METHOD OF ANNEALING COILS OF COLD-ROLLED MILD STEEL Russian patent published in 2012 - IPC C21D1/26 C21D9/67 

FIELD: metallurgy.

SUBSTANCE: method of annealing coils of cold-rolled mild steel includes coils heating up to the temperature of recrystallisation annealing set by the test bed thermal couple, holding at this temperature, holding under the bell with blown out burners and cooling, note that annealing temperature under the furnace bell is set to 820°C by zone thermo couple, the temperature after heating is 670°C by test bed thermal couple, the temperature of coil core is 650°C, coils cooling to the temperature 600°C by test bed thermal couple is done at a speed 16°/hour, then the coils are held under the bell with blown out burners for 5 hours, then final cooling by water is carried out from the temperature 280°C by test bed thermal couple.

EFFECT: increase of strip surface quality, uniformity of physical-mechanical properties of metal and increase of application properties.

1 dwg, 1 ex