... breaker. Voltage grade:High voltage72.5kv-252kv GIS/GCB;Ultra-high voltage 363kv-800kv GIS/TGCB;Extra high voltage 1100kv GIS;Main customers:China XD Electric Co ... steel, stainless steelSurface treatment: Transparent oil, rust-proof oil. High voltage electric power equipment in forging connecting flange 5083,6A02,6061,6063,2A50,5A05