra-high toughness P690QL2 steel plate and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775559A (en) * | 2010-03-17 | 2010-07-14 | 北京科技大学 | Easily welded high-strength-and-toughness ship plate steel and production process |
| CN112342458A (en) * | 2020-09-01 | 2021-02-09 | 南京钢铁股份有限公司 | Low-yield-ratio stress corrosion cracking resistant high-strength steel and preparation method thereof |
| KR20210092244A (en) * | 2018-12-05 | 2021-07-23 | 난징 아이론 앤드 스틸 컴퍼니 리미티드 | Low-temperature steel plate and manufacturing method for ship VOC storage tank in TMCP state |
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2022
- 2022-07-05 CN CN202210781838.3A patent/CN115198200A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775559A (en) * | 2010-03-17 | 2010-07-14 | 北京科技大学 | Easily welded high-strength-and-toughness ship plate steel and production process |
| KR20210092244A (en) * | 2018-12-05 | 2021-07-23 | 난징 아이론 앤드 스틸 컴퍼니 리미티드 | Low-temperature steel plate and manufacturing method for ship VOC storage tank in TMCP state |
| CN112342458A (en) * | 2020-09-01 | 2021-02-09 | 南京钢铁股份有限公司 | Low-yield-ratio stress corrosion cracking resistant high-strength steel and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115747616A (en) * | 2022-11-29 | 2023-03-07 | 南京钢铁股份有限公司 | Smelting method of P690QL2 marine storage tank steel |
| CN116043135A (en) * | 2022-12-14 | 2023-05-02 | 鞍钢股份有限公司 | Ultra-high toughness P690QL2 steel plate and manufacturing method thereof |
| CN116043135B (en) * | 2022-12-14 | 2024-02-13 | 鞍钢股份有限公司 | Ultra-high toughness P690QL2 steel plate and manufacturing method thereof |
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