ANNEALING METHOD OF MILD STEEL ROLLED AT TEXTURED ROLLS Russian patent published in 2012 - IPC C21D1/26 C21D9/67 

FIELD: metallurgy.

SUBSTANCE: annealing method of mild steel rolled at textured rolls includes heating of cold-rolled coils in bell-type furnace with protective atmosphere consisting of 93% N₂ and 7% H₂ at specified heating speed till the temperature of recrystallisation annealing, holding at this temperature, cooling under the bell with blown out burners and cooling till the temperature 130°C, where the time of coils cooling under the bell with blown out burners is calculated from the expression: where t_F.H - temperature of final holding, °C; t_HBR - temperature of heating bell removal, °C; t_heating - heating total duration, hour; 23, 0.3 - empirical coefficients,°C/hour and °C/hour², correspondingly.

EFFECT: obtaining cold-rolled strip with high-quality surface finishing without defects, minimising the loss of yield, increase of application properties.

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