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Dissimilar welding of super-duplex and super-austenitic stainless steels

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Abstract

Dissimilar welding of super-duplex stainless steel 2507 (UNS S32750) to super-austenitic stainless steel 6Mo (UNS S31254) was studied using nickel-alloy filler materials ERNiCrMo-13 and ERNiCrMo-3 as well as super-duplex filler material ER2594 in GTAW. It was shown that mechanical properties of the dissimilar welded joints made with nickel-alloy filler materials and super-duplex stainless steel filler meet the requirements in the related international standards. Intermetallic phases were found in the 2507 fusion line and the weld metals with nickel-alloy filler materials while intermetallic phases were observed in the 6Mo fusion line with super-duplex filler. Intermetallic phases were observed in the weld metals with super-duplex filler and shielding gas of pure Ar, but not with the same filler and shielding gas of Ar + 2%N2. The dissimilar welded joints have passed the ASTM G48A test at 45 °C made with nickel-alloy filler materials ERNiCrMo-13 and ERNiCrMo-3, at 40 °C with super-duplex filler and shielding gas of Ar + 2%N2, and at 35 °C with super-duplex filler and shielding gas of pure Ar. Based on the mechanical properties and pitting corrosion resistance of the dissimilar welded joints of 2507 to 6Mo, the filler material can be ERNiCrMo-13 as the first choice, ERNiCrMo-3 as the second choice and super-duplex filler ER2594 together with shielding gas of Ar + 2%N2 as the third.

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Acknowledgements

The technical assistance of Mr. S. Ögren and Mrs. Östberg is gratefully acknowledged. Discussions with Mrs. M. R. Frodigh are much appreciated.

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Authors and Affiliations

  1. Sandvik Materials Technology, 811 81, Sandviken, Sweden

    Zhiliang Zhou & Johan Löthman

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  1. Zhiliang Zhou
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  2. Johan Löthman
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Correspondence to Zhiliang Zhou.

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Recommended for publication by Commission II - Arc Welding and Filler Metals

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Zhou, Z., Löthman, J. Dissimilar welding of super-duplex and super-austenitic stainless steels. Weld World 61, 21–33 (2017). https://doi.org/10.1007/s40194-016-0408-7

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  • DOI: https://doi.org/10.1007/s40194-016-0408-7

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