Runner protection tube for steel casting and manufacturing method thereof

A runner protection tube for steel casting, which is made of a slurry composition for forming the runner protection tube for steel casting, the slurry composition includes organic fibers, inorganic fibers, thermosetting resins, thermoplastic resins, inorganic particles, inorganic binders, water, a lubricating oil and a hydrating agent,

• wherein based on a total weight of the slurry composition, an amount of the organic fiber used is 5 wt % to 15 wt %, an amount of the inorganic fiber used is 15 wt % to 25 wt %, an amount of the thermosetting resin is 5 wt % to 15 wt %, an amount of the thermoplastic resin is 1 wt % to 10 wt %, an amount of the inorganic particles is 20 wt % to 40 wt %, an amount of the inorganic binder is 5 wt % to 20 wt %, an amount of water is 15 wt % to 40 wt %, an amount of the lubricating oil is 1 wt % to 10 wt %, and an amount of the hydrating agent is 1 wt % to 10 wt %.