EP 0181583 A3 19881117 - METHOD OF MAKING A DUAL-PHASE HOT-ROLLED STEEL STRIP
Title (en)
METHOD OF MAKING A DUAL-PHASE HOT-ROLLED STEEL STRIP
Publication
Application
Priority
DE 3440752 A 19841108
Abstract (en)
[origin: US4790889A] The invention relates to a method of producing hot-rolled strip having a dual-phase structure from a slab previously produced by ingot casting or continuous casting. The slab contains carbon, manganese, silicon and chromium as essential constituents in addition to iron. The slab is heated up to the rolling temperature, hot-rolled at a temperature above Ar3, rapidly cooled from the rolling temperature and coiled at a relative low temperature. The characterizing features of the invention are that the hot-rolled strip (a) is produced from a steel which, in addition to 0.05 to 0.16% of C, 0.5 to 1.0% of Si, 0.3 to 1.5% of Cr, </=0.025% of P, </=0.015% of S, 0.02 to 0.10% of Al and </=0.011% of N, contains 0.2 to 0.4% of Mn, the remainder being iron and usual impurities, (b) is rapidly cooled, immediately after finish-rolling, from final rolling temperature down to the coiling temperature at a mean rate in the range from 30 DEG to 70 DEG C./s and without interruptions, and (c) is then coiled at a temperature in the range from 350 DEG to 190 DEG C.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); B21B 3/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C21D 9/52 (2006.01); C22C 38/14 (2006.01); C22C 38/18 (2006.01)
CPC (source: EP US)
C21D 8/0226 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [AD] EP 0072867 A1 19830302 - KAWASAKI STEEL CO [JP]
- [AD] EP 0019193 B1 19840321
- [AD] EP 0068598 A2 19830105 - KAWASAKI STEEL CO [JP]
- [A] EP 0061503 A1 19821006 - KAWASAKI STEEL CO [JP]
- [A] US 4316753 A 19820223 - KANEKO KUNISHIGE, et al
- [AP] CAHIERS D'INFORMATIONS TECHNIQUES DE LA REVUE DE METALLURGIE, Band 81, Nr. 12, Dezember 1984, Seiten 925-929, Paris, FR; A. TIVOLLE et al.: "Production endustrielle d'acier double-phase directement en sortie de train à bandes"
Designated contracting state (EPC)
AT BE DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0181583 A2 19860521; EP 0181583 A3 19881117; EP 0181583 B1 19910130; AT E60624 T1 19910215; CA 1269256 A 19900522; DE 3440752 A1 19860522; DE 3440752 C2 19870806; DE 3581591 D1 19910307; JP H0676616 B2 19940928; JP S61159535 A 19860719; US 4790889 A 19881213
DOCDB simple family (application)
EP 85113944 A 19851102; AT 85113944 T 19851102; CA 494751 A 19851107; DE 3440752 A 19841108; DE 3581591 T 19851102; JP 24908685 A 19851108; US 5189287 A 19870519