Wear Resistance Increase of Pipeline Valves by Overlaying Welding Flux-cored Wire

Leakage of valves leads to an explosive hazard, as well as business losses. To improve the operational reliability of valves in the practice of using various methods of surface hardening, the main of which is surfacing, are used. For this purpose, a new composition of the cored wire was developed, that provides reception high-chromium steel weld metal alloying system Fe-C-Cr-Mo-Nb. The proposed cored wire provides a comprehensive strengthening of the weld metal due to the formation in the martensitic structure not only chromium carbide, niobium and molybdenum but also intermetallic phases such as Laves that provide this metal high wear resistance under abrasive wear and perception static pressure with high contact load. The results of field trials have shown a significant increase in the service life of valves of pipelines.