The invention discloses a method of
smelting high-strength
welding wire steel ER80-G from
vanadium-containing molten iron, which includes the steps of: loading the
vanadium-containing molten iron in avanadium extract converter for dephosphorization; after tapping is finished, adding hot-state steel
ladle casting residue to a semi-steel
ladle by 10-20 kg per
ton of steel; loading dephosphorized semi-steel into a
smelting converter, adding thread
cut head or
casting blank
cut head waste steel, performing dual-
slag operation in the converter to perform
smelting, and performing refining in an LFrefining furnace; after the treatment, hoisting the steel to a
continuous casting step, wherein the
casting operation is protected during the whole course of the
continuous casting. In the invention,the
vanadium-containing molten iron is subjected to the double-dephosphorization, wherein the content of
phosphorus in steel is effectively reduced by means of the dual-
slag method; by using a non-aluminum-based deoxidant, generation of Al2O3
impurity in the steel is reduced. A mixture of aluminum
powder and
ferrosilicon powder is added during the refining heating process in several batches at small batch size, so that
sulfur content of the steel is effectively reduced and impurities are removed. The method supplies a strong guarantee to cleanness of
molten steel and
castability of the
continuous casting, and finally achieves the object of smelting the high-strength
welding wire steel ER80-G from vanadium-containing molten iron.