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The cokes with low reactivity index (CRI) and high coke strength after reaction (CSR) are generally regarded as good quality and acceptable for blast furnace (BF) operators. However, the cokes with greatly varied CRI and CSR can also be used in large BF with stable operation. Thus, it can be suggested that the CRI and CSR tests should be disputed and distrusted. In this paper, various coke-quality...