EP4606922A1 - Stahl mit niedriger wärmeausdehnung und verbesserter tieftemperaturschlagzähigkeit und herstellungsverfahren dafür - Google Patents

Stahl mit niedriger wärmeausdehnung und verbesserter tieftemperaturschlagzähigkeit und herstellungsverfahren dafür

Info

Publication number
EP4606922A1
EP4606922A1 EP23903673.4A EP23903673A EP4606922A1 EP 4606922 A1 EP4606922 A1 EP 4606922A1 EP 23903673 A EP23903673 A EP 23903673A EP 4606922 A1 EP4606922 A1 EP 4606922A1
Authority
EP
European Patent Office
Prior art keywords
less
thermal expansion
formula
low
impact toughness
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.)
Pending
Application number
EP23903673.4A
Other languages
English (en)
French (fr)
Other versions
EP4606922A4 (de
Inventor
Kyunghun Kim
Hak Kim
Jisoo Kim
Jongjin JEON
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP4606922A1 publication Critical patent/EP4606922A1/de
Publication of EP4606922A4 publication Critical patent/EP4606922A4/de
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • C21D6/004—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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys 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 of ferrous metals or ferrous alloys 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • 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
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni

Definitions

  • the present disclosure relates to a low thermal expansion steel having improved low-temperature impact toughness and a method for manufacturing the same.
  • cracks in the material may be caused by stress due to thermal expansion of the material as the temperature changes, or by the decrease in impact toughness of the material in the extremely low temperature environment.
  • Patent Document 1 Korean Patent Publication 10-1995-0032674 A (Dec. 22, 1995 )
  • the present disclosure provides a low thermal expansion steel having a low thermal expansion coefficient value and excellent low-temperature impact toughness by optimizing steel components and controlling a manufacturing method, and a method for manufacturing the same.
  • Cr, Ni, and Co represent the content (wt%) of the respective elements.
  • Cr, Ni, Mn, and Co represent the content (wt%) of the respective elements.
  • a low thermal expansion steel having improved low-temperature impact toughness may include, in percent by weight (wt%), more than 0% and 0.04% or less of C, 0.1% or more and 0.5% or less of Si, 0.1% or more and 0.4% or less of Mn, 0.003% or less of P, 0.003% or less of S, more than 0% and 0.5% or less of Cr, 34% or more and 38% or less of Ni, more than 0% and 2.0% or less of Co, the remainder of Fe and inevitable impurities.
  • the content of C may be more than 0% and 0.04% or less.
  • C is an element effective for increasing strength, and thus it is preferable to add an appropriate amount for utilization as a thin sheet material.
  • C may deteriorate thermal expansion by formation of carbides, it is advantageous to manage the content of C low. Meanwhile, managing the C content excessively low may cause an increase in process costs. Accordingly, the content of C may be controlled to more than 0% and 0.04% or less to secure price competitiveness while maintaining low thermal expansion properties. Preferably, the content of C may be 0.003% or more and 0.037% or less.
  • the content of Si may be 0.1% or more and 0.5% or less.
  • Si is an element effective for reducing O content and controlling inclusions by facilitating deoxidation during alloy refining.
  • the Si content has been controlled to 0.1% or less.
  • the content of Si may be controlled to 0.1% or more and 0.5% or less so that deoxidation is easy while suppressing thermal expansion.
  • the content of Si may be 0.11% or more and 0.42% or less.
  • the content of Mn may be 0.1% or more and 0.4% or less.
  • the content of P may be 0.003% or less or more than 0% and 0.003% or less.
  • the content of S may be 0.003% or less or more than 0% and 0.003% or less.
  • S is an impurity inevitably contained in steel, and is segregated in grain boundaries and impairs hot workability. In particular, because S may cause shape defects during welding or generate cracks, it is advantageous to manage the content low.
  • an upper limit of the S content may be limited to 0.003% or less.
  • the S content may be 0.0004% or more and 0.0022% or less.
  • the content of Cr may be more than 0% and 0.5% or less.
  • Ni is an essential element for securing low thermal expansion properties by reducing thermal expansion.
  • elements other than Ni and Fe are managed at extremely low contents, leading to an increase in process costs.
  • the Ni content is controlled to 34 to 38%, and Cr and Co components are adjusted to lower the thermal expansion coefficient.
  • the content of Ni may be controlled to 34.6% or more and 37.1% or less.
  • the content of Co may be more than 0% and 2.0% or less.
  • the remaining component of the disclosure is iron (Fe).
  • Fe iron
  • unintended impurities may inevitably be introduced from raw materials or the surrounding environment during a typical manufacturing process, this may not be excluded. Since such impurities may be well known to those skilled in the art during a typical manufacturing process, details thereof are not described in this specification.
  • the low thermal expansion steel having improved low-temperature impact toughness may have a value of Formula (1) below of 112 or less.
  • Cr, Ni, and Co represent the content (wt%) of the respective elements.
  • Formula (1) is derived by combining alloying components that may affect the thermal expansion coefficient.
  • the thermal expansion coefficient from room temperature to 100°C may exceed 1.0 x 10-6/°C. That is, in the case where the value of Formula (1) exceeds 112, an ability to suppress thermal expansion may be inferior.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
EP23903673.4A 2022-12-14 2023-09-04 Stahl mit niedriger wärmeausdehnung und verbesserter tieftemperaturschlagzähigkeit und herstellungsverfahren dafür Pending EP4606922A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020220174828A KR20240091663A (ko) 2022-12-14 2022-12-14 저온 충격인성이 향상된 저열팽창강 및 그 제조방법
PCT/KR2023/013122 WO2024128469A1 (ko) 2022-12-14 2023-09-04 저온 충격인성이 향상된 저열팽창강 및 그 제조방법

