EP 3963114 A1 20220309 - PROCESS FOR PRODUCING BATCH ANNEALED TAILOR ROLLED STRIP
Title (en)
PROCESS FOR PRODUCING BATCH ANNEALED TAILOR ROLLED STRIP
Title (de)
VERFAHREN ZUR HERSTELLUNG MITTELS HAUBENGLÜHEN EINES MASSGESCHNEIDERTEN WALZBANDS
Title (fr)
PROCÉDÉ DE PRODUCTION D'UNE BANDE LAMINÉE SUR MESURE À RECUIT DISCONTINU
Publication
Application
Priority
- EP 19171939 A 20190430
- EP 2020061108 W 20200421
Abstract (en)
[origin: WO2020221628A1] The invention relates to a process for producing batch annealed tailor rolled steel strip is provided, comprising the following steps: a) casting a slab having a composition of (in wt%): C = 0 – 0.2; Mn = 2.0 – 4.0; Si ≤ 1.0; P = 0.001 – 0.05: S = 0.001 – 0.01; N ≤ 0.02; Al = 0.01 – 0.10; optionally: Ti ≤ 0.04; Nb ≤ 0.04; V ≤ 0.20; Mo ≤ 0.10; B ≤ 0.005; Cr ≤ 1.0; Ca ≤ 0.005, wherein Ti + Nb ≤ 0.05, wherein V + Mo ≤ 0.15, and wherein 2.0 ≤ Cr + Mn ≤ 4.0, the remainder being Fe and unavoidable impurities b) hot rolling the slab to a finish rolling temperature between 910 and 1100 °C c) cooling the hot rolled strip to a coiling temperature between 200 and 700 °C d) cold rolling the hot rolled strip with a reduction of at least 30% using differential rolling to produce different thicknesses within the strip, so as to produce a tailor rolled steel strip, to be cut into tailor rolled blanks e) batch annealing the differential cold rolled strip at a temperature between 650 °C and the Ac3 temperature of the strip, to obtain a batch annealed tailor rolled steel strip having a Rm of at least 570 MPa.
IPC 8 full level
B21B 37/26 (2006.01); C21D 8/02 (2006.01); C22C 38/04 (2006.01)
CPC (source: EP)
C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C21D 1/673 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01)
Citation (search report)
See references of WO 2020221628A1
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)
DOCDB simple family (application)
EP 2020061108 W 20200421; EP 20719642 A 20200421