• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Corrosion Engineering, Science and Technology >Failure of welded dilution steam coil made of alloy 800HT
【24h】

Failure of welded dilution steam coil made of alloy 800HT

机译：800HT合金稀释蒸汽盘管焊接失败

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The paper presents the results of a failure investigation carried out on a welded dilution steam coil made of alloy 800HT. The dilution steam coil leaked at the inlet of the convection section of an ethane cracking furnace after 11 years of service. The tube experienced cracking in the weld metal and the weld fusion zone. The failure investigation revealed that the dilution steam coil suffered from embrittlement due to sulphidation at the grain boundaries of the weld metal at the inner surface and intergranular oxidation and cracking of the heat affected and weld fusion zones at the outer surface. The internal sulphidation was ascribed to the influence of sulphur bearing species on the weld metal that was much higher in nickel content than the parent metal, while the external oxidation was attributed to the oxidising environment of the furnace atmosphere. The source of sulphur in the furnace effluent was possibly dimethyl disulphide injected into the furnace feed to prevent coke formation and carburisation of the furnace tubes.
机译：本文介绍了对由800HT合金制成的焊接稀释蒸汽盘管进行的失效研究的结果。使用11年后，稀释蒸汽盘管在乙烷裂解炉对流段的入口泄漏。管子在焊缝金属和焊缝熔合区出现裂纹。失效调查表明，稀释蒸汽盘管由于内表面焊缝金属晶界处的硫化以及外表面热影响区和焊缝熔合区的晶间氧化和破裂而发生脆化。内部硫化归因于含硫物质对焊缝金属的影响，其镍含量比母体金属高得多，而外部氧化则归因于炉内气氛的氧化环境。炉子流出物中的硫源可能是注入炉子进料中的二甲基二硫化物，以防止焦炭形成和炉管的渗碳。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号