Publications (2)

Publication Number Publication Date
EP4606922A1 true EP4606922A1 (de) 2025-08-27
EP4606922A4 EP4606922A4 (de) 2026-04-22

Family

ID=91485092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23903673.4A Pending EP4606922A4 (de) 2022-12-14 2023-09-04 Stahl mit niedriger wärmeausdehnung und verbesserter tieftemperaturschlagzähigkeit und herstellungsverfahren dafür

Country Status (5)

Country Link
EP (1) EP4606922A4 (de)
JP (1) JP2025541555A (de)
KR (1) KR20240091663A (de)
CN (1) CN120569509A (de)
WO (1) WO2024128469A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119101851B (zh) * 2024-08-14 2026-01-23 山西太钢不锈钢股份有限公司 一种低膨胀精密合金厚板及其制造方法
KR20260038011A (ko) * 2024-09-11 2026-03-18 주식회사 포스코 저열팽창강 및 그 제조방법

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970001325B1 (ko) 1994-05-17 1997-02-05 김만제 고온 내산화성 및 열간가공성이 우수한 인바합금 및 그 제조방법
JP3406722B2 (ja) * 1995-01-13 2003-05-12 日新製鋼株式会社 シャドウマスク用低熱膨張合金
FR2849061B1 (fr) * 2002-12-20 2005-06-03 Imphy Ugine Precision Alliage fer-nickel a tres faible coefficient de dilatation thermique pour la fabrication de masques d'ombres
JP2004323949A (ja) * 2003-04-28 2004-11-18 Nikko Metal Manufacturing Co Ltd プレス成形型シャドウマスク用Ｆｅ−Ｎｉ系合金薄帯
DE102006062782B4 (de) * 2006-12-02 2010-07-22 Thyssenkrupp Vdm Gmbh Eisen-Nickel-Legierung mit hoher Duktilität und geringem Ausdehnungskoeffizienten
BR112016020449B8 (pt) * 2014-03-14 2019-10-22 Aperam liga à base de ferro, método para fabricar uma tira em uma liga, tira, método para fabricar um fio de soldagem, fio de soldagem e uso da liga
CN110541119B (zh) * 2018-05-28 2021-07-09 宝武特种冶金有限公司 一种低膨胀铁镍合金及其制造方法
JP7320987B2 (ja) * 2019-05-23 2023-08-04 日鉄ステンレス株式会社 インバー合金板およびその製造方法
WO2021132634A1 (ja) * 2019-12-27 2021-07-01 日本製鉄株式会社 合金
WO2021221003A1 (ja) * 2020-04-28 2021-11-04 日鉄ステンレス株式会社 合金材およびその製造方法
JP7610244B2 (ja) * 2020-12-16 2025-01-08 新報国マテリアル株式会社 低熱膨張合金

Also Published As

Publication number Publication date
CN120569509A (zh) 2025-08-29
JP2025541555A (ja) 2025-12-19
EP4606922A4 (de) 2026-04-22
WO2024128469A1 (ko) 2024-06-20
KR20240091663A (ko) 2024-06-21

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