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管线钢中的MnS对管线钢的韧性、焊接性能、应力腐蚀断裂等性能都有着不可忽视的影响。以不同S含量的X80管线钢为研究对象,通过加入不同的Ti含量控制MnS的生成,使其生成Ti4C2S2。运用Factsage软件模拟计算,探讨了Ti含量对MnS析出的影响,计算得到了不同S含量下Ti4C2S2析出时的临界Ti含量。在实验室条件下,制作了不同Ti、S含量下的试样,采用SEM、EDS观察不同条件下试样中夹杂物的形貌、尺寸和成分变化。研究表明,管线钢中加入Ti合金可以使MnS转化生成Ti4C2S2,且随钢中S含量的提高其要求转化生成Ti4C2S2的Ti含量也需提高。
MnS in pipeline steel can have negligible effect on the toughness, weldability, stress corrosion cracking and other properties of pipeline steel. X80 pipeline steel with different S content was taken as the research object, the formation of Ti4C2S2 was controlled by adding different Ti content to control MnS generation. The effect of Ti content on the precipitation of MnS was investigated by Factsage software simulation calculation. The critical Ti content of Ti4C2S2 precipitated at different S contents was calculated. Under laboratory conditions, samples with different contents of Ti and S were made. The morphology, size and composition of the inclusions were observed under different conditions by SEM and EDS. The results show that adding Ti alloy into the pipeline steel can transform MnS into Ti4C2S2. With the increase of S content in the steel, the Ti content required to transform to Ti4C2S2 also needs to be increased.