In 9Cr1Mo steel, usually normalizing is done at 1050 deg C and followed by tempering at 750 deg C.Can any one suggest me, after normalizing, what is the mode of cooling (air cooling or water quenching))
Strongly depends which microstructure you want to achieve after normalising.
Best way to choose a cooling media is to look up cooling rates in a time-temperature-transformation diagrams which are available in several studies.
Knowing your preferred cooling rate is the base for choosing a reasonable cooling media.
BR
Very good article with answer: "air cooling"
http://www.documentation.emersonprocess.com/groups/public/documents/articles_articlesreprints/d350827x012.pdf
When the material is normalized by air-cooling from a target temperature of 1900°F (1040°C), a completely martensitic structure with a hardness of approximately 35-40 HRC is formed.
Answer is air cool. On air cool it forms lath martensite. If quenching media is water there are chances of cracking due to severly induced stress because of lath martensite
http://www.nssmc.com/en/tech/report/nsc/pdf/5804.pdf
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