Procurement of dipper plate casting type ii outer fixed drg no 3 7 1101 13 02455 rev 01 material heat resistant cast iron grade i type e of is 3355 note original chemical composition certificate of material issued by govt authorised nabl lab at free of cost , dipper plate casting type iv inner fixed drg no 3 7 1101 13 02602 rev02 material heat resistant cast iron gri type e of is 3355 note original chemical composition certificate of material issued by govt authorised nabl lab at free of cost , outer curb casting drg no 2 7 1101 13 01825 rev 01 material cast steel is 4522 gr 4 note original chemical composition certificate of material issued by govt authorised nabl lab at free of cost and other related items