METHOD OF MAKING COLD-ROLLED STRIPS AT CONTINUOUS MILL 2500 Russian patent published in 2012 - IPC B21B1/28 

FIELD: process engineering.

SUBSTANCE: proposed method comprises strip rolling at rough rolls of final stand with feed of rolling oil, coiling rolled strips and recrystallization annealing in bell-type furnace with protective atmosphere. Higher surface finish of rolled strip is ensured by feeding rolling oil separately via two systems, i.e. system E1 feeds rolling oil to stands 1^st to 3^rd while system E2 feeds rolling oil to stand 4^th. Note here that total content of rolling oil in system E1 equals 1.2-3.2% while that in system E2 makes 0.80-2.50%. While metal annealing is performed in protective atmosphere with increased protective gas flushing volume to 30 m³/h at maximum emulsion evaporation temperature of 450-550°C by stand thermocouple for 5 hours. Note also that roughness of final stand roll barrel making 4.0-4.5 mcm.

EFFECT: higher quality of cold-rolled strips from low-carbon steel for automotive industry.

1 tb, 1 ex