EP 1127951 A1 20010829 - HIGHLY CLEANED STEEL
Title (en)
HIGHLY CLEANED STEEL
Title (de)
HOCHGEREINIGTER STAHL
Title (fr)
ACIER FORTEMENT NETTOYE
Publication
Application
Priority
- JP 0003975 W 20000616
- JP 16947099 A 19990616
Abstract (en)
The present invention provides a super-clean steel excellent in cold workability and fatigue properties even with a reduced use of Ca and Mg ferroalloys, characterized in that, among the non-metallic inclusions with their length (1) and width (d) satisfying the relation 1/d </= 5 at an L section of a rolled steel material, the number of inclusions having the composition A1 specified below accounts for 20% or more, and the total number of inclusions having the composition A1 or B1 specified below accounts for 80% or more, and that, regarding the non-metallic inclusions satisfying the relation 1/d </= 5 and having the composition A1 specified below, d is 40 mu m or less. Composition A1: containing over 60% of SiO2. Composition B1: containing one or both of 50% or less of CaO and 15% or less of MgO, in addition to 20 to 60% of SiO2 and 10 to 80% of MnO.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01)
CPC (source: EP KR)
C22C 38/00 (2013.01 - KR); C22C 38/002 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP)
Citation (search report)
See references of WO 0077270A1
Designated contracting state (EPC)
BE DE FR IT
DOCDB simple family (publication)
EP 1127951 A1 20010829; BR 0006880 A 20010807; CA 2340688 A1 20001221; CN 1313912 A 20010919; KR 20010086358 A 20010910; WO 0077270 A1 20001221
DOCDB simple family (application)
EP 00939092 A 20000616; BR 0006880 A 20000616; CA 2340688 A 20000616; CN 00801137 A 20000616; JP 0003975 W 20000616; KR 20017002034 A 20010216