| ALLOY |
ASTM |
NAME |
Cr
% |
Ni
% |
MAX
F° |
DESCRIPTION |
| HC |
A297 |
|
28 |
4
max |
2000° (1093°C) |
Good sulfur and
oxidation resistance, minimal mechanical properties. |
 |
| HD |
A297 |
|
28 |
5.5 |
2000° (1093°C) |
Excellent oxidation
and sulfur resistance plus weldability. |
|
| HE |
A297 |
|
28 |
9.5 |
2000° (1093°C) |
Higher temperature
and sulfur resistant capabilities than HD. |
|
| HF |
A297 |
|
21 |
10.5 |
1600° (871°C) |
Excellent general
corrosion resistance to 1500°
F (816°C) with moderate mechanical properties. |
|
| HH |
A297
A608 |
309 |
24.0
28.0 |
11.0
14.0 |
2000° (1093°C) |
Good strength
and oxidation resistance at 1400°-1800° F (760°-982° C). |
|
| HI |
A297 |
|
28 |
16 |
2000° (1093°C) |
Improved oxidation
resistance compared with HH. |
|
| HK |
A297
A608 |
310 |
24.0
28.0 |
18.0
22.0 |
2100° (1149°C) |
Better strength
/ oxidation resistance than HH. Useful range up to
1900° F (1038° C). |
|
| HL |
A297 |
|
30 |
20 |
1800° (982°C) |
Improved sulfur
resistance compared with HK. |
|
| HN |
A297 |
|
21 |
25 |
2000° (1093°C) |
Very high strength
at high temperatures. |
|
| HP |
A297 |
|
26 |
35 |
2000° (1093°C) |
Resistant to both
oxidizing and carburizing atmospheres at high temperatures. |
|
| HT |
A297
A608 |
330 |
15.0
19.0 |
33.0
37.0 |
2100° (1149°C) |
Good thermal shock
/ fatigue resistance. Good carburization resistance. |
|
| HU |
A297
A608 |
|
17.0
21,0 |
37.0
41.0 |
2100° (1149°C) |
Elevated temp.
strength increases over HT. |
|
| HW |
A297
A608 |
|
10.0
14.0 |
58.0
62.0 |
1800° (982°C) |
Higher thermal
shock / fatigue and carburization resistance with higher
nickel. |
|
| HX |
A297 |
|
17 |
66 |
2100° (1149°C) |
Resistant to hot
gas corrosion under cycling conditions without cracking
or warping. |
|
|
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