EP 2905348 B1 20190904 - High strength flat steel product with bainitic-martensitic structure and method for manufacturing such a flat steel product
Title (en)
High strength flat steel product with bainitic-martensitic structure and method for manufacturing such a flat steel product
Title (de)
Hochfestes Stahlflachprodukt mit bainitisch-martensitischem Gefüge und Verfahren zur Herstellung eines solchen Stahlflachprodukts
Title (fr)
Produit en acier plat de haute résistance avec une structure bainitique-martensitique et procédé de fabrication d'un tel produit acier plat
Publication
Application
Priority
EP 14154354 A 20140207
Abstract (en)
[origin: CA2936733A1] A flat steel product according to the invention, which not only has optimum mechanical properties, such as a high strength combined with good toughness, but also has good suitability for welding, has, in the hot-rolled state, a ferrite-free microstructure consisting to an extent of = 95% by volume of martensite and bainite, with a martensite proportion of = 5% by volume and in total = 5% by volume residual austenite and also production-related unavoidable microstructure constituents. In addition to Fe and unavoidable impurities, the flat steel product according to the invention additionally comprises (in % by weight) 0.08 - 0.10% C, 0.015 - 0.50% Si, 1.20 - 2.00% Mn, 0.020 - 0.040% Al, 0.30 - 1.00% Cr, 0.20 - 0.30% Mo, 0.020 - 0.030% Nb, 0.0015 - 0.0025% B, up to 0.025% P, up to 0.010% S, up to 0.006% N, in particular 0.001 - 0.006% N. The impurities include up to 0.12% Cu, up to 0.090% Ni, up to 0.0030% Ti, up to 0.009% V, up to 0.0090% Co, up to 0.004% Sb and up to 0.0009% W. The invention additionally provides a method which makes it possible to produce a flat steel product according to the invention reliably and with reduced complexity.
IPC 8 full level
C21D 8/02 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/40 (2006.01); C22C 38/46 (2006.01)
CPC (source: EP RU US)
C21D 6/002 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 8/02 (2013.01 - RU); C21D 8/0226 (2013.01 - EP US); C21D 8/0263 (2013.01 - EP US); C21D 9/46 (2013.01 - EP RU US); C22C 38/00 (2013.01 - RU); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/32 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (examination)
CN 103146997 A 20130612 - BAOSHAN IRON & STEEL & EP 2980255 A1 20160203 - BAOSHAN IRON & STEEL [CN]
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)
EP 2905348 A1 20150812; EP 2905348 B1 20190904; AU 2015215080 A1 20160818; AU 2015215080 B2 20190411; BR 112016016949 B1 20210309; CA 2936733 A1 20150813; CA 2936733 C 20190226; MX 2016009530 A 20161026; RU 2016135949 A 20180315; RU 2016135949 A3 20180724; RU 2675191 C2 20181217; US 10724113 B2 20200728; US 2017081739 A1 20170323; WO 2015117934 A1 20150813
DOCDB simple family (application)
EP 14154354 A 20140207; AU 2015215080 A 20150203; BR 112016016949 A 20150203; CA 2936733 A 20150203; EP 2015052135 W 20150203; MX 2016009530 A 20150203; RU 2016135949 A 20150203; US 201515116958 A 20150203