沈阳工业大学学报2012，Vol.34Issue(3)：273-281,9.
低铬X70管线钢组织及其抗CO2腐蚀性能
Microstructure and CO2 corrosion resistance of low Cr X70 pipeline steel
摘要
Abstract
In order to clarify the effect of the mass fraction of Cr element on the properties of buried pipeline steel for oil and gas transportation, four kinds of X70 pipeline steel with different mass fraction of Cr element were designed, and the microstructures and mechanical properties of the pipeline steel with different mass fraction of Cr element were studied. In addition, the CO2 corrosion tests for the experimental steel were carried out with a high temperature and high-pressure reactor. The results show that with adding 0. 1% to 0. 8 % Cr into the steel, the microstructure of the steel consists of the acicular ferrite and quasi-polygonal ferrite. The Cr element obviously distributes around the grain boundaries. With increasing the mass fraction of Cr element, the strength of the pipeline steel plate gets improved, and the distribution density of Cr element at the grain boundaries also increases. Moreover, the enrichment amount of Cr （OH）3 in the corrosion product film increases, which leads to decrease the average corrosion rate of the steel plate. Meanwhile, be＇cause Cr（OH） 3 can effectively prevent anion from penetrating the corrosion product film, the pitting corrosion caused by the catalytic action of Cl- ion reduces obviously, and thus the pitting corrosion rate of the steel plate decreases significantly.关键词
X70管线钢/Cr的质量分数/CO2腐蚀/晶粒细化/固溶分布/腐蚀产物膜/平均腐蚀速率/点蚀速率Key words
X70 pipeline steel/mass fraction of Cr element/CO2 corrosion/grain refinement/solid-solution distribution/corrosion product film/average corrosion rate/pitting corrosion rate分类
矿业与冶金引用本文复制引用
武会宾,孙锐艳,王立东,王世刚,唐荻,梁金明..低铬X70管线钢组织及其抗CO2腐蚀性能[J].沈阳工业大学学报,2012,34(3):273-281,9.基金项目
国家科技重大专项资助项目 （）
