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Effect of nitrogen-containing shielding and backing gas on the pitting corrosion resistance of welded lean duplex stainless steel LDX 2101® (EN 1.4162, UNS S32101)

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Abstract

Factors which can have a detrimental effect on the corrosion performance of welded duplex stainless steel are discussed together with applicable countermeasures. The main focus is on pitting corrosion resistance on the root side and how this can be improved by adequate backing gas protection and post-weld cleaning (acid pickling). The positive effect of nitrogen in the shielding and backing gas on the austenite formation and pitting corrosion resistance of welds in the lean duplex stainless steel LDX 2101® (EN 1.4162, UNS S32101) is demonstrated. On the rootside, welding with nitrogen-based backing gas significantly increased the critical pitting resistance compared to welding with argon. The highest values, close to that of the base metal, were obtained using 90 % N2 + 10 % H2 as backing gas. The results are compared to the values reported in the literature and the differences between the ASTM G150 and ASTM G48 corrosion test methods highlighted.

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Acknowledgments

Henrik Ahrman and Hans-Erik Peth at Outokumpu Avesta Research Centre are acknowledged for mechanized welding and corrosion testing, respectively, and Ole Öhrn at Böhler Welding Group Nordic AB for the manual welding.

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Authors and Affiliations

  1. Böhler Schweißtechnik GmbH Austria, Böhler Welding Group, Kapfenberg, Austria

    E. M. Westin

  2. Outokumpu Stainless, Avesta Research Centre, Avesta, Sweden

    M. M. Johansson & R. F. A. Pettersson

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  1. E. M. Westin
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  2. M. M. Johansson
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  3. R. F. A. Pettersson
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Correspondence to E. M. Westin.

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Doc. IIW-2358, recommended for publication by Commission II “Arc Welding and Filler Metals.”

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Westin, E.M., Johansson, M.M. & Pettersson, R.F.A. Effect of nitrogen-containing shielding and backing gas on the pitting corrosion resistance of welded lean duplex stainless steel LDX 2101® (EN 1.4162, UNS S32101). Weld World 57, 467–476 (2013). https://doi.org/10.1007/s40194-013-0046-2

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