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首页> 外文期刊>Materials Technology: Advanced Performance Materials >Titanium and super stainless steel welded tubing solutions for sea water cooled heat exchangers
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Titanium and super stainless steel welded tubing solutions for sea water cooled heat exchangers

机译：海水冷却热交换器的钛和超不锈钢焊接管解决方案

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摘要

Owing to its outstanding resistance to general and localised corrosion, titanium has become established as the preferred material for sea water cooled heat exchanger tubing, be it for power plant surface condensers or heat exchangers in thermal desalination plant or in the chemical and petrochemical processing industry. Periodic increases in the price of titanium have generated interest in cost effective alternatives using so called 'super alloys': highly alloyed stainless steels showing improved corrosion resistance over conventional compositions. Taking sea water cooled power plant condenser tubes as an example, the mechanical and corrosion/erosion properties of titanium are reviewed together with those of three frequently considered alternatives, UNS S31254 super austenitic alloy, and UNS S44735 and S44660 super ferritic alloys. The results of ASTM G48 pitting and crevice corrosion tests and of electrochemical studies in model sea waters are reported. The effect of heat treatment on the corrosion resistance of S44735 has also been examined. It is concluded that while titanium has a superior balance of corrosion and other properties, super alloys can provide excellent performance in service provided certain precautions are observed.
机译：由于其出色的抗一般腐蚀和局部腐蚀的能力，钛已成为海水冷却热交换器管材的首选材料，无论是用于热淡化厂或化学和石化加工行业中的电厂表面冷凝器或热交换器的钛。钛价格的定期上涨已引起人们对使用所谓的“超级合金”的具有成本效益的替代品的兴趣：高度合金化的不锈钢显示出比常规成分更高的耐腐蚀性。以海水冷却的发电厂冷凝器管为例，对钛的机械和腐蚀/侵蚀性能以及三种常用的替代品（UNS S31254超级奥氏体合金以及UNS S44735和S44660超级铁素体合金）进行了综述。报告了ASTM G48点蚀和缝隙腐蚀试验的结果以及在模型海水中进行的电化学研究的结果。还研究了热处理对S44735耐腐蚀性的影响。结论是，尽管钛具有优异的腐蚀和其他性能平衡，但只要遵守某些预防措施，超级合金可以在使用中提供出色的性能。

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