METHOD TO PRODUCE TEXTURED TRANSFORMER SHEET FROM THIN SLAB Russian patent published in 2014 - IPC C21D8/12 C21D9/46 C22C38/60 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy. To ensure high stable magnetic characteristics of a textured transformer sheet a steel slab with thickness of <100 mm with Si content of 2.5-3.5 wt % is exposed to thermomechanical action made of the following operations: non-obligatory first heating to temperature T1 of not more than 1250°C, first rough hot rolling to temperature T2 in the range 900-1200°C, at the same time the extent of compression (% Rid) during rolling is regulated so that it makes at least 80% with absence of the following heating to temperature T3 or it makes at least 60%, and it is determined from the following ratio $$\text{\%Rid}=\text{80}-\frac{\text{(T3}-\text{T2)}}{\text{5}},$$ with availability of the following heating to temperature T3 below 1300°C, non-obligatory second heating to temperature T3>T2, the second final finishing hot rolling to temperature T4<T3 to thickness of rolled stock of 1.5-3.0 mm, cold rolling in one or several stages with non-obligatory intermediate annealing, in which at the last stage the extent of compression makes at least 60%, the first recrystallisation annealing, not necessarily in the decarbonising atmosphere, secondary recrystallising annealing.

EFFECT: provision of high stable magnetic characteristics of a textured transformer sheet.

6 cl, 9 tbl, 6 ex