EP0481844B1 - Stahl mit verbesserter Schweissbarkeit - Google Patents

Stahl mit verbesserter Schweissbarkeit Download PDF

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Publication number
EP0481844B1
EP0481844B1 EP91402670A EP91402670A EP0481844B1 EP 0481844 B1 EP0481844 B1 EP 0481844B1 EP 91402670 A EP91402670 A EP 91402670A EP 91402670 A EP91402670 A EP 91402670A EP 0481844 B1 EP0481844 B1 EP 0481844B1
Authority
EP
European Patent Office
Prior art keywords
steel
nickel
improved weldability
silicon
manganese
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.)
Revoked
Application number
EP91402670A
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English (en)
French (fr)
Other versions
EP0481844A1 (de
Inventor
Thierry Maurickx
Pascal Verrier
Roland Taillard
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9401369&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0481844(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0481844A1 publication Critical patent/EP0481844A1/de
Application granted granted Critical
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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
    • 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

Definitions

  • the present invention relates to a structural steel with improved weldability.
  • the grades of steel for welded constructions must satisfy a high level of brittle tensile strength at low temperature, this temperature being a function of the stress conditions and the service temperature of the structure.
  • CTOD Chip Tip Opening Displacement
  • Fig. 1 represents the transition temperature for a resilience energy of 28 joules as a function of the cooling time from 700 ° to 300 ° C, for a steel of type 355 EMZ.
  • the resistance to cold cracking of such steel can be assessed from the hardness-cooling criterion shown in FIG. 2.
  • the Vickers hardness is greater than 350Hv5. This is explained by the fact that the structure has 80 to 100% martensite.
  • EP-A-168.038 discloses steel plates with high tensile strength and usable in welded constructions.
  • the weight composition areas of steel are: from 0.03 to 0.20% carbon, from 0.01 to 0.70% of silicon, from 0.50 to 1.80% manganese, from 0.005 to 0.05% of titanium or zirconium, from 0.005 to 0.10% niobium, with, among the optional elements, not more than 0.0030% nitrogen, not more than 4.00% of Nickel, not more than 1.00% copper, the rest being iron.
  • FR-A-2,500,482 is a steel for welding whose weight composition is as follows: from 0.03 to 0.16% carbon, from 0.01 to 0.7% of silicon, from 0.7 to 1.7% of manganese, from 0.04 to 0.10% aluminum, not more than 0.004% nitrogen, not more than 0.50% copper, not more than 1.5% nickel, the rest being iron.
  • the subject of the present invention is a steel with improved weldability having good resilience for high welding energies and not requiring preheating before welding.
  • Such a steel therefore has good resilience even at high welding energy.
  • the hardness-cooling criteria curve shown in Fig. 2 shows that the steel with improved weldability has a lower hardness than that of conventional steel 355 EMZ.
  • the Vickers hardness for cooling the area affected by heat from 700 ° to 300 ° C in 10s is only 280 HV5, against at least 350 HV5 for common steel.
  • the improved weldability steel according to the invention now has very little martensite, less than 20%.
  • Such a steel therefore makes it possible either to guarantee the same characteristics as the usual 355 EMZ steel but to weld with higher welding energies, or by retaining the same welding energy, to guarantee the mechanical characteristics of toughness at a service temperature. weaker allowing then to consider applications in a harsher environment.
  • the transition temperature at 28 Joules is of the order of -70 ° C.
  • this temperature below which an energy necessary for rupture at least equal to 28 Joules is guaranteed is no more than -50 ° C.
  • the improvement in the toughness of the welded joint involves the reduction of the volume fraction of austenite retained which is ensured by the reduction of the silicon content of the steel.
  • Steel with improved weldability can be obtained for example by ladle casting, continuous casting, production in an oven, production in an oxygen steelworks or aluminum quenching.
  • the description below relates to an example of a method for obtaining sheets 50mm thick with steel according to the present invention.
  • the steel with improved weldability according to the invention is obtained by continuous casting of a known type, taking the necessary precautions to combat segregation.
  • the steel undergoes heating at low temperature between the ferrite-austenite transformation temperature AC3 and 1100 ° C., followed by rolling.
  • the temperature at the end of rolling is between 850 ° and 720 ° C.
  • the steel then undergoes accelerated cooling from the end of rolling temperature to 450 ° C at a speed of 3 to 10 ° C per second.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Arc Welding In General (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Claims (4)

  1. Stahl mit verbesserter Schweißbarkeit mit der folgenden gewichtsmäßigen Zusammensetzung:
    - 0,07 bis 0,11 % Kohlenstoff,
    - 1,40 bis 1,70 % Mangan,
    - 0,20 bis 0,55 % Nickel,
    - 0 bis 0,30 % Kupfer,
    - 0 bis 0,02 % Niob,
    - 0,005 bis 0,020 % Titan,
    - 0,002 bis 0,006 % Stickstoff,
    - 0 bis 0,15 % Silicium,
       wobei der Rest Eisen ist.
  2. Stahl nach Anspruch 1, der vorzugsweise die folgende gewichtsmäßige Zusammensetzung hat:
    - 0,08 % Kohlenstoff,
    - 1,50 % Mangan,
    - 0,45 % Nickel,
    - 0,20 % Kupfer,
    - 0,01 % Titan,
    - 0,004 % Stickstoff,
    - 0,09 % Silicium,
       wobei der Rest Eisen ist.
  3. Verfahren zur Herstellung eines Stahls nach den Ansprüchen 1 und 2, das die folgenden Schritte umfaßt:
    - man erhitzt auf niedrige Temperatur zwischen der Temperatur der Umwandlung Ferrit-Austenit AC3 und 1100°C,
    - man walzt zwischen 850° und 720°C,
    - man nimmt eine beschleunigte Abkühlung von 750° bis 450°C mit einer Geschwindigkeit von 3 bis 10° pro Sekunde vor.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß
    - man 3 h auf 950°C erhitzt,
    - zwischen 760° und 740°C walzt,
    - mit einer Geschwindigkeit von 6° pro Sekunde bis auf 550°C abkühlt.
EP91402670A 1990-10-18 1991-10-07 Stahl mit verbesserter Schweissbarkeit Revoked EP0481844B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9012916 1990-10-18
FR9012916A FR2668169B1 (fr) 1990-10-18 1990-10-18 Acier a soudabilite amelioree.

