EP 2240619 B1 20170125 - CREEP RESISTANT STEEL
Title (en)
CREEP RESISTANT STEEL
Title (de)
KRIECHFESTER STAHL
Title (fr)
ACIER RÉSISTANT AU FLUAGE
Publication
Application
Priority
- EP 2008053004 W 20080313
- CH 5062007 A 20070329
Abstract (en)
[origin: WO2008119638A1] The invention relates to a creep resistant steel which is characterized by the following chemical composition (given in % by weight): 9.0 to 12.0 Cr, 0.1 to 0.5 Mn, 2.3 to 3 Ni, 1.5 to 2.0 Mo, 0.1 to 0.4 V, 0.01 to 0.06 Nb, 0.08 to 0.16 C, 0.02 to 0.08 N, 0.004 to 0.012 B, 0.001 to 2 Ta, 0.001 to 0.5 La, 0.0001 to 1 Pd, maximum 0.005 P, maximum 0.005 S, maximum 0.05 Si, maximum 0.005 Sn, and the balance iron and unavoidable impurities. This steel distinguishes itself from other commercial steels by a much improved creeping behavior at temperatures of 550°C and higher. The steel also has an improved resistance to embrittlement after long-term aging, and a comparatively high tensile strength. The steel can be advantageously utilized as a material for gas turbine rotors which is exposed to high entrance temperatures for the purpose of increasing efficiency of the gas turbine, but can also be utilized in steam turbines.
IPC 8 full level
C22C 38/48 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP US)
C22C 38/001 (2013.01 - EP US); C22C 38/005 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008119638 A1 20081009; CN 101743336 A 20100616; CN 101743336 B 20111214; EP 2240619 A1 20101020; EP 2240619 B1 20170125; JP 2010522825 A 20100708; JP 5256279 B2 20130807; US 2010040502 A1 20100218; US 8147748 B2 20120403
DOCDB simple family (application)
EP 2008053004 W 20080313; CN 200880010457 A 20080313; EP 08717748 A 20080313; JP 2010500188 A 20080313; US 56505109 A 20090923