EP0098564B1 - Verfahren zur Herstellung von feinkörnigen, schweissbaren Grossrohrblechen - Google Patents

Verfahren zur Herstellung von feinkörnigen, schweissbaren Grossrohrblechen Download PDF

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Publication number
EP0098564B1
EP0098564B1 EP83106483A EP83106483A EP0098564B1 EP 0098564 B1 EP0098564 B1 EP 0098564B1 EP 83106483 A EP83106483 A EP 83106483A EP 83106483 A EP83106483 A EP 83106483A EP 0098564 B1 EP0098564 B1 EP 0098564B1
Authority
EP
European Patent Office
Prior art keywords
temperature
rolling
process according
titanium
niobium
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.)
Expired
Application number
EP83106483A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0098564A1 (de
Inventor
Michael Dr.-Ing. Gräf
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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=6168326&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0098564(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT83106483T priority Critical patent/ATE19099T1/de
Publication of EP0098564A1 publication Critical patent/EP0098564A1/de
Application granted granted Critical
Publication of EP0098564B1 publication Critical patent/EP0098564B1/de
Expired legal-status Critical Current

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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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • 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
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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
    • C21D8/0231—Warm rolling

Definitions

  • the invention relates to a method for producing fine-grained, weldable large-diameter tube sheets from a micro-alloyed steel having the following composition
  • Remainder iron and usual admixtures including calcium, if necessary, the titanium content being adjusted to about 3.5 to 4 times the nitrogen content present.
  • the percentages indicate percentages by weight.
  • the titanium content of the steel is in the range of 0.008 to 0.025%.
  • the titanium content is not matched to the nitrogen content.
  • Niobium is not a mandatory alloying element.
  • the steels are TiN-controlled steels in terms of precipitation hardening and grain refinement. After continuous casting, one works at a high cooling speed in order to produce a large number of fine, quasi-fine-grained TiN precipitates, the size of which does not exceed 0.05 Jlm. Thereafter, precautions are taken to ensure that the size of the fine TiN precipitates does not increase in the further process and that the very fine TiN precipitates are also present in the finished rolled heavy plate.
  • niobium can also be added to the steel, up to a maximum of 0.08%. However, this addition is not mandatory.
  • This addition of niobium which can be combined with a considerable addition of vanadium, nickel and chromium, is expected to improve the strength and toughness.
  • vanadium and / or nickel and / or chromium an improvement in the strength and toughness of the steels grown to a high content of fine TiN precipitates cannot be confirmed.
  • the element niobium does not work as expected with steels controlled by TiN, since the low annealing temperature of the continuous cast slabs does not sufficiently dissolve the niobium bonds. If the titanium content is low in the known measures, the niobium forms NbCN with the effect of reducing the strength properties. If there is too much titanium, the toughness is impaired, including TiC.
  • the invention has for its object to perform the method for a steel containing niobium as a compulsory microalloying element so that the large tube sheets are not controlled by TiN, but are controlled by niobium in terms of precipitation hardening and grain refinement.
  • the continuous cooling is carried out at a high cooling rate, with TiN precipitates being formed.
  • the invention is based on the knowledge that titanium can perform a completely different function in a microalloyed steel of the specified composition with niobium as a compelling purification element than in a TiN-controlled steel. Titanium only acts as a denitrification element and prevents the formation of NbCN when cooling from the continuous casting temperature, i.e. of niobium carbonitride.
  • the process is carried out in such a way that the enlargement of the TiN precipitates which is to be carefully avoided according to the prior art (DE-OS 30 12 139, DE-OS 31 46 950) occurs precisely because the specified higher heating is used.
  • the temperature at which the described enlargement of the TiN precipitates and the dissolution of the Nb bonds take place can be set as the annealing temperature.
  • the time required for the treatment can easily be determined experimentally, ensures that the niobium dissolves in the austenite and can be determined by the limits specified for the size of the TiN precipitates. In general, the effects described already occur when the continuous cast slabs are heated.
  • thermomechanical rolling is carried out at a temperature between 820 and 790 ° C, finish rolling at a temperature between 700 and 680 ° C. It is within the scope of the invention, after the finish rolling, to cool the large tube sheet with water at a speed of more than 15 ° C. per second on average to a temperature between 550 and 500 ° C. and then in air to room temperature. As a result, the strength is increased again without a loss of toughness and without the need for special alloying elements.
  • Ferritic-pearlitic structure with a grain size of 11 to 12 ASTM.
  • Ferritic-bainitic structure that corresponds to a grain size of less than 12 ASTM.
  • the large pipes formed from the sheets produced according to the invention are particularly suitable for use as line pipes in permafrost areas because of the outstanding technological values.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heat Treatment Of Articles (AREA)
  • Piles And Underground Anchors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Rod-Shaped Construction Members (AREA)
EP83106483A 1982-07-09 1983-07-02 Verfahren zur Herstellung von feinkörnigen, schweissbaren Grossrohrblechen Expired EP0098564B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83106483T ATE19099T1 (de) 1982-07-09 1983-07-02 Verfahren zur herstellung von feinkoernigen, schweissbaren grossrohrblechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3226160 1982-07-09
DE3226160 1982-07-09

