Properties of Metals
It is thought to start with chromium carbide deposits along grain boundaries that leave the
metal open to corrosion. This form of corrosion is controlled by maintaining low chloride
ion and oxygen content in the environment and use of low carbon steels.
Despite the extensive qualification of inconel for specific applications, a number of
corrosion problems have arisen with inconel tubing. Improved resistance to caustic stress
corrosion cracking can be given to inconel by heat treating it at 620C to 705C,
depending upon prior solution treating temperature. Other problems that have been
observed with inconel include wastage, tube denting, pitting, and intergranular attack.