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本文主要研究了12SiMoVNbAl低合金钢耐含硫原油长期高温腐蚀的锈层之组织结构。用金相及岩相方法观察了锈层的组织结构。锈层主要分里、外两层。里层致密,外层疏松。用电子探针及扫描电镜观察并测定了合金元素在基体金属和锈层中的分布。该钢合金元素含量虽然较低,但仍具有较好的抗高温腐蚀的性能。硅、铝等合金元素在里锈层中的富集是提高其抗高温腐蚀性能的主要原因。
In this paper, we mainly study the microstructure of 12SiMoVNbAl low alloy steel which is resistant to long-term high temperature corrosion of sulfur-bearing crude oil. The metallographic and petrographic methods were used to observe the microstructure of the rust layer. The rust layer is mainly divided into two layers. The inner layer is dense and the outer layer is loose. Electron probe and scanning electron microscope were used to observe and determine the distribution of alloying elements in the matrix metal and rust layer. Although the content of alloying elements in steel is low, it still has better performance of high temperature corrosion resistance. The enrichment of silicon, aluminum and other alloying elements in the rust layer is the main reason to improve its high temperature corrosion resistance.