The present invention relates to a method of manufacturing a steel plate, comprising a first steel plate, a second steel plate facing the first steel plate, a refractory filler plate filled and disposed between the first steel plate and the second steel plate, And a refractory panel side fastening portion disposed at one or more ends of the refractory filling plate, wherein the refractory panel side fastening portion is a refractory panel side fastening portion connectable to another first steel plate side or other refractory panel side fastening portions which can be disposed adjacent to each other, The present invention provides a refractory panel unit comprising:;
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