EP0748877A1 - Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech - Google Patents

Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech Download PDF

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Publication number
EP0748877A1
EP0748877A1 EP96401263A EP96401263A EP0748877A1 EP 0748877 A1 EP0748877 A1 EP 0748877A1 EP 96401263 A EP96401263 A EP 96401263A EP 96401263 A EP96401263 A EP 96401263A EP 0748877 A1 EP0748877 A1 EP 0748877A1
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EP
European Patent Office
Prior art keywords
steel sheet
temperature
cooling
hot
sheet
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.)
Granted
Application number
EP96401263A
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English (en)
French (fr)
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EP0748877B1 (de
Inventor
Xavier Bano
Maurice Malta
Stéphane Fiori
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
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Publication of EP0748877A1 publication Critical patent/EP0748877A1/de
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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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the invention relates to a process for producing a strip of hot-rolled steel sheet with a very high yield strength which can be used in particular for shaping parts and having a brittle / ductile transition at a temperature below -50 ° C.
  • Controlled rolling makes it possible to maintain a low equivalent carbon level in the steel of the sheet and to obtain desired mechanical properties by refining the grain of ferritic structure and coherent precipitation of niobium carbonitride, the niobium being able to be associated with titanium. or vanadium.
  • a product such as a ULCB steel sheet (low carbon bainitic structure) has an elastic limit which can be greater than 700 MPa and a brittle / ductile transition temperature of approximately - 60 ° C.
  • flawless 180 ° bending of the steel sheet is limited to internal bending diameters greater than 2.5 times the thickness of the sheet in the rolling direction and greater than 3 times the thickness of the sheet in the cross direction of rolling.
  • a product such as a microalloyed steel sheet has an elastic limit greater than 700 MPa and can be bent at 180 ° without generating a defect for a bending diameter less than twice the thickness of the sheet metal but this steel has the drawback of having a ductile / brittle transition temperature of between -20 ° C and -40 ° C.
  • the object of the invention is to present a process for producing a strip of hot-rolled steel sheet with a very high elastic limit which can be used in particular. for the shaping of parts and having a possibility of folding at 180 ° without defect under a folding diameter less than twice the thickness of the sheet and a brittle / ductile transition at a temperature below -50 ° C.
  • Figure 1 is a curve showing schematically, according to the method of the invention, the temperature variation as a function of time, imposed on the strip of hot-rolled steel sheet.
  • FIG. 2 shows fragile / ductile transition curves for a steel sheet 5 mm thick, fragile / ductile transition measured in the long direction and in the transverse direction of the strip of hot-rolled sheet.
  • the basic composition makes it possible to obtain a granite ferrite and bainite microstructure hardened by the precipitation of niobium-titanium microalloy elements.
  • the rolling process according to the invention aims to obtain good recrystallization of the austenitic grains at the outlet of the stands of the rolling mill, thus making it possible to obtain an equiaxed structure.
  • the steel structure of the sheet metal strip allows high elongations of more than 15% up to 20% and bending at 180 ° without defects with internal bending diameters less than twice the thickness of the sheet .
  • the temperature of the end of rolling is greater than 850 ° C., and preferably 900 ° C. in order on the one hand to limit the precipitation of the microalloy elements induced by hot rolling and on the other hand , make the most of their hardening effect during controlled cooling.
  • Controlled cooling is imposed on the hot-rolled sheet strip after an interval of less than 10 seconds between the end of hot-rolling and the start of controlled cooling.
  • the time interval is of the order of 1.5 seconds, which ensures a very fine grain size and a high elastic limit.
  • the controlled cooling rates are chosen between 20 ° C per second and 100 ° C per second depending on the thickness of the sheet strip to be treated.
  • the controlled cooling rate is, on average, 40 ° C per second for a sheet metal strip about 5 mm thick. Under these conditions, there is hardening precipitation of the microalloy elements, which makes it possible to obtain an elastic limit greater than 700 MPa, or 740 MPa.
  • the temperature at the end of controlled cooling is between 550 ° C and 750 ° C and preferably 650 ° C, which ensures hardening precipitation of the microalloy elements.
  • Figure 1 is a diagram showing, according to the method of the invention, the temperature variation as a function of time, imposed on the strip of steel sheet after hot rolling. After rolling at a temperature above 850 ° C represented by the curve portion "a”, a period of less than 10 seconds, represented by the curve portion "b", is required before the controlled cooling of the sheet strip hot rolled which is represented by the portion of curve "c".
  • FIG. 2 shows two curves A and B of brittle / ductile transition, that is to say curves giving the fracture energy of a test piece taken from a sheet as a function of the temperature.
  • Curves A and B relate to a steel sheet 5 mm thick and the brittle / ductile transition is measured respectively in the long direction and in the cross direction of the hot rolled sheet.
  • the sheet steel strip according to the invention does not exhibit a brittle / ductile transition in the temperature range between + 20 ° C and -80 ° C. All the ruptures are therefore ductile down to -80 ° C.
  • the brittle / ductile transition temperature is therefore less than -80 ° C.
  • the method according to the invention allows the production of a hot-rolled steel sheet with a thickness of between 2.5 and 10 mm, sheet of which the steel has an elastic limit greater than 700 MPa.
  • the steel sheet can be subjected to a 180 ° folding without defect, the inside diameter of the folding can be less than twice the thickness of the sheet.
  • the low carbon content equivalent to 0.4% and the low manganese content give the steel excellent weldability.
  • Titanium participates in hardening by precipitation in the form of TiC.
  • Molybdenum allows, after precipitation of microalloy elements in the form of carbide, to limit the diffusion of carbon at high temperature thus ensuring obtaining fine precipitates in the ferritic matrix and lowering the brittle / ductile transition temperature at a temperature always located below -50 ° C in the case of a steel according to the composition defining the invention.
  • the strip of hot-rolled sheet according to the invention can be used for the manufacture of folded profiled or stamped parts of reduced thickness for their lightening and / or parts having better mechanical characteristics in fatigue.
  • the low brittle / ductile transition temperature offers the possibility of operating pieces of equipment, entering through example in the construction of cranes, in a very low temperature range without risk of fragile rupture.

