In future blast furnace operation which aims at low carbon consumption, it is indispensable to optimize the quality of carbonaceous and ferrous burdens, not evaluations of each individual but both sides of them considering interactions under the coexistence. Therefore, a simultaneous evaluation method of carbonaceous and ferrous burdens at cohensive zone of blast furnaces by softening-melting test which simulated the temperature profile in blast furnaces determined by reactivity of coke was developed. The effect of sinter ore reducibility and coke reactivity on sinter soften-melting property at cohensive zone of blast furnaces were evaluated. With increasing CRI, coke reactivity, gasification start temperature lowers as a result of increasing the reduction rate of sinter at 900-1 000°C and increasing softening shrinkage resistance at the initial stage of the shrinkage near 1 200°C.

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