As refractory material, the porous plugs are for bottom argon-blowing steel refining. Refractory material-Porous PlugsThe porous plugs are for bottom argon-blowing steel refining and classified into two types, i.e. slot type and direct hole type ,which are developed by adopting high-tech and are characterized by their high strength , good erosion resistance and corrosion resistance, high blowing ...