Hydrochloric acid

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.

Symbol clarification

Hydrochloric acid, HCI
Conc. % 0.1 0.1 0.2 0.2 0.2 0.2 0.5 0.5 0.5 1
Temp. °C 20 -50 100 =BP 20 50 100 =BP 130 20 50 100 =BP 20
Grade or type of alloy:
Carbon steel 1 2 1 2 2 2 2 2
13 Cr 1p 1p 1p 1p 2 2 2 2
Sandvik 1802 p p p p p p 2 p
Sandvik 3R12 1p 1ps 1p 1p 1p 1p 2 1p
Sandvik 3R60 0p 0ps 0p 0p 0p 0p 2 0p
18Cr13Ni3Mo 1)
0p 0ps 0p 0p 0p 0p 2 0p
17Cr14Ni4Mo 2)
0p 0ps 0p 0p 0p 0p 2 0p
Sandvik 2RK65 ('904L') 0p 0ps 0p 0p 0p 0p 2 0p
Sanicro 28 0ND 0ND 0ND 0ND 0ND
254 SMO 0ND 0ND 0ND 0ND 0ND 1ND 0ND
654 SMO 0ND 0ND 0ND 0ND 0ND
Sandvik SAF 2304 0ND 0ND 0ND 0 2 0ND
Sandvik SAF 2205 0 0ND 0ND 0ND 0ND 0ND 0ND
Sandvik SAF 2507 0ND 0ND
Titanium (Cp Ti) 0 0 0 0 0p 0 0 1 0

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

Hydrochloric acid
Conc. % 1 1 1 1 2 2 2 3 3 3 3 3
Temp. °C 50 60 80 100=BP 20 60 100=BP 20 60 70 80 100
Grade or type of alloy:
Carbon steel 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
Sandvik 1802 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
Sandvik 3R60 1p 2 2 2 1p 2 2 1p 2 2 2 2
18Cr13Ni3Mo 1)
0p 1p 1ps 2 1p 2 2 1p 2 2 2 2
17Cr14Ni4Mo 2)
0p 1p 1ps 2 1p 2 2 1p 2 2 2 2
Sandvik 2RK65 ('904L') 0p 1p 1ps 2 0p 1p 2 0p 1p 1p 2 2
Sanicro 28 0ND 0ND 0ND 2 0ND 1ND 1ND 2 2 2 2
254 SMO 0ND 0ND 0ND 2 0ND 2 0ND 2 2 2
654 SMO 0ND 0ND 0ND 1ND 0ND 0ND 2 0ND 0ND 2 2 2
Sandvik SAF 2304 1 1ND 2 2 0ND 2 2 2
Sandvik SAF 2205 0ND 0ND 1ND 2 1ND 2 2
Sandvik SAF 2507 0ND 0ND 0ND 0 0ND 0ND 2 0 2 2 2 2
Titanium (Cp Ti) 0 0 0 1 0 0 2 0 0 1 1 2
Sandvik SAF 2906 0 0 0 2p 0 2 2
Sandvik SAF 2707 HD 0 0 0 2p 0 2
Sandvik SAF 3207 HD 0 0 0 2ND 0 1 2p

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

Hydrochloric acid
Conc. % 5 5 5 5 5 5 8 10 10 20 30-37
Temp. °C 20 35 50 60 70 102=BP 60 20-35 60 20-35 20
Grade or type of alloy:
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 2 2 2 2 2 2 2 2 2
Sandvik 3R12 2 2 2 2 2 2 2 2 2 2 2
Sandvik 3R60 2 2 2 2 2 2 2 2 2 2 2
18Cr13Ni3Mo 1)
2 2 2 2 2 2 2 2 2 2 2
17Cr14Ni4Mo 2)
2 2 2 2 2 2 2 2 2 2 2
Sandvik 2RK65 ('904L') 1 2 2 2 2 2 2 2 2 2 2
Sanicro 28 1ND 1ND 2 2 2 2 1ND 1ND
254 SMO 1ND 2 2 2 2 2
654 SMO 0ND 0ND 0ND 2 2 2 2
Sandvik SAF 2304
Sandvik SAF 2205
Sandvik SAF 2507 2 2 2 2 2 2
Titanium (Cp Ti) 1 1 1 1 1 2 1 1 2 2 2

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

Symbol clarification

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

SymbolDescription
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, Sandvik 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.