The hot rolling and cooling tests of low carbon steel plate were carried out by combined cooling method. The influences of cooling process, including one stage cooling, last stage cooling, two stages cooling and first stage cooling, on mechanical properties, microstructure and orientation distribution between grains were investigated. The research results indicated that yield strength and yield strength ratio of last stage cooling or two stages cooling were lower than that of one stage cooling. But the mechanism of the phenomena was different. The lower yield strength ratio of last stage cooling was resulted from larger grain size. While the ratio of two stages cooling was resulted from lower percentage of low angle grain boundary.%采用复合冷却方法进行了低碳钢板的热轧冷却试验.考察了4种冷却工艺(包括一段冷却、后段冷却、两段冷却和前段冷却)对低碳钢力学性能、显微组织和晶粒间取向差分布的影响.研究结果表明,与一段冷却相比,后段冷却或两段冷却的屈服应力和屈强比较低.但两者的影响机制不同.后段冷却的屈强比较低的原因是晶粒尺寸较大,而两段冷却的屈强比较低的原因是小角度晶界比例较低.
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