WO2020085684A1 - 극저온 인성 및 연성이 우수한 압력용기용 강판 및 그 제조 방법 - Google Patents
극저온 인성 및 연성이 우수한 압력용기용 강판 및 그 제조 방법 Download PDFInfo
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- WO2020085684A1 WO2020085684A1 PCT/KR2019/013214 KR2019013214W WO2020085684A1 WO 2020085684 A1 WO2020085684 A1 WO 2020085684A1 KR 2019013214 W KR2019013214 W KR 2019013214W WO 2020085684 A1 WO2020085684 A1 WO 2020085684A1
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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
- 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
- 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
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
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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
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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
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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
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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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/008—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
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel 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
- C22C38/002—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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
- F17C2203/0639—Steels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/21—Shaping processes
- F17C2209/2181—Metal working processes, e.g. deep drawing, stamping or cutting
Definitions
- the present invention relates to a steel plate used in a pressure vessel for low temperature, a vessel, storage tank, structural steel, and the like, and more specifically, a tensile strength 700MPa grade low temperature pressure vessel steel plate excellent in cryogenic toughness and ductility, and a manufacturing method thereof It is about.
- High-strength high-strength thick steel is made of a mixed structure of tempered martensite, retained austenite, and tempered bainite, and these steels must be used as cryogenic structural materials during construction. Toughness and ductility are required.
- the high-strength structural steel for cryogenic properties requires excellent cryogenic toughness and ductility
- the high-strength hot-rolled steel produced through conventional NOMALIZING treatment has a mixed structure of ferrite and pearlite, and is described in Patent Document 1 as an example. The invention is mentioned.
- Patent Document 1 by weight, C: 0.08 ⁇ 0.15%, Si: 0.2 ⁇ 0.3%, Mn: 0.5 ⁇ 1.2%, P: 0.01 ⁇ 0.02%, S: 0.004 ⁇ 0.006%, Ti: exceeds 0% To 0.01% or less, Mo: 0.05 to 0.1%, Ni: 3.0 to 5.0%, and the rest of Fe and other unavoidable impurities, characterized in that 500MPa class LPG high strength steel is proposed, and the steel composition It is characterized by adding Mo.
- Patent Document 1 Republic of Korea Patent Publication No. 2012-0011289
- the present invention is to solve the problems of the prior art, by controlling the cooling and heat treatment process of the steel structure produced by the tempered bainite and tempered martensite mixed structure to secure a tensile strength of 700MPa class
- An object of the present invention is to provide a low pressure pressure vessel steel sheet and a method for manufacturing the same.
- C 0.05 to 0.15%
- Si 0.20 to 0.40%
- Mn 0.3 to 0.6%
- Al 0.001 to 0.05%
- P 0.012% or less
- S 0.015% or less
- Ni 4.0 to 5.0%
- the present invention relates to a low pressure pressure vessel steel sheet having excellent cryogenic toughness and ductility, wherein the steel microstructure is composed of 15 to 80% by area of tempered bainite and the remaining tempered martensite.
- Cryogenic toughness including; a step of tempering the secondary cooled steel material for ⁇ 2.4 ⁇ t + (10 ⁇ 30) ⁇ minutes [where t denotes the thickness (mm) of the steel material] in a section of 600 to 670 ° C; and
- the present invention relates to a method for manufacturing a steel sheet for a pressure vessel for cryogenic properties having excellent ductility and low ductility.
- the steel microstructure obtained by the tempering process may be composed of 15 to 80 area fractions (%) of tempered bainite and the remaining tempered martensite.
- the present invention having the above configuration can effectively provide a low pressure pressure vessel steel sheet excellent in toughness and ductility that can be stably used at a low temperature of about -150 ° C while satisfying a tensile strength of 700 MPa.
- the low pressure toughness and ductility of the present invention is a pressure vessel steel sheet for low temperature, by weight, C: 0.05 ⁇ 0.15%, Si: 0.20 ⁇ 0.40%, Mn: 0.3 ⁇ 0.6%, Al: 0.001 ⁇ 0.05%, P : 0.012% or less, S: 0.015% or less, Ni: 4.0 to 5.0%, In: 0.001 to 0.10%, balance Fe and unavoidable impurities.
