The cut off varies year wise as there is nothing out for Gate 2018 cut off but as per last years detail, the cut off for Metallurgy (BARC OCES in 2017) was 646 and for BARC (OCES/DGFS in 2016) it was 606 as it keeps on fluctuating so it would be better if you get 650 or above as this would be the safest score to get recruited there.

Good Luck!!!