EP3556892A1 - Tôle d'acier faiblement allié ayant une résistance et une ductilité excellentes - Google Patents

Tôle d'acier faiblement allié ayant une résistance et une ductilité excellentes Download PDF

Info

Publication number
EP3556892A1
EP3556892A1 EP17881659.1A EP17881659A EP3556892A1 EP 3556892 A1 EP3556892 A1 EP 3556892A1 EP 17881659 A EP17881659 A EP 17881659A EP 3556892 A1 EP3556892 A1 EP 3556892A1
Authority
EP
European Patent Office
Prior art keywords
steel sheet
low alloy
alloy steel
phase
steel
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.)
Withdrawn
Application number
EP17881659.1A
Other languages
German (de)
English (en)
Other versions
EP3556892A4 (fr
Inventor
Jeom Yong Choi
Mi Nam Park
Min Hyoung Lee
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 EP3556892A4 publication Critical patent/EP3556892A4/fr
Publication of EP3556892A1 publication Critical patent/EP3556892A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • C22C38/06—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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • 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
    • 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
    • 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

Definitions

  • a low alloy steel sheet excellent in strength and ductility comprises, , in percent (%) by weight of the entire composition, 0.05 to 0.3 % of carbon (C), 0.7 to 2.5 % of silicon (Si), 8 to 12 % of manganese (Mn), 13 to 15.5 % of chromium (Cr), 0.5 to 3.0 % of copper (Cu), 0.1 to 0.2 % of nitrogen (N), 0.25 % or less of aluminum (Al), 0.25 % or less of tin (Sn), and the remainder of iron (Fe) and other inevitable impurities, wherein the microstructure of the low alloy steel sheet comprises at least one of a ferrite phase and a martensite phase at a volume fraction of 5% or less, and the remainder includes an austenite phase.
  • the low alloy steel sheet may further comprise 0.2% or less of nickel (Ni).
  • the low alloy steel sheet excellent in strength and ductility according to the embodiments of the present invention has a tensile strength of 650 MPa or more and an elongation of 40% or more by realizing a TRIP or TWIP phenomenon, and can be used for automobile parts or other structural materials .
  • % refers to% by weight.
  • Chromium is a representative ferrite-forming element and is an element that increases corrosion resistance. In particular, it is an element that greatly affects nitrogen solubility.
  • the trace elements particularly S and P which are intergranular segregated elements.
  • the amount of ferrite exceeds a certain amount, it is present in two phases of ferrite and austenite at a high temperature, resulting in deterioration of hot workability and a large amount of cracks are generated in hot rolling.
  • some of the ferrite phases are present more than necessary in the manufacture of the final product, resulting in deterioration of mechanical properties.
  • Nitrogen is a representative austenite forming element together with Ni and it is an element which improves the corrosion resistance of the material together with Cr and Mo.
  • the minimum N content of which the effect of the addition of N is shown and improves the strength of the material with interstitial elements together with C is 0.1 %.
  • pressure is applied to increase the solubility of N in order to dissolve a large amount of N in the material.
  • Cr and Mn which are representative elements for increasing the solubility of N, are present in a large amount, the amount that can maximally dissolve N without applying atmospheric pressure is 0.2%. Therefore, it is preferable that the appropriate amount of N is limited within the range of 0.1 to 0.2%.
  • Specimens of steels corresponding to the composition range of the composition according to the present invention were prepared, and the phase fraction, elongation, and tensile strength of the material were measured after hot rolling and hot rolled annealing.
  • Table 1 below shows the alloy composition (wt%) for the experimental steel types.
  • FIG. 5 is a photograph showing the microstructure of the inventive steel 2, in which an austenite phase and a residual martensite phase were observed.
  • FIGS. 5 to 10 are representative microstructure photographs corresponding to Table 2. It can be confirmed that the measurement results in Table 2 and the observation results in FIGS. 5 to 10 are actually in agreement.
  • FIG. 15 is a graph showing tensile test results of inventive steels and comparative steels according to an embodiment of the present invention.
  • the elongation percentage was more than 40% and the tensile strength was 650 MPa or more.
  • the values of the stress-strain curve and the tensile strength largely vary according to the deformation behavior of the main phase, austenite phase.
  • the elongation can be secured not less than 40%, and the tensile strength is 1,200 MPa, which indicates that high strength can be secured.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP17881659.1A 2016-12-13 2017-05-24 Tôle d'acier faiblement allié ayant une résistance et une ductilité excellentes Withdrawn EP3556892A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020160169693A KR101903174B1 (ko) 2016-12-13 2016-12-13 강도 및 연성이 우수한 저합금 강판
PCT/KR2017/005381 WO2018110779A1 (fr) 2016-12-13 2017-05-24 Tôle d'acier faiblement allié ayant une résistance et une ductilité excellentes

