alloy 625

Nickel Alloys for Corrosion Resistance

January 07, 2015 in Pipe by

Alloy pipeIf you need pipes that can withstand acidic corrosion, nickel alloys may be a good choice.

Nickel alloys like alloy 625, alloy 825 and alloy 400 fall between stainless steel and the exotic materials, such as tantalum, in terms of resistance to corrosion. They’re often used in environments where aggressive inorganic acids are present, where stainless steels would be susceptible to stress-corrosion pitting, cracking and crevice attack.

Corrosion-resistant Attributes

Nickel alloys have a variety of corrosion-resistant attributes, including:

  • Most are very resistant to chloride-induced stress corrosion cracking
  • Many can resist aggressive reducing acids, including hydrochloric and low-to-medium concentrations of sulfuric acid
  • A number of nickel alloys can endure both strong reducing acids and strong oxidizing acids
  • Many have high resistance to alkalis
  • Some have high resistance to localized attack (pitting and crevice corrosion)

Types of Nickel Alloys

There are six main types of nickel alloy, each with its own recommended use case: 

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Inconel Nickel Alloy Tubing

April 30, 2014 in Products by

Nickel tubingThe Basics

First developed by researchers at Wiggin Alloys in England in the 1940’s, Inconel is a family of nickel-chromium alloys. Because of their high performance properties, these alloys are often used in extreme environments. Sometimes called “Inco”, inconel also has a variety of trade names, including Inconel 625, Chronin 625, Altemp 625, Haynes 625, Nickelvac 625 and Nicrofer 6020.

Composition

The composition of different Inconels can vary greatly, but they all are predominantly composed of nickel and chromium. For example, alloy 625 is 58% Nickel and 20-23% chromium.

Advantages

Inconels are resistant to both oxidation and corrosion.

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