- the specific steel composition components and the reasons for limiting the components are as follows, and in the following description of the steel composition components,% means weight%.
- the C content in the steel sheet it is preferable to limit the C content in the steel sheet to a range of 0.05 to 0.15%. This is because if the C content is less than 0.05%, the strength of the matrix phase decreases, and if it exceeds 0.15%, the weldability of the steel sheet is greatly impaired.
- Si is a component added for deoxidation effect, solid solution strengthening effect and impact transition temperature increase effect, and it is preferable to add 0.20% or more in order to achieve this addition effect.
- it is added in excess of 0.40% the weldability is reduced and the oxide film is severely formed on the surface of the steel sheet, so it is preferable to limit the content to 0.20 to 0.40%.
- Mn forms MnS, which is a non-metallic inclusion stretched together with S, thereby reducing elongation at room temperature and low-temperature toughness, so it is preferable to manage it at 0.6% or less.
- Al is one of the strong deoxidizers in the steelmaking process together with Si, and its effect is insignificant when it is less than 0.001% and the manufacturing cost increases when it exceeds 0.05%, so its content is preferably limited to 0.001 to 0.05%.
- P is an element that harms low-temperature toughness or an excessive cost is required to be removed in the steelmaking process, so it is desirable to manage it within a range of 0.012% or less.
- S is an element that adversely affects low-temperature toughness in addition to P, but like P, it may be expensive to remove it in the steelmaking process, so it is preferable to manage within the range of 0.015% or less.
- Ni is the most effective element for improving low-temperature toughness.
- the addition amount is less than 4.0%, it causes a decrease in low-temperature toughness, and if it is added in excess of 5.0%, it leads to an increase in manufacturing cost, so it is preferable to add within the range of 4.0 to 5.0%.
- In is a low melting point metal and is an important element for increasing ductility.
- the addition amount is less than 0.001%, the effect of the addition cannot be expected, and if it exceeds 0.1%, it is preferable to limit it to 0.001 to 0.1% because it may appear as a coarse precipitate during the playing process and impair low-temperature toughness.
- the In is added in the range of 0.05 to 0.08%.
- the steel sheet of the present invention is made of 25 to 80% by area of the steel microstructure of tempered bainite and the remaining tempered martensite. If the fraction of tempered bainite is less than 15%, the amount of tempered martensite becomes excessive, and the low-temperature toughness of the steel sheet may deteriorate. On the other hand, if it exceeds 80%, it may be difficult to secure the strength of the target steel sheet.
- the steel sheet having the above-mentioned emphasizing component and microstructure can effectively maintain the tensile strength of 700 MPa, as well as have excellent ductility and low-temperature toughness.
- the steel material for pressure vessels according to the present invention can be manufactured through a process of [reheating-hot rolling and cooling-heat treatment and cooling-tempering] for steel slabs satisfying the alloy composition proposed in the present invention. It will be described in detail.
- the present invention it is preferable to reheat the steel slabs satisfying the above-described alloy composition to a temperature range of 1050 to 1250 ° C. At this time, if the reheating temperature is less than 1050 ° C, solute atom is difficult to employ, whereas when it exceeds 1250 ° C, the austenite grain size becomes too coarse and impairs the properties of steel, which is not preferable.
- the reheated steel slab is hot rolled to produce a hot rolled steel sheet.
- the hot rolling is preferably performed at a rolling reduction rate of 5 to 30% per pass.
- the reduction ratio per pass during the hot rolling is less than 5%, there is a problem in that manufacturing cost increases due to a decrease in rolling productivity. On the other hand, if it exceeds 30%, it is not preferable because a load is generated in the rolling mill, which can have a fatal adverse effect on the equipment. It is preferable to finish rolling at a temperature of 800 ° C or higher at the end of rolling. It is not preferable to roll to a temperature of less than 800 ° C because it causes a load on the rolling mill.
- the heat treatment is preferably maintained for ⁇ (2.4 ⁇ t) + (10 ⁇ 30) ⁇ minutes (where t denotes the thickness of the steel sheet (unit: mm)) in a temperature range of 690 to 760 ° C. .
