Spray material for tundish is a basic unshaped refractory, mainly composed of magnesia or magnesia-alumina spinel, composite binders and functional additives. It is constructed by spray gunning. After curing and baking, it forms a compact working lining, featuring good resistance to molten steel penetration and slag attack, superior thermal shock stability, and easy stripping during tundish overhaul. Typical chemical composition: MgO 80%～90%. It is widely adopted for the working lining of continuous casting tundishes. Typical physical indexes: bulk density ≥2.0 g/cm³, cold modulus of rupture ≥2.5 MPa.
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