EP3395984B1 - Stahlblech mit ausgezeichneter pwht-beständigkeit für niedertemperaturdruckbehälter und verfahren zur herstellung - Google Patents

Stahlblech mit ausgezeichneter pwht-beständigkeit für niedertemperaturdruckbehälter und verfahren zur herstellung Download PDF

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Publication number
EP3395984B1
EP3395984B1 EP16879157.2A EP16879157A EP3395984B1 EP 3395984 B1 EP3395984 B1 EP 3395984B1 EP 16879157 A EP16879157 A EP 16879157A EP 3395984 B1 EP3395984 B1 EP 3395984B1
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EP
European Patent Office
Prior art keywords
steel
steel plate
tempered
pwht
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16879157.2A
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English (en)
French (fr)
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EP3395984A1 (de
EP3395984A4 (de
Inventor
Soon-Taik Hong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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Publication date
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Publication of EP3395984A1 publication Critical patent/EP3395984A1/de
Publication of EP3395984A4 publication Critical patent/EP3395984A4/de
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Classifications

    • 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
    • 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")
    • 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
    • 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
    • C21D8/0221—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
    • 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
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • C21D2211/008—Martensite

Definitions

  • the steel plate of the present disclosure includes, in terms of wt%, 0.07-0.17% of C, 0.15-0.40% of Si, 0.3-0.7% of Mn, 0.012% or less of P, 0.015% or less of S, 3.0-4.0% of Ni, 0.03-0.25% of W, and a balance of Fe and inevitable impurities, and specific steel composition components and reasons for limiting the components are as follows.
  • Ni is the most effective element for improving low-temperature toughness. However, when an added content of Ni is less than 3.0%, low-temperature toughness may be deteriorated. When the added content is more than 4.0%, production cost may be increased. Therefore, Ni is added within a range of 3.0 to 4.0%.
  • the steel slab having the steel composition component is reheated at 1050-1250°C.
  • a reheating temperature is less than 1050°C, a solute atom may be difficult to be solid-solutionized, and when the reheating temperature is more than 1250°C, an austenite crystal grain size may be excessively coarse to lower physical properties of the steel plate.
  • a heating temperature is less than 800°C, an alloy component may be difficult to be sufficiently solid-solutionized, and when the heating temperature is more than 950°C, crystal grains may be coarsened, such that the toughness may be deteriorated.
  • a PWHT temperature is less than 580°C, it may be difficult to remove residual stress from the welded portion, or the like, and when the PWHT temperature is more than 640°C, strength of the steel material may be significantly lowered. Further, when the PWHT time is more than 20 hours, strength may be excessively deteriorated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (8)

