On the basis of results of investigations and laboratory tests, a composite material produced by hard facing with a charge consisting of tungsten carbide particles and a Ni-Cr-B-Si alloy has been chosen as the most suitable for the surface reinforcement of parts operating under intense abrasive-gas wear conditions. To improve the processing qualities of such a charge, a flux should be added to it. The recommended charge composition for induction hard facing is: Relit 56–61%, PG-KhN80SR4 alloy powder 33–38%, boric anhydride 2.8–3%, dehydrated borax 1.5–1.6%, and silicocalcium 1.7–1.0%. Charges of this composition are being used for hard facing various parts of metallurgical plant units (small bells and charge distribution hoppers, valves of blast furnace charging devices, blades of sintering machines, and the like).

Of all the surfacing materials tested the greatest hardness at elevated temperatures is exhibited by electrodes made by the cermet method using chromium carbide as a base, i.e., GK-10 and GK-15 with a metal binder.

The structure of an alloy consisting of a mixture of coarse- and fine-grain carbides and borides arranged as isolated inclusions in the base metal imparts high strength and wear resistance to the weldedon layer, thus confirming the possibility of direct high-grade alloying of the welded-on layer with highmelting compounds.