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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M3C型和MC型析出物。冷硬板退火后M3C型析出物的总量比MC型析出物的总量多26～27倍。
The microstructure and microstructure evolution of CSP cold-rolled sheet steel were investigated by metallographic microscope and QUANTA-400 environmental scanning electron microscope. The chemical composition and X-ray small angle scattering method were used to study the composition of the second phase , The number and size distribution. The results show that the amount of compound inclusions in the CSP thin slab of Baotou Steel is very small. In the CSP process of cold-rolled sheet production, hot-rolled plate, cold-rolled sheet and annealed sheet along the width of the edge of the organization are smaller than the central organization, and hot-rolled state most obvious. The total amount (mass fraction) of stable oxide inclusions in the CSP hot-rolled sheet as a cold-rolled base material is only about 14.3 × 10 -6. The precipitated phases in cold and annealed sheets are mainly nanocrystalline M3C and MC-type precipitates. The total amount of M3C-type precipitates after cold-plate annealing is 26-27 times more than the total amount of MC-type precipitates.