EP 1988182 A4 20131016 - FERRITIC HEAT-RESISTANT STEEL
Title (en)
FERRITIC HEAT-RESISTANT STEEL
Title (de)
FERRITISCHER HITZEBESTÄNDIGER STAHL
Title (fr)
ACIER REFRACTAIRE A BASE DE FERRITE
Publication
Application
Priority
- JP 2007051968 W 20070206
- JP 2006029009 A 20060206
Abstract (en)
[origin: EP1988182A1] Disclosed is a ferritic heat-resistant steel which has the following chemical composition (by weight) : C: 0.01-0.10%; Si: 0.30-1.0%; P: 0.02 or less; S: 0.010% or less; Mn: 0.2-1.2%; Ni: 0.3% or less; Cr: 8.0-11.0%; Mo: 0.1-1.2%; W: 1.0-2.5%; V: 0.10-0.30%; Nb: 0.02-0.12%; Co: 0.01-4.0%; N: 0.01-0.08%; B: not less than 0.001% and less than 0.010%; Cu: 0.3% or less; and Al: 0.010% or less, provided that the chemical composition satisfies the following equations: Mo (%) + 0.5xW(%) = 1.0-1.6, and C(%) + N(%) = 0.02-0.15%, and which comprises a tempered martensite single-phase tissue produced by thermal refining. The steel shows an excellent long-term creep rupture strength even when used at a steam temperature around 650˚C and also has excellent steam oxidizability. When the value represented by the equation: Al(%) + 0.1xNi(%) is adjusted to 0.02 or less, the creep strength can be more stabilized.
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP US)
C21D 8/105 (2013.01 - EP US); C21D 9/08 (2013.01 - EP US); C21D 9/085 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/30 (2013.01 - EP US); C22C 38/42 (2013.01 - US); C22C 38/44 (2013.01 - US); C22C 38/46 (2013.01 - US); C22C 38/48 (2013.01 - US); C22C 38/52 (2013.01 - US); C22C 38/54 (2013.01 - US); F22B 37/04 (2013.01 - EP US); F22B 37/10 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [XD] JP 2005023378 A 20050127 - BABCOCK HITACHI KK
- [I] EP 1621643 A1 20060201 - NAT INST FOR MATERIALS SCIENCE [JP], et al
- [AP] EP 1681359 A1 20060719 - NAT INST FOR MATERIALS SCIENCE [JP]
- [A] JP H07286247 A 19951031 - NIPPON STEEL CORP, et al
- [A] US 2905577 A 19590922 - HARRIS GEOFFREY T, et al
- [A] BANDENBERGHE B ET AL: "DEVELOPMENT OF A NEW 12 % CR STEEL FOR TUBES AND PIPES IN POWER PLANTS WITH STEAM TEMPERATURES UP TO 650 DEG C//DEVELOPPEMENT D'UN NOUVEL ACIER A 12 % CR POUR TUBES POUR UTILISATION JUSQU'A DES TEMPERATURES DE VAPEUR DE 650 DEG C DANS LES CENTRALES THERMIQUES", REVUE DE METALLURGIE - CAHIERS D'INFORMATIONS TECHNIQUES, REVUE DE METALLURGIE. PARIS, FR, vol. 102, no. 3, 1 March 2005 (2005-03-01), pages 263 - 268, XP001230944, ISSN: 0035-1563, DOI: 10.1051/METAL:2005127
- See references of WO 2007091535A1
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 NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1988182 A1 20081105; EP 1988182 A4 20131016; JP 2013064199 A 20130411; JP 5283908 B2 20130904; JP 5501434 B2 20140521; JP WO2007091535 A1 20090702; US 2009007991 A1 20090108; US 2011017355 A1 20110127; US 2013294959 A1 20131107; WO 2007091535 A1 20070816
DOCDB simple family (application)
EP 07708086 A 20070206; JP 2007051968 W 20070206; JP 2007557837 A 20070206; JP 2012255868 A 20121122; US 201313931197 A 20130628; US 27830607 A 20070206; US 90122110 A 20101008