运用四点弯曲试验方法,参照NACE 0177-2005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,0.5 Cr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3 Cr、5 Cr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3 Cr、5 Cr钢的抗SSC性能.
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 fourpoint bent test.The results show that no macroscopic and microscopic surface cracks are observed on steel specimens with 0.5 Cr after 720hour 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.
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