Provided is a water-cooled lance formed from a lance main body part and a nozzle part provided at the tip of the lance main body part, wherein an outer sheath (151b) provided on the outermost part of the lance main body part is formed from a material having a coefficient of linear expansion greater than coefficient of linear expansion of the bare metal. Thus, deposition of the bare metal on the outer surface of the lance main body part is suppressed.
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