Publications (2)

Publication Number Publication Date
EP0481844A1 EP0481844A1 (de) 1992-04-22
EP0481844B1 true EP0481844B1 (de) 1995-08-02

Family

ID=9401369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402670A Revoked EP0481844B1 (de) 1990-10-18 1991-10-07 Stahl mit verbesserter Schweissbarkeit

Country Status (11)

Country Link
US (1) US5183633A (de)
EP (1) EP0481844B1 (de)
JP (1) JPH04297549A (de)
KR (1) KR940004033B1 (de)
AT (1) ATE125878T1 (de)
CA (1) CA2053197C (de)
DE (1) DE69111744T2 (de)
ES (1) ES2076490T3 (de)
FI (1) FI100340B (de)
FR (1) FR2668169B1 (de)
NO (1) NO178796C (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2728591B1 (fr) * 1994-12-27 1997-01-24 Lorraine Laminage Acier a soudabilite amelioree
TW444109B (en) * 1997-06-20 2001-07-01 Exxon Production Research Co LNG fuel storage and delivery systems for natural gas powered vehicles
TW436597B (en) * 1997-12-19 2001-05-28 Exxon Production Research Co Process components, containers, and pipes suitable for containign and transporting cryogenic temperature fluids
JP3524790B2 (ja) 1998-09-30 2004-05-10 株式会社神戸製鋼所 塗膜耐久性に優れた塗装用鋼材およびその製造方法
JP2003124783A (ja) * 2001-10-10 2003-04-25 Mitsubishi Electric Corp Ｇｍ−Ｃフィルタ
AU2002365596B2 (en) 2001-11-27 2007-08-02 Exxonmobil Upstream Research Company CNG fuel storage and delivery systems for natural gas powered vehicles
US6852175B2 (en) * 2001-11-27 2005-02-08 Exxonmobil Upstream Research Company High strength marine structures

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168038A2 (de) * 1984-07-10 1986-01-15 Nippon Steel Corporation Stahl mit hoher Bruchfestigkeit und hoher Zähigkeit

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4861316A (de) * 1971-12-04 1973-08-28
CA1003311A (en) * 1972-12-31 1977-01-11 Hiroshi Takechi High tensile strength structural steel and the manufacture thereof
JPS5526164B2 (de) * 1973-07-31 1980-07-11
DE2517164A1 (de) * 1975-04-18 1976-10-21 Rheinstahl Giesserei Ag Verwendung einer schweissbaren, hoeherfesten stahllegierung fuer dickwandige stahlgusserzeugnisse
GB2099016B (en) * 1981-02-26 1985-04-17 Nippon Kokan Kk Steel for welding with high heat input
JPS5877528A (ja) * 1981-10-31 1983-05-10 Nippon Steel Corp 低温靭性の優れた高張力鋼の製造法
JPS59110725A (ja) * 1982-12-16 1984-06-26 Kawasaki Steel Corp 溶接性と低温靭性の優れた高張力鋼の製造方法
JPS6089550A (ja) * 1983-10-21 1985-05-20 Sumitomo Metal Ind Ltd 溶接性に優れた耐候性鋼
JPS60174820A (ja) * 1984-02-17 1985-09-09 Kawasaki Steel Corp 低温じん性及び大入熱溶接性が優れた調質高張力鋼の製造方法
JPS6293346A (ja) * 1985-10-18 1987-04-28 Nippon Steel Corp 溶接部のｃｏｄ特性の優れた高張力鋼
JPS63103051A (ja) * 1986-10-20 1988-05-07 Kawasaki Steel Corp 高靭性溶接用鋼

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0168038A2 (de) * 1984-07-10 1986-01-15 Nippon Steel Corporation Stahl mit hoher Bruchfestigkeit und hoher Zähigkeit

Also Published As

Publication number Publication date
US5183633A (en) 1993-02-02
KR940004033B1 (ko) 1994-05-11
NO914055D0 (no) 1991-10-16
FR2668169B1 (fr) 1993-01-22
NO914055L (no) 1992-04-21
FR2668169A1 (fr) 1992-04-24
DE69111744T2 (de) 1996-01-18
FI100340B (fi) 1997-11-14
KR920008204A (ko) 1992-05-27
JPH04297549A (ja) 1992-10-21
ATE125878T1 (de) 1995-08-15
NO178796C (no) 1996-06-05
EP0481844A1 (de) 1992-04-22
FI914907L (fi) 1992-04-19
DE69111744D1 (de) 1995-09-07
CA2053197C (fr) 1997-09-09
NO178796B (no) 1996-02-26
ES2076490T3 (es) 1995-11-01
FI914907A0 (fi) 1991-10-17
CA2053197A1 (fr) 1992-04-19

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