HVD-1 is the designation of a super duplex stainless steel developed for use in fertiliser production. It has a composition of Cr (24.0-28.0%), Ni (2.0-3.0%), Mo (7.5-9.5%), Cu (1.0-2.0%) and so is most comparable with Ferralium 255. As it is no longer commonly produced or actively stocked, Ferralium 255 is a viable alternative grade, often specified alongside HVD-1.
HVD-1 is often specified by OEMs for the construction of valves, pumps and other process equipment involved in the urea and fertiliser production processes. These OEMs are typically supplying items for plants designed by licence holders such as Stamicarbon, Snamprogretti, Thyssenkrupp, and Toyo. The specifications of these licence holders will usually allow a variety of metals including Ferralium 255, which is known to perform well in fertiliser production processes due to its excellent resistance to acids.
Ferralium 255 (UNS32550, DIN 1.4507, F61) is the original SDSS, developed by Langley Alloys in the 1960’s. It is still the only super duplex to provide a yield strength >85ksi, whilst it’s increased copper content (2%) ensures greater resistance to acids.
For customers looking to source metal ex-stock, fortunately Langley Alloys carries an extensive stock of Ferralium 255, with bar up to 16″ (406.4mm) diameter, plate up to 3″ (76.2mm) thickness, and a variety of pipes and fittings available from our warehouses in the UK and USA for immediate delivery.
For more information about high-performance stainless steel alloys, please don’t hesitate to contact us today. We would be happy to answer any questions that you may have regarding specifications and common applications.
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