CSP工艺冷轧薄板组织演变和第二相分析  

Microstructure Evolution and Second Phase Analysis of Cold Rolled Thin Steel Strip Produced by CSP Process

作　　者：计云萍[1] 任慧平[1] 金自力[1] 李德刚[2] 闫波[1,2] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]包钢集团薄板坯连铸连轧厂,内蒙古包头014010

出　　处：《钢铁》2010年第1期74-78,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(50761005);内蒙古自治区高等学校科学研究项目(NJ06081)

摘　　要：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 evolution of cold rolled thin steel strip produced by CSP process was studied by metallographic 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 annealing is finer than that of the steel strip center and this phenomenon is more obvious during CSP hot rolling than during 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 M3 C and nano-sealed MC. The amount of nano-scaled M3C in annealed thin steel strip is about 26 times more than that of nano-scated MC in annealed thin steel strip.

关 键 词：CSP薄板坯 冷轧 退火 第二相 

分 类 号：TG331[金属学及工艺—金属压力加工]