Abstract: 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.

摘要： 通过扫描电镜对280 mm×380 mm连铸坯生产的SWRH82B钢盘条(%:0.80～0.84C、0.75～0.85Mn、0.18～0.22Cr、0.015～0.035Al)冷拔断裂的断口显微组织和成分进行观察和能谱分析,得出碳的富集、氧化物、硫化物夹杂和显微空洞是冷拔盘条断裂源。采用二冷区末端电磁搅拌等技术控制连铸坯夹杂物、成分偏析和组织,可保证SWRH82B钢盘条冷拔质量。

关键词: SWRH82B钢, 铸坯, 碳偏析, 夹杂物, 盘条冷拔断裂