The flow sheet for production of 2 mm ribbon steel Q195L (/%

：≤0. 08C

0.05 ~ 0.10Si

0.30 ~ 0.40Mn

≤0. 035P

≤0.035S) is 80 t converter-ladle alloying and soft argon blowing-150 mm x 150 mm billet casting ribbon steel rolling process. Analysis on edge crack ribbon steel results by using optical

scanning electron microscope and energy dispersive spectrometer show that there are FeO and reticular cracks at crack region. With the process measures including controlling the oxygen content in liquid decreasing io ≤60 x 10

-6

from original ≤80 x 10

-6

increasing argon blowing time from ≥ 3 min to ≥ 5 min

decreasing overheating extent of liquid in tundish to 15-25 ℃ from original 25 ~ 35℃ difference in temperature of both side of heating furnace ≤40 °C

decreasing distance between water cooling -nozzle and increasing reduction of first pass edging rolling by 2 ~ 5 mm

t

he occurrence of the edge cracks of hot-rolled ribbon steel are avoided to get nice production effect.