[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

Global Patent Index - EP 1399598 B2

EP 1399598 B2 20110223 - METHOD FOR PRODUCING HIGH-STRENGTH COLD-FORMED STEEL PRODUCTS FROM A HOT ROLLED STRIP, SAID PRODUCTS EXHIBITING GOOD MALLEABILITY

Title (en)

METHOD FOR PRODUCING HIGH-STRENGTH COLD-FORMED STEEL PRODUCTS FROM A HOT ROLLED STRIP, SAID PRODUCTS EXHIBITING GOOD MALLEABILITY

Title (de)

VERFAHREN ZUM HERSTELLEN VON HOCHFESTEN, AUS EINEM WARMBAND KALTVERFORMTEN STAHLPRODUKTEN MIT GUTER DEHNBARKEIT

Title (fr)

PROCEDE POUR FABRIQUER DES PRODUITS EN ACIER DE GRANDE RESISTANCE ET DE BONNE MALLEABILITE, FORMES A FROID A PARTIR D'UN FEUILLARD LAMINE A CHAUD

Publication

EP 1399598 B2 20110223 (DE)

Application

EP 02738172 A 20020621

Priority

  • DE 10130774 A 20010626
  • EP 0206870 W 20020621

Abstract (en)

[origin: WO03002772A1] The invention relates to a method for producing a high-strength cold-formed product from a hot-rolled strip, said product exhibiting good malleability. According to said method, a steel comprising (in wt.%): C: 0.01 0.25 %, Si: 0.01 1.50 %, Mn: 0.50 2.00 %, P: <= 0.08 %, S: <= 0.01 %, Al: 0.001 1.50 %, Cr: <= 0.60 %, Mo: <= 0.60 %, N: < 0.02 %, at least one micro-alloy element from the group Ti: <= 0.20 %, Nb: <= 0.06 %, V: <= 0.15 %, the remainder being iron and the usual impurities is cast to form an input stock such as slabs, thin slabs or a cast strip. Starting from an initial hot-roll temperature, at which the micro-alloy elements remain essentially dissolved, the input stock is hot-rolled to form a hot-rolled strip. Said strip is firstly wound at a winding temperature of less than 600 DEG C and then cold formed into a product at a cold formation degree which is not less than 2 % and not greater than the deformation limit. The cold-formed product is annealed at a temperature and for a period which are less those required for complete recrystallization. The inventive method enables a cold formed product to be produced, said product exhibiting high strength, malleability and plasticity in the cold formed state.

IPC 8 full level

C21D 8/02 (2006.01)

CPC (source: EP)

C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 8/0278 (2013.01)

Citation (opposition)

Opponent :

  • EP 0966547 B1 20011004 - THYSSENKRUPP STAHL AG [DE]
  • US 3950190 A 19760413 - LAKE PETER B
  • US 4067754 A 19780110 - ELIAS JAMES A, et al
  • GB 1529626 A 19781025 - ARMCO STEEL CORP
  • US 4082576 A 19780404 - LAKE PETER B, et al
  • EP 1067203 B1 20040303 - USINOR [FR]
  • LAKE P.B.; GRENAWALT J.J.: "Partially annealed high strength cold rolled steels", SAE PAPER 770163
  • MOULD P.R.: "An overview of continuous annealing technology for steel sheet products", METALLURGY OF CONTINUOUS-ANNEALED SHEET STEEL, 15 February 1982 (1982-02-15) - 16 February 1982 (1982-02-16), U.S. STEEL RESEARCH LABORATORY, pages 3 - 33
  • SCHNEIDER E.J.; POLLARD B.: "Titanium-Bearing High Strength Cold Rolled Steels", MECHANICAL WORKING AND STEEL PROCESSING XVIII, 29 October 1980 (1980-10-29) - 30 October 1980 (1980-10-30), TORONTO, ONTARIO, pages 398 - 428
  • CAHN R.W. ET AL: "Materials Science and Technology", 1992, article F.B. PICKERING: "Constitution and Properties of Steels Seiten 49,272,273,337,350 and 351"
  • GLADMAN T.: "The Physical Metallurgy of Microalloyed Steels", 1997, INSTITUTE OF MATERIALS, UK, ISBN: 0910716812, pages: 231, 615
  • PEARCE R.: "Sheet Metal Forming", 1991, IOP PUBLISHING, BRISTOL, pages: 141 - 169
  • "The Making, Shaping and Treating of Steel", 1985, ASSOCIATION OF IRON AND STEEL ENGINEERS, USA, ISBN: 0930767004, pages: 1065, 10THED
  • VAN VLACK L.H.: "Elements of Materials Science and Engineering", 1980, ADDISON-WESLEY PUBLISHING COMPANY, ISBN: 0201080818, pages: 204 - 211, 4.ED.
  • PENNING J. ET AL: "The development of recovery annealed steels", INTERNATIONAL JOURNAL OF MATERIALS AND PRODUCT TECHNOLOGY, vol. 10, no. 3-6, 1995, pages 325 - 337
  • VANDERSCHUEREN D.; VANDEPUTTE S., INDUSTRIAL DEVELOPMENT OF IF HIGH STRENGTH STEELS WITH AND WITHOUT BH, vol. XXXVI, 1998, 40TH MWSP CONFERENCE PROCEEDINGS, pages 205 - 211

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

WO 03002772 A1 20030109; AT E279540 T1 20041015; DE 10130774 C1 20021212; DE 50201321 D1 20041118; EP 1399598 A1 20040324; EP 1399598 B1 20041013; EP 1399598 B2 20110223; ES 2230500 T3 20050501

DOCDB simple family (application)

EP 0206870 W 20020621; AT 02738172 T 20020621; DE 10130774 A 20010626; DE 50201321 T 20020621; EP 02738172 A 20020621; ES 02738172 T 20020621