- the secondary cooled hot-rolled steel sheet is tempered for ⁇ 2.4 ⁇ t + (10 to 30) ⁇ minutes in the section of 600 to 670 ° C, where t is the thickness of the steel (mm). do.
- t is the thickness of the steel (mm).
- the steel microstructure obtained by the tempering process may consist of 15 to 80 area fractions (%) of tempered bainite and the remaining tempered martensite.
- each steel slabs having the compositional components shown in Table 1 were reheated at a temperature range of 1050 to 1250 ° C. And each of these reheated steel sheets was hot rolled at a rolling reduction rate of 5 to 30% per pass, and the end temperature of hot rolling was controlled as shown in Table 2. Then, each hot-rolled steel sheet was first cooled under the conditions of Table 2 within 30 seconds after the hot rolling, and then heat-treated under the conditions of Table 2. Subsequently, the heat-treated hot-rolled steel sheet was secondary cooled to room temperature, and then tempered on the secondary cooled steel sheet under the conditions shown in Table 2.
- the yield strength, tensile strength, and low-temperature toughness of the prepared steel sheets were evaluated, and the results are also shown in Table 2 below.
- the low-temperature toughness is a result of evaluating the Charpy impact energy value obtained by performing a Charpy impact test on a specimen having a V notch at -150 ° C.
- the tensile test for measuring the tensile strength and yield strength was performed in accordance with ASTM A20, A370 and E8.
- a * is the hot rolling end temperature (°C)
- B * is the primary cooling (water cooling) rate (°C / s)
- C * is the heat treatment temperature (°C)
- D * is the heat treatment time (min)
- E * Indicates tempering temperature (° C)
- F * indicates tempering time (hr)
- G * indicates tempered bainite fraction (%)
- H * indicates -150 ° C impact toughness (J).
- the tempered bainite and the remainder of 15-80% as an area fraction after tempering treatment Tempered martensitic structure can be obtained, yield strength and tensile strength of about 100MPa and 80MPa, respectively, are superior to those of Comparative Materials 1-6, while elongation is at least 10% and -150 °C low temperature toughness is also excellent at over 100J. .
- the manufacturing process conditions are out of the scope of the present invention, and the comparative example 1-2 and the steel production process condition are within the scope of the present invention or the steel composition component is within the scope of the present invention. It can be seen from Comparative Example 2-4 that it is difficult to secure desirable microstructure and secure desired properties.
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Abstract
Description
강종 | 조성성분(중량%) | |||||||
C | Mn | Si | Al | P | S | Ni | In | |
발명강a | 0.10 | 0.52 | 0.29 | 0.032 | 0.009 | 0.0012 | 4.49 | 0.08 |
발명강b | 0.09 | 0.55 | 0.27 | 0.029 | 0.008 | 0.0010 | 4.45 | 0.05 |
발명강c | 0.10 | 0.50 | 0.28 | 0.033 | 0.010 | 0.0011 | 4.85 | 0.07 |
비교강d | 0.11 | 0.50 | 0.29 | 0.030 | 0.012 | 0.0012 | 4.20 | - |
Claims (5)
- 중량%로, C: 0.05 ~ 0.15%, Si: 0.20 ~ 0.40%, Mn: 0.3 ~ 0.6%, Al:0.001~0.05%, P: 0.012% 이하, S: 0.015%이하, Ni: 4.0 ~ 5.0%, In: 0.001~0.10%, 잔부 Fe 및 불가피한 불순물을 포함하고,강 미세조직이 15~80 면적%의 템퍼드 베이나이트와 잔부 템퍼드 마르텐사이트로 이루어진 극저온 인성 및 연성이 우수한 저온용 압력용기 강판.
- 제 1항에 있어서, 상기 In을 0.05~0.08% 범위로 함유하는 것을 특징으로 하는 극저온 인성 및 연성이 우수한 저온용 압력용기 강판.
