Non-ferrous material

Non-ferrous materials are a small part of the total piping materials, and they are used in a very aggressive environment. Non-ferrous material contains no iron or in a very insignificant amount.

These materials are more expensive than ferrous metals. Some of the non-ferrous material used in Process Industries are listed below. The non-ferrous materials are also known as exotic material.

  • Copper and Copper Alloys
  • Nickel and Nickel Alloys
  • Aluminum and Aluminum Alloys
  • Titanium and Titanium Alloys
  • And Zirconium and Zirconium Alloys

 Copper and Copper Alloys

  • Good thermal conductivity and good corrosion resistance
  • Brasses, Bronzes (Cu-Sn) and Cupronickels (Cu-Ni) are some of the examples of the copper alloy
  • Cupronickels have the highest corrosion resistance among Cu alloys
  • Cupronickels are used for heat exchanger tubing and seawater application
  • It can be used as a cladding material with carbon steel in heat exchanger tube sheets.
Cupronickels elbow

 Nickel and Nickel Alloys

  • Good resistance to oxidation and corrosion
  • Monel 400 and Hastelloy are a well-known example of nickel alloys
  • These alloys are used in piping systems, pressure vessel, turbine blades, valves, and power plant accessories that handle steam at very high pressure and temperature
  • Nickel alloys are frequently used as a cladding material with carbon steel

 Aluminum and Aluminum Alloys

  • Good thermal conductivity
  • It is most workable metal
  • Highly resistant to atmospheric conditions
  • But When coupled with more noble materials it is subject to galvanic attack
  • And Loses strength rapidly above 175°C
  • Aluminum and Aluminum Alloys rarely used in process piping
  • However, it is used as an external cladding material to protect the insulation from water ingress.
Piping Courses
aluminium cladding for pipe

Image – Geo Thermal

 Titanium and Titanium Alloys

  • High strength to weight ratio
  • Similar to SS, Titanium Oxide is formed on the surface which prevents corrosion
  • Titanium and Titanium Alloys has resistant to nitric acid, which is very corrosive in nature. Hence, it is used in this kind of process environments.
  • However, to Weld Titanium and Titanium Alloys, the inert atmosphere is required.
  • It starts losing its strength above 400°C
  • Titanium is also used as a clade material with carbon steel to reduce the cost of equipment

Zirconium and Zirconium Alloys

  • Zirconium and Zirconium Alloys are used, where strong acids and alkalis are present, where other materials cannot be used due to the very aggressive environment.

Thank You for subscribing to Hardhat Engineer. Your Ebook will Open in New Tab

HHE Subscribe Form

Use Your Genuine Email to get Updates on this Ebook in the Future.