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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.

Phosphoric acid, H3PO4 + ammonium sulphate, (NH4)2SO4 + sulphuric acid, H2SO4
Conc. H3PO4 % 10 15 15 15 15 16
Conc. (NH4)2SO4 % 25 25 25 30 20 9
Conc. H2SO4 % 1.5 1 3 3 20 1
Temp. °C 90 100 100 90 20 80
Grade or type of alloy:
Carbon steel
13 Cr
Sandvik 1802
Sandvik 3R12 2 2 2 2 0
Sandvik 3R60 0 0 0 0 0 0
18Cr13Ni3Mo 1)
0 0 0 0 0 0
17Cr14Ni4Mo 2)
0 0 0 0 0 0
Sandvik 2RK65 ('904L') 0 0 0 0 0 0
Sanicro 28 0 0 0 0 0 0
254 SMO
654 SMO
Sandvik SAF 2304 0 0 0 0 0 0
Sandvik SAF 2205 0 0 0 0 0 0
Sandvik SAF 2507 0 0 0 0 0 0
Titanium (CP Ti)

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