NC2297 Alloy C22 (Hastelloy C22) Wire

Description of Alloy C22 Wire

Alloy C22 is a Ni-Cr-Mo alloy that includes tungsten and has very low levels of carbon and silicon. The high chromium level ensures resistance to oxidising media, whereas the molybdenum and tungsten contents contribute to resistance against reducing media.

This nickel alloy provides resistance to oxidising aqueous media, including wet chlorine and mixtures containing nitric acid or oxidising acids with chloride ions. It also resists oxidising acidic chlorides, wet chlorine, formic and acetic acids, iron and copper chlorides, seawater, and brine. It remains effective against various mixed or contaminated chemical solutions, both organic and inorganic.

The alloy maintains its integrity in environments where reducing and oxidising conditions occur in process streams. This trait is beneficial in multi-purpose installations, as these conditions occur frequently.

This nickel alloy resists grain boundary precipitate formation in the heat-affected zone of welds. It is suitable for most chemical process applications in the welded condition.

Alloy C-22 should not be used at operating temperatures above 1250° F, as harmful phases form above this temperature.

Specifications of Alloy C22 Wire

ASTM Specifications

Applications of Alloy C22 Wire

• Stack Lining:
• Independent tests indicate that the alloy achieves a corrosion rate below maximum permitted levels under oxidising and reducing conditions. This property qualifies its use in stack lining applications.
• Pipes:
• The alloy is appropriate for pipes based on its measured corrosion rates in oxidising test conditions. It has maintained structural integrity for over 10 000 operational hours in accelerated tests.
• Dampers:
• The alloy’s corrosion and oxidation performance has been confirmed under controlled tests with corrosive gases. It is therefore applied in dampers.
• Washers:
• Given its corrosion resistance data, the alloy is suitable for washers exposed to pollutants and chemicals.
• Heat Exchangers:
• The alloy has shown the capability to withstand exposures to both oxidising and reducing environments. Its thermal stability supports long-term performance in heat exchangers.
• Reaction Vessels:
• The alloy resists a range of corrosive substances, including acids and chlorides. It is hence used for reaction vessels where chemical resistance is mandated.
• Evaporators:
• It has demonstrated corrosion resistance in environments involving concentrated solutions and chemicals. This reliability in test conditions supports its use in evaporator applications.