On Tue, 17 Jan 2012 10:32:00 -0600, Ignoramus23559
A lot of steam turbines are high cobalt alloys, with titanium, nickel,
tungsten, Molybdenum, etc - stuff with names like Nimonic 105, Udimet
720, Haynes 282, etc. Pretty esoteric stuff. Lesser stuff like
Hastelloy and Iconel are also used, depending on how hot and high
pressure the steam is.
Depends markedly on what were the operating conditions of the particular
turbine and the age (and the two are correlated to some extent; there
weren't any supercritical units before the late 50s or so to speak of).
The higher pressure/temperature, the more demanding the conditions and
the more "exotic" the materials. I'd guess that's from the low-pressure
section in the picture, but "low" is still relative depending on the
You're best source for the turbine in question if you're serious will be
to ask the folks holding the auction (assuming that's what's going on here).
So maybe running at a maximum steam temperature of about 650 C? The
following is from a 1971 UK reference, so could be right for recently
The usual HP and IP rotor materials were ferritic steels (chrome moly
vanadium)which are good for 540 C, with 3% Cr-Mo or 2 1/4% nickel chrome
moly for the LP.
Most blading was 12% Chrome moly vanadium steel for strength and creep.
The high temperature blades would contain Niobium for improved creep.
Nimonics were also used (expensive). LP blading was also 12% chrome moly
vanadium, but heat treated for high strength (because these blades are
longer and wider). Titanium was used for lacing wires.
On Thu, 19 Jan 2012 15:06:32 -0600, Ignoramus19378
The old steam turbine blades I saw in the Carlsbad, CA Encina Power
Plant 30ish years ago were something like 30' in diameter. They were
fossil, too. (fuel oil powered) The thing was down for PM. The guy
said they'd rather take them down early than wait until it threw a fin
through the casing after a bearing took its final spin.
I have the consolation of having added nothing to my private fortune during
my public service, and of retiring with hands clean as they are empty.
-- Thomas Jefferson, letter to Count Diodati, 1807
FWIW, I saw some turbines from a nuclear power plant (Pilgrim?) in a
scrapyard once. All the blades had been broken off. The owner didn't know
which valuable alloy they were, but it wasn't the same as the rotors.
Some years back, we went the Seattle International Raceway for a special
chevrolet day drag race event. Someone had a turbo jet powered dragster
there as part of the show. After a bunch of smoke events and short leaps
down the raceway, got back to the starting lights and did a real run for
the 1/4 mile. Sure didn't take long to get to the end. Quite a show!
Never been back as they raised the ticket price.
I've been wondering this for a while.
Just out of curiosity -- given your pseudo-username above, why
did you miss out on using the fourth rotation/reversal of the same
letter, 'q'? That one is your 'b' rotated 180 degrees, or your 'p'
flipped left for right. (Just as your 'd' relates to the other two, 180
degree rotation or flipped left for right. :-)
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