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通过热模拟实验的方法研究了合金元素C、Mo、Nb含量对X100管线钢带的微观组织和显微硬度的影响。结果表明,随着C、Mo、Nb含量增加,实验钢显微组织中的板条贝氏体比例增加,显微硬度明显提高。但是,C、Mo含量较高时,钢中的马氏体/奥氏体(M/A)组元含量增加,尺寸增大。通过对碳当量的讨论得出,X100热轧钢带的合金设计应该综合考虑各种合金元素的影响,碳当量最好能控制在0.55附近。最后针对X100热轧钢带提出了一个优化的成分范围。
The effects of C, Mo and Nb alloying elements on microstructure and microhardness of X100 pipeline steel strip were investigated by means of thermal simulation. The results show that with the increase of C, Mo and Nb contents, the proportion of bainite in the microstructure increases and the microhardness obviously increases. However, when the content of C and Mo is higher, the content of martensite / austenite (M / A) in the steel increases and the size increases. Through the discussion of carbon equivalent, it is concluded that the alloy design of the X100 hot-rolled steel strip should comprehensively consider the influence of various alloying elements, and the carbon equivalent is preferably controlled around 0.55. Finally, an optimized composition range for X100 hot-rolled strip was proposed.