CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

TYPICAL PENETRATION RATES IN CORROSIVE MEDIA, Mils (mm) Per Year
)
PHOSPHORIC HYDROFLUORIC SODIUM
ACID ACID HYDROXIDE
10% 30% 50% 85% 5% 25% 45% 5% 25% 50%
HAYNES® alloy No. 25
Room Nil Nil Nil Nil
150 deg. F 0.1
0.1
Nil
0.1
(66 deg. C) « 0.01) « 0.01) « 0.01)
5.0 12 20
(0.13) (0.30) (0.51 )
- - -
Nil Nil Nil
Nil Nil Nil
Boiling
0.2 2.0 4.0 562
«0.01) (0.05) (0.10) (14.3)
- - - Nil - -
')
MULTIMET® alloy
Room Nil Nil Nil Nil
5.0 37 52
(0.13) (0.94) (1.32)
Nil Nil Nil
150 deg. F
Nil
0.1 0.1 0.1 - - - Nil Nil Nil
(66 deg. C) « 0.01) « 0.01) «0.003)
Boiling
0.1 0.3 3.0 303
« 0.01) «0.01) (0.08) (7.70)
- - - Nil - -
)
SULFURIC ACID
2% 5% 10% 25% 50% 60% 77% 80% 85% 90% 96%
HAYNES alloy No. 25
Room Nil Nil Nil Nil Nil Nil Nil Nil Nil Nil Nil
150 deg. F
11
Nil Nil
30 29 55 61 91 123 104
Nil
(66 deg. C) (0.28) (0.76) (0.74) (1.40) (1.55) (2.31 ) (3.12) (2.64)
Boiling
49 52 92 203 >1000 >1000 >1000 >1000 >1000 735 318
(1.24) (1.32) (2.34) (5.16) (>25.4) (>25.4) (>25.4) (>25.4) (>25.4) (18.7) (8.08)
)
CORROSION TEST SAMPLES
Standard spool-type specimens are available for testing under actual plant
conditions. Samples of wrought HASTELLOY§ alloys B-2, C-276, C-22, G-3,
G-30, X, HAYNES® alloy No. 25 and MULTIMET® alloy are available from stock
in the annealed condition.
)
As-welded specimens can be obtained from stock in all these alloys except
MULTIMET® alloy. Corrosion test racks containing up to 20 samples of Cabot
Wrought Products Division alloys and other metals are available for
installation in any plant where corrosion is'a concern.
To obtain corrosion coupons or test racks, contact your local Cabot
Wrought Products Division sales representative or any of the locations shown
on the back cover of this booklet.
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