89). The thickness of the sheets was 14 mm, the impurity and alloying element content (%): 0.17 C, 0.2 Si, 0.48 Mn, 0.023 S, 0.033 P, traces of Cr, Ni, Cu, As, N. The mechanical properties: σ B = 420 MPa, σ 0.2 = 285 MPa. The steel sheets with the size of 1500 × 6000 mm were cut by the electrospark method into strips with the size of 300 × 150 × 14 mm, suitable for surfacing. Electroslag surfacing was carried out in UEShN-1 equipment with the horizontal plate-shaped consumable electrode with the cross-section of 40 × 3 mm, 500 mm long, working voltage 40 V, current 350–400 A, the surfacing speed approximately 10 cm/min. The power source was VDU-1202. The electrode material was St3 steel. Fused flux AN-348A was used. The alloying mixtures were covered with a layer was a thickness of 1 mm on the surface of the electrode. In alloying was carried out using the powders of boron carbide and chromium nitride, produced at the Institute of Macrokinetics of the Siberian division of the Russian Academy of Sciences by the methods of SHS synthesis, and also mixtures of 85% B 4 C+15%TiB 2 and 85% CrN+15% TiB 2 . Equipment PMT-3 was used for the measurement of the distribution of microhardness in the deposited layers in the direction from the surface into the specimen, with transition through the melting interface at a load of 0.5– 1.0 N, step 50–200 µm. The structure of the deposited metal and the heat affected zone was investigated in a Neophot