【摘要】 针对用34Mn2VN钢生产非调质N80级石油套管冲击韧性偏低的问题,在动态相变规律研究的基础上进行了不同轧制工艺参数的热模拟实验,分析了工艺参数对34Mn2VN钢组织演变规律及冲击韧性的影响。通过优化工艺参数,将终轧温度控制为850℃,轧后冷速为0.8~1.5℃/s,在包钢180机组上稳定生产出高质量的非调质N80级石油套管。结果表明,不经在线正火,能稳定生产符合API SPEC 5CT第七版标准的非调质N80级石油套管,显著提高产品的冲击韧性,并实现节能降耗。更多还原

【Abstract】 Based on the dynamic phase transformation theory, the thermal simulation rolling tests with different parameters have been performed for 34Mn2VN to enhance impact toughness and the effect of processing parameters on microstructure and impact toughness was studied.Non quenched and tempered N80 oil casings of high quality have been produced on existing 180 production line at Baotou Iron and Steel(Group) Co.Ltd by optimizing processing parameters in which the finish rolling temperature is 850 ℃ and the cooling rate after rolling is 0.8～1.5 ℃/s.The results indicate that non quenched and tempered N80 oil casings produced meet the requirements of API SPEC 5CT seventh edition with improved impact toughness.更多还原