Publications (2)

Publication Number Publication Date
EP3556892A4 EP3556892A4 (fr) 2019-10-23
EP3556892A1 true EP3556892A1 (fr) 2019-10-23

Family

ID=62559145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17881659.1A Withdrawn EP3556892A1 (fr) 2016-12-13 2017-05-24 Tôle d'acier faiblement allié ayant une résistance et une ductilité excellentes

Country Status (6)

Country Link
US (1) US20200080178A1 (fr)
EP (1) EP3556892A1 (fr)
JP (1) JP2020509175A (fr)
KR (1) KR101903174B1 (fr)
CN (1) CN110062814A (fr)
WO (1) WO2018110779A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4036268A4 (fr) * 2019-10-29 2022-08-24 Posco Acier inoxydable austénitique ayant un rapport limite d'élasticité plus élevé et procédé pour sa fabrication

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101952818B1 (ko) * 2017-09-25 2019-02-28 주식회사포스코 강도 및 연성이 우수한 저합금 강판 및 이의 제조방법
CN110396691B (zh) * 2019-08-27 2021-08-24 贵州大学 一种6061铝合金表面处理方法
KR102326684B1 (ko) * 2019-09-17 2021-11-17 주식회사 포스코 크리프 강도와 고온 연성이 우수한 크롬강판 및 그 제조방법
KR102385472B1 (ko) 2020-04-22 2022-04-13 주식회사 포스코 고강도, 고성형의 저원가 오스테나이트계 스테인리스강 및 그 제조방법

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS505968B1 (fr) * 1970-04-30 1975-03-10
JPH0686645B2 (ja) * 1989-05-31 1994-11-02 日本金属工業株式会社 熱間加工性に優れたニッケル節減型オーステナイト系ステンレス鋼
FR2766843B1 (fr) * 1997-07-29 1999-09-03 Usinor Acier inoxydable austenitique comportant une tres faible teneur en nickel
DE102005024029B3 (de) 2005-05-23 2007-01-04 Technische Universität Bergakademie Freiberg Austenitischer Leichtbaustahl und seine Verwendung
DE102005030413C5 (de) 2005-06-28 2009-12-10 Technische Universität Bergakademie Freiberg Hochfester austenitisch-martensitischer Leichtbaustahl und seine Verwendung
US7682471B2 (en) * 2006-07-10 2010-03-23 Trw Automotive U.S. Llc Austenitic iron-based alloy
JP5544633B2 (ja) * 2007-07-30 2014-07-09 新日鐵住金ステンレス株式会社 衝撃吸収特性に優れた構造部材用オーステナイト系ステンレス鋼板
JP4976985B2 (ja) * 2007-11-14 2012-07-18 株式会社神戸製鋼所 低温ねじれ特性に優れた線材・棒鋼の製造方法
JP5597006B2 (ja) * 2010-03-26 2014-10-01 新日鐵住金ステンレス株式会社 構造部材用高強度および高延性オーステナイト系ステンレス鋼板およびその製造方法
JP2011219809A (ja) * 2010-04-08 2011-11-04 Honda Motor Co Ltd 高強度鋼板
JP6056132B2 (ja) * 2010-11-25 2017-01-11 Ｊｆｅスチール株式会社 燃料タンク用オーステナイト・フェライト系二相ステンレス鋼
IT1403129B1 (it) 2010-12-07 2013-10-04 Ct Sviluppo Materiali Spa Procedimento per la produzione di acciaio ad alto manganese con resistenza meccanica e formabilità elevate, ed acciaio così ottenibile.
KR20120063793A (ko) * 2010-12-08 2012-06-18 주식회사 포스코 가공성이 우수한 페라이트계 스테인레스강
JP5440672B2 (ja) * 2011-09-16 2014-03-12 Ｊｆｅスチール株式会社 加工性に優れた高強度鋼板およびその製造方法
CN104379773B (zh) * 2012-01-20 2017-09-12 索罗不锈有限责任公司 奥氏体不锈钢产品及其制造方法
JP5869922B2 (ja) * 2012-03-09 2016-02-24 新日鐵住金ステンレス株式会社 面内異方性が小さいフェライト・オーステナイト２相ステンレス鋼板およびその製造方法
ITRM20120647A1 (it) * 2012-12-19 2014-06-20 Ct Sviluppo Materiali Spa ACCIAIO INOSSIDABILE AUSTENITICO AD ELEVATA PLASTICITÀ INDOTTA DA GEMINAZIONE, PROCEDIMENTO PER LA SUA PRODUZIONE, E SUO USO NELLÂeuro¿INDUSTRIA MECCANICA.
CN103205655A (zh) * 2013-03-21 2013-07-17 宝钢不锈钢有限公司 一种含Sn奥氏体不锈钢及其制造方法
CN103966528A (zh) * 2014-04-29 2014-08-06 宝钢不锈钢有限公司 一种含Sn奥氏体不锈钢及其制造方法
FI127274B (en) * 2014-08-21 2018-02-28 Outokumpu Oy HIGH-STRENGTH AUSTENITE STAINLESS STEEL AND ITS PRODUCTION METHOD
KR101668533B1 (ko) * 2014-12-26 2016-10-24 주식회사 포스코 표면 품질이 우수한 듀플렉스 스테인리스강

