The present invention provides a refractory which combines excellent corrosion resistance and excellent thermal shock resistance, though it was difficult for a conventional refractory to combine both. Further, the present invention provides a nozzle for casting, said nozzle using the refractory. A refractory which comprises at least 40 mass% of MgO and 4 to 30 mass% of a free carbon component, and contains one or more selected from among B 2 O 3 , P 2 O 5 , SiO 2 and TiO 2 in a total amount of 0.3 to 3 mass% with the balance being other refractory components, characterized in that: a void layer is present at an interface between a carbon-containing matrix present on both sides of at least the largest particle among the MgO-containing particles of the refractory and the largest particle; the total thickness of the void layer is 0.2 to 3.0% of the size of the particle; and an inorganic compound formed from both MgO and one or more selected from among B 2 O 3 , P 2 O 5 , SiO 2 and TiO 2 is present on the all or some of the surfaces of the MgO-containing particles.

Refractory and nozzle for casting

PURPOSE: To suppress the deposition of Al2 O3 by using a specific CaO-TiO2 clinker and/or CaO-TiO2 -ZrO2 clinker, a carbon raw material and other refractory raw materials in prescribed ratios. CONSTITUTION: A CaO-TiO2 clinker having a CaO/TiO2 molar ratio of 0.27-1.5 and a CaO-TiO2 -ZrO2 clinker having a CaO/TiO2 molar ratio of 0.27-1.5 and a CaO/ZrO2 molar ratio of 0.42-1.0 are prepared from a CaO source, a TiO2 source and a ZrO2 source each having high purity. The objective refractory for continuous casting is produced by compounding 1-97wt.% of the CaO-TiO2 clinker and/or CaO-TiO2 -ZrO2 clinker with 3-40wt.% of a carbon raw material such as crystalline graphite, <=96wt.% of other refractory raw materials containing one or more materials selected from ZrO2 , stabilized ZrO2 , Al2 O3 , etc., <=10wt.% of an antioxidant such as SiC, <5wt.% of a strength-improving agent such as BN and <10wt.% of a viscosity modifier such as SiO2 , kneading the compounded composition together with a binder, forming the kneaded mixture and baking in a non-oxidizing atmosphere.

Refractory for continuous casting

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Refractory for continuous casting