中文摘要：

运用四点弯曲试验方法，参照NACE0177—2005标准研究了低Cr钢在模拟塔里木油田工况条件下的抗H2S应力腐蚀开裂（SSC）行为．结果表明：经720小时试验后，0．5Cr试样表面未发现宏观及微观裂纹，表现出良好的抗SSC能力，而普通3Cr、5Cr试样表面均发现宏观及微观裂纹，没有通过抗SSC性能检测；应从成分设计及适当的热处理等方面着手，获得理想的显微组织，来提高3Cr、5Cr钢的抗SSC性能．

英文摘要：

Conferring to NACE TM0177-2005 standard, H2S stress corrosion cracking （SSC） behavior of low Cr steels in the simulated environments of Tarim oilfield was studied with four-point bent test. The results show that no macroscopic and microscopic surface cracks are observed on steel specimens with 0. 5 Cr after 720-hour test duration,which presents that the steel with 0. 5 Cr has favorable SSC resistance. While to the common steels with 3 Cr and 5 Cr, there exist obviously macroscopic and microscopic cracks on the specimen surfaces, and 3 Cr and 5 Cr steels possess an inferior SSC resistance. In order to enhance the resistance to SSC of the steels with 3 Cr and 5 Cr, heat treatment and compositional design should be done to obtain the ideal microstructure.