Ishlab chiqish

Pic. 2. Microstructure image of non – metallic and oxide inclusions in the alloy taken by Axiovert 40 MAT microscope
First of all, a basic 2.5 ton electric arc furnace was selected. After checking that the linings of the furnace were in good condition, first small and then large charcoal materials were loaded into the furnace. As soon as the alloy starts to liquefy, based on the weight of the alloy 3 percent limestone (CaCO₃), FeSi 65 and FeMn 90 grades of ferroalloys were loaded into the furnace as flux. After the alloy is completely liquefied, the liquid alloy is mixed, three samples are taken, and the chemical composition of the alloy is checked. Due to the increased carbon content of the alloy as a result of the inspection, FeO (okolina) was introduced into the furnace (Table 2).
Before loading the liquid alloy into the ladle, the ladle was heated to a temperature of 800-850 ^oC for 45 – 50 minutes. The main purpose of heating is to prevent the liquid alloy from sputtering when poured from a high temperature and to prevent the liquid alloy from oxidizing[4 – 13].
Tab. 1.
Chemical composition of 35XGCL steel (according to GOST 977 – 88)

Elements, %
C	Si	Mn	Ni	S	P	Cr	Cu