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HIGH STRENGTH STEAM TURBINE ROTOR, AND METHOD FOR MANUFACTURING THE ROTOR WITHOUT INCREASING STRESS CORROSION CRACKING
HIGH STRENGTH STEAM TURBINE ROTOR, AND METHOD FOR MANUFACTURING THE ROTOR WITHOUT INCREASING STRESS CORROSION CRACKING
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机译:高强度汽轮机转子以及在不增加应力腐蚀裂纹的情况下制造转子的方法
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摘要
PROBLEM TO BE SOLVED: To provide a heat treatment method for manufacturing a monoblock, low alloy steel rotor for a low pressure steam turbine.;SOLUTION: In this heat treatment method, the rotor is austenitized at a substantially uniform treatment temperature of about 840°C, the rotor is hardened, and differentially tempered at different locations in the axial direction of the rotor. The rotor is tempered in a furnace divided into a plurality of regions by refractory boards so as to maintain different temperatures in respective regions. By lowering the tempering temperature at one or more locations in the axial direction, a condition higher than normal strength is achieved. The one or more axial locations tempered at lower temperature is close to a location less susceptible to stress corrosion cracking, and the strength of the rotor can be increased without increasing net susceptibility to stress corrosion cracking.;COPYRIGHT: (C)2002,JPO
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