[ Duplex ]
[ Duplex ]
to increased use of duplex . As in pulp & paper and desalination , it is the combination of corrosion and erosion that is driving this trend . For example , NSSC ’ s duplex perforated metal was introduced as a stronger alternative to austenitics for sanitary strainers . Longer life , improved buffing and polishing , lower thermal expansion , higher corrosion resistance and strength are among the qualities claimed for this product . Once again , it is East Asia where growth is strongest : the Indian government has approved 41 mega food parks , 376 cold chain projects and 489 proposals for food processing capacity expansion . Water and desalination are both areas in which duplex has superseded austenitic in more demanding applications . A case in point is the Tateno Dam in Kumamoto Prefecture , Japan which stores water temporarily to prevent flooding . The screens , pipes and gates used in the discharge process require strength and wear resistance , so lean grade SUS821L1 ( equivalent to 2120 ) was applied , even though 304 was the grade originally considered . Similarly , in Stadtwerke ’ s large drinking water storage facility in Ulm , Germany , grade 2101 was applied
The Stadtwerke Ulm facilty is the largest stainless steel drinking water storage facility in Europe . Constructed of 316L stainless steel , lean duplex and super duplex , it has a total volume of 12,000 m ³ ( 3 x 4,000 m ³). Photo : Hydro-Elektrik GmbH
for the tank bottoms and lower shell , and a super-duplex grade for the upper section of the shell and the roof to handle chlorine dioxide . Other examples ( from geothermal to biogas , carbon storage and infrastructure ) could be cited to show the improvement duplex brings , including
longer life , lower maintenance , savings in weight , energy and cost , and more .
Fabrication improvements It has been argued that fabrication techniques for duplex are more difficult to master than for austenitics . This is doubtful , and it is fairer to say
18 Stainless Steel World April 2025 www . stainless-steel-world . net