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The life time of super 304H austenitic steel power boiler components under the unstable operation conditions

Dobrzański J., Zieliński A., Purzyńska H.

Archives of Materials Science and Engineering

2015

Vol. 76, nr 2

115--121

Purpose: The purpose of the work was to analyse the components of Super 304H (X10CrNiCuNb18-9-3) steel steam pipelines of power units after long-term service beyond the design work time. Design/methodology/approach: The material for investigations included the 4th stage steam superheater coils, in the form of ø 42.4 x 8.8 mm pipes, made from Super 304H (X10CrNiCuNb18-9-3) steel, intended for operation under creep conditions at the design temperature 620°C and design pressure 28.5 MPa. Findings: The effect of cyclic creep, and therefore shut-downs and repeated start-ups after long-term service under creep conditions beyond the design work time was determined. Research limitations/implications: Practical implications: The presented method can be used for evaluation and qualification of structural changes in power station boiler components operating under creep conditions. Originality/value: The obtained results of investigations will be the elements of material characteristics developed by the Institute for Ferrous Metallurgy for steels made from them working under creep conditions.

Structure and properties of Super 304H steel for pressure elements of boilers with ultra-supercritical parameters

Zieliński A.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 2

403--409

Purpose: Material condition assessment with regard to required utility properties of Super304H austenitic steel for operation at elevated temperature. Design/methodology/approach: The structural and mechanical testing at room and elevated temperature after annealing at 650°C and 700°C for 1000 and 3000 h was carried out. Findings: The effect of temperature and duration of long-term annealing on mechanical properties, hardness and structure of tested was determined. Practical implications: The presented method can be used for evaluation and qualification of structural changes in power station boiler components operating in creep conditions. Originality/value: The presented results of changes in the mechanical properties, structure and in the precipitation processes are applied to evaluation the condition of the elements in further industrial service.