运用四点弯曲试验方法,参照NACE 0177-2005标准研究了低Cr钢在模拟塔罩木油田工况条件下的抗H_2S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, H_2S stress corrosion cracking(SSC)behavior of low Cr steels in the simulated environments of Tarim oilfield was studied with four-point bent test. The re-sults 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.
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