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Toshiba Corp
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Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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Application filed by Toshiba Corp, Tokyo Shibaura Electric Co LtdfiledCriticalToshiba Corp
Priority to JP2329681ApriorityCriticalpatent/JPS57137457A/en
Publication of JPS57137457ApublicationCriticalpatent/JPS57137457A/en
PURPOSE: To manufacture a turbine rotor with superior creep rupture strength at high temp. by forging a 12Cr steel ingot obtd. by electroslag remelting and by heat treating the formed rotor.
CONSTITUTION: A 12Cr steel ingot contg. 0.10W0.30% C, 0.20W1.20% Mn, 8W13% Cr, 0.10W0.35% V, 0.5W1.5% Mo, 0.20W1.50% Ni, 0.05W0.80% Ta or Nb and 0.04W0.10% N is converted into a secondary ingot by an electroslag remelting method. This ingot is forged to form a turbine rotor, and the rotor is heat- treated from 1,050°C by cooling →560°C furnace cooling →630°C furnace cooling while simulating the central part of a large-sized rotor. Thus, a turbine rotor with superior creep rupture strength at high temp. is obtd.