Through the analysis it is obtained that main reason for steel 10B28 scab is that nitrogen content in the molten steel is too high

and titanium in molten steel is not enough to completely fix nitrogen

resulting in a large number of fine BN precipitates at grain boundary

and the slab cracks are formed in the straightening process to form the wire surface scab in rolling process. Through sampling analysis

it is confirmed that the main cause of high nitrogen content in molten steel is slagging to use high nitrogen content (4.6% ) slow-release deoxidizer during refining. By using aluminum shot to replace slow-release deoxidizer

the nitrogen increases in refining process can be reduced from 43. 4 x 10

-6

to 11.4 x 10

-6

. By the measures including increasing the BOF tapping carbon from 0.06% to ≥ 0.08%

reducing the heating power in the early stage of refini

ng

and replace slow-release deoxidizer by Al shot

the nitrogen content of steel 10B28 is stably controlled below 70 x 10

-6

and the qualified rate of wire rod is increased from less than 50% to ≥ 98%.