PRODUCT INFORMATION Category: Nickel Alloy (ER) Alloy: WWNA99 Class: ERNi-CI Description: This classification is used for tig and mig welding of cast irons. Major use is the repair of gray iron castings. The welds are easily machinable. Chemical Composition Ni 90.0 min C 1.0 max Mn 2.5 max Fe 4.0 max S 0.03 max Si 1.0 max Cu 4.0 max Al 1.0 max Others 1.0 max