초록 ▼

An improved steam turbine system is provided having a hardfacing disposed on a portion of its steam inlet chamber wear surfaces. The invention also includes a novel stacked ring design having a hardfaced inlet sleeve and stationary, nitride sealing rings for minimizing wear. Also included are novel

An improved steam turbine system is provided having a hardfacing disposed on a portion of its steam inlet chamber wear surfaces. The invention also includes a novel stacked ring design having a hardfaced inlet sleeve and stationary, nitride sealing rings for minimizing wear. Also included are novel heat treatments and metallurgical processes for stress relieving these hardfaced components. The techniques and designs employed, decrease steam leakage and assure longer service life for steam powered turbines.

대표청구항 ▼

A steam turbine system of the kind having an inlet steam nozzle chamber, said chamber having a piston arranged for reciprocal movement therein and a ring member for sealing pressurized steam, said ring member having an inner diameter which engages said piston and an outer diameter disposed in slidin

A steam turbine system of the kind having an inlet steam nozzle chamber, said chamber having a piston arranged for reciprocal movement therein and a ring member for sealing pressurized steam, said ring member having an inner diameter which engages said piston and an outer diameter disposed in sliding contact with an internal wall of said nozzle chamber, said outer diameter of said ring member having a hard surface thereon, wherein said internal wall comprises a hardfacing layer disposed on at least the portion of said internal wall which is in contact with said ring member, said hardfacing layer having a Rc hardness of about 51-58 and a coefficient of thermal expansion which is about that of the nozzle chamber above about 538°C.