51313-02697-Corrosion Performance of Welds in Duplex Superduplex and Lean Duplex Stainless Steels

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Product Number: 51313-02697-SG

ISBN: 02697 2013 CP

Author: Mikael Johansson

Publication Date: 2013

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To achieve good corrosion resistance in a weld is much more challenging than for plate or sheet material which has undergone controlled rolling heat treatment and pickling processes in the steel mill. The choice of weld procedure and parameters filler metal and shielding gas all play important roles. For duplex and lean duplex grades it is essential to ensure that an adequate amount of austenite is formed in the weld metal and heat affected zone in order to fulfil requirements in terms of austenite-ferrite phase balance but also to avoid the precipitation of detrimental phases such as intermetallics and nitrides. .In addition the importance of good post-weld cleaning to ensure good corrosion properties cannot be over-emphasised.

This paper focuses on a number of different examples of corrosion of welds in the duplex grades UNS S32101 UNS S32205 and UNS S32750. These include both pitting and uniform corrosion illustrating the role of microstructure control to attain good corrosion performance. The effect of residual weld oxides or heat tint in degrading the corrosion performance is also explored together with evaluation of the degree to which the corrosion resistance can be restored by the use of appropriate pickling processes.