316L/X65复合管管端的耐腐蚀性研究
Research on Corrosion Resistance of 316L/X65 Composite Lined Pipe End
汪建明 1曾庆杨 1周声结 2黄锦圳 1陈大江 2梁德炽 2王文龙2
作者信息
- 1. 南方海洋科学与工程广东省实验室(湛江), 广东 湛江 524002
- 2. 中海石油(中国)有限公司湛江分公司, 广东 湛江 524057
- 折叠
摘要
对油气管道用316L/X65 双金属机械复合管管端进行了微观组织分析、成分分析及晶间腐蚀、点腐蚀测试.结果表明,复合管的化学成分符合条件,性能都满足要求.复合管管端堆焊层分为内外两层,Inconel625 堆焊层组织主要为奥氏体组织,外层相比内层晶粒更细小,因内层堆焊层的阻隔作用,外层堆焊层没有受到X65 基管的影响,保持了良好的耐蚀性能,复合管管端晶间腐蚀测试符合工程应用要求,耐点蚀性能由低到高的顺序为 316L-Inconel625 焊接区＜316L衬管＜Inconel625堆焊层,温度升高显著降低管端的耐点蚀性能.316L衬管与Inconel625 堆焊层之间的焊接区因电偶作用,使得316L更易发生腐蚀.
Abstract
The microstructure analysis,composition analysis,intercrystal corrosion and point corrosion tests were conducted on 316L/X65 composite lined pipe end for oil and gas pipeline.The results show that the chemical composition of the composite pipe is qualified.The performance indicators are all qualified.The welding layer is divided into two layers,the microstructure of the weld zone is mainly austenite and the crystalline grain of outer layer is smaller than that of the inner layer.Due to the barrier of the inner layer,the outer layer is not effected by X65 substrate,which ensures good corrosion resistance.Pitting corrosion resistance from low to high order is 316L-Inconel625 weld zone<316L liner<Inconel625 welded layer,increasing temperature significantly reduces the point corrosion resistance of the pipe end.Because of electric coupling,the welded joint between the 316L lined pipe and Inconel625 pile welding layer makes 316L be prone to corrosion.
关键词
机械复合管/管端/Inconel/625/点蚀Key words
composite lined pipe/pipe end/Inconel625/pitting corrosion引用本文复制引用
基金项目
南方海洋科学与工程广东省实验室(湛江)资助项目(ZJW-2019-04)
出版年
2024
NETL
NSTL
万方数据