This specification covers iron-chromium and ironchromium- nickel alloy castings for heat-resistant service. The grades covered by this specification are general purpose alloys and no attempt has been made to include heat-resisting alloys used for special production application.
| Grade | Type |
|---|---|
| HF | 19 Chromium, 9 Nickel |
| HH | 25 Chromium, 12 Nickel |
| HI | 28 Chromium, 15 Nickel |
| HK | 25 Chromium, 20 Nickel |
| HE | 29 Chromium, 9 Nickel |
| HT | 15 Chromium, 35 Nickel |
| HU | 19 Chromium, 39 Nickel |
| HW | 12 Chromium, 60 Nickel |
| HX | 17 Chromium, 66 Nickel |
| HC | 28 Chromium |
| HD | 28 Chromium, 5 Nickel |
| HL | 29 Chromium, 20 Nickel |
| HN | 20 Chromium, 25 Nickel |
| HP | 26 Chromium, 35 Nickel |
| HG10 | 19 Chromium |
| MNN | 12 Nickel |
| CT15C | 20 Chromium, 33 Nickel, 1 Niobium |