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对X80管线钢进行了层流冷却过程的建模分析,考察了潜热对冷却曲线的影响,并分析了板厚、轧辊速度和终轧速度对X80管线钢中间温度、冷却速度和终冷温度的影响,在最优化工艺参数下对X80管线钢进行了轧制处理。结果表明,X80管线钢在考虑相变潜热前提下的优化工艺为轧辊速度2.5~3.0 m/s,终轧温度860~880℃,并在此工艺下进行了控制轧制和控制冷却的工艺实践;无论是传统工艺还是优化工艺下的X80管线钢的力学性能都符合APISL-2009标准的要求,但是优化工艺下的X80管线钢的综合性能明显要更优;经过优化工艺处理后的X80管线钢的组织为多边形铁素体+粒状贝氏体。
The modeling and analysis of laminar cooling process of X80 pipeline steel were carried out. The influence of latent heat on the cooling curve was investigated. The effects of plate thickness, roll speed and finishing speed on the intermediate temperature, cooling rate and final cooling temperature of X80 pipeline steel Influence, under the optimum process parameters X80 pipeline steel was rolled. The results show that the optimum process of X80 pipeline steel is 2.5 ~ 3.0 m / s roll speed and 860 ~ 880 ℃ final rolling speed, considering the latent heat of phase transformation. The process of controlled rolling and controlled cooling are carried out in this process . The mechanical properties of X80 pipeline steel under both traditional and optimized processes meet the requirements of APISL-2009 standard, but the overall performance of X80 pipeline steel under optimized process is obviously better. The optimized X80 pipeline steel The organization of polygonal ferrite + granular bainite.