Effect of Siliconizing on the Low-Cycle Fatigue of Steel

Khisaeva, Z. F.; Кузеев, И.Р.

doi:10.1023/b:msat.0000049820.51905.31

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…A lot of works is devoted to research in the field of siliconization of metals [1][2][3][4][5][6][7][8][9][10]. Analyzing the failures of tubular furnaces of oil refining and petrochemical industries, it can be concluded that the main reason for their failure is coking and carburization of the internal surface of furnace coils.…”

Section: Introductionmentioning

confidence: 99%

Formation of silicated layer of austenitic pipe steel with different pipe sizes

Рубцов

Shermatov

Khabibullin

et al. 2022

J. Phys.: Conf. Ser.

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Tubular furnaces of hazardous production facilities are unique technical devices, and serve for open fire heating of various process media to relatively high temperatures. Some of the furnaces, such as pyrolysis furnaces, hydrogen conversions are also reactors that serve to decompose the hydrocarbon feedstock into separate components. The most important element of the structure is a tubular coil. The effect of high temperatures and working media on the coil metal inevitably leads to metal degradation by forming various defects, changing the structure and mechanical properties for the worse. One of the most unfavorable moments is considered saturation of the surface layers of the metal with carbon or another - carburization of the metal. When the metal is carburized, its embrittlement occurs and the probability of brittle destruction increases. All this can lead to frequent shutdown of furnaces for repairs and significant costs. One way to contain the active diffusion of carbon into the metal may be to silicate the surface of the coil elements using different silicating mixtures, since silicon can effectively delay carbon incorporation. In this work, studies are carried out on the peculiarities of the formation of a silicated layer in fragments of pipes with dimensions of 160x6 mm, 32x2 mm, 57x4 mm made of steel 08Kh18N10T depending on the holding time in the silicating mixture.

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Section: Introductionmentioning

confidence: 99%

Formation of silicated layer of austenitic pipe steel with different pipe sizes

Рубцов

Shermatov

Khabibullin

et al. 2022

J. Phys.: Conf. Ser.

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“…All of the above causes an emergency and premature shutdown of the reaction furnace. One possible and inexpensive solution to this problem is the use of special thermodiffusion coatings based on silicon -silication [1][2][3][4][5][6][7][8][9][10]. Since silicon has a minimal chemical affinity for carbon, it should serve as an effective barrier to the diffusion of carbon into the metal in one case, and in another case, to slow down the effects of iron as a catalyst for coke formation.…”

Section: Introductionmentioning

confidence: 99%

Features of siliconizing of pipe steel X12CrNi25-20 with various term of operation in the conditions of the reactionary furnace

Рубцов

Shermatov

Seitzhaparov

et al. 2022

J. Phys.: Conf. Ser.

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Most refinery and petrochemical reaction furnaces are operated under harsh conditions characterized by high pressures, temperature, and aggressiveness of the process environment. The high temperature and features of the heated raw material contribute to the formation and deposition of coke on the surface of the furnace pipes, which through adhesion and diffusion phenomena has a negative effect and reduces the operational reliability of the entire furnace, causing such a negative phenomenon as carburization of the metal. Carburization contributes to a significant limitation of the ductility of the metal and increases brittleness, which leads to the formation of various unacceptable defects, in particular the formation of brittle cracks. The occurrence of defects of this type inevitably leads to the depressurization of the coil and, as a result, to the occurrence of emergency situations and emergency shutdown for repair. The problem of carburizing a metal can help solve the silicization of its surface layers, since silicon can serve as an effective protection for active saturation of the metal with carbon. In this regard, a relevant topic is the study of the features of the formation of a modified silicon-based surface layer in the coil tubes of a reaction furnace of steel X12CrNi25-20 with a different operating life in order to increase the reliability and reliability of the furnace during operation.

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“…It is known that siliconizing performed at high temperature is a diffusion-controlled process. It is very important to establish the process parameters that effect the siliconizing in order to select process parameters to attain the desired thickness of silicide layer and properties [7]. Depending on temperature and time of the process, as well as on the composition of the substrate, surface layers containing various phases can be formed [8].…”

Section: Introductionmentioning

confidence: 99%

Silicanizing Process On Mild Steel Substrate by Using Tronoh Silica Sand: Microstructure, composition and coating growth

F.M.Y

Othman

Mustapha

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A new Silicanizing process on formation of coating on mild steel using Tronoh Silica Sand (TSS) is presented. The process was performed in the temperature range 1000-1100°C and with varying deposition time of 1-4 hours. Influence of the layer and the substrate constituents on the coating compatibility of the whole silicanized layer is described in detail. Morphology and structure of the silicanized layer were investigated by XRF, XRD and SEM. It is observed that diffusion coatings containing high concentrations of silica which profile distribution of SiO 2 in the silicanized layer was encountered and the depth from the surface to the substrate was taken as the layer thickness. The results also depicted that a longer deposition time have tendency to produce a looser and larger grain a hence rougher layer. The silicanized layer composed of FeSi and Fe 2 SiO 4 phases with preferred orientation within the experimental range. It is also found that longer deposition time and higher temperature resulted in an increase in SiO 2 concentration on the substrate (mild steel). IntroductionMild steel is used in large tonnages in marine applications, transportation, construction and metalprocessing equipment. However these steels are vulnerable to very high corrosion rates in aggressive solutions and atmospheres due to their nature of limited alloying content [1][2].Protective coatings are typically employed to protect the steel surface from corrosion. Because of its importance as an engineering material, there have been unending efforts by researchers to prevent its degradation caused by its susceptibility to corrosion attacks. Diffusion coatings and the corresponding industrial production processes such as siliconizing [3][4][5] were developed about 50 years ago for the purpose of preparing corrosion-resistant surfaces on unalloyed or low alloyed steels. Their composition did not exceed the limits of solid solutions. The preconditions for such a finishing process are that the alloying elements should have relative high diffusion rate into the substrate, the substrate should be insensitive to structural changes during the heat treatment preparation, and the diffusion rate of the coating components into the substrate during the application should be low. The last condition was fulfilled at that time because the coated substrate materials were not developed for long duration at high temperature applications. The coating then grows by solid-state diffusion of the deposited element through the substrate, which results is an excellent chemical compatibility with the substrate [6].

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Effect of Siliconizing on the Low-Cycle Fatigue of Steel

Cited by 7 publications

References 1 publication

Formation of silicated layer of austenitic pipe steel with different pipe sizes

Formation of silicated layer of austenitic pipe steel with different pipe sizes

Features of siliconizing of pipe steel X12CrNi25-20 with various term of operation in the conditions of the reactionary furnace

Silicanizing Process On Mild Steel Substrate by Using Tronoh Silica Sand: Microstructure, composition and coating growth

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