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    Improving the durability of the cores of the molds for steelcasting components

    Steel Kh12 quenched from 1060–1070°C is the best material for the cores of molds.

    V. S. Popov, N. N. Brykov, V. I. Fidrya, V. Kh. Zima, Yu. M. Konarev in Refractories (1978)