AnlaB der Untersuchungen war das Versagen von Abhangern aus austenitischem Niro-Stahl einer Betonunterdecke in einem Hallenbad in Uster (Schweiz). Untersucht wurden hochlegierte nichtrostende Stahle bei definierten mechanischen und umweltrelevanten Belastungen. Dazu wurden in einer Versuchsreihe Salzspots an BUgelproben aufgebracht und bei 40 "C und 35 bzw. 70 % rel. Feuchte ausgelagert. In einer Spannungsriss-Priifanlage wurden zugbelastete Rundproben bei den selben Temperatur-und Feuchtigkeitsbedingungen untersucht. Die beste Korrosionsbestandigkeit zeigen die hochstickstoffhaltigen Stahle 1.4529 und 1.4565. Den grijBten Korrosionsangriff erlitten die Stahle 1.4401, 1.4462 und 1.4539. Spannungsrisskorrosion (SpRK) konnte metallographisch nur an den Stahlen 1.4401 und 1.4462 bei 35 % rel. Feuchte nachgewiesen werden. Ein Zusammenhang zwischen Wirksumme der Stahlzusammensetzung und Korrosionserscheinung ist deutlich zu erkennen.The work was started on the occasion of failures of stainless steel components at the indoor swimming pool atmosphere in Uster (Switzerland). Highly-alloyed stainless steels were tested at defined mechanical and environmental conditions. Therefore U-bend specimens with salt spots were examined at 40°C and 35 and 70% rel. humidity respectively. A further test series was realised with round specimens under constant load in a stress cracking testing system at the same temperature and humidity conditions.The highly-nitrided steels 1.4529 and 1.4565 showed the best corrosion resistance. The steels 1.4401, 1.4462 and 1.4539 incured the highest corrosion attacks. Stress corrosion cracking (SCC) was determined at the steels 1.4401 and 1.4462 at 35 % rel. humidity by metallographic structure micrography only. A distinctive relationship was observed between the pitting resistance equivalent and the kind of corrosion attack.
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