METHOD OF PRODUCING COLD-ROLLED PRODUCTS Russian patent published in 2019 - IPC C21D8/02 C22C38/00 B21B3/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy. Performing steel melting, casting, hot rolling, etching, cold rolling, annealing, cold rolling, annealing and temper rolling, at that, the first cold rolling is performed with reduction of 20–40 %, and second cold rolling – with reduction of 20–55 %, and annealing after each cold rolling is performed by heating rolls to annealing start temperature of 700–730 °C, holding for 7–15 hours at reduction to annealing end temperature, wherein annealing start temperature is 15–35 °C above annealing end temperature, then cooling at rate of 20–35 °C/h. Besides, steel contains, wt%: carbon 0.20–0.40, silicon at least 0.70, manganese 0.60–1.20, chromium min. 0.70, iron and unavoidable impurities – the rest, hot rolling is finished at temperature of 850–900 °C, strip winding is carried out at temperature of 620–690 °C, and temper rolling is performed with reduction of 0.4–0.7 %.

EFFECT: providing the required complex of mechanical properties, stable and uniform along the strip length.

4 cl, 3 tbl