Duplex – ideal for the maritime sector 18 June 2019

Duplex is a material with a lot of potential, and impresses with a number of advantages. It meets the highest requirements in terms of quality, corrosion resistance and long-term strength – making it the ideal material for maritime applications in particular.

At the beginning of last year, the WASI product range was extended by articles made of duplex material 1.4462 in order to meet all market requirements and customer demands. Above all, the clear advantages and various application possibilities have made duplex a popular product among customers, especially for the maritime sector. More and more engineers are already considering duplex material 1.4462 when planning projects.

Duplex – permanently seawater resistant
Resulting from its high chromium content duplex is extremely resistant to corrosion, in particular to intergranular corrosion, and has a high PREN value making it permanently resistant to seawater. Duplex also has high strength and ductility values and high resistance to frictional wear, as well as low thermal expansion. The material can also be processed very well and welding, turning, drilling, and polishing are all possible.

Compared to purely austenitic steels, duplex steels have a lower nickel content, which makes them more price stable. Another advantage is the possibility to save costs, which is mainly due to the weight reduction and the possibility to choose a smaller diameter. As a result of their high corrosion resistance, duplex steels also require less maintenance. Above all, there are some significant advantages of duplex in direct comparison with A5 stainless steels.

Predestined for maritime applications
Duplex fasteners have properties that make them extremely interesting for many applications. This material is suitable for a wide range of fields such as in marine technology – for example onshore, offshore, shipbuilding, swimming pools and pool construction.

Duplex steel fasteners are also amongst the strongest and most durable in the world. Duplex stainless steels are divided into five groups ranging from lean duplex to hyper duplex. These steels are characterised by a balanced austenitic-ferritic two-phase structure with a ratio of 50:50, combining the positive properties of ferrite and austenite. Duplex steels have a high strength – comparable to higher strength structural steels.

The WASI duplex range includes hexagon and hexagon socket screws, as well as hexagon nuts, threaded rods, washers, spring washers and chains.



Will Lowry Editor t: +44 (0) 1727 814 509


Will joined Fastener + Fixing Magazine in 2007 and over the last 12 years has experienced every facet of the fastener sector - interviewing key figures within the industry and visiting leading companies and exhibitions around the globe.

Will manages the content strategy across all platforms and is the guardian for the high editorial standards that the Magazine is renowned.