WO2022124633A1 - 극저온 인성이 우수한 압력용기용 강판 및 이의 제조방법 - Google Patents
극저온 인성이 우수한 압력용기용 강판 및 이의 제조방법 Download PDFInfo
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- WO2022124633A1 WO2022124633A1 PCT/KR2021/017164 KR2021017164W WO2022124633A1 WO 2022124633 A1 WO2022124633 A1 WO 2022124633A1 KR 2021017164 W KR2021017164 W KR 2021017164W WO 2022124633 A1 WO2022124633 A1 WO 2022124633A1
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- Prior art keywords
- steel sheet
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- pressure vessel
- steel plate
- cryogenic
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
- 238000005496 tempering Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 238000003303 reheating Methods 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910001563 bainite Inorganic materials 0.000 claims description 10
- 229910001566 austenite Inorganic materials 0.000 claims description 9
- 229910000734 martensite Inorganic materials 0.000 claims description 9
- 230000000717 retained effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 17
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 6
- 239000011572 manganese Substances 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000001771 impaired effect Effects 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 241000428199 Mustelinae Species 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000003918 fraction a Anatomy 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D1/84—Controlled slow cooling
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
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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
- C21D8/0205—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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the present invention relates to a steel sheet for a pressure vessel having excellent cryogenic toughness and a method for manufacturing the same.
- High-strength high-strength steel plate for low-temperature use must be able to be used as a structural material for cryogenic use itself during construction, so high-strength and cryogenic toughness properties are required.
- a high-strength hot-rolled steel manufactured through a normal normalizing process has a mixed structure of ferrite and pearlite, and as an example of the prior art, the invention described in Korean Patent Application Laid-Open No. 2012-0011289 can be cited.
- Patent Document 0001 Republic of Korea Patent Publication No. 2012-0011289 (2012.02.07)
- An object of the present invention is to provide a steel sheet for a cryogenic pressure vessel having high strength and excellent cryogenic toughness and a method for manufacturing the same.
- the present invention relates to a steel sheet for a cryogenic pressure vessel having a tensile strength of 750 MPa class, and having strength and lateral expansion characteristics that can be used stably at a cryogenic temperature of -150° C. or less, and a method for manufacturing the same.
- One aspect of the present invention for achieving the above object is by weight%, C: 0.05 to 0.15%, Si: 0.20 to 0.35%, Mn: 0.5 to 1.5%, P: 0.012% or less, S: 0.015% or less, Al Reheating the slab containing: 0.02 to 0.10%, Ni: 6.01 to 6.49%, Mo: 0.2 to 0.4%, Cr: 0.05 to 0.25%, and the balance of Fe and unavoidable impurities; hot rolling and air cooling the reheated steel sheet; First heat-treating the air-cooled steel sheet at 800 to 880° C. for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness (mm) of the slab] and first water cooling; The first water-cooled steel sheet at 700 to 780 ° C. ⁇ 2.4 ⁇ t +
- It relates to a method for manufacturing a steel plate for a container.
- C 0.05 to 0.15%
- Si 0.20 to 0.35%
- Mn 0.5 to 1.5%
- P 0.012% or less
- S 0.015% or less
- Al 0.02 to 0.10%
- Ni 6.01 to 6.49%
- Mo 0.2 to 0.4%
- Cr 0.05 to 0.25%
- the steel microstructure is 1 to 9.5% of retained austenite based on area fraction
- It relates to a steel sheet for a cryogenic pressure vessel consisting of a three-phase mixed structure of tempered bainite 40 to 80%, and the remainder tempered martensite.
- the method for manufacturing a steel sheet for a cryogenic pressure vessel according to the present invention according to the present invention is performed by performing a process of heat-treating an air-cooled steel sheet twice at a temperature of 800 to 880°C and 700 to 780°C after hot rolling, thereby remaining based on area fraction
- a steel sheet for a cryogenic pressure vessel having a steel microstructure of a three-phase mixed structure of austenite 1 to 9.5%, tempered bainite 40 to 80%, and the remainder tempered martensite can be manufactured.
