2205双相不锈钢在大牛地气田的耐蚀性能研究

Research on Corrosion Resistance of 2205 Duplex Stainless Steel in Daniudi Gas Field

采用SSRT进行不同速率的试验,对2205双相不锈钢在模拟大牛地气田环境下的耐应力腐蚀性能进行研究。计算了腐蚀敏感性,利用扫描电镜对断口形貌进行观察。结果表明:2205双相不锈钢应力敏感系数分布在安全区内。断口形貌特征为韧窝,其变大变浅,但仍旧为穿晶韧性断裂,所以2205双相不锈钢在大牛地气田可安全应用。

The stress corrosion resistance of 2205 duplex stainless steels in simulate corrosion environment of Daniudi gas fields was studied by slow strain rate testing（SSRT） at different strain rates. The stress corrosion cracking（SCC）susceptibility was calculated, the morphology of fracture was observed by scanning electron microscope（SEM）. The results show that the steel sensitive coefficient of 2205 duplex stainless steels is within the safe range. The feature of fracture morphology is dimple, and the dimple tends to be shallower and bigger, but the sample is remains transgranular toughness fractures. So 2205 duplex stainless steels could be safely used in Daniudi gas fields.