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 + chlorides, (200 ppm CI-)
Conc.H2SO4%1111555101010101020202020
Conc.Cl-ppm200200200200200200200200200200200200200200200200
Temp.°C708090100708090506070809040506070
Grade or type of alloy:
Carbon steel
13 Cr
Alleima® 1802
Alleima® 3R12
Alleima® 3R60 0 1
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L') 01102 002 01
Sanicro® 28 00000 10011
254 SMO0002002 0022 0 1
654 SMO 0
SAF™ 2304 22
SAF™ 2205 00 20222
SAF™ 2507 000000020000
SAF™ 2707 HD 0
SAF™ 2906 0
SAF™ 3207 HD 0
Ti

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

Sulphuric acid + chlorides
Conc.H2SO4%2020303030304040405050
Conc.Cl-ppm200200200200200200200200200200200
Temp.°C8090304050601525405060
Grade or type of alloy:
Carbon steel
13 Cr
Alleima® 1802
Alleima® 3R12
Alleima® 3R60 2
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L')2 01 211
Sanicro® 28 10 1100000
254 SMO12011 000
654 SMO
SAF™ 2304
SAF™ 2205 2 22 20
SAF™ 2507 2 22
SAF™ 2707 HD 2
SAF™ 2906 2
SAF™ 3207 HD 1
Titanium (CP Ti)

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

Sulphuric acid + chlorides
Conc.H2SO4%111133555555101010
Conc.Cl-ppm200020002000200020002000200020002000200020002000200020002000
Temp.°C708090100=BP40505060708090100204050
Grade or type of alloy:
Carbon steel
13 Cr
Alleima® 1802
Alleima® 3R12
Alleima® 3R600 1 0
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L')01 01 001
Sanicro® 280 00000 000
254 SMO000 000 001
654 SMO0001 00000 000
SAF™ 2304 00 1 2
SAF™ 2205 01
SAF™ 2507 100000002000
SAF™ 2707 HD 0
SAF™ 2906 0
SAF™ 3207 HD 0
Titanium (CP Ti)

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

Sulphuric acid + chlorides
Conc.H2SO4%101010151520202020303030304040
Conc.Cl-ppm200020002000200020002000200020002000200020002000200020002000
Temp.°C607080506020304050153040501530
Grade or type of alloy:
Carbon steel
13 Cr
Alleima® 1802
Alleima® 3R12
Alleima® 3R60
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L') 01 1 1
Sanicro® 28 001 0
254 SMO 00 1 1
654 SMO000000000000201
SAF™ 2304 22
SAF™ 2205
SAF™ 250701212 1 2
SAF™ 2707 HD 0 0
SAF™ 2906 0 0
SAF™ 3207 HD 0 0 0
Titanium (CP Ti)

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

Sulphuric acid + chlorides
Conc.H2SO4%505060607070808090909898
Conc.Cl-ppm200020002000200020002000200020002000200020002000
Temp.°C153015301530153015301530
Grade or type of alloy:
Carbon steel
13 Cr
Alleima® 1802
Alleima® 3R12
Alleima® 3R60
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L')1 0 00011 00
Sanicro® 28
254 SMO1 1 01011 1
654 SMO11110100 2
SAF™ 2304
SAF™ 2205
SAF™ 2507
Titanium (CP Ti)

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.