STEAM TURBINE LOW-PRESSURE ROTOR AND STEAM TURBINE LOW-PRESSURE ROTOR MANUFACTURING METHOD

Japanese Patent JP2015117625

A

PROBLEM TO BE SOLVED: To provide a steam turbine low-pressure rotor exhibiting strength, toughness, and corrosion resistance in excellent balance.SOLUTION: The present invention relates to a steam turbine low-pressure rotor including: a low-pressure-side final-stage disc containing precipitation hardening martensitic stainless steel comprising ≤0.1 mass% of C, ≤0.5 mass% of Si, 0.1 to 1 mass% of Mn, 7 to 10 mass% of Ni, 12 to 18 mass% of Cr, 2 to 3 mass% of Mo, 0.5 to 2.5 mass% of Ti, 0.5 to 2.5 mass% of Al, and the balance Fe with inevitable impurities with respect to the total mass; and a high-pressure-side disc containing 3.5% of Ni steel and arranged adjacent to the low-pressure-side final-stage disc, and manufactured by a method including: a step of welding the low-pressure-side final-stage disc to the high-pressure-side disc; and a step of performing heat treatment at 570 to 650°C on a welded member obtained by the welding step and including the low-pressure-side final-stage disc and the high-pressure-side disc.

HARUYAMA HIROSHI
KONNO SHINYA
OIKAWA SHINJI
ARAI MASAHIKO
DOI HIROYUKI

JP2013261570A

June 25, 2015

December 18, 2013

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MITSUBISHI HITACHI POWER SYS

F01D5/06; B23K9/00; B23K31/00; C21D9/00; C22C38/00; C22C38/50; F01D25/00

JP2010031812A	2010-02-12
JP2013209742A	2013-10-10
JP2009520603A	2009-05-28
JP2009144650A	2009-07-02
JP2001123801A	2001-05-08
JP2001098351A	2001-04-10
JP2013001949A	2013-01-07
JPH07118734A	1995-05-09

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