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Item MT-1 MT-2 MT-3 MT-4 MT-5 MT-6 Al2O3(%) ≥ 62 64 66 65 62 65 MgO(%) ≥ 11 12 10 13 12 10 C(%) ≥ 6 7 8 7 5 10 Refractoriess under load ℃ ≥ 1570 1650 1570 1480 1690 1700 Refractoriness℃ ≥ 1690 1730 ...