Based on the past trends IIT Delhi generally calls candidates with a GATE score of 500+ for further admission process of M.Tech(Material Science). So as far as your CGPA is concerned you are good to go, but your GATE score is too low. For more details regarding the GATE cut offs for admissions in IIT Delhi. you can visit the below mentioned link:

https://engineering.careers360.com/articles/gate-cutoff-for-iit-delhi