TP321不锈钢临氢管道焊接探讨

Discussion of Welding for Hydroforming TP321 Stainless Steel Pipe

以渣油加氢装置为例,在含硫及其他杂质较高的劣质原油加工工艺中,探讨H_2S、H_2对原材料、焊缝及热影响区腐蚀破坏的机理。通过实践摸索总结出在特定生产工艺条件下,选用超低碳不锈钢、窄焊缝、小电流、多层多道焊、水循环法控制焊接层间温度、对焊缝进行特殊的稳定化热处理的施工工艺,很好地满足了在特殊操作环境下对焊接接头的防腐蚀需求,为临氢不锈钢管道焊接施工积累了丰富的经验。

With the example of residuum hydrogenation plant, the influences of H2S and H2 to the raw material and weld joint as well as the mechanism of corrosion failure in the refining process for the raw oil containing sulfa and other impurities were discussed. In practice, the construction process under the specific condition was summarized, including the selection of material with super low carbon stainless steel, narrow weld seam, small electric current, muhi layers welding process, the control of the temperature between welding layers by using water cycle method and the stability heat treatment for weld seam. By using this process, the anticorrosion requirement for welding joint under specific operating condition has been fulfilled, and the abundant experience for the construction of hydroforming stainless steel piping has also been accumulated.