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The data of different authors on the thermal conductivity of wustite Fe1-xO,magnetite F3O4, hematite Fe2O3 and pure iron are systematized. The generalizedvalues are described by piecewise smooth functions containing as varyingparameters the temperatures of magnetiv and polymorphic (for iron)transformations as well as the thermodynamic stability boundary (for wustite).At polymorphic transformation a finite break of the thermal conductivityfunction is envisaged, at othet critical points only a break of its temperaturederivative is acceptable. The proposed formulas are presented in two forms: thegeneral form that allow varying the values of critical temperatures and theparticular form corresponding to their basic values: the boundary ofthermodynamic stability of wustite - 570 C, the Curie points of magnetite - 575C, hematite - 677 C, iron - 770 C and polymorphic transformation temperature ofiron - 912 C. To calculate the thermal conductivity of oxide scale as a whole,it is proposed to take into account separately metallic iron and compositematrix of iron oxides. Model computations using the proposed formulas showsthat the true thermal conductivity of oxide scale (without pores), depending onthe temperature may be from 3 to 6 W / (m K) in the absence of metallic ironand up to 15 W / (m K) if free iron is released in the eutectoid decay ofwustite. The effective thermal conductivity of oxide scale, taking into accountits real porosity, may be lower by 15-35%. The obtained dependencies arerecommended for use in mathematical simulation of production and processing ofsteel products in the presence of oxide scale on their surface.

Thermal conductivity of oxide scale and its components in the range from  0 C to 1300 C: Generalized estimates with account for movability of phase  transitions