- 중량%로, C: 0.05 ~ 0.15%, Si: 0.20 ~ 0.40%, Mn: 0.3 ~ 0.6%, Al:0.001~0.05%, P: 0.012% 이하, S: 0.015%이하, Ni: 4.0 ~ 5.0%, In: 0.001~0.10%, 잔부 Fe 및 불가피한 불순물을 포함하는 강 슬라브를 1050 ~ 1250℃에서 재가열하는 공정;상기 재가열된 강판을 패스당 5 ~ 30%의 압하율로 열간 압연하고, 800℃ 이상의 온도에서 압연을 종료하는 열간압연 공정;상기 열간 압연된 강판을 열간압연 후 30초 이내 2.5~50℃/sec의 냉각 속도로 1차 냉각하는 공정;상기 냉각된 강재를 690 ~ 760℃에서 {2.4×t + (10~30)}분 [여기서 t는 강재의 두께(mm)를 의미한다] 동안 중간 열처리 후, 2.5~50℃/sec의 냉각 속도로 2차 냉각하는 공정; 및상기 2차 냉각된 강재를 600~670℃구간에서 {2.4×t + (10~30)}분 [여기서 t는 강재의 두께(mm)를 의미한다] 동안 템퍼링하는 공정;을 포함하는 극저온 인성 및 연성이 우수한 저온용 압력용기용 강판 제조 방법.
- 제 3항에 있어서, 상기 템퍼링 공정으로 얻어진 강 미세조직은 15~80 면적분율(%)의 템퍼드 베이나이트와 잔부 템퍼드 마르텐사이트로 이루어지는 것을 특징으로 하는 극저온 인성 및 연성이 우수한 저온용 압력용기용 강판 제조 방법.
- 제 3항에 있어서, 상기 In을 0.05~0.08% 범위로 함유하는 것을 특징으로 하는 극저온 인성 및 연성이 우수한 저온용 압력용기 강판 제조방법.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US17/286,409 US20210388457A1 (en) | 2018-10-26 | 2019-10-08 | Steel plate for pressure vessel with excellent cryogenic toughness and excellent ductility and manufacturing method thereof |
JP2021522542A JP7183410B2 (ja) | 2018-10-26 | 2019-10-08 | 極低温靭性及び延性に優れた圧力容器用鋼板及びその製造方法 |
CN201980069723.8A CN112912527B (zh) | 2018-10-26 | 2019-10-08 | 具有优异的低温韧性和优异的延展性的压力容器用钢板及其制造方法 |
EP19875257.8A EP3872208A4 (en) | 2018-10-26 | 2019-10-08 | STEEL PLATE FOR PRESSURE VESSELS WITH EXCELLENT LOW-TEMPERATURE TOUGHNESS AND EXTENSION RESISTANCE, AND THE PROCESS FOR THEIR MANUFACTURING |
CA3116995A CA3116995C (en) | 2018-10-26 | 2019-10-08 | Steel plate for pressure vessel with excellent cryogenic toughness and excellent ductility, and manufacturing method thereof |
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CN115404398A (zh) * | 2021-05-26 | 2022-11-29 | 拓普特(常州)机械有限公司 | 一种新型钢架的制备方法 |
CN115341152A (zh) * | 2022-08-31 | 2022-11-15 | 鞍钢股份有限公司 | 一种节镍型-100℃低温钢及其制造方法 |
CN116145033B (zh) * | 2022-12-30 | 2024-02-02 | 北京科技大学 | 一种超高韧性低温压力容器钢板及制备方法 |
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- 2019-10-08 JP JP2021522542A patent/JP7183410B2/ja active Active
- 2019-10-08 WO PCT/KR2019/013214 patent/WO2020085684A1/ko unknown
- 2019-10-08 CN CN201980069723.8A patent/CN112912527B/zh active Active
- 2019-10-08 EP EP19875257.8A patent/EP3872208A4/en active Pending
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JP7183410B2 (ja) | 2022-12-05 |
CA3116995C (en) | 2022-12-13 |
EP3872208A4 (en) | 2021-12-08 |
CA3116995A1 (en) | 2020-04-30 |
CN112912527B (zh) | 2022-07-29 |
EP3872208A1 (en) | 2021-09-01 |
KR102065276B1 (ko) | 2020-02-17 |
CN112912527A (zh) | 2021-06-04 |
US20210388457A1 (en) | 2021-12-16 |
JP2022505860A (ja) | 2022-01-14 |
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