Abstract: For improving the problem of non-metallic inclusions in low carbon aluminum killed steel produced by CSP process at Jiuquan steel Co,with sampling at each phase of steelmaking and continuous casting,the study of inclusions in steel is carried out by metallographic analysis, electron probe and scanning electron microscopy. The results show that under the current process conditions,the casting slab T[0] is more than 30 x 10^-6 ,by BOF blowing N₂/Ar exchange process,LF soft blowing 36 min and lable heel 2% ~4% ,the 2μm inclusions ≥66% and spherical inclusions ≥94% ,and the type of inclusions is mainly calcium aluminate plus a certain amount of CaS. After the process optimization, all indexes meet the requirements of DQ deep drawing steel production.

Key words: Low Carbon Aluminum Killed Steel, CSP, Continuous Casting Thin Slab, Non-Metallic Inclusions ,