- the steel sheet for cryogenic pressure vessel may have strength and lateral expansion characteristics that can be used stably at a cryogenic temperature of -150° C. or less.
- the steel sheet for cryogenic pressure vessels has excellent strength characteristics of yield strength of 610 MPa or more and tensile strength of 750 MPa or more, and has excellent cryogenic toughness characteristics of 190J or more of Charpy impact energy at -195°C.
- the steel sheet for cryogenic pressure vessels is composed of a three-phase mixed structure of retained austenite 1 to 9.5%, tempered bainite 40 to 80%, and the remainder tempered martensite, so it can have excellent lateral expansion characteristics of 30% or more of elongation. .
- One aspect of the present invention is by weight%, C: 0.05 to 0.15%, Si: 0.20 to 0.35%, Mn: 0.5 to 1.5%, P: 0.012% or less, S: 0.015% or less, Al: 0.02 to 0.10%, Reheating the slab containing Ni: 6.01 to 6.49%, Mo: 0.2 to 0.4%, Cr: 0.05 to 0.25%, and the balance Fe and unavoidable impurities; hot rolling and air cooling the reheated steel sheet; First heat-treating the air-cooled steel sheet at 800 to 880° C. for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness (mm) of the slab] and first water cooling; Secondary heat treatment for the first water-cooled steel sheet at 700 to 780 ° C.
- the method for manufacturing a steel sheet for a cryogenic pressure vessel performs a process of heat-treating an air-cooled steel sheet twice at a temperature of 800 to 880°C and 700 to 780°C after hot rolling, so that residual austen A steel sheet for a cryogenic pressure vessel having a steel microstructure of a three-phase mixed structure of nitrite 1 to 9.5%, tempered bainite 40 to 80%, and the remainder tempered martensite can be manufactured.
- the steel sheet for cryogenic pressure vessel may have strength and lateral expansion characteristics that can be used stably at a cryogenic temperature of -150° C. or less. Specifically, the steel sheet for cryogenic pressure vessel has excellent strength characteristics of yield strength of 610 MPa or more and tensile strength of 750 MPa or more, and Charpy impact energy at -195 ° C. It can have excellent cryogenic toughness characteristics of 190J or more.
- the steel sheet for cryogenic pressure vessels is composed of a three-phase mixed structure of retained austenite 1 to 9.5%, tempered bainite 40 to 80%, and the remainder tempered martensite, so it can have excellent lateral expansion characteristics of 30% or more of elongation. .
- the unit is % by weight.
- the content of carbon (C) may be 0.05 to 0.15%. This is because, when the content of C is less than 0.05%, the strength of the matrix itself is lowered, and when it exceeds 0.15%, the weldability of the steel sheet is greatly impaired.
- a more preferable lower limit may be 0.07%, and a more preferable upper limit may be 0.13%.
- the content of silicon (Si) may be 0.20 to 0.35%.
- Si is a component added for the deoxidation effect, the solid solution strengthening effect, and the impact transition temperature increasing effect, and it is preferable to add 0.20% or more in order to achieve such an additive effect.
- a more preferable lower limit may be 0.23%, and a more preferable upper limit may be 0.32%.
- the content of manganese (Mn) may be 0.5 to 1.5%.
- Mn forms MnS, which is a non-metallic inclusion stretched together with S, to reduce room temperature elongation and low temperature toughness, so it is preferable to manage it at 1.5% or less.
- the amount of Mn added is preferably limited to 0.5 to 1.5%.
- a more preferable lower limit may be 0.52%, and a more preferable upper limit may be 1.2%.
- the content of aluminum (Al) may be 0.02 to 0.10%.
