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Advanced Chromy Fire Research Paper

2609 Words11 Pages

Abstract:In the never ending effort to improve the boiler and pressure vessel performance, companies are hunting to modify the materials to cope up mainly to power demand and other applications in India. Advanced Chromoly steel (ASTM A335 P91/T91) are experiencing more worldwide usage, which is promising materials replacing the austenitic steel that ensure more creep rupture strength at elevated temperature up to 650 °C. The systematic research towards the development of ferritic steels especially T/P91 material is given in detail. The metallurgical aspects of the structural transformations and hardness properties of this steel are highlighted along with the weldability characteristics. Further notification in material composition to improve creep properties of this material and the development of newer grades like T/P92 ,enough 616 and also modified 21/4 Cr I Mo (grades T23 and T24) are also discussed. Keywords: High temperature materials, History of ferritic materials, …show more content…

The susceptibility to hydrogen induced stress corrosion cracking is more with higher hardness values whenever the hardness values are more than about 350HV.In such a situation X20 is most susceptible with P91 coming next and P22 being not Susceptible.Hence,Certain mandatory welding controls are being applied for such susceptible steels based experience with X20 Material in Germany. The main requirements of relevance for mitigating this form of corrosion are as follows 1.Intermediate cooling after welding to 80-100°C before Post weld heat treatment(PWHT)to ensure complete transformation of austenite (formed during welding) heat to martensite. 2.Not allowing the temperature to fall below 80°C before PWHT so as to keep the weld region dry and also increase the mobility of hydrogen

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