What is a Copper Nickel 70/30 Pipe Fittings?
Given the large levels of manganese and iron present, Copper Nickel 70/30 Pipe Fittings exhibit excellent resistance to corrosion caused by sea water. Copper-nickel alloys UNS C71500 are annealed between 649 and 816°C (1200 and 1500°F). Without any additional material considerations, copper nickel 70/30 pipe fittings are easily cold worked, manufactured, and welded. Iron and manganese are significant additives to Cupro Nickel 70/30 Buttweld Fittings that are required to maintain a high level of corrosion resistance.
Features of Copper Nickel 70/30 Pipe Fittings
There are two different kinds of copper-nickel alloys: 70/30 and 90/10. Due to the substantial levels of manganese and iron present, copper-nickel 70/30 is extremely resistant to corrosion caused by seawater.
A metal used in cryogenic applications is cupronickel. Its great ductility retention and thermal conductivity at very low temperatures make it the perfect material for heat exchangers in freezing facilities when utilized in cryogenic processing and storage equipment.
Despite having a high copper content, cupronickel exhibits a silvery chrome tint. Copper-nickel is utilized in seawater systems and maritime equipment such pipelines, heat exchangers, and condensers due to its exceptional corrosion resistance. High-quality hulls, shafts, and propellers are frequently constructed from this material. Other uses for this material include electrical, chemical, petrochemical, and military equipment.
Different Between 90-10 AND 70-30 Copper Nickel Fittings
Two main copper-nickel alloy grades, which are typically accessible in most product forms, are employed in marine service. These copper base alloys, which are referred to as 90-10 and 70-30 copper-nickel pipe fitting, respectively, either include 10% or 30% of nickel. Both alloys have minor but significant additions of iron and manganese that have been chosen to provide the best overall corrosion resistance and resistance to flowing seawater.
However, for the majority of applications, the 90-10 alloy offers good performance at a lower cost and is typically the more popular of the two alloys. The 30% nickel alloy is tougher and can sustain higher saltwater velocities. Table 1 lists the names of their US and European alloys. Another alloy worth mentioning is a modified 30%Ni alloy with 2%Mn and 2%Fe that is only commercially available as condenser tubing and is utilized in particular in the heat rejection section of multistage flash desalination plants where enhanced impingement corrosion resistance is required.
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