The microstructure and composition of fracture during cold drawing failure of wire coil of SWRH82B stell (0.80~0.84C
0.75~0.85Mn
0.18~0.22Cr
0.015~0.035Al) produced by 280 mm×380 mm casting slab have been observed and analyzed by scanning electron microscope and energy spectrometer. It is obtained that carbon rich con- centration
oxide-sulphide inclusion and microvoid are failure crack initiation of wire coil during cold drawing. The cold drawing quality of SWRH82B steel wire coil shall be insured by using electromagnetic stirring technology at end of secondary cooling zone to control inclusion
composition segregation and structure of casting slab.