Evaluation of the efficiency of filtration cleaning of the ingots of EP708-VD heat-resistant alloy obtained in an open arc furnace
摘要
We perform experimental verification of a new system of filtration in the course of production of consumable electrodes made of ÉEP708-VD heat-resistant alloy containing nonmetallic inclusions, carbonitrides, and crust inversion in a small-capacity electric-arc steel-making furnace under the conditions of the JSC SMK. The alloy was poured from a stopper ladle from above with the help of a specially designed pouring funnel with a system of two filters: a coarse filter with a cell 10 mm in size and a fine ceramic foam filter with cell sizes of 10 ppi and 5 ppi (10 holes per 1 inch and 5 holes per 1 inch, respectively). The efficiency of application of these filters was assessed by comparing the parameters of contamination with similar ingots obtained without filtration according to the methodology applied at the JSC SMK. We also present a plot of casting of a single ingot by using filtration. The chemical composition of inclusions was controlled by the method of energy-dispersive X‑ray spectroscopy (EDS). We perform the comparative analysis of contamination of an ingot of ÉEP708-VD heat-resistant alloy with nonmetallic inclusions, carbonitrides, and scab obtained in an electric arc steel-making furnace according to the classical technology. The presented research results make it possible to clarify the main casting parameters and improve the overall quality of the metal.