Sulfuric and hydrochloric acids are among the most common chemicals produced.in the process industry. Nickel alloys have been a traditional material of choice. This paper will review the alloys available for this service as well as identify the temperature limits and other conditions that should be considered when selecting an alloy.
Titanium does not show the required mechanical strength for high temperature high pressure applications and it can only be used to form liners for an SCWO apparatus. Therefore, pressure tubes made of alloy 625 were lined with titanium grade 2, Additionally corrosion tests with coupons made of titanium grades 2, 5, 7, 12 and P-C were performed.