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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.

Sulphuric acid, H2SO4
Conc. % 0.1 0.5 0.5 0.5 1 1 1 1 1 2 2 2 3 3 3
Temp. °C 100=BP 20 50 100=BP 20 50 70 85 100=BP 20 50 60 20 35 50
Grade or type of alloy:
Carbon steel 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
Sandvik 1802 2 0 2 2 0 2 2 2 2 0 2 2 0 2 2
Sandvik 3R12 2 0 1 2 0 1 1 2 2 0 1 1 0 1 1
Sandvik 3R60 1 0 0 1 0 0 0 1 1 0 0 0 0 0 0
18Cr13Ni3Mo 1)
1 0 0 1 0 0 0 1 1 0 0 0 0 0 0
17Cr14Ni4Mo 2)
1 0 0 1 0 0 0 0 1 0 0 0 0 0 0
Sandvik 2RK65 ('904L') 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0
Sanicro 28 0 0 0 0 0 0 0 0 0 0 0 0 0 0
254 SMO 0 0 0 0 0 0 1 0 0 0 0 0 0
654 SMO 0 0 0 0 0 0 0 0 0 0 0 0 0
Sandvik SAF 2304 1 0 0 0 0 0 0 1 0 0 0 0 0 0
Sandvik SAF 2205 0 0 1 0 0 0 0 0 0 0 0 0 0
Sandvik SAF 2507 0 0 0 0 0 0 0 0 0 0 0 0 0
Titanium (CP Ti) 1 0 0 1 0 0 1 1 1 0 0 1 0 0 1

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

Sulphuric acid, H2SO4
Conc. % 3 3 5 5 5 5 5 5 10 10 10 10 10 20 20
Temp. °C 85 100=BP 20 35 60 75 85 101=BP 20 50 60 80 102=BP 20 40
Grade or type of alloy:
Carbon steel 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
Sandvik 1802 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik 3R12 2 2 1 1 2 2 2 2 2 2 2 2 2 2 2
Sandvik 3R60 1 2 0 0 1 1 2 2 0 1 1 2 2 0 1
18Cr13Ni3Mo 1)
1 2 0 0 0 1 2 2 0 1 1 2 2 0 1
17Cr14Ni4Mo 2)
1 2 0 0 0 1 2 2 0 0 1 2 2 0 1
Sandvik 2RK65 ('904L') 0 1 0 0 0 0 1 2 0 0 0 1 2 0 0
Sanicro 28 1 0 0 0 0 0 2 0 0 0 0 2 0 0
254 SMO 1 0 0 0 0 1 2 0 0 0 0 2 0 0
654 SMO 0 0 0 0 0 0 0 2 0 0 0 0
Sandvik SAF 2304 1 0 0 0 0 0 2 0 0 0 2 2 1 2
Sandvik SAF 2205 1 0 0 0 0 0 2 0 0 0 1 2 0 0
Sandvik SAF 2507
0 0 0 0 0 0 0 0
2 0 0
Titanium (CP Ti) 1 2 0 1 1 2 2 2 1 2 2 2 2 2 2
Sandvik SAF 2906 0 0 0
Sandvik SAF 2707 HD 0 0 0
Sandvik SAF 3207 HD 0 0 0

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

Sulphuric acid, H2SO4
Conc. % 20 20 20 20 30 30 30 30 40 40 40 40 50 50 50
Temp. °C 50 60 80 100 20 40 60 80 20 40 60 90 20 40 70
Grade or type of alloy:
Carbon steel 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
Sandvik 1802 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik 3R12 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik 3R60 1 2 2 1 2 2 2 2 2 2 2 2 2
18Cr13Ni3Mo 1)
1 1 2 1 1 2 2 2 2 2 2 2 2
17Cr14Ni4Mo 2)
1 1 2 1 1 2 2 2 2 2 2 2 2
Sandvik 2RK65 ('904L') 0 0 1 2 0 0 1 0 0 1 2 0 0 2
Sanicro 28 0 0 2 0 0 1 0 0 1 2 0 0 1
254 SMO 0 0 2 0 0 1 2 1 0 1
654 SMO 0 0 0 2 0 0 0 0 0
Sandvik SAF 2304 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik SAF 2205 0 1 2 2 0 1 2 2 2 2 2 2 2 2 2
Sandvik SAF 2507 0 0

