EP 1873270 A1 20080102 - LOW ALLOY STEEL
Title (en)
LOW ALLOY STEEL
Title (de)
NIEDRIG LEGIERTER STAHL
Title (fr)
ACIER FAIBLEMENT ALLIÉ
Publication
Application
Priority
- JP 2006308018 W 20060417
- JP 2005120239 A 20050418
Abstract (en)
A low alloy steel for a heat-resisting structural member being improved in long time creep ductility at high temperatures and temper softening resistance, characterized by comprising, by mass percent, C: 0.03 to 0.10%, Si: not more than 0.30%, Mn: not more than 1.0%, Cr: more than 1.5% to not more than 2.5%, Mo: 0.01 to 1.0%, V: 0.04 to 0.30%, Nb: 0.001 to 0.10%, Ti: 0.001 to 0.020%, B: 0.0001 to 0.020%, Al: 0.001 to 0.01% and Nd: 0.0001 to 0.050%, with the balance being Fe and impurities, wherein the content of P is not more than 0.020%, the content of S is not more than 0.003%, the content of N is less than 0.0050% and the content of O (oxygen) is not more than 0.0050% among the impurities, in which the value of BSO represented by the following formula (1) is 0.0001 to 0.010: BSO = B - ( 11 / 14 ) N - ( 11 / 32 ) S - ( 11 / 16 ) O wherein each element symbol in the formula (1) represents the content (by mass %) of the element concerned. The steel may further contain one or more element selected from among W, Cu, Ni, Co, Mg, Ca, La, Ce, Y, Sm and Pr.
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/32 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
C22C 38/002 (2013.01 - KR); C22C 38/005 (2013.01 - KR); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/22 (2013.01 - EP KR US); C22C 38/24 (2013.01 - EP KR US); C22C 38/26 (2013.01 - KR); C22C 38/28 (2013.01 - KR); C22C 38/32 (2013.01 - KR)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1873270 A1 20080102; EP 1873270 A4 20091202; EP 1873270 B1 20120530; CA 2604428 A1 20061026; CA 2604428 C 20130716; CN 101163808 A 20080416; JP 4561834 B2 20101013; JP WO2006112428 A1 20081211; KR 100915489 B1 20090903; KR 20070110139 A 20071115; US 2008050265 A1 20080228; WO 2006112428 A1 20061026
DOCDB simple family (application)
EP 06745409 A 20060417; CA 2604428 A 20060417; CN 200680012977 A 20060417; JP 2006308018 W 20060417; JP 2007528134 A 20060417; KR 20077023015 A 20060417; US 90757507 A 20071015