TUNDISH LINING STRUCTURE AND TUNDISH PERMANENT MONOLITHIC REFRACTORY

To provide a tundish lining structure and a tundish permanent monolithic refractory capable of inhibiting an occurrence of cracking in a permanent lining.SOLUTION: A tundish lining structure comprises an iron shell and a permanent monolithic refractory lined on an inner surface of the iron shell, and is characterized in that a difference (Ta-Tb) between a thermal expansion coefficient (Ta) at a temperature during heat reception in a central part in a thickness direction of the permanent monolithic refractory and a thermal expansion coefficient (Tb) at a temperature during heat reception on an inner surface of the iron shell is 0% or more and 0.20% or less. A tundish permanent monolithic refractory contains 5 mass% or more and 15 mass% or less of burned silica, at least one of an alumina-matter raw material and an alumina/silica-matter raw material as a remainder of a refractory raw material, and further at least one of a dispersant, a binder and a viscosity improver as an additive, and is characterized in that the thermal expansion coefficient at 300°C-700°C is 0.20% or higher and 0.70% or lower and the remaining line change rate at 300°C-700°C is 0% or higher and 0.18% or lower.SELECTED DRAWING: None 【課題】パーマライニングに亀裂の発生を抑制できるタンディッシュのライニング構造及びタンディッシュ用パーマ不定形耐火物を提供する。【解決手段】鉄皮と、当該鉄皮の内面にライニングされたパーマ不定形耐火物と、を備え、前記パーマ不定形耐火物の厚さ方向の中央部における受熱時温度の熱膨張率（Ｔａ）と前記鉄皮の内面における受熱時温度の熱膨張率（Ｔｂ）との差（Ｔａ−Ｔｂ）が０％以上０．２０％以下であることを特徴とするタンディッシュのライニング構造、及び焼成珪石を５質量％以上１５質量％以下含み、耐火原料の残部としてアルミナ質原料及びアルミナ・シリカ質原料の少なくとも一つを含み、さらに添加剤として分散剤、結合剤及び増粘剤の少なくとも一つを含み、３００℃〜７００℃における熱膨張率が０．２０％以上０．７０％以下、３００℃〜７００℃における残存線変化率が０％以上０．１８％以下であることを特徴とするタンディッシュ用パーマ不定形耐火物。【選択図】なし