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  • Einfluss von mechanischer Belastungsart und von Legierungselementen auf die Empfindlichkeit niedriglegierter Stahle fur Spannungs-risskorrosion in Nitratlosung und in natronlauge

Abstract

Building components made of low-level alloyed steels are at risk when exposed at high temperature and under critical stress to media containing nitrates or alkalis - this resulting from inter-crystalline tension-crack corrosion. The type of steels affected are the C-Mn-,C-Mn-Mo- and C-Mn-Cr-Mo-varieties. 3 specified steels were used to evaluate such hazards under different stress conditions. The results show that all the samples tested for bending were unaffected by nitrate solutions but that a more complicated situation developed with exposure to sodium hydroxide solution. In this situation only the C-Mn steel was unaffected. Tensile stress produced similar results. When tested under "CERT"-conditions and when subjected to low-frequency stress both testing media tended to yield results giving rise to concern. It appears that the known disadvantageous effect in respect of the tension-crack corrosion behaviour when molybdenum is used as an alloying agent is aggravated when chromium is also present as an alloying agent. Testing of C-Mn-fine-grained steels against DIN 50915 can predict the behaviour on exposure to sodium hydroxide solution but modified techniques are required for other steels.

Additional information

Authors: SUSSEK ING G, Verein Deutscher Eisenhuttenleute (DE)
Bibliographic Reference: EUR 18465 DE (1998) 24pp.
Availability: Available fromOOPEC Sales agents
ISBN: ISBN 92-828-4659-8
Record Number: 199910895 / Last updated on: 1999-06-18
Category: PUBLICATION
Original language: de
Available languages: de