ULTIMET® alloy exhibits very high resistance to chloride-induced pitting and crevice attack, forms of corrosion to which the austenitic stainless steels are particularly prone.
To assess the pitting resistance of ULTIMET® alloy relative to other corrosion-resistant materials, it has been subjected to tests in Green Death (11.5% H2SO4 + 1.2% HCl + 1% FeCl3 + 1% CuCl2). Experiments wereperformed at various temperatures (in increments of 5°C) to determine the lowest temperature at which pitting occurs in a 24 h test period (the so-called Critical Pitting Temperature for Green Death). The results were as follows:
Alloy
|
Critical Pitting Temperature
|
-
|
°F
|
°C
|
ULTIMET®
|
248
|
120
|
C-22®
|
248
|
120
|
C-276
|
230
|
110
|
625
|
167
|
75
|
6B
|
113
|
45
|
316L
|
77
|
25
|