EP 2096186 B1 20121024 - FREE-CUTTING STEEL EXCELLENT IN MANUFACTURABILITY
Title (en)
FREE-CUTTING STEEL EXCELLENT IN MANUFACTURABILITY
Title (de)
AUTOMATENSTAHL MIT HERVORRAGENDER FERTIGUNGSFREUNDLICHKEIT
Title (fr)
ACIER DE DÉCOLLETAGE AVEC UNE EXCELLENTE APTITUDE À LA FABRICATION
Publication
Application
Priority
- JP 2007073277 W 20071127
- JP 2006319895 A 20061128
Abstract (en)
[origin: EP2096186A1] The present invention provides machining steel superior in machinability, accompanied with little melt loss of plate refractories of continuous casting sliding nozzles, and superior in ductility in hot rolling and able to prevent deterioration of the surface properties due to hot rolling, containing, by mass%, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.3 to 3.0%, P: 0.001 to 0.2%, S: 0.30 to 0.60%, B: 0.0003 to 0.015%, O: 0.005 to 0.012%, Ca: 0.0001 to 0.0010%, and Al‰¤0.01%, having an N content satisfying N‰¥0.0020% and 1.3×B-0.0100‰¤N‰¤1.3×B+0.003, and having a balance of Fe and unavoidable impurities, wherein, regarding the MnO in the steel, in a cross-section of the steel material perpendicular to the rolling direction, the area of MnO of a circle equivalent diameter of 0.5 µm or more being 15% or less of the area of the total Mn-based inclusions.
IPC 8 full level
C22C 38/00 (2006.01); C21D 6/00 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C21D 6/005 (2013.01 - EP KR US); C22C 38/001 (2013.01 - EP KR US); C22C 38/002 (2013.01 - EP KR US); C22C 38/004 (2013.01 - EP KR US); C22C 38/008 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/60 (2013.01 - EP KR US)
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 MT NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2096186 A1 20090902; EP 2096186 A4 20110713; EP 2096186 B1 20121024; AU 2007326255 A1 20080605; AU 2007326255 B2 20100624; BR PI0719310 A2 20140715; BR PI0719310 B1 20180123; CN 101573463 A 20091104; JP 5212111 B2 20130619; JP WO2008066194 A1 20100311; KR 101118852 B1 20120316; KR 20090055648 A 20090602; TW 200840875 A 20081016; TW I363804 B 20120511; US 2010054984 A1 20100304; WO 2008066194 A1 20080605
DOCDB simple family (application)
EP 07849980 A 20071127; AU 2007326255 A 20071127; BR PI0719310 A 20071127; CN 200780038284 A 20071127; JP 2007073277 W 20071127; JP 2008547071 A 20071127; KR 20097008173 A 20071127; TW 96144929 A 20071127; US 31256707 A 20071127