Heat Resistant
Alloy | ASTM | Cr% | Ni% | Max℉ | Description |
---|---|---|---|---|---|
HC | A297 A608 A743 |
28.0 | 4.0 max | 2000 (1093℃) | Good sulfur and oxidation resistance, minimal mechanical properties. |
HD | A297 A608 |
28.0 | 5.5 | 2000 (1093℃) | Excellent oxidation and sulfur resistance plus weldability. |
HE | A297 A608 |
28.0 | 9.5 | 2000 (1093℃) | Higher temperature and sulfur resistant capabilities than HD. |
HF | A297 A608 |
21.0 | 10.5 | 1600 (871℃) |
Excellent general corrosion resistance to 1500℉ (816℃) with moderate mechanical properties. |
HH | A297 A608 A447 |
24.0 28.0 |
11.0 14.0 |
2000 (1093℃) | Good strength and oxidation resistance at 1400°-1800℉ (760°-982℃). |
HI | A297 A608 |
28.0 | 16.0 | 2000 (1093℃) | Improved oxidation resistance compared with HH. |
HK | A297 A608 A351 |
24.0 28.0 |
18.0 22.0 |
2100 (1149℃) | Better strength / oxidation resistance than HH. Useful range up to 1900℉ (1038℃). |
HL | A297 A608 |
30.0 | 20.0 | 1800 (982℃) | Improved sulfur resistance compared with HK. |
HN | A297 A608 |
21.0 | 25.0 | 2000 (1093℃) | Very high strength at high temperatures. |
HP | A297 A608 |
26.0 | 35.0 | 2000 (1093℃) | Resistant to both oxidizing and carburizing atmospheres at high temperatures. |
HT | A297 A608 |
15.0 19.0 |
33.0 37.0 |
2100 (1149℃) | Good thermal shock/fatigue resistance. Good carburization resistance. |
HU | A297 A608 |
17.0 21.0 |
37.0 41.0 |
2100 (1149℃) | Elevated temp. strength increases over HT. |
HW | A297 A608 |
10.0 14.0 |
58.0 62.0 |
1800 (982℃) | Higher thermal shock / fatigue and carburization resistance with higher nickel. |
HX | A297 A608 |
17.0 | 66.0 | 2100 (1149℃) | Resistant to hot gas corrosion under cycling conditions without cracking or warping. |
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