METHOD OF PRODUCING COLD-ROLLED SHEET STEEL FROM ULTRA-LOW-ALLOY STEEL Russian patent published in 2012 - IPC C21D8/04 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises hot-rolling of strip plate, strip cold rolling, recrystallisation annealing with curing at 720-760°C and temper-rolling. Note here that cold-rolling is carried out with total relative reduction of 70-85%, curing duration at recrystallisation temperature is set to equal 22-25 h, while temper-rolling is performed with relative reduction of 0.7-1.5% in rolls with surface roughness Ra = 1.8-4.7 mcm.

EFFECT: higher TH-effect and product yield.

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