- Al is one of the strong deoxidizers in the steelmaking process together with Si, and when it is less than 0.02%, the effect is insignificant, and when 0.10% or more is added, the manufacturing cost increases, so it is preferable to limit the content to 0.02 to 0.10%.
- a more preferable lower limit may be 0.025%, and a more preferable upper limit may be 0.09%.
- phosphorus (P) is an element that impairs low-temperature toughness, but it requires an excessive cost to remove it in the steelmaking process, so it is desirable to manage it within the range of 0.012% or less.
- sulfur (S) is also an element that adversely affects low-temperature toughness along with P, but like P, it may take an excessive cost to remove it in the steelmaking process, so 0.015% or less It is appropriate to manage within.
- the content of nickel (Ni) may be 6.01 to 6.49%.
- Ni is the most effective element for improving low-temperature toughness.
- the addition amount is less than 6.01%, it causes a decrease in low-temperature toughness, and if it is added in excess of 6.49%, it causes an increase in manufacturing cost, so it is preferably added within the range of 6.01 to 6.49%.
- a more preferable lower limit may be 6.08%, and a more preferable upper limit may be 6.45%.
- molybdenum (Mo) is a very important element for improving hardenability and strength, and addition of less than 0.2% cannot expect the effect, and since it is an expensive element, 0.2 to 0.4% It is preferable to limit it to More preferably, it may be 0.32% or less.
- chromium (Cr) is an important element capable of securing strength even at low temperature and room temperature. Since the addition of less than 0.05% cannot expect the effect and is an expensive element, it is preferable to limit it to 0.05 to 0.25%. A more preferable upper limit may be 0.22%.
- the remaining component is iron (Fe).
- Fe iron
- the steel sheet for cryogenic pressure vessel according to the present invention is subjected to two heat treatment processes, and thus retained austenite 1 to 9.5%, tempered bainite 40 to 80%, and the remainder tempered martens based on the area fraction It may have a steel microstructure consisting of a three-phase mixed structure of the site. Through this, it is possible to secure a steel sheet for cryogenic pressure vessels with excellent strength and low-temperature toughness characteristics.
- the area fraction of tempered bainite is less than 40%, the amount of tempered martensite may be excessive, so that the low-temperature toughness of the steel sheet may be deteriorated, and it may be difficult to secure an elongation of 30% or more.
- the area fraction of tempered bainite exceeds 80%, it may be difficult to secure the target strength of the steel sheet.
- the area fraction of retained austenite is less than 1.0%, low-temperature toughness properties may be impaired and it may be difficult to secure an elongation of 30% or more.
- it exceeds 9.5% the strength is lowered, so it is preferable to limit it to a range of 1.0 to 9.5%.
- the method for manufacturing a steel sheet for a cryogenic pressure vessel comprises the steps of reheating the slab; hot rolling and air cooling the reheated steel sheet; First heat-treating the air-cooled steel sheet at 800 to 880° C. for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness (mm) of the slab] and first water cooling; Secondary heat treatment for the first water-cooled steel sheet at 700 to 780 ° C. for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness (mm) of the slab] and secondary water cooling; and tempering the secondary water-cooled steel sheet.
- a slab satisfying the above-described composition is prepared.
- Molten steel whose composition is adjusted to the above-mentioned composition in the steelmaking step can be manufactured into a slab through continuous casting. Since the slab composition and content have been described above, the overlapping description will be omitted.
- the manufactured slab is reheated.
- the subsequent hot rolling process can be smoothly performed, and the slab can be homogenized.
- Slab reheating temperature may be 1000 to 1200 °C. When the reheating temperature is less than 1000°C, it is difficult to dissolve the solute atoms, whereas when it exceeds 1200°C, the austenite grain size becomes too coarse, which is undesirable because it impairs the physical properties of the steel.
- the heated slab is hot-rolled to manufacture a hot-rolled steel sheet.
- hot rolling is performed at a reduction ratio of 5 to 30% per pass, and rolling can be finished at a temperature of 780° C. or higher.
