METHOD OF PRODUCING ROLLED STEEL Russian patent published in 2020 - IPC B21B1/00 C21D1/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to hot rolling of steel. To determine structural state of rolled metal by process parameters of rolling steel is obtained with required chemical composition, rolling is carried out with fixation of process parameters and structural condition of obtained rolled stock is determined depending on realized process parameters. At that, mass fractions of structural components are calculated, proceeding from measured surface of metal surface before cooling, thickness of metal and realized mode of heat removal from rolled surface, using finite difference method to solve heat conduction problem for medium with internal heat release sources with virtual breaking of rolled products thickness into layers, wherein for sources of heat release there are layers of metal, in which there are processes of decomposition of austenite at least one of types: ferritic (F), ferrite-pearlite (F + P), pearlite (P), bainitic (B), martensitic (M), decay type is determined, based on rate of heat removal from metal layer and/or its temperature, decay kinetics are given by equation of the form: ∂M/∂τ = f(T), where ∂M is mass fraction increase of decay product per time ∂τ, s, T is temperature, °C, heat release value is calculated by equation dQ = dM × Q_pi, where dQ is heat released as a result of austenite decomposition by any type, J, Q_pi is specific thermal effect of austenite breakdown in i-th type, J/kg.

EFFECT: disclosed is a method of producing rolled steel.

3 cl, 4 tbl