0 1
0

2

2
Titanium (CP Ti) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik SAF 2906 0 2 2 0 2 2 2
Sandvik SAF 2707 HD 0 2 2 0 0 2 2
Sandvik SAF 3207 HD 0 2 2 0 0 0 2

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

Sulphuric acid, H2SO4
Conc. % 60 60 60 70 70 70 80 80 80 85 85 85 85 90 90
Temp. °C 20 40 70 20 40 70 20 40 60 20 30 40 50 20 30
Grade or type of alloy:
Carbon steel 2 2 2 2 2 2 2 2 2 0 1 2 2 0 1
13 Cr 2 2 2 2 2 2 2 2 2 1 1 2 2 0 1
Sandvik 1802 2 2 2 2 2 2 2 2 2 1 1 1 2 0 1
Sandvik 3R12 2 2 2 2 2 2 2 2 2 1 1 1 2 0 0
Sandvik 3R60 2 2 2 2 2 2 1 2 2 1 1 1 2 0 0
18Cr13Ni3Mo 1)
2 2 2 2 2 2 1 2 2 1 1 1 2 0 1
17Cr14Ni4Mo 2)
2 2 2 2 2 2 1 2 2 1 1 1 2 0 1
Sandvik 2RK65 ('904L') 0 1 1 0 1 1 0 1 2 0 0 1 1 0 0
Sanicro 28 0 0 1 0 0 1 1 1 0 0 0 0 0 0
254 SMO 0 1 0 1 0 1 2 0 1
654 SMO 0 1 0 1 1
Sandvik SAF 2304 2 1 1 1
Sandvik SAF 2205 2 2 2 1 2 2 2 1 1 1
Sandvik SAF 2507 0 2 2 2
2 1 1 0 0
Titanium (CP Ti) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik SAF 2906 0 1 2 1
Sandvik SAF 2707 HD 1 2 2 1
Sandvik SAF 3207 HD 0 2 2 1

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

Sulphuric acid, H2SO4
Conc. % 90 90 94 94 94 94 96 96 96 96 98 98 98 98
Temp. °C 40 70 20 30 40 50 20 30 40 50 30 40 50 80
Grade or type of alloy:
Carbon steel 2 2 0 2 2 2 0 1 2 2 1 1 2 2
13 Cr 2 2 0 1 2 2 0 1 2 2 1 1 2 2
Sandvik 1802 2 2 0 0 2 2 0 0 1 2 0 1 2 2
Sandvik 3R12 2 2 0 0 1 1 0 0 0 1 0 0 2 2
Sandvik 3R60 1 2 0 0 0 1 0 0 0 1 0 0 0 2
18Cr13Ni3Mo 1)
1 2 0 0 1 1 0 0 1 1 0 0 1 2
17Cr14Ni4Mo 2)
1 2 0 0 1 1 0 0 1 1 0 0 1 2
Sandvik 2RK65 ('904L') 1 2 0 0 1 1 0 0 1 1 0 1 1 2
Sanicro 28 0 1 0 0 0 0 0 0 0 1 0 0 0 1
254 SMO 1 1 0 2
654 SMO 2 2 2 0 1 2 1 1
Sandvik SAF 2304 1 1 0 0 1
Sandvik SAF 2205 1 0 0 0 1 0 0 1 1
Sandvik SAF 2507 0 2 0 0 0 1 0 0 0 1 0 0 0 1
Titanium (CP Ti) 2 2 2 2 2 2 2 2 2 2 2 2 2 2
Sandvik SAF 2906 2
Sandvik SAF 2707 HD 2
Sandvik SAF 3207 HD 2

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

Sulphuric acid, H2SO4
Conc. H2SO4 % 100 100 100 100 100 100
Conc. SO3 % 7 11 11 60 60 60
Temp. °C 60 60 100 20 70 80
Grade or type of alloy:
Carbon steel 0 0 2
13 Cr 0 0 2 2
Sandvik 1802 0 0
Sandvik 3R12 0 0 1 0 0 0
Sandvik 3R60 0 0 0 0 0 0
18Cr13Ni3Mo 1)
0 0 0 0
17Cr14Ni4Mo 2)
0 0 0 0
Sandvik 2RK65 ('904L') 0 0 0 0
Sanicro 28
254 SMO
654 SMO
Sandvik SAF 2304
Sandvik SAF 2205
Sandvik SAF 2507
Titanium (CP Ti) 2 2 2 2 2 2

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