FIELD: thermochemical treatment of steel articles, mainly, internal surfaces of pipes operating in friction pairs. SUBSTANCE: device has pipe conveyor, heaters and pipeline for supply of saturating gas and withdrawal of reaction products. Gas pipeline has quick-disconnecting joint and at least two partitions secured to its external surface. Distance between partitions is not less than the length of part on which heaters are arranged. In addition, each partition of gas pipeline has annular hollow communicated with discharge section of gas pipeline. EFFECT: higher quality of hardened layer due to maintenance of preset constant composition of saturating atmosphere and temperature along the pipe length. 2 cl, 3 dwg
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