- Tubular components now also have environmental limits.
- Production tubing, casing, subsurface safety valves, nipples and hangers may be made of "tubular components".
- The Grade C-85 13% Cr alloy is NOT included in MR0175.
- The modified 13% Cr alloys (such as Hyper 1 & 2) require lab testing.
- Other downhole environmental factors may have an influence on selecting the most appropriate alloy. |
| Alloy |
Temp.,
max °F |
pp H2S,
max psi |
Sulfur |
L-80 13%
Cr |
None |
1.5 @ pH
3.5 min |
None |
22% Cr
SS |
None |
0.3 |
None |
25% Cr
super
duplex SS |
None |
3.0 |
None |
I 825 & 28
% Cr & 2242 |
350 |
200 |
None |
Hastelloy
G-3 &
2550 |
425 |
300 |
None |
Hastelloy
C-276 |
450 |
1000 |
Yes |
Sulfur is a critical variable for determining resistance to SCC. |
