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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. %0.10.50.50.511111222333
Temp. °C100=BP2050100=BP20507085100=BP205060203550
Grade or type of alloy:
Carbon steel222222222222222
13 Cr222222222222222
Alleima® 1802202202222022022
Alleima® 3R12201201122011011
Alleima® 3R60100100011000000
18Cr13Ni3Mo 1)
100100011000000
17Cr14Ni4Mo 2)
100100001000000
Alleima® 2RK65 ('904L')000100001000000
Sanicro® 2800000000000000
254 SMO0000001000000
654 SMO0000000000000
SAF™ 230410000001000000
SAF™ 22050010000000000
SAF™ 25070000000000000
Titanium (CP Ti)100100111001001

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

Sulphuric acid, H2SO4
Conc. %3355555510101010102020
Temp. °C85100=BP2035607585101=BP20506080102=BP2040
Grade or type of alloy:
Carbon steel222222222222222
13 Cr222222222222222
Alleima® 1802222222222222222
Alleima® 3R12221122222222222
Alleima® 3R60120011220112201
18Cr13Ni3Mo 1)
120001220112201
17Cr14Ni4Mo 2)
120001220012201
Alleima® 2RK65 ('904L')010000120001200
Sanicro® 2810000020000200
254 SMO10000120000200
654 SMO000000020000
SAF™ 230410000020002212
SAF™ 220510000020001200
SAF™ 2507
00000000
200
Titanium (CP Ti)120112221222222
SAF™ 2906000
SAF™ 2707 HD000
SAF™ 3207 HD000

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

Sulphuric acid, H2SO4
Conc. %202020203030303040404040505050
Temp. °C5060801002040608020406090204070
Grade or type of alloy:
Carbon steel2222222222222
13 Cr2222222222222
Alleima® 18022222222222222
Alleima® 3R122222222222222
Alleima® 3R601221222222222
18Cr13Ni3Mo 1)
1121122222222
17Cr14Ni4Mo 2)
1121122222222
Alleima® 2RK65 ('904L')00120010012002
Sanicro® 280020010012001
254 SMO0020012101
654 SMO000200000
SAF™ 2304222222222222222
SAF™ 2205012201222222222
SAF™ 250700

01
0

2

2
Titanium (CP Ti)222222222222222
SAF™ 29060220222
SAF™ 2707 HD0220022
SAF™ 3207 HD0220002

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

Sulphuric acid, H2SO4
Conc. %606060707070808080858585859090
Temp. °C204070204070204060203040502030
Grade or type of alloy:
Carbon steel222222222012201
13 Cr222222222112201
Alleima® 1802222222222111201
Alleima® 3R12222222222111200
Alleima® 3R60222222122111200
18Cr13Ni3Mo 1)
222222122111201
17Cr14Ni4Mo 2)
222222122111201
Alleima® 2RK65 ('904L')011011012001100
Sanicro® 2800100111000000
254 SMO010101201
654 SMO01011
SAF™ 23042111
SAF™ 22052221222111
SAF™ 25070222
21100
Titanium (CP Ti)222222222222222
SAF™ 29060121
SAF™ 2707 HD1221
SAF™ 3207 HD0221

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

Sulphuric acid, H2SO4
Conc. %9090949494949696969698989898
Temp. °C4070203040502030405030405080
Grade or type of alloy:
Carbon steel22022201221122
13 Cr22012201221122
Alleima® 180222002200120122
Alleima® 3R1222001100010022
Alleima® 3R6012000100010002
18Cr13Ni3Mo 1)
12001100110012
17Cr14Ni4Mo 2)
12001100110012
Alleima® 2RK65 ('904L')12001100110112
Sanicro® 2801000000010001
254 SMO1102
654 SMO22201211
SAF™ 230411001
SAF™ 2205100010011
SAF™ 250702000100010001
Titanium (CP Ti)22222222222222
SAF™ 29062
SAF™ 2707 HD2
SAF™ 3207 HD2

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

Sulphuric acid, H2SO4
Conc. H2SO4 %100100100100100100
Conc. SO3 %71111606060
Temp. °C6060100207080
Grade or type of alloy:
Carbon steel002
13 Cr0022
Alleima® 180200
Alleima® 3R12001000
Alleima® 3R60000000
18Cr13Ni3Mo 1)
0000
17Cr14Ni4Mo 2)
0000
Alleima® 2RK65 ('904L')0000
Sanicro® 28
254 SMO
654 SMO
SAF™ 2304
SAF™ 2205
SAF™ 2507
Titanium (CP Ti)222222

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

Symbol clarification

These corrosion tables use a number of symbols, having the following meanings:

Symbol Description
0 Corrosion rate less than 0.1 mm/year. The material is corrosion proof.
1 Corrosion rate 0.1—1.0 mm/year. The material is not corrosion proof, but useful in certain cases.
2 Corrosion rate over 1.0 mm/year. Serious corrosion. The material is not usable.
p, P Risk (severe risk) of pitting and crevice corrosion.
c, C Risk (Severe risk) of crevice corrosion. Used when there is a risk of localised corrosion only if crevices are present. Under more severe conditions, when there is also a risk of pitting corrosion, the symbols p or P are used instead.
s, S Risk (Severe risk) of stress corrosion cracking.
ig Risk of intergranular corrosion.
BP Boiling solution.
ND No data. (Used only where there are no actual data to estimate the risk of localised corrosion instead of p or s).

Disclaimer: Laboratory tests are not strictly comparable with actual service conditions. Accordingly, Alleima makes no warranties, express or implied, and accept no liability, compensatory or consequential, for the performance of different materials in individual applications that may be based on the information provided in this publication.