EP 3610049 A1 20200219 - COLD-ROLLED FLAT STEEL PRODUCT ANNEALED IN A BELL-TYPE FURNACE, AND METHOD FOR THE PRODUCTION OF SAID PRODUCT
Title (en)
COLD-ROLLED FLAT STEEL PRODUCT ANNEALED IN A BELL-TYPE FURNACE, AND METHOD FOR THE PRODUCTION OF SAID PRODUCT
Title (de)
KALTGEWALZTES, HAUBENGEGLÜHTES STAHLFLACHPRODUKT UND VERFAHREN ZU DESSEN HERSTELLUNG
Title (fr)
PRODUIT PLAT EN ACIER LAMINÉ À FROID, RECUIT SUR BASE, ET PROCÉDÉ DE FABRICATION S'Y RAPPORTANT
Publication
Application
Priority
- EP 2017058639 W 20170411
- EP 2017068405 W 20170720
Abstract (en)
[origin: WO2018188766A1] The invention relates to a cold-rolled flat steel product which consists of a steel belonging to the high-manganese steels and, after annealing in a bell-type furnace, has a combination of properties which makes it suitable for use in particular in manufacturing car bodies. The cold-rolled flat steel product annealed in a bell-type furnace according to the invention has for this purpose an elastic limit Rp0.2 > 350 MPa, an elongation at break A80 of ≥ 35% and a tensile strength Rm of ≥ 800 MPa, a stacking fault energy of 7-15 mJ/m2 and a structure which has a grain size of ≥ ASTM 13 and a carbide density per unit area of ≤ 250 carbide particles per 1000 µm2 and consists of a steel containing (in wt%) C: 0.1-0.8%, Mn: 10-25%, Al: 0.3-2%, one or more elements from the group "V, Nb, Ti" with the proviso that the sum of "V, Nb, Ti" is 0.01-0.5%, Si: up to 0.5%, Cr: < 1.5%, S: < 0.03%, P: < 0.08%, N: < 0.1%, Mo: < 2%, Co: ≤ 0.5%, B: < 0.01%, Ni: < 8%, Cu: < 5%, Ca:≤ 0.015%, Mg: ≤ 0.0015%, Sb: ≤ 0.2%, Sn: up to 0.2%, one or more elements from the group "Zr, Ta, W" with the proviso that the sum of the contents of Zr, Ta and W is ≤ 2%, rare earth metals: ≤ 0.2%, remainder iron and unavoidable impurities. The invention also relates to a method for producing such a cold-rolled flat steel product.
IPC 8 full level
C22C 38/02 (2006.01); C21D 1/76 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C21D 9/663 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/32 (2006.01); C22C 38/40 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
C21D 1/76 (2013.01 - KR); C21D 6/00 (2013.01 - KR); C21D 6/005 (2013.01 - EP); C21D 8/02 (2013.01 - KR); C21D 8/0236 (2013.01 - EP); C21D 8/0273 (2013.01 - EP); C21D 9/46 (2013.01 - KR); C21D 9/663 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/10 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/16 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/40 (2013.01 - EP); C22C 38/42 (2013.01 - KR); C22C 38/46 (2013.01 - EP KR); C22C 38/48 (2013.01 - EP KR); C22C 38/50 (2013.01 - EP KR); C22C 38/54 (2013.01 - EP KR); C22C 38/58 (2013.01 - EP KR); C21D 1/76 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C21D 2201/02 (2013.01 - EP); C21D 2211/001 (2013.01 - EP); C21D 2211/004 (2013.01 - EP); C22C 38/001 (2013.01 - EP)
Citation (search report)
See references of WO 2018188766A1
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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2018188766 A1 20181018; CN 110709528 A 20200117; EP 3610049 A1 20200219; KR 20190138835 A 20191216
DOCDB simple family (application)
EP 2017068405 W 20170720; CN 201780090666 A 20170720; EP 17743317 A 20170720; KR 20197033058 A 20170720