Following are the list of core companies which recruit chemical engineers through either GATE or their own exam each year . One can check their recruitment dates regularly , method of selection procedures and can prepare accordingly .

1. NFL ( National Fertilizers Limited ) 
2. BNPM ( Bank Note Paper Mill )
3. IOCL ( Indian Oil Corporation Limited )
4. HPCL ( Hindustan Petroleum Corporation Limited )
5. BPCL ( Bharat Petroleum Cororation Limited )
6. ONGC ( Oil and Natural Gas Corporation )
7. GAIL ( Gas Authority of India Limited )
8. NALCO ( National Aluminium Corporation Limited )
9. BARC ( Bhabha Atomic Research Centre )
10. DRDO ( Defence Research and Development Organisation )
11. KRIBHCO ( Krishak Bharati Cooperative Limited )
12. ISRO ( Indian Space Reseach Organisation )
13. SAIL ( Steel Authority of India Limited )
14. NMDC ( National Mineral Development Corporation ) 
15. NPCIL ( Nuclear Power Corporation of India Limited )
16. Vizag Steel Plant
17. EIL ( Engineers India Limited )
18. OIL ( Oil India Limited )
19. IOF ( Indian Ordanance Factories )
20. FACT ( Fertilizers and Chemicals Travencore Limited ) 
21. BIS ( Bureau of Indian Standards )

22. NRL ( Numaligarh Refinery limited )