采用金相显微镜和QUANTA-400型环境扫描电子显微镜研究了包钢CSP工艺冷轧薄板生产过程中的组织演变,用化学相分析及X射线小角散射法研究了不同状态钢板中第二相的成分、数量及粒度分布.结果表明:包钢CSP薄板坯中复合夹杂物的数量极少.在CSP工艺冷轧薄板生产过程中,热轧板、冷硬板和退火薄板沿宽向边部的组织均较中部的组织细小,且热轧状态下最为明显.作为冷轧基料的CSP工艺热轧板中稳定氧化物夹杂的总量(质量分数)仅约14.3×10~(-6).冷硬板和退火薄板中的析出相主要为纳米级的M_3C型和MC型析出物.冷硬板退火后M_3C型析出物的总量比MC型析出物的总量多26～27倍.
The microstructure evolution of cold rolled thin steel strip produced by CSP process was studied by metal-lographic microscope and QUANTA-400 environmental scanning electronic microscope. At the same time, the chemical composition, quantity and particle size distribution of second phases in different state steel strips were in-vestigated by chemical phase analysis and SAXS method with a 3014 X-ray diffracto-spectrometer and a Kratky small angle scattering goniometer. The results show that the quantity of duplex impurity in CSP thin slab is minute. The crystal grain size of the steel strip edge along the width direction during CSP hot rolling, cold rolling and annea-ling is finer than that of the steel strip center and this phenomenon is more obvious during CSP hot rolling than dur-ing other processes. The CSP hot rolled strip for cold rolling has only about 0. 00143 percent of oxide inclusions. The precipitated phases in cold rolled and annealed thin steel strip are nano-scaled M_3C and nano-scaled MC. The amount of nano-sealed M_3C in annealed thin steel strip is about 26 times more than that of nano-scaled MC in an-nealed thin steel strip.
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