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对传统X80管线钢进行在线配分热处理,得到一种新型的含有贝氏体+M/A双相组织的大变形管线钢。采用力学性能测试、显微组织分析等方法研究了终冷温度对双相大变形管线钢的力学性能的影响。结果表明:随终冷温度的升高,贝氏体的含量降低,M/A的含量增加,实验钢的强度、硬度、冲击韧度和屈强比呈下降趋势;断后伸长率和均匀伸长率呈现增加的趋势。在终冷温度为350℃时,实验钢具有较高的强度、韧性和变形能力。
The traditional X80 pipeline steel on-line heat treatment points to get a new bainite + M / A duplex structure of large deformation of pipeline steel. The mechanical performance test and microstructure analysis were used to study the influence of the final cooling temperature on the mechanical properties of large deformation pipeline steel. The results show that with the increase of final cooling temperature, the content of bainite decreases and the content of M / A increases. The strength, hardness, impact toughness and yield ratio of the experimental steel decrease. The elongation and even elongation The growth rate shows an increasing trend. In the final cooling temperature of 350 ℃, the experimental steel with high strength, toughness and deformation capacity.