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Final report on Contract No 7210-PR/046, 1 July 1997 to 31 December 2000

The primary objective of the project was to conduct a systematic evaluation of the occurrence of chloride-induced stress corrosion cracking in stainless steels, including newer steel grades for which there is less prior service experience on which to base material selection. The secondary objective was to evaluate and further develop laboratory test conditions to facilitate assessment of future materials. The main approach has been to define the limiting conditions for the occurrence of cracking, rather than quantifying the extent of cracking under given conditions as has been done in the past. Primary attention has been paid to four core alloys: the austenitic S30403 and N08904 plus the duplex steels S32304 and S31803, with other steel grades included in some investigations.

The general conclusions from this work are that:
- Stress corrosion resistance generally follows alloying level, at least within steel groups (austenitic or duplex).
- Exceptions arise particularly for the duplex steel S32304, for which an unexpectedly high stress corrosion cracking resistance in aggressive environments seems to be related to general corrosion which inhibits cracking.
- Slow strain rate testing is relatively more aggressive to duplex steels; this may be related to the mechanical-electrochemical interaction between the phases.
- The passive films formed in many chloride environments are similar and thus not related to cracking propensity.

Additional information

Authors: PETTERSON R F A, SIMR, Stockholm (SE);SCOPPIO L, CSM, Rome (IT);COUDREUSE L, Usinor Industeel, Le Creusot (FR);BERGQUIST A, AvestaPolarit, Avesta (SE);KIVISÂKK U, Sandvik Steel, Sandviken (SE);POHJANNE P, VTT (FI);AHO-MANTILLA I, VTT (FI)
Bibliographic Reference: EUR 20328 EN (2002), pp.180. Euro: 28.00
Availability: EUR-OP reference: KI-NA-20328-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3641-7
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