Global Patent Index - EP 2576848 B1

EP 2576848 B1 20161207 - METHOD FOR PRODUCING A HOT-ROLLED STEEL PRODUCT, AND A HOT-ROLLED STEEL

Title (en)

METHOD FOR PRODUCING A HOT-ROLLED STEEL PRODUCT, AND A HOT-ROLLED STEEL

Title (de)

VERFAHREN ZUR HERSTELLUNG EINES HEISSGEWALZTEN STAHLPRODUKTS UND HEISSGEWALZTER STAHL

Title (fr)

PROCÉDÉ POUR LA PRODUCTION D'UN PRODUIT DE TYPE ACIER LAMINÉ À CHAUD ET ACIER LAMINÉ À CHAUD

Publication

EP 2576848 B1 20161207 (EN)

Application

EP 11743330 A 20110607

Priority

  • FI 20100239 A 20100607
  • IB 2011001436 W 20110607

Abstract (en)

[origin: WO2011154831A1] The invention relates to a method for producing a hot-rolled steel from a steel, whose composition as percentages by weight is C 0.075 - 0.12% Si 0.1 - 0.8% Mn 0.8 - 1.7% Al 0.015 - 0.08% P less than 0.012% s less than 0.005% Cr 0.2 - 1.3% Mo 0.15 - 0.80% Ti 0.01 - 0.05% B 0.0005 - 0.003% V 0.02 - 0.10% Nb less than 0.3% Ni less than 1% Cu less than 0.5% the rest being iron and unavoidable impurities. The invention relates in particular to direct quenched martensitic sheet-like steels, on which temper annealing is conducted, i.e. tempering steels and their production. The hot-rolled steel according to the invention is exceptionally temper-resistant after the direct quenching process, wherein by tempering it is made further high-strength (Rp0.2=890MPa) combined at the same time with good impact toughness (Charpy V (-20°C) =37J/cm2 ) and flangeability as well as good weldability.

IPC 8 full level

C21D 1/25 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01)

CPC (source: EP FI)

C21D 1/25 (2013.01 - EP); C21D 6/004 (2013.01 - FI); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP FI); C21D 8/0426 (2013.01 - EP); C21D 8/0463 (2013.01 - EP); C22C 38/42 (2013.01 - FI); C22C 38/44 (2013.01 - FI); C22C 38/50 (2013.01 - FI); C22C 38/54 (2013.01 - FI); C21D 2211/008 (2013.01 - EP)

Citation (examination)

  • GRANGE R A ET AL: "Hardness of Tempered Martensite in Carbon and Low-Alloy Steels", METALLURGICAL TRANSACTIONS, METALLURGICAL SOCIETY OF AIME. NEW YORK, US, vol. 8A, 1 November 1977 (1977-11-01), pages 1775 - 1785, XP003030859
  • S. S. HANSEN, K. A. TAYLOR: "EFFECTS OF VANADIUM AND PROCESSING PARAMETERS ON THE STRUCTURES AND PROPERTIES OF A DIRECT-QUENCHED LOW-CARBON MO-B STEEL", METALLURGICAL TRANSACTIONS A OCTOBER 1991, VOLUME 22,, vol. 22, no. 10, 1 October 1991 (1991-10-01), pages 2359 - 2374

Citation (opposition)

Opponent : ArcelorMittal

Designated contracting state (EPC)

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

DOCDB simple family (publication)

WO 2011154831 A1 20111215; WO 2011154831 A4 20120308; CN 103097556 A 20130508; CN 103097556 B 20160120; EP 2576848 A1 20130410; EP 2576848 B1 20161207; FI 122313 B 20111130; FI 20100239 A0 20100607

DOCDB simple family (application)

IB 2011001436 W 20110607; CN 201180039212 A 20110607; EP 11743330 A 20110607; FI 20100239 A 20100607