Alloys for Seawater Service
NeoNickel has been assisting clients in the metallurgical industry for more than 30 years and in that time we have built up an enviable depth of experience and expertise. We understand the stresses and strains that alloys must undergo in service and particularly the extreme conditions present in seawater service. Two alloys in particular are well suited to this environment.
ZERON® 100 super duplex stainless steel
ZERON ® 100 super duplex stainless steel has been developed for use in particularly aggressive environments, such as that experienced in seawater. It is particularly resistant to crevice corrosion and pitting in warm seawater and also has proven resistance to stress corrosion cracking. The alloy has a tough pedigree, being first developed for North Sea pumps and demonstrating excellent anti corrosion qualities. Whereas other alloys rapidly corroded in this environment, ZERON® 100 did not. This success led to its adoption in many other demanding environments and industries and it is now marketed in a variety of product forms.
ZERON® 100 super duplex stainless steel has proven itself to offer superior resistance to crevice corrosion, even in seawater. Such is the confidence in the material that its corrosion performance is guaranteed. It is a comparatively low cost material and also offers excellent stress corrosion cracking resistance across a wide range of environments and applications, including those of sour and chloride. Resistance to sulphuric acid is also good across most concentration ranges. ZERON® 100 has an improved resistance to erosion corrosion and also better corrosion fatigue properties when compared with other grades of stainless steel. In the market it is also known as Super Duplex, Super Duplex Stainless, 25Cr Duplex, EN 1.4501, F55 Duplex and UNS S32760.
Nickel alloy 625 is another metal that is currently utilised in the harshest of environments, due to its high strength and excellent resistance to corrosion. This strength is due to the presence of columbian and molybdenum. Alloy 625 is also prized for its outstanding weldability and it is often used to weld the alloy, AL-6XN. Alloy 625 is sometimes also known as Inconel 625 or Nickel 625. It is marketed in 625 sheet, 625 bar, 625 plate and 625 welding products.
Nickel alloy 625 has an excellent corrosion resistance in a wide range of environments, pressures and temperatures. This makes it a favourite material in the chemical processing industry and also in demanding seawater service. It is relatively easily fabricated and hence is used in plant equipment components. Here, because of its high strength, it can be used to construct thinner-walled equipment and tubing. This clearly saves weight and also improves heat transfer. These qualities have led to Alloy 625 being used for valves, piping, heat exchangers, distillation columns, reaction vessels and subsea plant.
NeoNickel boasts an impressive inventory of alloys for seawater service including both ZERON® 100 super duplex stainless steel and Alloy 625, along with a host of other high performance alloys.
Our value as your partner is further demonstrated in our unrivalled consultancy, advice and service offering, ensuring that you always have the perfect materials for the job.