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, the constituents other than Al2O3, Cr2O3, MgO, CaO, SiO 2, Fe 2 O 3, ZrO 2 and TiO 2 constituting the 100% complement, the sum of the Al 2 O 3 + Cr 2 O 3 + Fe 2 O 3 + ZrO 2 + TiO 2 oxides representing more than 80% of the 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， CaO小于5％，SiO2小于3％，Fe2O3小于5％，ZrO2小于30％，TiO2小于10％，Al2O3，Cr2O3，MgO，CaO，SiO 2以外的成分构成100％互补的Fe 2 O 3，ZrO 2和TiO 2，占上述化学物质的80％以上的Al 2 O 3 + Cr 2 O 3 + Fe 2 O 3 + ZrO 2 + TiO 2氧化物的总和组成。
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