Advanced heat resistant steels for power generation by R. Viswanathan

By R. Viswanathan

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Subsequently, power plants with steam temperatures ranging from 593 to 610°C have been successively built, and a study is already under way to implement a temperature of 625°C class using ferritic steels. For steels used for high temperature components in power plants, good 33 34 ADVANCED HEAT RESISTANT STEELS FOR POWER GENERATION mechanical properties, corrosion resistance and fabric ability are generally required, and creep strength in particular is the most important property for high temperature and high pressure applications.

S::. m c ~ e~ 100 a~ a:: Q. s::. II) ~ Q o~~--~~~--~~--~~--~~~ 1920 1940 1960 1980 1900 2000 Year Fig. 1 Historical Improvement of Creep Rupture Strength in Steels for Boiler rupture strength at 600°C by year of development. Based on 9Cr-lMo steel (T9) and 12Cr steel (AISI410), which was put into service around 1940, subsequent development focusing on the 60 MPa class took place from 1960 to the early 1970s. Continued efforts saw 100 MPa class steels developed in the early 1980s, with 140MPa class steels appearing in the early 1990s.

An unusual example of this type of carbide is C03W3C, where cobalt, a non carbide forming element, can replace W, a strong carbide forming element, to give a more stable form of M6C. 25 Cr-1% Mo steel in 1959 using carbon extraction replicas and transmission election microscopy and the results obtained are presented in Fig. 8. a~ 0)" ~0) a. E 0) I- 950 ~------------------------ Fe % Carbon Fig. 5 5 10 50 100 500 1000 Tempering Time (Hrs) Fig. 25 Crl%Mo steel. This diagram was first published in 1959 analytical methods it was thought worthwhile to re-assess the carbide precipitation sequence and the results obtained are given in Fig.

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