This work deals with properties and microstructure of heat resistant chromium steel P92. This steel is considered to be one of the best modified 9-12 % Cr steel for the construction of coal power plants with ultra-super-critical steam parameters. High creep rupture strength of steel P92 is determined by its chemical composition and by microstructure as well. Optimal microstructure of steel P92 is ideally composed of homogeneous martensite and fine dispersion of secondary particles.During the experiments one P92 heat with an occurrence of more than 20 % delta ferrite was produced. The results of this heat are confronted with mechanical and creep properties of another heat without delta ferrite in the microstructure. Conclusions relate to the influence of delta ferrite on mechanical and creep properties of P92 steel.Keywords: Delta ferrite, mechanical properties, creep, steel P92
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