Name: Hastelloy Coil C22
Brand: United Stainless Llp
Availability: InStock
Rating: 4 (16 reviews)

Question 1

What primary compositional difference makes Hastelloy C22 superior to C276 in highly oxidizing chemical environments?

Accepted Answer

Hastelloy C22 has high percentage of Chromium compared to Hastelloy C276. This level of high chromium increases the ability of the alloy to resist wet chlorine and high oxidizing agents such as nitric acid and hypochlorites. Its stability is also increased by the addition of Tungsten.

Question 2

Why is Hastelloy C22 Coil a standard material choice for use in Flue Gas Desulfurization (FGD) systems?

Accepted Answer

In FGD scrubbers, the coil is exposed to a mixture of hot sulfur compounds of an acidic nature, and highly concentrated chlorides. Hastelloy C22 is the one which presents the best proportion between resistance to this aggressive acidity and that which is produced by the chlorides. The initial cost is compensated by its lifetime.

Question 3

How does Hastelloy C22 achieve its extreme resistance to localized attack like pitting and crevice corrosion?

Accepted Answer

This great resistance is due to the synergy of the three primary elements, Nickel, Chromium, and Molybdenum. They form a very stable passive film which self heals readily together to prevent corrosion at its start and propagation as well in narrow crevices or under deposits.