... in the whole plant has an important role.That part of the steel pipe specification more than the length ... ,respectively,2ton/6ton vacuum induction furnace, 5-ton electro-slag furnace,P7 vacuum consumable electrode furnace fefining furnace,etc.to complete in order ... advanced smelting of special tooling equipment,plus a vacuum induction furnace smelting technology ESR double by open forging billet,hot ...