Publications (2)

Publication Number Publication Date
EP0098564A1 EP0098564A1 (de) 1984-01-18
EP0098564B1 true EP0098564B1 (de) 1986-04-09

Family

ID=6168326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106483A Expired EP0098564B1 (de) 1982-07-09 1983-07-02 Verfahren zur Herstellung von feinkörnigen, schweissbaren Grossrohrblechen

Country Status (11)

Country Link
US (1) US4494999A (no)
EP (1) EP0098564B1 (no)
JP (2) JPS5913023A (no)
AT (1) ATE19099T1 (no)
AU (2) AU1618983A (no)
CA (1) CA1211343A (no)
CS (1) CS330783A2 (no)
CZ (1) CZ278612B6 (no)
MX (1) MX159207A (no)
NO (1) NO161507C (no)
SK (1) SK277820B6 (no)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415590A1 (de) * 1984-04-24 1985-10-31 Mannesmann AG, 4000 Düsseldorf Verwendung eines stahls in schwefelwasserstoffhaltigen medien
DE3437637A1 (de) * 1984-10-13 1986-04-24 Thyssen Stahl AG, 4100 Duisburg Verfahren zur herstellung von grobblech
DE3474042D1 (en) * 1984-10-30 1988-10-20 Ssab Svenskt Stal Ab Method for producing high strength steel with good ductility
DE4033700C1 (no) * 1990-10-19 1992-02-06 Stahlwerke Peine-Salzgitter Ag, 3150 Peine, De
US5200005A (en) * 1991-02-08 1993-04-06 Mcgill University Interstitial free steels and method thereof
US5858130A (en) * 1997-06-25 1999-01-12 Bethlehem Steel Corporation Composition and method for producing an alloy steel and a product therefrom for structural applications
US6087418A (en) * 1998-01-22 2000-07-11 Nippon Shokubai Co., Ltd. Cement admixture and cement composition
US6395109B1 (en) 2000-02-15 2002-05-28 Cargill, Incorporated Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
EP1337678B1 (en) * 2000-12-01 2007-10-03 Posco Steel plate to be precipitating tin+mns for welded structures, method for manufacturing the same and welding fabric using the same
CN100525953C (zh) * 2005-12-26 2009-08-12 天津钢管集团股份有限公司 一种防止石油套管用连铸钢坯表面裂纹的工艺方法
CN107866538B (zh) * 2017-11-24 2020-06-19 南京钢铁股份有限公司 一种含钒含氮微合金化包晶钢的方坯连铸生产方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56488B2 (no) * 1973-03-19 1981-01-08
JPS5161473A (en) * 1974-11-27 1976-05-28 Nippon Kokan Kk Kosokukonoritsugasushiirudoaakuyosetsunyoru atsunikuteionyokochoryokukokanno seizoho
JPS52101627A (en) * 1976-02-23 1977-08-25 Sumitomo Metal Ind Ltd Non-tempered shape steel in low temp. toughness
JPS52128821A (en) * 1976-04-12 1977-10-28 Nippon Steel Corp Preparation of high tensile steel having superior low temperature toughness and yield point above 40 kg/pp2
CA1084310A (en) * 1976-04-12 1980-08-26 Hiroaki Masui High tension steel sheet product
US4138278A (en) * 1976-08-27 1979-02-06 Nippon Steel Corporation Method for producing a steel sheet having remarkably excellent toughness at low temperatures
JPS54132421A (en) * 1978-04-05 1979-10-15 Nippon Steel Corp Manufacture of high toughness bainite high tensile steel plate with superior weldability
JPS55100924A (en) * 1979-01-25 1980-08-01 Nippon Steel Corp Production of high toughness bainite high tension steel plate having excellent weldability
JPS5814848B2 (ja) 1979-03-30 1983-03-22 新日本製鐵株式会社 非調質高強度高靭性鋼の製造法
JPS601929B2 (ja) * 1980-10-30 1985-01-18 新日本製鐵株式会社 強靭鋼の製造法
JPS5792129A (en) 1980-11-27 1982-06-08 Nippon Steel Corp Production of nonrefined high toughness steel

Also Published As

Publication number Publication date
JPH0647695B2 (ja) 1994-06-22
CS330783A2 (en) 1984-06-18
AU551994B2 (en) 1986-05-15
SK515783A3 (en) 1995-03-08
NO161507C (no) 1989-08-23
EP0098564A1 (de) 1984-01-18
ATE19099T1 (de) 1986-04-15
AU1663283A (en) 1984-01-12
US4494999A (en) 1985-01-22
CZ515783A3 (en) 1994-01-19
SK277820B6 (en) 1995-03-08
NO832485L (no) 1984-01-10
NO161507B (no) 1989-05-16
CA1211343A (en) 1986-09-16
MX159207A (es) 1989-05-02
JPS5967315A (ja) 1984-04-17
CZ278612B6 (en) 1994-04-13
JPS5913023A (ja) 1984-01-23
AU1618983A (en) 1984-01-12

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