The present invention relates to a sub-lance probe for a converter, and more particularly to a sub-lance probe for measuring the temperature and oxygen concentration of the molten steel in the converter in the converter of the steelmaking process.;The present invention has a sub-lance main body 6 having a holder 29 at the bottom, a probe electrode 25 coupled to the bottom of the holder 29 and connected to the probe plug 26, and the probe electrode 25 It is connected by the wire and the 27, consisting of a sampling mold 28 is contained in the molten steel in the converter, the lower end so that the operator can know the physical characteristics of the molten steel contained in the sampling mold 28 In the converter sub-lance probe to be lost, the upper recovery pipe 30 is inserted into the sub-lance main body 6, is inserted into the lower portion of the upper recovery pipe 30, the outer diameter of the upper recovery pipe (30) It characterized in that the lower vanishing branch pipe 31 is configured to be 1/3 of the outer diameter.
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