  1. Stahlplatte mit ausgezeichneter PWHT-Beständigkeit für einen Niedertemperaturdruckbehälter, umfassend:
    in Gew.-%, 0,07-0,17 % C, 0,15-0,40 % Si, 0,3-0,7 % Mn, höchstens 0,012 % P, höchstens 0,015 % S, 3,0-4,0 % Ni, 0,03-0,25 % W und einen Rest Fe sowie unvermeidbare Verunreinigungen, wobei die Stahlplatte eine Stahlmikrostruktur aufweist, die 25-80 Flächen-% getempertes Bainit und einen Rest getempertes Martensit beinhaltet, und wobei die Stahlplatte eine Zugfestigkeit von 600 MPa oder mehr beibehält, selbst wenn die Stahlplatte maximal 20 Stunden lang bei 580-640 °C einer PWHT ausgesetzt wird.
  2. Stahlplatte nach Anspruch 1, wobei die Stahlmikrostruktur 30-70 Flächen-% getempertes Bainit und einen Rest getempertes Martensit beinhaltet.
  3. Stahlplatte nach Anspruch 1, wobei die Stahlplatte mit einem Charpy-Kerbschlagenergiewert 200 J oder mehr bei -110 °C aufweist, selbst wenn die Stahlplatte höchstens 20 Stunden lang bei 580-640 °C einer PWHT ausgesetzt wird.
  4. Verfahren zum Herstellen einer Stahlplatte mit ausgezeichneter PWHT-Beständigkeit für einen Niedertemperaturdruckbehälter, wobei das Verfahren umfasst:
    Wiedererhitzen einer Stahlbramme bei einer Temperatur von 1050-1250 °C, wobei die Stahlbramme in Gew.-% 0,07-0,17 % C, 0,15-0,40 % Si, 0,3-0,7 % Mn, höchstens 0,012 % P, höchstens 0,015 % S, 3,0-4,0 % Ni, 0,03-0,25 % W und einen Rest Fe sowie unvermeidliche Verunreinigungen beinhaltet;
    Warmwalzen der wiedererhitzten Stahlbramme und Beenden des Walzens bei einer Temperatur von 800 °C oder mehr, um ein warmgewalztes Stahlblech zu erhalten;
    Erhitzen der warmgewalzten Stahlplatte auf 800-950 °C, gefolgt von Wasserkühlung; und
    Tempern des wassergekühlten Stahlmaterials bei 550-660 °C für (1,5 × t + (10) Minuten bis (1,5 × t + 30) Minuten [wobei t eine Dicke (mm) des Stahlmaterials ist] und wobei eine Abkühlgeschwindigkeit der Wasserkühlung 2,5 bis 30 °C/s beträgt.
  5. Verfahren nach Anspruch 4, ferner umfassend:
    einen PWHT-Vorgang für maximal 20 Stunden bei 580-640 °C nach dem Tempern.
  6. Verfahren nach Anspruch 4, wobei eine Mikrostruktur des getemperten Stahls 25-80 Flächen-% getempertes Bainit und einen Rest getempertes Martensit aufweist.
  7. Verfahren nach Anspruch 4, wobei eine Mikrostruktur des getemperten Stahls 30-70 Flächen-% getempertes Bainit und einen Rest getempertes Martensit aufweist.
  8. Verfahren nach Anspruch 4, wobei eine Reduktionsrate pro Durchgang in dem Warmwalzen 5-30 % beträgt.
EP16879157.2A 2015-12-22 2016-11-03 Stahlblech mit ausgezeichneter pwht-beständigkeit für niedertemperaturdruckbehälter und verfahren zur herstellung Active EP3395984B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150183528A KR101758497B1 (ko) 2015-12-22 2015-12-22 Pwht 저항성이 우수한 저온 압력용기용 강판 및 그 제조 방법
PCT/KR2016/012566 WO2017111290A1 (ko) 2015-12-22 2016-11-03 Pwht 저항성이 우수한 저온 압력용기용 강판 및 그 제조 방법

Publications (3)

Publication Number Publication Date
EP3395984A1 EP3395984A1 (de) 2018-10-31
EP3395984A4 EP3395984A4 (de) 2018-12-26
EP3395984B1 true EP3395984B1 (de) 2020-01-29

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EP16879157.2A Active EP3395984B1 (de) 2015-12-22 2016-11-03 Stahlblech mit ausgezeichneter pwht-beständigkeit für niedertemperaturdruckbehälter und verfahren zur herstellung

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Country Link
US (1) US20180371568A1 (de)
EP (1) EP3395984B1 (de)
JP (1) JP6700400B2 (de)
KR (1) KR101758497B1 (de)
CN (1) CN108431272B (de)
WO (1) WO2017111290A1 (de)

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KR102031499B1 (ko) 2018-08-07 2019-10-11 주식회사 포스코 표면품질 및 충격인성이 우수한 압력용기용 강재 및 이의 제조방법
KR102065276B1 (ko) * 2018-10-26 2020-02-17 주식회사 포스코 극저온 인성 및 연성이 우수한 압력용기용 강판 및 그 제조 방법
KR102200225B1 (ko) * 2019-09-03 2021-01-07 주식회사 포스코 극저온 횡팽창이 우수한 압력용기용 강판 및 그 제조 방법
KR102280641B1 (ko) * 2019-10-22 2021-07-22 주식회사 포스코 고온 용접후열처리 저항성이 우수한 압력용기용 강판 및 그 제조방법
CN112626417A (zh) * 2020-12-14 2021-04-09 南阳汉冶特钢有限公司 一种低成本690MPa级低温抗震钢的生产方法
CN113088807A (zh) * 2021-02-25 2021-07-09 舞阳钢铁有限责任公司 一种高韧性低温压力容器用钢板及其生产方法
CN113549815B (zh) * 2021-06-25 2022-09-16 鞍钢股份有限公司 一种低温用低合金压力容器用钢板及生产方法
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Also Published As

Publication number Publication date
EP3395984A1 (de) 2018-10-31
WO2017111290A8 (ko) 2017-12-21
KR20170075050A (ko) 2017-07-03
CN108431272B (zh) 2020-07-28
KR101758497B1 (ko) 2017-07-27
WO2017111290A1 (ko) 2017-06-29
EP3395984A4 (de) 2018-12-26
US20180371568A1 (en) 2018-12-27
JP6700400B2 (ja) 2020-05-27
CN108431272A (zh) 2018-08-21
JP2019505672A (ja) 2019-02-28

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