EP 1942203 A1 20080709 - STEEL PRODUCT USABLE AT LOW TEMPERATURE AND METHOD FOR PRODUCTION THEREOF
Title (en)
STEEL PRODUCT USABLE AT LOW TEMPERATURE AND METHOD FOR PRODUCTION THEREOF
Title (de)
BEI NIEDRIGER TEMPERATUR VERWENDBARES STAHLPRODUKT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
PRODUIT DE TYPE ACIER UTILISABLE À BASSE TEMPÉRATURE ET PROCÉDÉ POUR LA PRODUCTION DE CELUI-CI
Publication
Application
Priority
- JP 2006300339 W 20060113
- JP 2005274222 A 20050921
Abstract (en)
Provided are a steel product having a Ni content less than the 9% Ni steel and exhibiting equivalent properties to those of the 9% Ni steel; and a method for producing the said steel product. The above steel product is a steel product usable at a low temperature, characterized in that it has a chemical composition, by mass percent, of C: 0.01 to 0.1%, Si: 0.005 to 0.6%, Mn: 0.3 to 2%, Ni: more than 6% to less than 8%, sol.Al: 0.005 to 0.05%, N: 0.0005 to 0.005% and the balance: Fe and impurities, with the proviso that the following formula (1): 20C + 2.4Mn + Ni ‰¥ 10 ····· (1), is satisfied; it contains austenite of 1.7% or more in area ratio or it further contains cementite. The said austenite has an aspect ratio of 3.5 or less in average and an average circle-equivalent grain diameter of 1.0 µm or less and /or the said cementite has an aspect ratio of 5.0 or less in average and an average circle-equivalent diameter of 0.6 µm or less. The steel product may further contain one or more selected from among Mo, Cu, Cr, V, Nb, Ti, B, Ca and Mg.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/25 (2006.01); C21D 6/00 (2006.01); C21D 7/13 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01)
CPC (source: EP KR)
C21D 1/25 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/02 (2013.01 - EP KR); C22C 38/001 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/08 (2013.01 - EP KR); C21D 2211/001 (2013.01 - EP); C21D 2211/003 (2013.01 - EP)
Designated contracting state (EPC)
BE DE FR
DOCDB simple family (publication)
EP 1942203 A1 20080709; EP 1942203 A4 20121226; EP 1942203 B1 20140813; EP 1942203 B9 20150304; JP 4872917 B2 20120208; JP WO2007034576 A1 20090319; KR 100984413 B1 20100929; KR 20080038226 A 20080502; WO 2007034576 A1 20070329
DOCDB simple family (application)
EP 06702620 A 20060113; JP 2006300339 W 20060113; JP 2007536391 A 20060113; KR 20087006436 A 20060113