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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.

Hydrochloric acid, HCI
Conc. %0.10.10.20.20.20.20.50.50.51
Temp. °C20 -50100 =BP2050100 =BP1302050100 =BP20
Grade or type of alloy:
Carbon steel12122222
13 Cr1p1p1p1p2222
Alleima® 1802pppppp2p
Alleima® 3R121p1ps1p1p1p1p21p
Alleima® 3R600p0ps0p0p0p0p20p
18Cr13Ni3Mo 1)
0p0ps0p0p0p0p20p
17Cr14Ni4Mo 2)
0p0ps0p0p0p0p20p
Alleima® 2RK65 ('904L')0p0ps0p0p0p0p20p
Sanicro® 280ND0ND0ND0ND0ND
254 SMO0ND0ND0ND0ND0ND1ND0ND
654 SMO0ND0ND0ND0ND0ND
SAF™ 23040ND0ND0ND020ND
SAF™ 220500ND0ND0ND0ND0ND0ND
SAF™ 25070ND0ND
Titanium (Cp Ti)00000p0010

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

Hydrochloric acid
Conc. %111122233333
Temp. °C506080100=BP2060100=BP20607080100
Grade or type of alloy:
Carbon steel222222222222
13 Cr222222222222
Alleima® 1802222222222222
Alleima® 3R12222222222222
Alleima® 3R601p2221p221p2222
18Cr13Ni3Mo 1)
0p1p1ps21p221p2222
17Cr14Ni4Mo 2)
0p1p1ps21p221p2222
Alleima® 2RK65 ('904L')0p1p1ps20p1p20p1p1p22
Sanicro® 280ND0ND0ND20ND1ND1ND2222
254 SMO0ND0ND0ND20ND20ND222
654 SMO0ND0ND0ND1ND0ND0ND20ND0ND222
SAF™ 230411ND220ND222
SAF™ 22050ND0ND1ND21ND22
SAF™ 25070ND0ND0ND00ND0ND202222
Titanium (Cp Ti)000100200112
SAF™ 29060002p022
SAF™ 2707 HD0002p02
SAF™ 3207 HD0002ND012p

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

Hydrochloric acid
Conc. %555555810102030-37
Temp. °C2035506070102=BP6020-356020-3520
Grade or type of alloy:
Carbon steel22222222222
13 Cr22222222222
Alleima® 180222222222222
Alleima® 3R1222222222222
Alleima® 3R6022222222222
18Cr13Ni3Mo 1)
22222222222
17Cr14Ni4Mo 2)
22222222222
Alleima® 2RK65 ('904L')12222222222
Sanicro® 281ND1ND22221ND1ND
254 SMO1ND22222
654 SMO0ND0ND0ND2222
SAF™ 2304
SAF™ 2205
SAF™ 2507222222
Titanium (Cp Ti)11111211222

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.