title: ÐÐ»Ð¸ÑÐ½Ð¸Ðµ ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½Ð¾Ð³Ð¾ ÑÐµÐ¶Ð¸Ð¼Ð° Ð¸ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¾Ð¹ ÑÑÐµÐ´Ñ Ð½Ð° Ð´ÐµÐ³ÑÐ°Ð´Ð°ÑÐ¸Ñ ÑÑÑÑÐºÑÑÑÑ Ð¿ÐµÑÐ½ÑÑ ÑÑÑÐ± Ð¸Ð· Ñ ÑÐ¾Ð¼Ð¾Ð½Ð¸ÐºÐµÐ»ÐµÐ²ÑÑ ÑÐ¿Ð»Ð°Ð²Ð¾Ð² ÑÐ¸Ð¿Ð° HK Ð¸ HP
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Effect of temperature and technological medium on the degradation of the structure furnace pipes of chromium-nickel HK and HP steel type
Creators: name: Ð¨Ð¸Ð»Ð¾Ð²Ð¸Ñ, ÐÐ½Ð°ÑÑÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
Subjects: Ð¿ÐµÑÐ½ÑÐµ Ð·Ð¼ÐµÐµÐ²Ð¸ÐºÐ¸
Ñ ÑÐ¾Ð¼Ð¾Ð½Ð¸ÐºÐµÐ»ÐµÐ²ÑÐµ ÑÐ¿Ð»Ð°Ð²Ñ
ÐºÐ¾ÑÑÐ¾Ð·Ð¸Ñ
Ð½Ð°ÑÐ³Ð»ÐµÑÐ¾Ð¶Ð¸Ð²Ð°Ð½Ð¸Ðµ
Ð´ÐµÐ³ÑÐ°Ð´Ð°ÑÐ¸Ñ ÑÑÑÑÐºÑÑÑÑ
furnace coils
nickel-chromium alloys
corrosion
carburization
structure degradation

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description: In this paper, we consider the role of service temperature, technological environment and the duration of the operation of furnace coil tubes of alloys of the HK and HP type on the metal structure, the change in the phase composition and the corrosion processes on the inner and outer surfaces. The analysis of literature data on the history of the creation of high-alloyed chromium-nickel alloys, the features of their production and classification. The conditions for the use of high-alloyed chromium-nickel alloys for chimneys in the petrochemical industry, as well as the causes of premature tube failure and emergency situations, are analyzed in detail. Presently, the structural study of such materials continues to be relevant. Tubes metallography researches have been carried out and mechanical tests have been conducted. Special attention was paid to structure changes depending of the service parameters. The influence of temperature and diffusion processes on the inner and outer surfaces of the tubes on the transformation of eutectic carbides and the change in the proportion of the metal component in them was revealed. It has been established that at operating temperatures of 900â970 Â°C along the entire length of HP alloy tubes there are signs of creep in the form of micropores at the matrix â eutectic carbide interfaces. A significant effect on the corrosion processes of the service temperature gradient along the length of the pipes was revealed. It was shown that with a temperature increase above 970 Â°C, the degree of decarburization and cracking on the outer surface, as well as creep pores, sharply increases. Recrystallization processes on the outer and inner surfaces of cast tubes of HP type alloy are considered.