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These corrosion data are mainly based on results of general corrosion laboratory tests, carried out with pure chemicals and water solutions nearly saturated with air (the corrosion rate can be quite different if the solution is free from oxygen).

All concentrations are given in weight-% and the solvent is water if nothing else is shown. The corrosion data apply to annealed materials with normal microstructure and clean surfaces, throughout.

Sulphur dioxide, SO2
Temp. °C Dry gas 300 Liquid gas 25 Air-free, 20 Moist gas 100
Grade or type of alloy:
Carbon steel 0 2 2
13 Cr 0 2 2
Sandvik 1802 0 1 1
Sandvik 3R12 0 0 1 1 Oxidation to sulphuric acid
Sandvik 3R60 0 0 0 0 can occur in presence of
18Cr13Ni3Mo 1)
0 0 0 air, resulting in general
17Cr14Ni4Mo 2)
0 0 0 corrosion.
Sandvik 2RK65 ('904L') 0 0 0 See also Sulphurous acid.
Sanicro 28 0
254 SMO 0
654 SMO 0
Sandvik SAF 2304 0
Sandvik SAF 2205 0
Sandvik SAF 2507 0
Titanium (CP Ti) 0 0 0

1) ASTM 317L, e.g. Sandvik 3R64
2) EN 1.4439, e.g. Sandvik 3R68