PURPOSE: A sub-lance for a converter is provided to prevent deformation of the sub-lance by temperature difference after inserting a deformation preventing member into the sub-lance and changing connection of a main body of the sub-lance with a nozzle. CONSTITUTION: A sub-lance for a converter comprises a sub-lance main body(100), a nozzle(200), and a deformation preventing member(300). The nozzle is screwed in one end of the sub-lance main body. The deformation preventing member is inserted into an inner side of the nozzle and the sub-lance main body. The deformation preventing member prevents deformation of the sub-lance main body and the nozzle.
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