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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, H3OP4
Conc. % 1 1 1 3 5 5 5 10 10 10 10 20 20 20 30 30
Temp. °C 20 100
=BP
140 100
=BP
20-60 85 100
=BP
40 60 80 101
=BP
35 60 102
=BP
20-35 60
Grade or type of alloy:
Carbon steel 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
13 Cr 0 2 1 2 0 0 2 2 2 2 2 2 2 2 2 2
Sandvik 1802 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Sandvik 3R12 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Sandvik 3R60 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
18Cr13Ni3Mo 1)
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
17Cr14Ni4Mo 2)
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Sandvik 2RK65 ('904L') 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Sanicro 28 0 0 0 0
254 SMO 0 0 0 0
654 SMO 0 0 0 0
Sandvik SAF 2304 0 0 0 0 0 0
Sandvik SAF 2205 0 0 0 0
Sandvik SAF 2507 0 0 0 0 0 0 0 0 0 0 0
Titanium (CP Ti) 0 0 0 1 0 1 2 0 1 2 2 0 1 2 0 1

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

Phosphoric acid, H3OP4
Conc. % 30 40 40 40 40 50 50 50 50 50 50 60 60 60 60 70
Temp. °C 100 35 50 100

106
=BP

20 35 50 85 100 110
=BP
20 35 100 116
=BP
35
Grade or type of alloy:
Carbon steel 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
13 Cr 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik 1802 1 0 0 1 2 0 0 0 1 2 2 0 0 2 2 0
Sandvik 3R12 1 0 0 1 2 0 0 0 0 1 2 0 0 2 2 0
Sandvik 3R60 0 0 0 0 1 0 0 0 0 1 2 0 0 1 2 0
18Cr13Ni3Mo 1)
0 0 0 0 1 0 0 0 0 1 1 0 0 1 2 0
17Cr14Ni4Mo 2)
0 0 0 0 0 0 0 0 0 0 1 0 0 1 2 0
Sandvik 2RK65 ('904L') 0 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0
Sanicro 28 0 0 0 0 0 0 0 0 0 1 1
254 SMO 1 0 0 0 0 0 0 1
654 SMO 0 0 0 0 1 0 0 0 0
Sandvik SAF 2304 0 1 0 0 0 0 0 1 0 0 0 2 0
Sandvik SAF 2205 0 0 0 0 0 0 0 0 0 0 1
Sandvik SAF 2507 0 0 0 0 0 0 0 0 0 0 1
Sandvik SAF 2707 HD 0
Sandvik SAF 2906 0
Sandvik SAF 3207 HD 0
Titanium (CP Ti) 2 1 2 2 2 0 1 2 2 2 2 1 1 2 2 2

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

Phosphoric acid, H3OP4
Conc. % 70 70 80 80 80 80 80 85 86 86 86 86 86 86 86
Temp. °C 90 126
=BP
20 35 80 100 146
=BP
105 20 50 85 95 105 115 156
=BP
Carbon steel 2 2 2 2 2 2 2 2 2 2 2
13 Cr 2 2 2 2 2 2 2 2 2 2 2
Sandvik 1802 2 2 0 0 2 2 2 0 1 2 2
Sandvik 3R12 2 2 0 0 1 2 2 0 0 1 2 2
Sandvik 3R60 1 2 0 0 0 1 2 0 0 1 2
18Cr13Ni3Mo 1)
0 2 0 0 0 1 2 0 0 1 2
17Cr14Ni4Mo 2)
0 2 0 0 0 1 2 0 0 1 2
Sandvik 2RK65 ('904L') 0 1 0 0 0 1 2 0 0 0 0 1 2
Sanicro 28 0 1 1 1 2
254 SMO 0 1 0 0 0 0 1 0 0 0 0 1 1 2
654 SMO 0 1 0 0 0 0 1 0 0 0 1 2
Sandvik SAF 2304 0 2 0 0 0 0 2 1 1 2
Sandvik SAF 2205 0 1 1 2 0 0 0 1 2
Sandvik SAF 2507 0 2 0 2 0 0 0 1 1 2
Sandvik SAF 2707 HD 1 2 1
Sandvik SAF 2906 0 1 1 1
Sandvik SAF 3207 HD 2 2 0
Titanium (CP Ti) 2 2 2 2 2 2 2 2 2 2 2

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