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Erosion response versus angle of particle incidence has been determined for U710 turbine alloy (Unifited Numbering System [UNS] C71000) and a spinel oxide scale developed over 9200 h on the U710 alloy first stage rotor of a large utility turbine operating with natural gas. The approximately 10:1 pressure ratio and 871°C (1600°F) baseload inlet temperature for this machine are suitable for operation with future coal-fired pressurized fluid bed combustor (PFBC) power plants. Erosion test conditions were representative of the environment in the first rotor of the large utility turbine expanding PFB combustion gases after three stages of cyclone cleaning. The test gas velocities of about 457 m/s (1500 ft/s) and test specimen surface temperature of 766°C (1410°F) approached the maximum values in the first rotor and the particles used for the erosion tests were third cyclone fines collected at a PFBC pilot plant.