Distribution of carbon and silicon in 1 X12CrNi25-20 pipe steel having different operating time, during siliconization

• Main Authors: Seitzhaparov, Bexultan, Rubtsov, Aleksey, Shermatov, Djamshed, Strokina, Ulyana
• Format: Conference Proceeding
• Language: English
• Subjects: Carbon; Carburizing; Coils; Coking; Heat resistance; Heat resistant steels; High temperature; Silicon; Siliconizing; Thermal resistance; Tubes
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0196777

X12CrNi25-20 steel is most often used in high temperature conditions as a material version of reaction furnace coils and is characterized by increased heat resistance and heat resistance. Due to the typical operating conditions of the reaction furnaces, very often the metal of the coil tubes is subjected to carburization, both from the inside and from the outside. The carburization of furnace pipes from the inner surface is facilitated by coking and a working hydrocarbon medium. Carburization of the metal starts the process of embrittlement, which leads to a deterioration in plasticity, as a result, the formation of brittle cracks and premature destruction. Preventing or at least slowing down the carburization of the metal can be helped by the process of siliconizing it in various mixtures containing silicon. Since silicon is a carbon antagonist, it can help solve the problem of active diffusion saturation of metal carbon during operation of furnace coils. In this regard, an urgent topic is the study of the characteristics of the distribution of carbon and silicon in samples cut from fragments of the coil tubes of a reaction furnace from steel X12CrNi25-20 with different operating times, during their siliconization.