Silicon saturation of pipe steel AISI 321 at exposure in the silencing mixture over various time intervals.

The material of tubular coils of oil refining and petrochemical processes is steels with increased heat resistance and heat resistance. As a rule, austenitic steels are most often used, which withstand rather high operating temperatures and pressures for a long time. One of these steels is AISI 321 steel, which is often found as a material version of tubular coils. During the operation of the tubular furnace, it is often possible to observe increased carbon saturation of the surface layer of the coil pipes due to various adverse factors, one of which is coke deposition along the inner surface of the pipes. Carburization is one of the most common causes of a fairly early failure of pipes due to the loss of materials of sufficient ductility characteristics and the acquisition of increased brittleness material. Increased brittleness is a frequent precursor to the formation of brittle cracks in pipes and, as a rule, their depressurization with the development of emergency situations. Saturation with silicon by a certain thickness of the surface layer of the tube coils of tubular furnaces before their commissioning can slow or even prevent the diffusion of carbon into the metal, since silicon is a carbon antagonist. In this regard, studies to study the features of silicon saturation of pipe steel AISI 321 at exposure in the silencing mixture for various time intervals are relevant. [ABSTRACT FROM AUTHOR]