Low pressure section steam turbine bucket

A steam turbine comprising a low pressure turbine section, said low pressure turbine section comprising:

• a plurality of last stage buckets arranged about a turbine wheel, said plurality of last stage buckets having a vane length of about 45 inches or greater, at least one last stage bucket comprising;
• a dovetail section disposed near an inner radial position of said at least one last stage bucket;
• a tip shroud disposed near an outer radial position of said at least one last stage bucket;
• a part span shroud disposed at an intermediate radial position, said intermediate radial position located between said inner and outer radial positions;
• and
• wherein each of said plurality of last stage buckets are comprised of a titanium-based alloy having between about 2% and about 6.25% by weight aluminum, up to about 3.5% vanadium, up to about 2.25% tin, up to about 2.25% zirconium, between about 1.75% and about 5.0% molybdenum, up to about 2.25% chromium, up to about 0.7% silicon and up to about 2.3% iron, with the balance being titanium.