Abstract: A method for the surface treatment of ferritic/martensitic 9-12% Cr steels for the purpose of achieving an improved oxidation behavior and increased resistance to solid particle erosion at application temperatures of above 500° C., in particular around 650° C., in steam includes, in a first step, a known shot peening of the surface of the steel with steel particles, and, subsequently, in a second step, shot peening with glass particles, optionally, in a following third step, the surface of the steel being smoothed. A subsequent additional heat treatment is unnecessary.

Abstract: A method for the surface treatment of ferritic/martensitic 9-12% Cr steels and of austenitic Cr steels for the purpose of achieving increased resistance to oxidation and solid particle erosion at application temperatures of above 500° C., in particular of approximately 650° C., in steam, includes that the surface of the steel is shot-peened with particles of aluminum or of an aluminum alloy; optionally, in a subsequent step, the surface of the steel is smoothed to a roughness of <0.5 ?m, preferably <0.3 ?m. Following additional heat treatment is not necessary, and the parts thus treated may be employed, for example, as blades in steam turbines.

Abstract: A method for the surface treatment of ferritic/martensitic 9-12% Cr steels for the purpose of achieving an improved oxidation behavior and increased resistance to solid particle erosion at application temperatures of above 500° C., in particular around 650° C., in steam includes, in a first step, a known shot peening of the surface of the steel with steel particles, and, subsequently, in a second step, shot peening with glass particles, optionally, in a following third step, the surface of the steel being smoothed. A subsequent additional heat treatment is unnecessary.