Development of a new cored wire based on silica manganese gas-cleaning dust

Abstract

The paper describes the possibility of using cored wire for wear­resistant hardfacing containing waste (dust of gas­cleaners) from the production of silica manganese and aluminum. Hardfacing was carried out using a submerged welding tractor made of silica manganese slag produced by the West Siberian Electrometallurgical Plant. The wear rate on the samples was determined on 2070 CMT­1 machine. The method for it is based on change in the sample mass during the disc – pad test. Chemical composition of the deposited metal was determined by X­ray fluorescence method on XRF­1800 spectrometer and by the atomic emission method on DFS­71 spectrometer. The hardness of the deposited layers was measured using METH­DO hardness tester. Evaluation of the quantity of nonmetallic inclusions was made according to GOST 1778 – 70 using an OLYMPUS GX­51 optical microscope. The coefficient of manganese recovery was found at different ratios of components. This coefficient is associated with the reduction of manganese oxide from manganese­containing flux (due to the carbon contained in the cored wire). With a significant excess of carbon in the cored wire from manganese­containing flux, recovery of manganese exceeds 100 %. The process of manganese recovery was determined by filling coefficient of the cored wire, amount of the carbon­containing material in the charge, and carbon content in the electric­arc coating itself. The deposited metal contains non­deformable silicates and point oxides. Contamination by oxide nonmetallic inclusions of the deposited metal is small. The presence of these non­metallic inclusions does not significantly affect the operational characteristics of the deposited layer.