A UNS S 32654 , A STAINLESS STEEL FOR CONDENSER TUBES
The new superaustenitic stainless steel UNS S32654 (Avesta Sheffield 654 SMO) is proposed for condenser tubes in desalination and power plants. A number of tests illustrating its corrosion resistance in a variety of chloride containing environments are being reviewed in terms of pitting, crevice corrosion and stress corrosion cracking. Relevant mechanical and physical properties are described. Health hazards and the impact on the environment are discussed as well as the cost benefits of using a stainless steel for this application.
Seawater resistance of a second generation superaustenitic stainless steel
The first generation of superaustenitic 6Mo steels like 254 SMO® has been further developed into a new steel–654 SMO®–containing very high amounts of those alloying elements most beneficial for the resistance to localized corrosion. 654 SMO is compared with other stainless steels and nickel-base alloys in tests performed in various kinds of seawater. The new steel is much superior to the 6Mo steel under all conditions investigated and compares favourably with Alloy C–276 in most tests. The most corrosive condition among those investigated represents a seawater system where aerobic and anaerobic areas exist simultaneously. 
 
 
 
Seewasserbestandigkeit einer zweiten Generation superaustenitischer, nichtrostender Stahle 
 
 
 
Die erste Generation der superaustenitischen 6Mo-Stahle, wie 254 SMO, ist zu einem neuen Stahl – 654 SMO® – weiterentwickelt worden, der sehr hohe Zusatze von Legierungselemente insbesondere mit verbesserndem Einflus auf die Bestandigkeit von Lokalkorrosion enthalt. 654 SMO wird anhand von Prufungen in verschiedenen Arten von Seewasser anderen nichtrostenden Stahlen und Nickelbasis-Legierungen vergleichend gegenubergestellt. Der neue Stahl ist dem 6Mo-Stahl unter allen gepruften Bedingungen weit uberlegen und kann sich auch in den meisten Prufungen erfolgreich mit Alloy C-276 vergleichen. Die hochsten korrosiven Prufbedingungen lagen in einem Seewassersystem mit gleichzeitig belufteten und unbelufteten Zonen vor.
Crevice Corrosion Resistance of Stainless Steels in Natural Seawater in the Temperature Range of 25 to 40 C
Abstract The influence of temperature in the range of 25 to 40 C on crevice corrosion of certain stainless steels (SSs) is studied by field tests performed in natural seawater. The increase in temp...