采用实验室热轧、显微分析及力学性能检测手段,对Nb-Mo及Nb微合金化X100管线钢在不同工艺条件下的组织特征及力学行为的变化规律进行了研究。分析结果表明：工艺参数对Nb-Mo复合成分试验钢影响较大，控轧控冷工艺条件下Nb-Mo及Nb微合金化X100管线钢力学性能均能达到API 5L中X100管线钢要求，但Nb-Mo复合成分力学性能富余量较大，性能较优。随冷却速度的增加及终冷温度的降低，试验钢强度增加，韧性及塑性恶化。板条马氏体与贝氏体复相组织较板条马氏体可大大提高试验钢的塑性及低温冲击韧性。
Microstructure characteristics and mechanical properties of Nb-Mo and Nb micro-alloying X100 pipeline steels in a different processing were investigated by means of experimental mill, optical microssope (OM) and transmission electron microscopy (TEM) and universal tensile testing machine and impact testing machine. The results show that it is more obviously for the Nb-Mo alloying steel affected by processing parameters. The mechanical properties of the Nb-Mo and Nb micro-alloying steel in controlled rolling and controlled cooling is up to the standard of API 5L, while the mechanical properties of the Nb-Mo alloying steel is better. With increasing cooling rate and decreasing finished cooling temperature, the strength is enhanced, while the plasticity and toughness is deteriorated. Comparing with the steel with lathed martensite, the plasticity and low temperature toughness of the tested steel with dual phase of lath martensite and bainite is increased.
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