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The steels commonly used for main steam pipelines are low alloy steels SA335-P11 and SA-335P22
Source:Xinsteel   Date:2020-04-13
The traditional pipeline steels in the United States are low alloy steels P11 and P22. With the increase of temperature and pressure, many problems of this kind of steel pipeline can not meet the needs of power plants, and then developed some ferritic steels, they can run at 593 ℃, such as: HT9, HT91, HCM9M , HCM12 and P91 steel. The creep fracture strength of P91 alloy steel is better than that of HT9, HT-91 and HCM9M, so it is widely used in main steam pipelines with a temperature below 595 ℃, and the research on P91 steel at home and abroad has been very thorough, and it is also widely used in super In the critical unit pipeline. For coal-fired power plants, the highest efficiency of P91 steel (X10CrMoVNb9-1) has reached 47% in Denmark's 425MW unit. Only through the use of new and improved pipeline application materials, it is possible to increase steam parameters to achieve further thermal efficiency improvements.
With the improvement of steam parameters, new materials have been developed abroad. The main part of the work has been completed in Japan and Europe. The most prominent ones are Japan ’s NF616 and HCM12A, which were standardized by the American Society for Testing and Materials and the American Society of Mechanical Engineers. P / T92 and T / P122. There is also E911 steel developed in Europe.