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Scope of metallurgy is good whether it is in core or non core field. Non core field has already mentioned in other answers like you can be a business analyst, can go in consultancy companies etc. You can do MBA, IAS, MS, Mtch, MSc, Mphil etc. Many non core companies come for metallurgy as well in PEC. So in non core field you have a large scope.
Now moving on to the core field. First of all only those who have interest or whose interest build with time in metallurgy goes into core. Like in my batch only 4-5 were interested in core field out of 30 students. Scope:
1. Automobile companies need Metallurgical Engineer. Eg Maruti Suzuki
2. Construction companies like L&T need Metallurgical Engineer
3. Oil companies like Indian Oil needs Metallurgical Engineer
4. Iron & Steel industry needs Metallurgical Engineers in large number like Tata Steel, Steel Authority of India Ltd. (SAIL), Jindal Steels
5. Manufacturing Industry needs Metallurgical Engineer like foundry, forging, sheet metal companies etc.
6. There is a need of Metallurgical engineer in Bhabha Atomic Research Centre (BARC), NALCO, Bureau of Indian Standards, DRDO etc.
The list goes on.
So it depends on an individual, if one has the right direction and right zeal, he/she can do anything and everything.