Nickel Insitute - Nickel Alloys in Organic Acids & Related Compounds
TABLE II Comparison of Cast Stainless Steels with Wrought Type 316 Stainless Steel in Organic Acid Media Test Conditions: All tests at boiling temperature for approximately 150 hours in laboratory. Each result shown represents duplicate specimens.
Corrosion Rate
Wrought Type 316 Stainless Steel Annealed
ACI CF-8M
Annealed
Sensitized
ACI
Type 329 Stainless Steel
ALLOYCO 20***
5%*
10%*
5%*
10%*
CD-4MCu WORTHITE**
Temperature
Solution
ºC ºF mm/y mpy mm/y mpy mm/y mpy mm/y mpy mm/y mpy mm/y mpy mm/y mpy mm/y mpy mm/y mpy
.05 .03
2 1
.05 .03
2 1
.03 .03
1 1
.03
1 1
.05
2
Nil Nil
Nil Nil
03 Nil
1
<.03
<1
<.03 <.03
<1 <1
Glacial Acetic Acid
117 102
242 216
03
Nil
Nil
Nil
.03
1
50% Acetic Acid
<.03
<1
<.03
<1
.03
1
01
0.5
Nil
Nil
Nil
Nil
Nil
Nil
<.03
<1
–
–
10% Acetic Acid
100.5
213
.15
6
.18
7
.13
5
.15
6
.08
3
<.03
<1
<.03
<1
<.03
<1
–
–
85% Acetic-15%Formic
109
228
.30
1 2
33
13
.18
7
.20
8
.25
10
08
3
<.03
<1
<.03
<1
.64
25
50% Acetic-15%Formic 106.5
224
.84
33
.89
35
.23
9
.25
10
.13
5
15
6
03
1
.03
1
1.35
53
85% Formic-15%Acetic 104.5
220
48
19
43
17
.28
11
.28
11
.33
13
18
7
05
2
.03
1
1.65
65
88% Formic Acid
104.5
220
.64
25
76
30
.61
24
.66
26
.51
20
.15
6
.15
6
.10
4
8.38
330
50% Formic Acid
102
216
.38
1 5
36
14
.46
18
.46
18
.43
17
<.03
<1
08
3
.10
4
–
–
10% Formic Acid
100
212
*% Ferrite in alloy **Trademark of Worthington Corp. ***Trademark of Aloyco, Inc.
TABLE III
Field Tests in Acetic Acid Distillation Columns
Location in Column Test Duration (Days) Temperature ºC (ºF) Per Cent Acetic Acid
Top 11 120 (248) 99.5+
Top 40 106 (223) 99.9+
Mid 375 100 (212) 20
Bottom 62 121 (250) 99.9+
Bottom 30 119 (246) 90
Corrosion Rate
Alloy
mm/y mpy
mm/y
mpy
mm/y
mpy
mm/y
mpy
mm/y
mpy
<.03
<1 12 35
< .03
<1
.05
2
< .03
<1
.15
6
Type 316 stainless steel Type 304 stainless steel Type 309 stainless steel Type 329 stainless steel Type 216 stainless steel Type 410 stainless steel Type 430 stainless steel CARPENTER 1 alloy 20Cb-3 JESSOP 2 alloy JS-700
.30 .89 .03
.05
2
1
<.03
<1
>12.7 >12.7
>500 >500
<.03
<1
<.03 <.03 <.03
<1 <1 <1
INCOLOY 3 alloy 825 HASTELLOY 4 alloy C* CHLORIMET 5 alloy 2 HASTELLOY alloy B INCONEL 3 alloy 600 MONEL 3 alloy 400 C 10300 (Copper) Nickel 200
<.03 <.03
<1 <1
.13 .03
5 1
.05
2
<.03
<1
.05 .13 .25
2 5
.15 .08 .15 .08
6 3 6 3
10 11
28
.08
3
41
16
(1) Trademark of Carpenter TechnologyCorporation (2) Trademark of Jessop Steel Company (3) Trademark of the Inco family of companies (4) Trademark of Cabot Corporation (5) Trademark of The Duriron Company, Inc.
*An improved version of this alloy, HASTELLOY alloy C-276, has replaced HASTELLOY alloy C.
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