- the end of rolling is preferably completed at a temperature of 780°C or higher.
- the upper limit of the rolling end temperature is not particularly limited, but may be 900°C.
- Hot-rolled steel sheet after hot rolling can be air-cooled.
- the air cooling method is not particularly limited, and it is sufficient if it is carried out under the conditions used in the art.
- the air-cooled steel sheet may be subjected to primary heat treatment, specifically, heated at 800 to 880° C. for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness of the slab (mm)], and primary water cooling will go through a process If the heat treatment temperature before water cooling is less than 800°C, austenitization does not occur, making it difficult to secure target strength and elongation. If it exceeds 880°C, the grain size is too coarse, which impairs toughness.
- the primary water cooling is performed at a temperature of 150° C. or less, and when the water cooling temperature exceeds 150° C., the strength of the steel sheet may be reduced.
- the water-cooled steel sheet may be subjected to secondary heat treatment, specifically, heated at 700 to 780° C. for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness of the slab (mm)], and secondary water cooling will go through a process If the heat treatment temperature before water cooling is less than 700°C, it is difficult to re-dissolve solid-solute elements, making it difficult to secure target strength and elongation.
- the secondary water cooling is also performed at a temperature of 150° C. or less, and when the water cooling temperature exceeds 150° C., the strength of the steel sheet may be reduced.
- the secondary water-cooled steel sheet can be tempered, and specifically, it can be tempered for ⁇ 2.4 ⁇ t + (10 to 40) ⁇ minutes [t: thickness (mm) of the slab] in a temperature range of 600 to 750 ° C. have. If the temperature during the tempering treatment is less than 600 °C, it is difficult to precipitation of fine precipitates, so it is difficult to secure the target strength.
- the holding time is less than ⁇ (2.4 ⁇ t)+10 ⁇ minutes during the tempering treatment in the above temperature range, it is difficult to homogenize the tissue, whereas if it exceeds ⁇ (2.4 ⁇ t)+40 ⁇ minutes, it is not preferable because it impairs productivity. Can not do it.
- the air-cooled sheet material was subjected to primary heat treatment, secondary heat treatment and tempering at the temperature and time shown in Table 2 below to obtain a steel sheet for a cryogenic pressure vessel.
- water cooling treatment was performed at 150 ° C. or less.
- the notched specimen was subjected to a Charpy impact test and evaluated as a Charpy impact energy (Ec, charpy impact energy, J) value.
- Ec Charpy impact energy
- the steel microstructure after tempering treatment had an area fraction of 1.0 to 9.5% of retained austenite. (RO) and a three-phase mixed structure of 40-80% tempered bainite (TB) and the remainder tempered martensite (TM) can be obtained, and yield strength and tensile strength are about 100 MPa compared to Comparative Example It was found that the elongation was improved by more than 5% while being high, and the cryogenic impact energy at -195°C was also increased by more than 150J.
- RO area fraction of 1.0 to 9.5% of retained austenite.
- TB tempered bainite
- TM remainder tempered martensite
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Abstract
Description
Claims (2)
- 중량%로, C: 0.05 내지 0.15%, Si: 0.20 내지 0.35%, Mn: 0.5 내지 1.5%, P: 0.012% 이하, S: 0.015% 이하, Al: 0.02 내지 0.10%, Ni: 6.01 내지 6.49%, Mo: 0.2 내지 0.4%, Cr: 0.05 내지 0.25% 및 잔부의 Fe와 불가피한 불순물을 포함하는 슬라브를 재가열하는 단계;상기 재가열된 강판을 열간압연하고 공냉하는 단계;상기 공냉된 강판을 800 내지 880℃에서 {2.4×t + (10 내지 40)}분 [t: 슬라브의 두께(㎜)] 동안 1차 열처리하고 1차 수냉하는 단계;상기 1차 수냉된 강판을 700 내지 780℃에서 {2.4×t + (10 내지 40)}분 [t: 슬라브의 두께(㎜)] 동안 2차 열처리하고 2차 수냉하는 단계; 및상기 2차 수냉된 강판을 템퍼링(tempering)하는 단계;를 포함하는 극저온 압력용기용 강판의 제조방법.
