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It is known from field experience that gas turbine vane fixing bolts, made from high-alloy chromium steel, got stuck in their mating bores and often caused problems upon disassembly. Many of them had to be drilled out rather than removed normally. Several metallurgical in­vestigations determined excessive surface oxidation to be the physical cause for the seizing of the bolts. It was recom­mended to change the bolt material from high-alloy steel to a nickel base superalloy with significantly higher oxidation resistance than steel in order to prevent surface scaling and seizure.

Seizing of Gas Turbine Vane Fixing Bolts Made of X22CrMoV12–1