HAYNES® 625 alloy is similar to the solid-solution-strengthened superalloys, such as HAYNES® 188 alloy or HASTELLOY® X alloy, which will precipitate deleterious phases upon long- term exposure at intermediate temperatures. In this case, the phase in question is NiCb delta- phase which serves to impair both tensile ductility and impact strength. For applications where thermal stability is important, 230® alloy is recommended.

Room Temperature Properties After Thermal Exposure, Plate
Exposure
|
h
|
0.2% Offset
Yield Strength
|
Ultimate Tensile
Strength
|
Elongation
|
Impact
|
°F
|
°C
|
h
|
ksi
|
MPa
|
ksi
|
MPa
|
%
|
ft.-lb.
|
J
|
As-annealed* |
- |
66.2 |
456 |
127.7 |
880 |
46 |
81 |
110 |
1200 |
649 |
1000 |
122.3 |
843 |
165.0 |
1138 |
28 |
11 |
15 |
4000 |
117.9 |
813 |
163.6 |
1128 |
24 |
8 |
11 |
8000 |
117.8 |
812 |
164.2 |
1132 |
18 |
5 |
7 |
16000 |
118.5 |
817 |
165.4 |
1140 |
12 |
4 |
5 |
1400 |
760 |
1000 |
95.5 |
658 |
142.9 |
985 |
17 |
5 |
7 |
4000 |
104.1 |
718 |
145.5 |
1003 |
12 |
4 |
5 |
8000 |
97.4 |
672 |
142.6 |
983 |
13 |
5 |
7 |
16000 |
96.1 |
663 |
140.4 |
968 |
12 |
4 |
5 |
1600 |
871 |
1000 |
68.3 |
471 |
130.0 |
896 |
30 |
12 |
16 |
4000 |
66.4 |
458 |
130.0 |
896 |
29 |
11 |
15 |
8000 |
63.7 |
439 |
127.0 |
876 |
26 |
15 |
20 |
16000 |
63.4 |
437 |
128.4 |
885 |
32 |
14 |
19 |
*1875°F (1024°C), rapid cooled