Gas turbine nozzle

A gas turbine nozzle made of a cast material having a chemical composition which consists essentially of 0.2 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum, 0.1 to 2 wt% of a carbide former for forming MC type carbides and the remainder nickel, said material having a heat-treated structure in which eutectic carbides and secondary carbides are dispersed in the matrix.

A gas turbine nozzle made of a cast material having a chemical composition which consists essentially of 0.2 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum, 0.05 to 2 wt% of at least one of yttrium and aluminum and the remainder nickel, said material having a heat-treated structure in which eutectic carbides and secondary carbides are dispersed in the matrix.

A gas turbine nozzle made of a cast material having a chemical composition which consists essentially of 0.2 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum, 0.1 to 2 wt% of carbide former for forming MC type carbides, 0.05 to 2 wt% of at least one of yttrium and aluminum and the remainder nickel, said material having a heat-treated structure in which eutectic carbides and secondary carbides are dispersed in the matrix.

A gas turbine nozzle made of a cast material having a chemical composition which consists essentially of 0.1 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum, 5 to 15 wt% cobalt and the remainder nickel, said material having a heat-treated structure in which eutectic carbides and secondary carbides are dispersed in the matrix.

A gas turbine nozzle made of a cast material having a chemical composition which consists essentially of 0.1 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum, 0.1 to 2 wt% of a carbide former for forming MC type carbides, 5 to 15 wt% cobalt and the remainder nickel, said material having a heat-treated structure in which eutectic carbides and secondary carbides are dispersed in the matrix.

A gas turbine nozzle made of a cast material having a chemical composition which consists essentially of 0.1 to 1 wt% carbon, 0.1 to 2 wt% silicon, 0.1 to 2 wt% manganese, 20 to 40 wt% chromium, 0.001 to 0.1 wt% boron, 5 to 20 wt% of at least one of tungsten and molybdenum, 0.1 to 2 wt% of carbide former for forming MC type carbides, 0.05 to 2 wt% of at least one of yttrium and aluminum, 5 to 15 wt% cobalt and the remainder nickel, said material having a heat-treated structure in which eutectic carbides and secondary carbides are dispersed in the matrix.