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为了优化低钢级管线钢的成分设计,降低制造成本,采用低轧制温度、大压下量和轧后快速冷却的TMCP热机械轧制工艺,以及Mn+Nb/Ti微合金的成分设计对不同厚度L290M/X42M管线钢的化学成分进行了优化,并对试制的管线钢进行了力学性能和显微组织分析。试验结果表明,不同化学成分设计的管线钢都具有较高的强度和良好的塑性,性能指标不仅能满足GB/T14164标准要求,而且已达到了API SPEC 5L标准规定的L320M/X46M级别管线钢的强度与塑性。
In order to optimize the composition design of low-grade pipeline steel and reduce the manufacturing cost, TMCP thermo-mechanical rolling process with low rolling temperature, large reduction and rapid cooling after rolling, and the composition design of Mn + Nb / Ti microalloying The chemical composition of L290M / X42M pipeline steel with different thickness was optimized, and the mechanical properties and microstructure analysis of the pipeline steel were made. The test results show that the pipeline steel with different chemical composition has high strength and good plasticity. The performance index can not only meet the requirements of GB / T14164 standard, but also meet the requirements of API SPEC 5L standard L320M / X46M grade pipeline steel Strength and plasticity.