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Pipeline stop valves during operation should possess the erosion resistance of sealing surfaces. For this purpose they are subjected to mechanized arc surfacing with producing of high-alloyed Cr-Ni-Si deposited metal. Further improvement of erosion resistance can be achieved by additional alloying of deposited metal using nitrogen. The paper presents the results of comparative tests of the deposited metal on tear resistance in surfacing using flux-cored wire in argon, carbon dioxide, nitrogen and mixture of nitrogen with carbon dioxide. The best indicators of erosion resistance belong to the deposited metal produced during surfacing in mixture of nitrogen and carbon dioxide. 2 Ref., 3 Tables, 1 Figure.

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