本技术报告涵盖了炼油行业关于在加氢处理反应器流出物空气冷却器（REAC）系统中使用双相不锈钢（DSS）的调查结果。美国石油学会精炼设备腐蚀与材料小组委员会（SCCM）在多次行业报告DSS REAC系统部件（包括REAC集管箱、管板间焊缝和相关管道）焊件开裂故障后，委托进行了本次调查。REAC组件焊件开裂已在SCCM文件中得到解决，包括API推荐规程932-B和API技术报告938- C、 在已发表的会议论文和材料技术研究所（MTI）发布的报告中。调查结果和先前研究的信息用于总结焊件开裂问题，并为评估DSS REAC系统部件在役焊件开裂的可能性准备方法。

This technical report covers results of a survey of the petroleum refining industry concerning the use of duplex stainless steel (DSS) in hydroprocessing reactor effluent air cooler (REAC) systems. The API Committee on Refining Equipment Subcommittee on Corrosion and Materials (SCCM) commissioned this survey after several industry reports of weldment cracking failures with DSS REAC system components, including REAC header boxes, tube-to-tubesheet welds, and associated piping. REAC component weldment cracking has been addressed in SCCM documents, including API Recommended Practice 932-B and API Technical Report 938-C, in published conference papers, and in a report issued by the Materials Technology Institute (MTI).Survey results and information from prior studies are used to summarize the weldment cracking issue and to prepare an approach for assessing the likelihood for in-service weldment cracking of DSS REAC system components.