Voestalpine Böhler Welding


Duplex stainless steels have a ferritic-austenitic microstructure, in roughly equal proportions 50% ferrite and 50% austenite. Duplex combines many of the attractive properties of ferritic and austenitic stainless steels into one. They are designed to provide better corrosion resistance, in particular to stress corrosion and pitting corrosion. The microstructure leads to higher strength than standard austenitic stainless steels such as Type 304 or 316. Duplex stainless steels have become more and more popular in recent years.

Microstructure and corrosion resistance of underwater laser clad duplex

During the long-term service of nuclear power plants, the duplex stainless steel (DSS) plate in the spent fuel pool ages. Its failure mechanism is mainly uniform corrosion, stress corrosion cracking (SCC) and pitting corrosion, which poses a serious threat to the safe operation of nuclear power plants. Repairs are usually done by underwater welding technology to reduce the equipment maintenance costs and exposure to radiation.

Super Duplex tubing from Fine Tubes is available now

Fine Tubes announced that specialist metal tubing product, Super Duplex, is now available. The tubing is NORSOK M-650 approved and made to order in specialist non-standard sizes for bespoke orders in the oil and gas and chemical process sectors.

Raccortubi online offering expanded

Raccortubi Group has updated its online produce offering to include its full range of fittings, pipes and flanges.

Schwanner joins BUTTING Group

Schwanner GmbH has become a full member of the BUTTING Group – and 80 employees have joined the BUTTING family. The companies shared vision is to combine their strengths in the field of pipe production and plant construction with the special expertise in vacuum-insulated pipes.

Strategic partnership Kanthal/HYBRIT

Sandvik has announced a strategic partnership between Kanthal and HYBRIT, aiming at revolutionizing the steelmaking technology by developing an electric gas heating solution for the hydrogen used to make fossil-free sponge iron.

Sizeable Hasselmus project awarded

Subsea 7 S.A. has announced the awarded of a sizeable contract by OKEA to Subsea Integration Alliance for the Hasselmus project, seven kilometres north west of the Draugen platform in the southern Norwegian Sea.

Experimenting with welding superduplex without filler metal

The main reason for using lean duplex is its significant resistance to chloride stress corrosion cracking because of its dual phases.

NORSOK-M650 qualification of manufacturers

Highland Foundry Ltd, Surrey, BC Canada, is pleased to announce the successful completion of updating the 22Cr (MDS D46) Duplex and 25Cr (MDS D56) Super Duplex casting Qualification Test Records (QTR’s) to the current Rev.5 for NORSOK M-630 Edition 6 and M-650 Edition 4.

Sydney cyclist bridge

Duplex stainless steel forms an integral part in creating one of Sydney’s most exciting new structures. Located in Macquarie Park, the cyclist bridge provides visual flair, safe accessibility, and excitement to the area.

Posco wins bronze for laser welded tubes

Posco won a bronze prize in the annual ISSF Awards for its laser welded duplex stainless (329J4L) tube for gas gas heaters.