HTR-PM SG换热管异种钢焊接研究

Mingtao Zheng, Li Wang
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引用次数: 0

摘要

模块化高温气冷堆核电站具有固有安全性、系统简单、发电效率高、应用广泛等优点。高温气冷堆(HTR-PM)蒸汽发生器采用Incoloy800H和2.25Cr-1Mo换热管。蒸汽发生器采用Incoloy800H和2.25Cr-1Mo换热管,将高温氦介质转化为水介质。设计了Incoloy800H与2.25Cr-1Mo换热管之间的异种钢焊缝。高温pm蒸汽发生器换热管外径小、厚度大、设计结构复杂。两种换热管之间采用异种钢焊接,焊接操作空间有限,焊缝质量要求高。在高温pm蒸汽发生器运行过程中,Incoloy800H换热管、2.25Cr-1Mo换热管以及Incoloy800H与2.25Cr-1Mo换热管之间的异种钢焊缝在高温环境中长期工作,直至蒸汽发生器失效。对异种钢焊缝的表面成形质量、常规性能和高温应力断裂性能提出了要求。Incoloy800H和2.25Cr-1Mo换热管异种钢焊缝的质量直接关系到蒸汽发生器的安全运行。通过对管对管接头类型、焊接材料、焊接参数、热处理工艺等方面的系统研究。结果表明,采用合适的GTAW工艺和镍基合金消耗性刀片,焊接接头可以满足严格的内、外表面成形质量、常规性能和HTR-PM蒸汽发生器使用环境中应力断裂试验强度等所有设计要求。该工艺已应用于示范项目的产品制造,为行业内类似应用场景提供了良好的示范经验。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research of Dissimilar Steel Welding for HTR-PM SG Heat Exchange Tube
The modular High-Temperature Gas-Cooled Reactor nuclear power plant has inherent safety, simple system, high power generation efficiency and wide use. Incoloy800H and 2.25Cr-1Mo heat exchange tubes are used for High-Temperature Gas-Cooled Reactor (HTR-PM) Steam Generator. The steam generator uses the Incoloy800H and 2.25Cr-1Mo heat exchange tubes to transfer the high temperature helium medium to the water medium. The dissimilar steel welds are designed between Incoloy800H and 2.25Cr-1Mo heat exchange tubes. The heat exchange tubes of HTR-PM Steam Generator with small OD, large thickness, and design structure complicated. The dissimilar steel welds between two kinds of heat exchange tubes with limited welding operation space and welding seam quality requirements high. During the HTR-PM Steam Generator operation process, Incoloy800H heat exchange tube, 2.25Cr-1Mo heat exchange tube and the dissimilar steel welds between Incoloy800H and 2.25Cr-1Mo heat exchange tube are service in high temperature environment for a long time, until the steam generator fails. The surface forming quality, conventional properties and high temperature stress-rupture of dissimilar steels weld is required. The quality of dissimilar steel weld of Incoloy800H and 2.25Cr-1Mo heat exchange tubes is directly related to the safe operation of steam generator. Through systematic research including tube-to-tube joint type, the welding material, welding parameters, heat treatment process etc. The results show that using appropriate GTAW process with Nickel base alloy consumable inserts, welded joints can meet all design requirements such as strict inner and outside surface forming quality, conventional performance and the strength of stress-rupture test in HTR-PM Steam Generator service environment. This process has been used in the product manufacturing of demonstration projects, and provides good demonstration experience for similar application scenarios in the industry.
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