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4036268A4 (fr) * 2019-10-29 2022-08-24 Posco Acier inoxydable austénitique ayant un rapport limite d'élasticité plus élevé et procédé pour sa fabrication
JP2023500839A (ja) * 2019-10-29 2023-01-11 ポスコ 降伏比が向上したオーステナイト系ステンレス鋼及びその製造方法

Also Published As

Publication number Publication date
EP3556892A4 (fr) 2019-10-23
WO2018110779A1 (fr) 2018-06-21
KR20180068088A (ko) 2018-06-21
CN110062814A (zh) 2019-07-26
JP2020509175A (ja) 2020-03-26
KR101903174B1 (ko) 2018-10-01
US20200080178A1 (en) 2020-03-12

Similar Documents

Publication Publication Date Title
JP6779320B2 (ja) 強度及び成形性に優れたクラッド鋼板及びその製造方法
EP3556892A1 (fr) Tôle d'acier faiblement allié ayant une résistance et une ductilité excellentes
AU2014294080B2 (en) High-strength steel material for oil well and oil well pipes
JP5349015B2 (ja) Ｎｉ節約型オーステナイト系ステンレス熱延鋼板の製造方法並びにスラブおよび熱延鋼板
EP3561124A1 (fr) Matériau en acier pour récipients sous pression présentant une excellente résistance à la fissuration par l'hydrogène et son procédé de fabrication
JP5569657B2 (ja) 耐時効性に優れた鋼板およびその製造方法
JP2010059452A (ja) 冷延鋼板およびその製造方法
EP2554699A1 (fr) Tôle d'acier présentant une résistance à la traction élevée et une meilleure ductilité et procédé de fabrication de cette dernière
EP3530769A1 (fr) Tôle en acier inoxydable martensitique
EP2792761A1 (fr) Poutre en h en acier de grande épaisseur et à haute résistance
WO2013094130A1 (fr) Feuille d'acier à haute résistance et son procédé de fabrication
KR102389019B1 (ko) 항복강도가 우수한 오스테나이트계 고망간 강재
KR101585724B1 (ko) 중심부 저온 파괴전파 저항성 및 항복비 특성이 동시에 우수한 후물 라인파이프 강재 및 그 제조방법
KR101952818B1 (ko) 강도 및 연성이 우수한 저합금 강판 및 이의 제조방법
WO2014045542A1 (fr) Tôle d'acier inoxydable ferritique qui est facilement usinée
JP6509187B2 (ja) 曲げ加工性に優れた高強度冷延鋼板及びその製造方法
JP6093063B1 (ja) 加工性に優れた高強度ステンレス鋼材とその製造方法
JP4606113B2 (ja) 比例限界応力の高いオーステナイト系ステンレス鋼材および製造法
CN114945689A (zh) 用于夹紧装置的高强度铁素体不锈钢及其制造方法
JP4432725B2 (ja) 伸びフランジ性に優れたＣｒ含有高強度冷延鋼板およびその製造方法
KR101560911B1 (ko) 우수한 열간압연성과 내식성을 갖는 경량 열연강판 및 그 제조방법
KR970010807B1 (ko) 프레스 성형성, 내시효 균열성, 내식성, 열간가공성 및 고온내산화성이 우수한 오스테나이트계 스테인레스강
KR101685842B1 (ko) 열연강판 및 그 제조 방법
KR20230089720A (ko) 오스테나이트계 스테인리스강 및 그 제조 방법
KR101560912B1 (ko) 우수한 열간압연성과 내식성을 갖는 경량 열연강판 및 그 제조방법

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190612

A4 Supplementary search report drawn up and despatched

Effective date: 20190819

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20220207

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20220618