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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.

Sodium hydroxide, NaOH
Conc. % 10 10 10 20 20 25 25 30 30 30 40 40
Temp. °C 20 90 103=BP 20 90 20 112=BP 20 100 116=BP 80 90
Grade or type of alloy:
Carbon steel 0 0 0 0
13 Cr 0 0 1 0 1 0 2 0 1 2 1 1
Sandvik 1802 0 0 0 0 0 0 0 0 0 1 0 0
Sandvik 3R12 0 0 0 0 0 0 0 0 0 1s 0 0
Sandvik 3R60 0 0 0 0 0 0 0 0 0 0s 0 0
18Cr13Ni3Mo 1)
0 0 0 0 0 0 0 0 0 0s 0 0
17Cr14Ni4Mo 2)
0 0 0 0 0 0 0 0 0 0s 0 0
Sandvik 2RK65 ('904L') 0 0 0 0 0 0 0 0 0 0s 0 0
Sanicro 28 0 0 0 0 0 0ND 0 0
254 SMO 0 0 0 0 0ND
654 SMO 0 0 0
Sandvik SAF 2304 0 0 0 0 0ND 0 0
Sandvik SAF 2205 0 0 0 0 0ND
Sandvik SAF 2507 0 0 0 0 0ND
Titanium (CP Ti)
0 0 0 0 0 0 1 0 1 1 1 1

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

Sodium hydroxide, NaOH
Conc. % 40 40 50 50 50 50 50 60 60 60 70 70 70 90 Molten
Temp. °C 100 128=BP 60 90 100 120 140=BP 90 120 160=BP 90 130 180=BP 300 320
Grade or type of alloy:
Carbon steel 2 2 2 2 1 2 2 2 2
13 Cr 1 2 1 1 2 2 2 1 2 2 1 2 2 2 2
Sandvik 1802 1 2 0 1 1 1 2 1 1 2 1 1 2 2 2
Sandvik 3R12 1 1s 0 1 1 1 1s 1 1 2 1 1 2 2 2
Sandvik 3R60 1 1s 0 1 1 1 1s 1 1 2 1 1 2 1s 2
18Cr13Ni3Mo 1)
1 1s 0 1 1 1 1s 1 1 2 1 1 2 1s 2
17Cr14Ni4Mo 2)
0 s1s 0 0 0 0 1s 0 1 2 0 1 2 1s 2
Sandvik 2RK65 ('904L') 0 1s 0 0 0 0 1s 0 0 2 0 0 2 1s 2
Sanicro 28 0 0ND 1ND 0 0 2 2
254 SMO 1ND 0 1 1ND 2 2
654 SMO
Sandvik SAF 2304 1 1ND 0 0 1 2 0 2 0 1
Sandvik SAF 2205 2 1 2 2
Sandvik SAF 2507 1ND 2 2 1 2
Titanium (CP Ti) 1 1 0 1 1 1 1 0 1 2 0 1 2 2 2
Sandvik SAF 2906 0 0 1 0
Sandvik SAF 2707 HD 0 1 2 1
Sandvik SAF 3207 HD 0 0 1 0

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