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某气田引压管在使用过程中发生了开裂,利用光学显微镜、扫描电子显微镜、能谱分析以及化学分析方法等对开裂引压管表面形貌、横向与纵向的微观组织、腐蚀形貌、断口表面垢物化学成分进行观察与分析。结果表明,引压管的化学成分满足标准要求,微观组织为奥氏体,且沿轧制方向存在带状分布的夹杂物。引压管表面存在较多的宏观裂纹,断口微观形貌表明裂纹属于穿晶开裂,存在分叉“湖泊”状形貌,断口形貌特征为河流状的解理花样。原料气中所含的硫、氯共同作用导致引压管发生应力腐蚀开裂。
In a gas field, the pressure pipe was cracked during use. The surface morphology, horizontal and vertical microstructure, corrosion morphology and fracture of the cracked pressure pipe were analyzed by optical microscope, scanning electron microscope, energy spectrum analysis and chemical analysis methods Surface scale chemical composition for observation and analysis. The results show that the chemical composition of the piezotube meets the standard requirements. The microstructure is austenite and there are banded inclusions along the rolling direction. There are many macroscopic cracks on the surface of the pinch tube. The fracture morphology shows that the crack belongs to transgranular cracking, and the bifurcation “lake ” morphology exists. The fracture morphology is characterized by river-like cleavage patterns. The sulfur and chlorine contained in the raw material gas lead to stress corrosion cracking in the lead pipe.