Abstract:Wetting behavior of liquid slag on surface of Ausmelt lance was investigated by sessile drop method under nitrogen atmosphere. Effects of holding time, temperature, lance material (310S and 316L stainless steel), and Fe (III) content of slag on contact angle were discussed. The results of single factor test show that contact angle of liquid slag on 310S substrate is around 20° at 1 200 ℃, lower than that of on 316L substrate (26°), while contact angle drops to 5° and 20° respectively when temperature rises to 1 250 ℃. Meanwhile, the difference of contact angle on two types of stainless steels substrate expands from 6° at 1 200 ℃ to 15° at 1 250 ℃. When 3% of Fe (III) (mass fraction) is added to slag, the contact angle rises slightly on 316L and 310S for 2° and 9° at 1 250 ℃, which shows weak wettability between slag and substrate. Better slag hanging on Ausmelt lance would be obtained with a relatively higher smelting temperature (1 250 ℃), lower content of Fe (III) in slag and 310S stainless steel as the lance material in practical smelting.