Metallurgy those of the more familiar austenitic stainless steels. For weldingduplex stainless standard welding processes are used. Welding duplex stainless steel industry guide lasgroep regio. In addition, for duplex stainless steel welding, the ratio of ferrite to austenite may be difficult to control in the weld metal and heat affected zone. For more severe requirements, hyper duplex stainless steel grades 4 have been introduced. Welding parameters for duplex stainless steels imoa. The duplex family covers a broad range of corrosion resistance, allowing the substitution of standard stainless grades from 304 with lean duplex ur 2202. Virtually all welding processes used on austenitic stainless steels are applicable to duplex stainless steels.
Duplex stainless steels welding guidelines industeel arcelormittal. Welding welding procedures must be developed to achieve acceptable corrosion resistance and. Pdf on may 15, 20, hans astrom and others published welding of duplex stainless steel find, read and cite all the research you need on researchgate. The chromium content may be increased and other alloying elements added or adjusted to meet specific end. Except that flux cored arc welding fcaw is not recommended, especially for the super duplex grades. Duplex austenitic ferritic stainless steels comprise a large family ranging from the lower alloyed lean grades, via the widely used 22%cr grades to the highly alloyed. Chapter 1 contains general requirements for austenitic and duplex stainless steels.
Careful formulation of the weld wire composition ensures the optimum combination of weld strength and corrosion resistance, achieved by overalloying the wire with nickel to maintain the correct austenite ferrite phase balance. Pdf welding of duplex stainless steel ijsrd international. They form the current families of duplex and super duplex stainless steels, with the austeniteferrite structure in common. Welding duplex and superduplex stainless steel lasgroep regio. Pdf welding of duplex stainless steel researchgate. Duplex stainless steels consist of the two phases, ferrite and austenite and are often termed ferri ticaustenitic. Weldingduplex stainless must follow precise instructions. Ak steel nitronic 19d stainless steel is a molybdenumfree, low nickel lean duplex stainless steel. Pdf on may 15, 20, hans astrom and others published welding of duplex stainless steel find, read and cite all the research you need on. Stainless steel welding characteristics by definition, stainless steels are ironbase alloys containing 10% or more chromium, which imparts to the metal the corrosionresistant properties for which stainless steels are so highly regarded. Practical guidelines for the fabrication of duplex stainless steels. The use of both, duplex dss and superduplex sdss stainless steel, increased significantly.
The combination of strength, corrosion resistance, ease of forming and welding make ak steel nitronic 19d stainless steel a good choice in many applications. Duplex stainless steels dss have somewhat different welding requirements than ii. Ferralium 255 weld wire is produced to complement our leading super duplex stainless steel. This guide covers four chapters pertaining to materials and welding for stainless steels. For many engineering applications in the petroleum and refining in dustry, duplex stainless steels dss are the preferred material, combin. Welding of duplex and super duplex stainless steel has been subject to. Possible precipitations in super duplex stainless steels within 25 40 minutes, while 2205 is 1 hour and 2304 is 8 hours for significant precipitations. An article on spot welding duplex stainless steels was published 11 in issue 81 of practical welding letters for may 2010. In this paper, an uptodate overview of welding consumables and. A growth in sales of 22% cr duplex stainless steel in particular, has. The alloy can be used as a corrosionresistant, high.
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