Material properties and structure of thick-walled elements made of steel 7CrMoVTiB10-10 after long-term annealing

Purpose: Condition assessment of material and welded joints with regard to required utility properties of low-alloy steel for operation at elevated temperature.Design/methodology/approach: The structural and mechanical testing of parent material and welded joint at room and elevated temperature after annealing at 550°C and 600°C for 30,000 h was carried out.Findings: The effect of temperature and duration of long-term annealing on mechanical properties, hardness and structure of tested material and welded joint 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.