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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 Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP96401263A 1995-06-15 1996-06-11 Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech Expired - Lifetime EP0748877B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9507122 1995-06-15
FR9507122A FR2735498B1 (fr) 1995-06-15 1995-06-15 Procede de realisation d'une bande de tole d'acier laminee a chaud a haute limite d'elasticite utlisable notamment pour la mise en forme

Publications (2)

Publication Number Publication Date
EP0748877A1 true EP0748877A1 (de) 1996-12-18
EP0748877B1 EP0748877B1 (de) 2001-03-07

Family

ID=9480017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401263A Expired - Lifetime EP0748877B1 (de) 1995-06-15 1996-06-11 Verfahren zur Herstellung von warmgewalztem Stahlblech mit sehr hoher Elastizitätsgrenze und Stahlblech

Country Status (6)

Country Link
US (1) US5716464A (de)
EP (1) EP0748877B1 (de)
AT (1) ATE199575T1 (de)
DE (1) DE69611950T2 (de)
ES (1) ES2156985T3 (de)
FR (1) FR2735498B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1099769A1 (de) * 1999-11-12 2001-05-16 Usinor Consultants Verfahren zur Herstellung von warmgewalztem, hochfestem Stahlblech zur Umformung und insbesondere zum Tiefziehen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3417878B2 (ja) * 1999-07-02 2003-06-16 株式会社神戸製鋼所 伸びフランジ性および疲労特性に優れた高強度熱延鋼板およびその製法
WO2001023624A1 (fr) * 1999-09-29 2001-04-05 Nkk Corporation Tole d'acier et son procede de fabrication
JP6252291B2 (ja) * 2014-03-26 2017-12-27 新日鐵住金株式会社 鋼板及びその製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2133952A1 (de) * 1971-04-20 1972-12-01 Nippon Kokan Kk
US3976514A (en) * 1975-02-10 1976-08-24 Nippon Steel Corporation Method for producing a high toughness and high tensil steel
DE2517164A1 (de) * 1975-04-18 1976-10-21 Rheinstahl Giesserei Ag Verwendung einer schweissbaren, hoeherfesten stahllegierung fuer dickwandige stahlgusserzeugnisse
EP0535238A1 (de) * 1991-03-13 1993-04-07 Kawasaki Steel Corporation Hochfestes stahlblech für die umformung und dessen herstellung
WO1995026424A1 (en) * 1994-03-29 1995-10-05 Nippon Steel Corporation Steel plate excellent in prevention of brittle crack propagation and low-temperature toughness and process for producing the plate

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6220821A (ja) * 1985-07-17 1987-01-29 Nippon Steel Corp 高強度厚鋼板の製造法
JP3031485B2 (ja) * 1990-11-28 2000-04-10 川崎製鉄株式会社 降伏伸びに優れた高強度鉄筋の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2133952A1 (de) * 1971-04-20 1972-12-01 Nippon Kokan Kk
US3976514A (en) * 1975-02-10 1976-08-24 Nippon Steel Corporation Method for producing a high toughness and high tensil steel
DE2517164A1 (de) * 1975-04-18 1976-10-21 Rheinstahl Giesserei Ag Verwendung einer schweissbaren, hoeherfesten stahllegierung fuer dickwandige stahlgusserzeugnisse
EP0535238A1 (de) * 1991-03-13 1993-04-07 Kawasaki Steel Corporation Hochfestes stahlblech für die umformung und dessen herstellung
WO1995026424A1 (en) * 1994-03-29 1995-10-05 Nippon Steel Corporation Steel plate excellent in prevention of brittle crack propagation and low-temperature toughness and process for producing the plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1099769A1 (de) * 1999-11-12 2001-05-16 Usinor Consultants Verfahren zur Herstellung von warmgewalztem, hochfestem Stahlblech zur Umformung und insbesondere zum Tiefziehen
FR2801061A1 (fr) * 1999-11-12 2001-05-18 Lorraine Laminage Procede de realisation d'une bande de tole laminere a chaud a tres haute resistance, utilisable pour la mise en forme et notamment pour l'emboutissage
US6475308B1 (en) 1999-11-12 2002-11-05 Unisor Process for the production of a strip of hot rolled steel of very high strength, usable for shaping and particularly for stamping
US6797078B2 (en) 1999-11-12 2004-09-28 Usinor Strip of hot rolled steel of very high strength, usable for shaping and particularly for stamping

Also Published As

Publication number Publication date
ES2156985T3 (es) 2001-08-01
DE69611950D1 (de) 2001-04-12
FR2735498A1 (fr) 1996-12-20
EP0748877B1 (de) 2001-03-07
ATE199575T1 (de) 2001-03-15
US5716464A (en) 1998-02-10
DE69611950T2 (de) 2001-06-21
FR2735498B1 (fr) 1997-07-11

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