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The influence of P265 steel surface conditions on the stability of the oxidation products layer DOI:10.15199/40.2018.3.2

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The nature of the operation of power devices in high temperature conditions requires the use of top quality raw materials and the selection of the right grade of steel, because at elevated temperatures, the products are exposed to creep, relaxation, heat fatigue or accelerated corrosion [1]. Therefore, they require the use of steel grades that meet the conditions in this respect. An important group of metal materials is steel designed to work at elevated temperatures, commonly referred to as boiler steels, which can be used under such conditions. The main applications are the machinery and equipment used in the power industry, such as boiler and turbine fittings, pressure vessels for the chemical or power industry, water turbines, steam and gas turbines [2]. When selecting the steel grades, one must follow the requirements that apply to the quality of the parts and the correct use of the equipment under specific operating conditions. Besides, in case of the well-established steel grades, the use properties are determined by the technology of manufacturing of the steelmaking product as well as the technology of manufacturing of the given part of the device. It is important that these materials are characterized by high strength, durability and resistance to high temperature corrosion. An important aspect here is the way of preparing steel surfaces, which are going to be exposed to high temperatures [3]. The oxidation of the steel triggered by high temperature causes the formation of scale, which is important in the operation of the structure, both in the aspect of the oxidation process and with respect to the adhesion of the scale to the surface of the steel. The adhesion of scale is dependent on many factors: the time and temperature of oxidation, the type of oxidizing atmosphere, and above all, the chemical composition and the steel structure. Apart from the above mentioned factors, the physicochemical state and surface microst[...]

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