EP 4168597 A1 20230426 - METHOD FOR PRODUCING A SHEET STEEL PRODUCT, SHEET STEEL PRODUCT, AND USE OF SUCH A SHEET STEEL PRODUCT
Title (en)
METHOD FOR PRODUCING A SHEET STEEL PRODUCT, SHEET STEEL PRODUCT, AND USE OF SUCH A SHEET STEEL PRODUCT
Title (de)
VERFAHREN ZUM HERSTELLEN EINES STAHLFLACHPRODUKTS, STAHLFLACHPRODUKT UND VERWENDUNG EINES SOLCHEN STAHLFLACHPRODUKTS
Title (fr)
PROCÉDÉ DE PRODUCTION D'UN PRODUIT EN TÔLE, PRODUIT EN TÔLE ET UTILISATION D'UN TEL PRODUIT EN TÔLE
Publication
Application
Priority
EP 2020066798 W 20200617
Abstract (en)
[origin: WO2021254610A1] According to the invention, to produce sheet steel products which are suitable for forming into sheet metal parts and can be welded well, a) a steel melt is melted, which consists of, in wt%, C: 0.10-0.4, Si: 0.05-0.5, Mn: 0.5-3.0, AI: 0.01-0.2, Cr: 0.005-1.0, V: 0.001-0.2, and optionally one or more elements from the group "B, Ti, Nb, Ni, Cu, Mo, W" in the following amounts, B: 0.0005-0.01, Ti: 0.001-0.1, Nb: 0.001-0.1, Ni: 0.01-0.4, Cu: 0.01-0.8, Mo: 0.002-1.0, W: 0.001-1.0, the remainder Fe and unavoidable impurities. The melt is b) poured into a tundish, out of which the melt flows into a continuous casting mould to form a strand, wherein, when poured into the tundish, the melt has a superheat temperature TUE which is 5-60°C higher than the liquidus temperature thereof, and the following applies for the product a formed from a thickness Ds of the strand and a pouring speed Vs at which the melt flows into the continuous casting mould: amin < a < amax (where amin - 0.05 m2/min, amax - 0.7 m2/min, Ds: 20-500 mm). c) A slab or thin slab is separated off from the strand and is then d) heated through at a temperature of 1100-1400°C. The heated slab or thin slab is hot-rolled to form a sheet steel product at a final rolling temperature of 750-1000°C. Following any optional reeling, descaling and cold-rolling, the sheet steel product is annealed at an annealing temperature of 650-900°C. It is then cooled to room temperature, the cooling taking place from 600°C to 450°C at an average cooling rate (CR1) ≤ 25 K/s and from 400°C to 220°C at an average cooling rate (CR2) ≤ 20 K/s. The invention also relates to a sheet steel product having an optimal property profile for forming.
IPC 8 full level
B22D 11/00 (2006.01); B22D 11/041 (2006.01); C21D 6/00 (2006.01); C21D 7/13 (2006.01); C21D 8/04 (2006.01); C21D 9/48 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/40 (2006.01); C23C 30/00 (2006.01)
CPC (source: EP)
B22D 11/003 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 7/13 (2013.01); C21D 9/48 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/24 (2013.01); C22C 38/38 (2013.01); C23C 30/00 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 8/0426 (2013.01); C21D 8/0436 (2013.01); C21D 8/0447 (2013.01); C21D 8/0463 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/40 (2013.01)
Citation (search report)
See references of WO 2021254610A1
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
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 2020066798 W 20200617; EP 20733610 A 20200617