The Influence of Metallurgical Aspects on the Pitting Corrosion Behaviour of High Alloy Stainless Steels

Rockel, Manfred B.; Wallis, E.; Wincierz, P.

doi:10.1016/b978-0-08-029358-5.50035-5

Cited by 1 publication

(1 citation statement)

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“…Since earlier work with stainless steels and nickel alloys had shown [2] that pitting resistance improved with Cr and Mo content, it was reasonable to assume a correlation between "pitting resistance equivalent" (PRE) and the CPT data. Fig.…”

Section: Pitting Corrosionmentioning

confidence: 99%

Pitting, Crevice and stress corrosion resistance of high chromium und molybdenum alloy stainless steels

Rockel

Renner

1984

Materials & Corrosion

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This paper presents new data on the resistance of recently developed high-alloy stainless steels to localised corrosion in chloride solutions. Pitting potential was determined in artificial sea water, and critical pitting temperature CPT in very aggressive F e Q solution. Critical crevice corrosion temperature CCT was tested in the same FeCl, solution. Stress corrosion measurements, made in a more familiar NaCl solution by the drop evaporation method, demonstrate that alloy stainless steels with high chromium and molybdenum have very long failure times, comparable with those of nickel alloys found to be SCC-resistant under practical conditions. Stainless steels of 20 Cr 25 Ni 6Mo type showed the best resistance to localised corrosion.Es werden neuere Ergebnisse iiber die Bestandigkeit der weiterentwickelten hochlegierten CrNiMo-Stahle gegeniiber Lokalkorrosion in stark chloridhaltigen waBrigen Medien vorgelegt. Es wurden die LochfraBpotentiale in kunstlichem Meerwasser sowie die kritischen LochfraR-und Spaltkorrosionstemperaturen in der aggressiven 10% FeC1,-Losung ermittelt. SpannungsriR-Korrosionspriifungen mittels auftropfender NaC1-Losung auf den erhitzten Werkstoff (Drop Evaporation Test) zeigen, daR sehr hoch in Chrom, Molybdan und Nickel legierte nichtrostende Stahle hohe Standzeiten aufweisen, die mit solchen Nickellegierungen vergleichbar sind, die sich in der Praxis als bestandig gegeniiber SpannungsriBkorrosion erwiesen haben. Der nichtrostende Stahl mit 20 Cr 25 Ni 6 Mo (1.4529) zeigt die beste Bestandigkeit gegeniiber allen Lokalkorrosionsarten.

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Section: Pitting Corrosionmentioning

confidence: 99%