Abstract
Today it is almost impossible to find any area of human activity in which metal would not be present and would be closely related to development. Therefore, it is necessary to know its properties and what kind of media will be used in order to select the best type of material to use. This study examines some of the various austenitic stainless steels in terms of composition, microstructure, and hardness. For these analyses, it was necessary to follow a series of standard sample preparation procedures that directly affect the exact result, microstructure, and hardness. The percentage of chromium varied from 17 to 18%, which gives the material good passivity. Molybdenum in grades 304 and 304L is presented as a residual content, and in grades 316 and 316L - as an alloying element. Among all the studied materials, AISI 304 showed the highest hardness. The relationship between the alloy composition, microstructure and hardness, and the specific properties of each steel is discussed.
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