Technological features of furnace equipment part casting by gasified models

Abstract

The purpose of the work is to study the casting characteristics of a Fe-Cr-Ni-based alloy with improved heat-resistant properties for the production of a kiln roller part. The furnace equipment widely used in the metallurgical, petrochemical, machine-building and other branches of industry is made of heat-resistant steels. It is determined by the operation conditions: high temperature, significant loads, and duration of operation. Development of metallurgical technologies toughens working conditions and requires the properties of heat-resistant materials used for the manufacture of parts of metallurgical equipment to be improved. For this purpose, the influence of pouring temperature on the ingot porosity, alloy fluidity and the technological parameters of casting by gasified model casting have been determined. The composition of the heat-resistant alloy based on the Fe-Cr-Ni-alloying system is proposed. The fluidity of the experimental alloy is studied. It has been found that the fluidity of the experimental sample of steel at the pouring temperature of 1720 °C is 5-10% higher than the fluidity of steel 20Kh25N20S2. The conducted analysis of the programs has shown that the pouring temperature of 1720 °C is optimal in terms of pore distribution. The gating system for casting the part “kiln roller” is calculated. The proposed technology of furnace equipment casting manufacturing from an experimental heat-resistant alloy by gasified models casting allows to obtain high-quality castings that meet the requirements of operation at high temperatures and long-term loads.