The surface scabs of 1028 cold heading steel wire rod are analyzed by metallurgy and scanning electron microscope. It is concluded that the main reason is the high nitrogen content (0. 0133% ) in the steel

the Ti in steel (0.033% ) is not enough to completely fix nitrogen

and the excess N with B formes BN precipitates to weaken the grain boundary and form microcracks led to the surface cracking of the billet and finally inherited to wire rod surface after rolling. By reducing the scrap ratio from 21% to 10% and the deoxidization intensity of tapping

adding ferroboron after feeding Ti- Fe wire for 5 min after white slag

controlling the soft blowing volume of LF

and aluminum loss

≤0

.003% during casting process

N is stably controlled within 60 x 10

-6

to ensure Ti/

≥4

the defective rate of surface scabbing is reduced from original 60% to less than 1. 0% .