What is the difference between nickel alloy C22 and hastelloy C276?
What is Hastelloy C22?
Hastelloy c22 is an austenitic alloy known for its ability to operate in harsh conditions where enhanced resistance to high temperatures and corrosion is required. It is often used when other heat-resistant alloys, such as duplex alloys, do not meet the mechanical requirements of the application.
At a molecular level, it is composed of nickel, molybdenum, tungsten and chromium.
What is Hastelloy C22 used for?
As mentioned above, Hastelloy is classified as a heat-resistant alloy. This allows you to take advantage of the precise screening/filtration capabilities of woven wire mesh at temperatures up to 1250°F (676°C).
Additionally, Hastelloy's chemical composition prevents oxidation from occurring at these extreme temperatures. In turn, you will find that the surface of Hastelloy woven mesh will rarely show discoloration.
Now, in terms of corrosion resistance, Hastelloy is used when pitting is a concern. This is particularly beneficial when incorporating industrial grade acids and alkalis into woven wire mesh.
What is Hastelloy C276?
Hastelloy c276 is a specialized woven wire mesh alloy designed to provide versatile corrosion resistance superior to most similar alloys. It is widely known for its formability, being able to be hot and cold formed with relative ease.
Chemically, Hastelloy is composed of manganese, carbon, nickel, iron, silicon, chromium and molybdenum.
What is Hastelloy C276 used for?
Hastelloy is a popular wire mesh alloy suitable for chemical forward applications at temperatures up to 1900°F (1037°C). In fact, it prevents grain boundary precipitation even after welding.
This makes it particularly suitable for chemical processing.
Hastelloy c276 has the rare resistance to hypochlorite solutions, chlorine dioxide solutions and chloride gases. It also works when encountering ferric chloride and copper chloride.
What is the difference between Hastelloy C22 and C276?
The first thing to note when comparing Hastelloy c22 to Hastelloy c276 is that c22 offers more desirable resistance to corrosion, especially pitting and crevices. This is mainly because Hastelloy c22 has a higher chromium content than Hastelloy c276.
Therefore, if oxidation is a concern, Hastelloy c22 is a more ideal choice. Having said that, both alloys have similar properties with regard to the reduction of metal oxides.
But how do you make Hastelloy mesh that's right for your process?
One of the major advantages of Hastelloy c22 compared to Hastelloy c276 is its better solderability. As mentioned above, this includes improved resistance to intergranular corrosion caused by extreme welding thermal after-effects.
Although these alloys have excellent qualities, your budget will be the biggest determining factor in which alloy you can use. Hastelloy c22 requires less material to produce, making it the cheaper of the two Hastelloy variants.
All this to say that Hastelloy c22 is an enhanced version of Hastelloy c276.
