Global Patent Index - EP 1637615 B1

EP 1637615 B1 20140716 - Heat-resisting steel, heat treatment method for heat-resisting steel and high-temperature steam turbine rotor

Title (en)

Heat-resisting steel, heat treatment method for heat-resisting steel and high-temperature steam turbine rotor

Title (de)

Wärmebeständiger Stahl, Wärmebehandlungmethode für wärmebeständigen Stahl und Hochtemperaturdampfturbinenrotor

Title (fr)

Acier résistant à la chaleur, méthode de traitement thermique pour l'acier résistant à la chaleur et rotor à hautes températures de turbine à vapeur

Publication

EP 1637615 B1 20140716 (EN)

Application

EP 05019872 A 20050913

Priority

JP 2004269947 A 20040916

Abstract (en)

[origin: EP1637615A1] A heat-resisting steel consisting of, in percentage by weight, 0.25 to 0.35 of C, 0.15 or less of Si, 0.2 to 0.8 of Mn, 0.3 to 0.6 of Ni, 1.6 to 1.9 of Cr, 0.26 to 0.35 of V, 0.6 to 0.9 of Mo, 0.9 to 1.4 of W, less than 0.01 of Ti, 0.001 to 0.007 of N, 1.3 to 1.4 of a total of Mo and W/2 and the balance of Fe and inevitable impurities, wherein the heat-resisting steel consists of a bainite single phase structure securing 3.5 or more of a total amount of precipitates as 1.0 or more of Fe, 0.8 to 0.9 of Cr, 0. 4 to 0. 5 of Mo, 0. 3 to 0.5 of W and 0.2 or more of V in percentage by weight are moved into the precipitates after a tempering heat treatment.

IPC 8 full level

C21D 9/36 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01)

CPC (source: EP US)

C21D 9/36 (2013.01 - EP US)

Designated contracting state (EPC)

CH DE FR IT LI

DOCDB simple family (publication)

EP 1637615 A1 20060322; EP 1637615 B1 20140716; CN 100376708 C 20080326; CN 1749427 A 20060322; JP 2006083432 A 20060330; JP 4266194 B2 20090520; US 2006054254 A1 20060316

DOCDB simple family (application)

EP 05019872 A 20050913; CN 200510109688 A 20050916; JP 2004269947 A 20040916; US 21865905 A 20050906