材料中的杂质元素Ｓｎ、Ｓｂ、Ａｓ、Ｐｂ、Ｂｉ对材料的抗Ｈ２Ｓ腐蚀性能有很大的影响。为此，对含硫油气田井口设备（包括铸造阀体、铸造四通、锻造阀体、锻造阀盖以及锻造接头等）中的杂质元素含量水平进行了分析，并与日本输油管和天津无缝管比较，分析结果表明：早期生产的铸造井口阀体杂质元素含量波动很大，有些部件的含量极高，在制造时，根本没有有意识对杂质含量加以控制，与日本输油管和天津无缝管相比差距甚大。相对而言，锻造的阀体、阀盖和接头杂质元素含量较低，波动较小，有些元素控制的含量与天津无缝管的含量接近。根据分析结果和国内外的实际生产状况，提出了含硫气田中井口材料对有害元素总和：Ｐ＋Ａｓ＋Ｓｎ＋Ｓｂ应控制在０．０３％～０．０６％之间 The impurity elements Sn, Sb, As, Pb and Bi in the material have a great influence on the anti-H2S corrosion resistance of the material. Therefore, the content of impurity elements in wellhead equipment (including cast valve body, cast four-way valve, forged valve body, forged valve cover and forged joint) of sulfur-bearing oil and gas fields was analyzed and compared with Japanese pipeline and Tianjin seamless pipe Compared with the results of the analysis, the content of impurity elements in the cast wellhead produced in the early stage fluctuated greatly and the content of some components was very high. At the time of manufacture, there was no conscious control of the impurity content. Compared with the Japanese pipelines and Tianjin seamless pipe The gap is huge. Relatively speaking, forged valve body, bonnet and joint impurity element content is low, less volatile, and some elements of the content control and seamless pipe content in Tianjin close. According to the analysis results and the actual production status both at home and abroad, the sum of the harmful elements in the wellhead material in sulfur-bearing gas field is proposed: P + As + Sn + Sb should be controlled between 0.03% ~ 0.06%