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Item Data Item Data proportion 4.8g/cm3 Fe2+ 23.85% bulk 2.5g/cm3 Fe3+ 40-42% Breaking rate 0.05% Fe3O4 4.45% Wear rate 0.04% Al 0.17% Hardness 7 S 0.26% porosity 47% Ferrous iron 20-40% Nonuniformity coefficient K80 1.8