Weldability of 6% Superaustenitic Stainless Steel for Seawater Applications

Corrosion resistant alloy welds for seawater applications are necessary to be over-alloyed with Cr, Mo and nitrogen to have an increased Pitting Index value. The desired weld chemistry also requires less microsegregation of Cr and Mo and precipitation free microstruciure not only for higher corrosio...

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Bibliographic Details
Published inQUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 9; no. 1; pp. 154 - 160
Main Authors Ogawa, Tadao, Koseki, Toshihiko
Format Journal Article
LanguageEnglish
Japanese
Published JAPAN WELDING SOCIETY 1991
Subjects
Hot cracking
Ni based alloy
Nitrogen addition
Pitting corrosion
Seawater application
Superaustenitic stainless steel
Weld
Weld ductility
Weldment
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Summary:Corrosion resistant alloy welds for seawater applications are necessary to be over-alloyed with Cr, Mo and nitrogen to have an increased Pitting Index value. The desired weld chemistry also requires less microsegregation of Cr and Mo and precipitation free microstruciure not only for higher corrosion resistance but also for good mechanical properties and weld hot-cracking resistance. Based on such requisites for the welds, nitrogen-added Ni-based filler metal, 22Cr-60Ni-9Mo-0.1N, was developed for the welding of a 6%Mo superaustenitic stainless steel. The weldment by the newly developed filler metal showed excellent chloride corrosion resistance comparable to the base metal. The weld solidification and microstructure were fully austenitic without any other phases and brittle precipitates in the whole weld. Thereby, the weldment also offered good ductility, toughness and hot-cracking resistance superior to the weldment by the conventional Alloy 625 filler metal.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0288-4771
2434-8252
DOI:10.2207/qjjws.9.154