- 중량%로, C: 0.05 내지 0.15%, Si: 0.20 내지 0.35%, Mn: 0.5 내지 1.5%, P: 0.012% 이하, S: 0.015% 이하, Al: 0.02 내지 0.10%, Ni: 6.01 내지 6.49%, Mo: 0.2 내지 0.4%, Cr: 0.05 내지 0.25%, 및 잔부의 Fe와 불가피한 불순물을 포함하며,강 미세조직은 면적분율 기준 잔류 오스테나이트 1 내지 9.5%, 템퍼드 베이나이트 40 내지 80%, 및 잔부 템퍼드 마르텐사이트의 3상 혼합조직으로 이루어진 극저온 압력용기용 강판.
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JP2023535047A JP2023554296A (ja) | 2020-12-10 | 2021-11-22 | 極低温靭性に優れた圧力容器用鋼板及びその製造方法 |
US18/265,122 US20240002970A1 (en) | 2020-12-10 | 2021-11-22 | Steel plate for pressure vessel with excellent cryogenic toughness, and method of manufacturing same |
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JPH07109544A (ja) * | 1993-10-08 | 1995-04-25 | Nippon Steel Corp | 靱性の良い低降伏比厚鋼板 |
KR20040054198A (ko) * | 2002-12-18 | 2004-06-25 | 주식회사 포스코 | 저온인성이 우수한 고장력 강판의 제조방법 |
KR20120011289A (ko) | 2010-07-28 | 2012-02-07 | 현대제철 주식회사 | 가공성이 용이한 500MPa급 LPG용 고강도 강재 제조방법 및 그 강재 |
KR20150023724A (ko) * | 2012-07-23 | 2015-03-05 | 제이에프이 스틸 가부시키가이샤 | Ni 함유 후강판 |
JP2015086403A (ja) * | 2013-10-28 | 2015-05-07 | Jfeスチール株式会社 | 低温用鋼板およびその製造方法 |
WO2019239761A1 (ja) * | 2018-06-12 | 2019-12-19 | Jfeスチール株式会社 | 極低温用高張力厚鋼板およびその製造方法 |
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EP3190201A1 (en) * | 2012-12-13 | 2017-07-12 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Thick steel plate having excellent cryogenic toughness |
KR102075206B1 (ko) * | 2017-11-17 | 2020-02-07 | 주식회사 포스코 | 충격인성이 우수한 저온용 강재 및 그 제조방법 |
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH07109544A (ja) * | 1993-10-08 | 1995-04-25 | Nippon Steel Corp | 靱性の良い低降伏比厚鋼板 |
KR20040054198A (ko) * | 2002-12-18 | 2004-06-25 | 주식회사 포스코 | 저온인성이 우수한 고장력 강판의 제조방법 |
KR20120011289A (ko) | 2010-07-28 | 2012-02-07 | 현대제철 주식회사 | 가공성이 용이한 500MPa급 LPG용 고강도 강재 제조방법 및 그 강재 |
KR20150023724A (ko) * | 2012-07-23 | 2015-03-05 | 제이에프이 스틸 가부시키가이샤 | Ni 함유 후강판 |
JP2015086403A (ja) * | 2013-10-28 | 2015-05-07 | Jfeスチール株式会社 | 低温用鋼板およびその製造方法 |
WO2019239761A1 (ja) * | 2018-06-12 | 2019-12-19 | Jfeスチール株式会社 | 極低温用高張力厚鋼板およびその製造方法 |
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US20240002970A1 (en) | 2024-01-04 |
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EP4261312A1 (en) | 2023-10-18 |
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