EP 3853385 A1 20210728 - METHOD OF PRODUCING ULTRAHIGH-STRENGTH STEEL SHEETS AND STEEL SHEET THEREFOR
Title (en)
METHOD OF PRODUCING ULTRAHIGH-STRENGTH STEEL SHEETS AND STEEL SHEET THEREFOR
Title (de)
VERFAHREN ZUR HERSTELLUNG ULTRAHOCHFESTER STAHLBLECHE UND STAHLBLECH HIERFÜR
Title (fr)
PROCÉDÉ DE FABRICATION DE TÔLES EN ACIER ULTRARÉSISTANTES ET TÔLE EN ACIER CORRESPONDANTE
Publication
Application
Priority
- DE 102018122901 A 20180918
- EP 2019074815 W 20190917
Abstract (en)
[origin: WO2020058244A1] The invention relates to a process for producing an ultrahigh-strength, hot-rolled construction steel, wherein a steel having a carbon content not greater than 0.2% is produced, wherein diffusive transformation of the austenite is avoided by achieving sufficient retardation of transformation by the addition of manganese, chromium and boron, and wherein the steel material is cast in a known manner and the cast material is subjected to an increase in temperature for the purpose of hot rolling, wherein the strip after the rolling process is immediately and directly hardened, wherein the martensite microstructure forms from the deformed austenite and the material thus generated is then mechanically straightened in order to provide mobile dislocations, wherein the material is then annealed to establish the desired yield point while simultaneously keeping the tensile strength, toughness and forming properties present after the direct hardening, wherein the annealing temperature is between 100 and 200°C.
IPC 8 full level
C21D 1/18 (2006.01); C21D 1/22 (2006.01); C21D 8/02 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01)
CPC (source: EP KR US)
C21D 1/18 (2013.01 - EP KR US); C21D 1/22 (2013.01 - EP KR); C21D 6/004 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/0205 (2013.01 - US); C21D 8/0226 (2013.01 - EP KR US); C21D 8/0242 (2013.01 - EP KR); C21D 8/0263 (2013.01 - EP KR US); C21D 9/52 (2013.01 - US); C22C 38/001 (2013.01 - US); C22C 38/002 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - US); C22C 38/26 (2013.01 - EP KR); C22C 38/28 (2013.01 - EP KR); C22C 38/32 (2013.01 - EP KR); C22C 38/38 (2013.01 - EP KR); C22C 38/44 (2013.01 - US); C22C 38/46 (2013.01 - US); C22C 38/48 (2013.01 - US); C22C 38/50 (2013.01 - US); C22C 38/54 (2013.01 - US); C22C 38/58 (2013.01 - US); C21D 2211/001 (2013.01 - US); C21D 2211/008 (2013.01 - EP KR US)
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)
DE 102018122901 A1 20200319; CN 112714798 A 20210427; CN 112714798 B 20231020; EP 3853385 A1 20210728; KR 20210062003 A 20210528; US 11970753 B2 20240430; US 2021317544 A1 20211014; WO 2020058244 A1 20200326
DOCDB simple family (application)
DE 102018122901 A 20180918; CN 201980061231 A 20190917; EP 19772687 A 20190917; EP 2019074815 W 20190917; KR 20217007162 A 20190917; US 201917276280 A 20190917