DUPLEX WORLD CONFERENCE & EXPO 2026
Duplex World Conference, 6 May
Conference & Expo
09.45 Welcome from Conference Chairman, Dr Talal Al Nabhani, Material and Integrity Manager, Petroleum Development Oman
10.00 Keynote: Structural duplex stainless steel- a solution for modern infrastructure challenges. Nancy Baddoo, Associate Director, The Steel Construction Institute
10.30 Keynote: Building resilient maintenance supply chains with digital inventory and on-demand manufacturing. Martin Andersson, Chief Operating Officer, Fieldnode
11.00 – 11.30 Coffee break ROOM 1 ROOM 2
11.30 Corrosion 11.30 Duplex applications
Moderator: Dirk Engelberg Moderator: Rodney Rice
This session examines how duplex and super duplex stainless steels perform in harsh chloride-rich environments, from high-salinity water to marine exposure. Speakers will present new insights into crevice and pitting corrosion behaviour, linking lab data and field results to real-world material selection and application.
• Crevice corrosion resistance of 25Cr super duplex stainless steel in high salinity produced water. Vegard Bakkene Aasen, Equinor
• Duplex stainless steel in the marine environment: from field exposure test to application. Mia Liimatainen, Outokumpu
• Pitting corrosion resistance of as-delivered surface duplex 2205. Florent Krajcarz, Aperam
14.00 Panel discussion: Securing cost-effective testing requirements of duplex stainless steels in tune with technical applications
Panellists:- Mark van den Broek, Fellow- Materials & Welding, Fluor- Hans Martin Jahren, Leading Advisor Metallic Materials & Welding,
Equinor- John Houben, Principal Welding & Surface Modification Engineer,
ExxonMobil
An interactive discussion of the most common quality requirements for duplex materials and welding. Quality and cost go hand in hand, but are standards always critical, or should they sometimes be re-evaluated to simplify technical specifications?
The session will start with a short presentation by Nitin Bajpai from Fluor.
Topics covered will include:
• Key requirements from common standards and practices.
• The rationale for requirements that are poorly understood.
• Impact of choice on cost and schedule to compliance.
• When to apply or exclude specific requirements.
• Welding processes and consumable selection.
• Implications of forming and heat treatment of components.
2026
Explore the practical realities of deploying duplex stainless steels in demanding industrial environments, from oil & gas to chemical processing. This session considers specification challenges and performance limitations before considering how newer alloy concepts aim to extend service life and reduce maintenance burdens.
• Failure analysis and remediation of a 22Cr duplex stainless steel 3x6 reducer and associated pipeline. Ahmed Al Yahyaai, Petroleum Development Oman( PDO)
• Limitations of duplex stainless steels in the process industry. Jonas Howing, Alleima
• Duplex reimagined: Nikopolium NP 2205 and NP 2507- engineering solution bringing higher quality, longer life and lower maintenance. Andrii Balev, Centravis
12.30-14.00 Lunch 14.00 Performance optimisation of welded duplex Moderator: Raymond Cordewener
Focusing on welding super duplex stainless steels, this session examines how process variables, from wire chemistry and GTAW / TIPTIG parameters to shielding and backing gas composition, shape weld metal and root microstructures. Presenters will link these microstructural shifts to corrosion performance, including efforts to surpass PREN 42 and boost pitting resistance in demanding service environments.
• Microstructure and corrosion behaviour of GTAW- TIPTIG welded super duplex stainless steel. Dirk Engelberg, University of Manchester
• Optimisation of ZERON 100X super duplex solid welding wire composition to meet a PREN of 42 minimum and enhance weld pitting corrosion resistance. Dr Glenn Byrne, NeoNickel Blackburn Ltd
• Effect of backing gas composition during TIG welding of Aperam superduplex DX2507( 1.4410, UNS 32750) on root surface microstructure and pitting corrosion resistance. Jerome Bridel, Aperam
• Weld microstructure in duplex stainless steels using a novel waveform-gas combination. Andres Acuna, Lincoln Electric
16.15 Fabrication and manufacturing processes Moderator: Kasra Sotoudeh
15.30 – 16.15 Coffee break 16.15 Duplex microstructures: the source of good properties Moderator: Jacko Aerts, dsm-firmenich
This session focuses on how fabrication and downstream processing influence the performance of duplex and superduplex, from forming behaviour to surface damage and hydrogen exposure. Presenters will highlight advances in servo-press formability, strain-based methods for assessing hydrogen embrittlement, and how local grinding can alter properties in cold-hardened tubing.
• Formability improvement of lean duplex stainless steel using servo press motion control. Takuya Sakuraba, Nippon Steel Corp
• Significance of strain-based quantitative methods for evaluating resistance to hydrogen embrittlement. Kasra Sotoudeh, TWI Ltd.
• Effect of local surface grinding on the material properties of coldhardened super duplex stainless steel tubes. Beatriz Calleja, Tubacex
• Opportunities for using duplex grade 2404 in tank and vessel applications. Claes Tigerstrand, Outokumpu Stainless AB
This session examines how phase balance, thermal history, and weld metallurgy shape the microstructure of duplex and super duplex stainless steels, and ultimately their corrosion and mechanical performance. Case studies will cover unusual metallographic observations in welds, isothermal annealing effects in cast S32760, and how austenite stability drives ferrite texture development in sheet products.
• Duplex welds under the microscope – unusual metallographic findings and how to verify them. Elin M. Westin, voestalpine Bohler welding group
• Effect of austenite phase stability on the formation of ferrite-phase texture in duplex stainless-steel sheets. Ryosuke Hayashi, Nippon Steel Corp
• Effect of isothermal annealing on phase transformation and corrosion properties of UNS S32760 cast SDSS. S. Sehar, M. Pigato, M. Faraji, I. Calliari, University of Padua, Italy
18.00 Networking reception
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