(1) Furnace cap: composition of molten metal, heat radiation, furnace gas scouring;

(2) The molten pool and the bottom of the furnace: in contact with the molten metal liquid, the oxygen flow impacts the quenching and rapid heat around the ventilating brick;

(3) Furnace body: slag erosion, combined action of gas metal liquid and slag (including mechanical damage under the loading side)

(4) Steel tapping port: The working surface temperature rises sharply when tapping, and it is subject to wear by molten metal and slag.