EP 1984527 A2 20081029 - METHOD OF PRODUCTION OF HIGH-STRENGTH LOW-ALLOYED STEEL PIPES
Title (en)
METHOD OF PRODUCTION OF HIGH-STRENGTH LOW-ALLOYED STEEL PIPES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ROHREN AUS NIEDRIG LEGIERTEM STAHL MIT HOHER FESTIGKEIT
Title (fr)
PROCEDE DE PRODUCTION DE CONDUITES EN ACIER FAIBLEMENT ALLIE A HAUTE RESISTANCE
Publication
Application
Priority
- CZ 2006000086 W 20061206
- CZ 2005756 A 20051206
Abstract (en)
[origin: WO2007065380A2] A method of production of high-strength low-alloyed steel pipes including a thermomechanical treatment and/or an intercritical heat treatment, where the pipes are produced first by hot rolling or hot extrusion, upon which follows a cooling process and, finally, drawing and/or forming with internal pressure and/or bending of pipes. The thermomechanical treatment process includes hot rolling or hot extrusion with finish forming temperature between 600 and l,000°C and subsequent controlled cooling with delay of maximum 50 sec in the temperature range of 700 to 4500C and the delay of at least 120 sec in the temperature range of 450 to 350°C. The hot rolling or hot extrusion process is followed by the following sequence: a cooling process, intercritical heat treatment with the maximum temperature between 770 and 850°C; upon soaking at this temperature, there is controlled cooling with the delay of max. 50 sec in the temperature range of 700 to 450°C and a delay of at least 120 sec in the temperature range of 450 to 350°C.
IPC 8 full level
C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 9/08 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01)
CPC (source: EP)
C22C 38/02 (2013.01); C22C 38/04 (2013.01)
Citation (search report)
See references of WO 2007065380A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2007065380 A2 20070614; WO 2007065380 A3 20080821; CZ 2005756 A3 20070613; CZ 299495 B6 20080813; EP 1984527 A2 20081029; EP 1984527 B1 20131106
DOCDB simple family (application)
CZ 2006000086 W 20061206; CZ 2005756 A 20051206; EP 06818001 A 20061206