为了对比国产和进口抗硫管在模拟工况低 H2S含量环境下的腐蚀性能及抗开裂敏感性,采用高温高压失重法和应力腐蚀开裂四点弯曲加载法,并结合扫描电镜、能谱以及X射线衍射分析技术对80钢级国产钢管、80钢级进口钢管和95钢级进口钢管进行了试验研究,从而为油气田实际选材提供理论依据。结果表明:在低温低H2S分压环境下,材料成分中铬、钼和镍元素对提高抗硫钢耐蚀性效果不明显,三种材料的力学性能相当;80钢级国产钢管和95钢级进口钢管存在带状组织,带状组织对耐蚀性有一定的影响作用;温度在80℃以下变化时,三种材料的平均腐蚀速率变化不大;三种管材均有较低的开裂敏感性。在此模拟环境下,国产抗硫管与进口抗硫管的性能相当,可以替换使用。

The corrosion behavior and stress corrosion cracking(SCC)of three domestic and imported sulfur-resistant tubes were analyzed by high temperature and high pressure coupon test,SCC test,SEM,EDS and XRD,these results will be helpful for material selection of oil and gas field.The results indicated that the element of Cr,Mo and Ni which improved the corrosion performance had not obvious superiority at the lower temperature and H2Spartial pressure.The mechanical properties of three kinds of materials had slight variety.The domestic sulfur-resistant tube of 80steel had more webbing than the imports of 80steel,the imports of 95steel also had webbing.The webbing had some influence on corrosion resistance.The average corroison rate of three kinds of materials hadslight variety under 80℃.Three sulfur-resistant tubes had lower crack sensibility.The corrosion capability ofdomestic sulfur-resistant tube was equivalent to the import tube under simulated environment,the domestic tubescan replace the import tubes.