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A MESSAGE FROM OUR CHAIRMAN

“Over two days, we aim to inspire meaningful discussions at all levels of expertise, to share different background experiences, foster valuable connections, and provide a platform for technical excellence and innovation. I look forward to meeting many of you personally and to an exciting and productive conference ahead.”

Dr Talal Al Nabhani
Material and Integrity Manager
Petroleum Development Oman
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Duplex World Conference 2026
Wednesday, 6 May 2026 | Day 1
9:45 AM
Welcome from Conference Chairman, Dr Talal Al Nabhani, Material and Integrity Manager, Petroleum Development Oman
10:00 AM – 10:30 AM
Keynote 1: Structural duplex steel - a solution for modern infrastructure challenges
Nancy Baddoo, Associate Director, Structural Design Institute
10:30 AM – 11:00 AM
Keynote 2: Fieldnode additive manufacturing and digital warehousing.
Martin Andersson, Chief Operating Officer, Fieldnode AS
11:00 AM – 11:30 AM
COFFEE BREAK
CONFERENCE ROOM 1
11:30 AM – 12:30 PM
SESSION: Corrosion
Moderator: Dirk Engelberg
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
CONFERENCE ROOM 2
11:30 AM – 12:30 PM
SESSION: Duplex applications.
Moderator: Rodney Rice, Langley Alloys
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 PM – 2:00 PM
LUNCH BREAK
CONFERENCE ROOM 1
2:00 PM – 3:30 PM
Panel Discussion: Securing cost-effective testing requirements
An interactive discussion of the most common quality requirements for duplex materials and welding.
Panellists:
• Mark van den Broek, Fluor
• Hans Martin Jahren, Equinor
• John Houben, 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, 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.
CONFERENCE ROOM 2
2:00 PM – 3:30 PM
SESSION: 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
3:30 PM – 4:15 PM
COFFEE BREAK
CONFERENCE ROOM 1
4:15 PM – 5:45 PM
SESSION: Fabrication and manufacturing processes
Moderator: Kasra Sotoudeh
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
CONFERENCE ROOM 2
4:15 PM – 5:45 PM
SESSION: Duplex microstructures
Moderator: Jacko Aerts, dsm-firmenich
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
6:00 PM
NETWORKING RECEPTION
Thursday, 7 May 2026 | Day 2
10:00 AM – 10:30 AM
Keynote 3: Duplex success stories
Nicole Kinsman, IMOA
10:30 AM – 11:15 AM
Keynote 4: Future applications and material developments, including renewable energies
Speaker TBD
11:15 AM – 12:00 PM
COFFEE BREAK
CONFERENCE ROOM 1
12:00 PM – 1:00 PM
SESSION: Thick-section products/manufacturing
Moderator: Yassar Ghanimi
This session looks at the practical challenges of producing and joining thick-section duplex and super duplex, where heat input, cooling control, and weld procedure qualification become critical. Speakers will compare advanced joining routes, including vacuum electron beam and laser welding, against more conventional approaches, while an end user discusses practical fabrication and reliability concerns.
• Welding of large wall thickness super duplex stainless steel
Fredrik H. Tranø, Equinor
• Potential of Local Vacuum Electron Beam and laser welding of thick-section duplex stainless steels in industrial applications
Chris Punshon, CVE
• Challenges in processing thick-walled (super) duplex from a user's perspective in terms of welding and materials technology.
Kai Engler, BUTTING
CONFERENCE ROOM 2
12:00 PM – 1:00 PM
SESSION: Manufacturing processes
Moderator: Iris Rommerskirchen
This session explores how alloy design, casting practice, and thermal history influence the manufacturability and in-service reliability of duplex and super duplex stainless steels. Presenters will discuss composition and casting optimisation in ER2594 billets, sensitisation risks during continuous cooling across product thicknesses, and practical considerations for safely specifying and producing duplex grades.
• Optimisation of alloy composition and casting conditions to improve surface toughness in ER2594 billets.
Shinsuke Ogyu, Nippon Steel Corp
• Sensitisation of duplex stainless steels during continuous cooling for different plate and sheet thicknesses.
Jan Jonsson, Outokumpu
• Manufacturing challenges and the safe use of duplex stainless steel.
Torfinn Havn, Ztrong Partner
1:00 PM – 2:30 PM
LUNCH BREAK
CONFERENCE ROOM 1
2:30 PM – 4:00 PM
Panel discussion: Supply chain issues (end user, EPC, material supplier, fabricator, engineering company)
With experts representing the supply chain from manufacturers to EPCs and end users, this interactive session tackles issues commonly faced by all. From the availability of grades and product forms, to supply bottlenecks and how these can be alleviated.

The discussion will feature an extensive Q&A with the audience.
Moderator: Barinder Ghai, Alleima

Panellists:
• David Farias, Neste
• Mark van den Broek, Fluor
• McDermott (tbc)
• Patrick Van Roy, Group COEK (tbc)
MASTERCLASS - OPEN TO ALL
CONFERENCE ROOM 2
1:30 PM – 4:30 PM
Masterclass: Understanding Duplex Stainless Steels for Equipment Manufacturers and End Users
This in-depth Masterclass, presented by leading materials experts from the Duplex World Steering Committee, is an extraordinary opportunity to learn from and participate in discussions on some of the most important aspects of using duplexes, including:
• Case studies from attendees and presenters
• The limits of corrosion resistance and weldability: performance or failure, by and from an end-user perspective
• Microstructure & how to test differences; thermal/thermo-mechanical treatments
• Manufacturing: welding, forming (hot and cold), machining
• Heat-treatment, requirements and practical aspects
• Difference in the wide range of grades
• How to handle various product forms (plate, sheet, bar, forgings, pipe, tubing)
• Specs and codes, e.g. NORSOK
• Case studies from attendants and presenters
4:00 PM
REFRESHMENTS AND CLOSING
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