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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.

Hydrofluoric acid, HF
Conc. % 0.1 0.1 0.1 0.1
Temp. °C 50 60 70 80
Grade or type of alloy:
Carbon steel
13 Cr
Sandvik 1802
Sandvik 3R12
Sandvik 3R60
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Sandvik 2RK65 ('904L') 0 0 0 1
Sanicro 28
254 SMO 0 0 1
654 SMO 0 0 0 0
Sandvik SAF 2304 0 0 0 0
Sandvik SAF 2205
Sandvik SAF 2507 0 0 0 0
Titanium (CP Ti)

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

Hydrofluoric acid, HF
Conc. % 0.1 0.1 0.5 0.5 0.5 0.5 0.5 1 1 1 1 1 1 10 20 20 30 75 100
Temp. °C 90 100=BP 30 40 50 60 70 20 30 40 50 60 70 20 15 25 15 30 20
Grade or type of alloy:
Carbon steel 2 2 0 0
13 Cr 2 2 2 1
Sandvik 1802 2 2 1
18Cr10Ni 1) 1 2 2 1
17Cr12Ni2.5Mo 2)
0 1 2 2 1
18Cr13Ni3Mo 3)
0 2 2 1
17Cr14Ni4Mo 4)
0 2 2 1
Sandvik 2RK65 ('904L') 1 0 1 1 1 0 1 1 1 2 1 2 2 2 1
Sanicro 28 0 0 1 1 1
254 SMO 1 1 0 0 1 1 0 0 1 1 1 1 1 2 2
654 SMO 0 1 0 0 0 0 0 0 0 0 0 0 1
Sandvik SAF 2304 2 0 1 1 2
Sandvik SAF 2205 1 2
Sandvik SAF 2507 0 1 0 1 1 0 0 0 1 2
Titanium (CP Ti) 2 2 2 2

1) ASTM 304L/304, e.g. Sandvik 3R12 and Sandvik 5R10, respectively
2) ASTM 316L/316, e.g. Sandvik 3R60 and Sandvik 5R60, respectively
3) ASTM 317L, e.g. Sandvik 3R64
4) EN 1.4439, e.g. Sandvik 3R68