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采用金相检测、透射电镜和能谱分析等方法,分析武钢CSP产线屈服强度700 MPa级别含Ti高强钢长度方向和宽度方向温度波动对钢卷中第二相TiC粒子的析出形貌和析出量的影响,发现卷取温度、带钢长度方向和宽度方向温度波动是造成含Ti高强钢强度波动的主要原因。通过优化卷取温度,层流冷却采用边部遮挡和卷后堆垛缓冷等相关措施,实现了CSP产线屈服强度700 MPa高强钢的批量生产,且产品强度稳定,性能均匀性好。
The morphology and precipitation of the second phase TiC particles in the coil were analyzed by means of metallographic examination, transmission electron microscopy and energy spectrum analysis. The results showed that the temperature of the high strength steel containing 700 MPa grade of Wuhan Iron and Steel (CSP) It is found that the coiling temperature, strip length and width direction temperature fluctuation are the main reasons for the strength fluctuation of Ti-containing high strength steel. By optimizing the coiling temperature, laminar flow cooling and adopting the measures such as edge obstruction and post-roll stacking slow cooling, the mass production of 700 MPa HSR steel with yield strength of CSP is realized, and the product strength is stable and the performance is good.