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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.

Conc. H2SO4 % 1-2
Conc. Ca(HSO3)2 % 1-5
Temp. °C 140
Grade or type of alloy:
Carbon steel 2
13 Cr 2
Sandvik 1802 0
Sandvik 3R12 1 The given values are for the liquid phase and
Sandvik 3R60 0 the air-free gaseous phase. If air is present,
18Cr13Ni3Mo 1)
0 attacks by sulphuric acid can occur in the
17Cr14Ni4Mo 2)
0 gaseous phase. The values are also applicable
Sandvik 2RK65 ('904L') 0 when calcium bisulphite is replaced by
Sanicro 28 magnesium bisulphite, sodium bisulphite or
254 SMO ammonium bisulphite.
654 SMO
Sandvik SAF 2304
Sandvik SAF 2205
Sandvik SAF 2507
Titanium (CP Ti) 0

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