研究了X120管线实验钢的抗H2S氢致裂纹敏感性。用多功能金相显微镜对X120管线实验钢非金属夹杂物进行颗粒度分析，用场发射扫描电子显微镜(SEM)及能谱仪(EDS)观察和分析裂纹形貌和裂纹内夹杂物。结果表明：X120管线实验钢氢致开裂一般都从非金属夹杂物处萌生扩展，并互相交叉连接；实验钢中B类夹杂物较D类夹杂物易于形成长条型裂纹，且B类夹杂物级别越高，其HIC敏感性越大； X120管线钢中S、Al含量越高，其夹杂物级别越高，非金属夹杂物数量越多，氢致开裂敏感性也越大。
The ever-increasing demand for petroleum and natural gas, requires high strength pipeline steels for transportation. In the transporting process, the hydrogen induced cracking (HIC) on the pipeline steels in a H2S environment is the main reason to cause corrosion problems and technical problems. For this reason, it is necessary to study the HIC phenomenon in high strength pipeline steels. The HIC sensitivity，of the experimental X120 high strength pipeline steel was tested, the nonmetallic inclusions in the X120 pipeline steel was studied by using a multifunctional microscope, and the cracks formed by HIC were analyzed by SEM and EDS. The results show that the cracks usually initiate and extend at the boundaries between nonmetallic inclusions and the base metal, and connect with each other; long cracks are more easily formed near the B type inclusions than near the D type inclusions; larger contents of the S and Al in the X120 pipeline steel, higher grade of the inclusions, and larger amount of the nonmetallic inclusions, lead to higher HIC sensitivity.
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