Material having the following average chemical composition, in percentages by mass on the basis of refractory oxides and for a total of 100%: - more than 50% of Al2O3, - more than 4% of Cr2O3, - less than 20% of MgO, - less than 5% of CaO, - less than 3% of SiO2, - less than 5% of Fe2O3, - less than 30% of ZrO2, - less than 10% of TiO2, constituents other than Al2O3, Cr2O3, MgO, CaO, SiO2, Fe2O3, ZrO2 and TiO2 constituting the balance to 100%, the sum of the oxides Al203 + Cr2O3 + Fe2O3 + ZrO2 + TiO2 representing more than 80% of said chemical composition.
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机译：具有以下平均化学成分的材料，基于耐火氧化物的质量百分比，总计为100％：-大于50％的Al2O3，-大于4％的Cr2O3，-小于20％的MgO， -少于5％的CaO，-少于3％的SiO2，-少于5％的Fe2O3，-少于30％的ZrO2，-少于10％的TiO2，Al2O3，Cr2O3，MgO，CaO以外的成分在构成余量为100％的SiO 2，Fe 2 O 3，ZrO 2和TiO 2中，氧化物Al 2 O 3 + Cr 2 O 3 + Fe 2 O 3 + ZrO 2 + TiO 2的合计占上述化学组成的80％以上。
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