General valve material forging materials for low temperature grades, Charpy V-notch impact energy
| Grade | LF1 | LF2 | LF3 | LF5 | LF6 | LF9 | LF787 |
| Applicable temperature ℃ | -29 | -46 | -101 | -59 | -51 | -73 | -73 |
| Test temperature ℃ | -29 | -46 | -101 | -59 | -51 | -73 | -73 |
The minimum average impact energy of three specimens Feet per pound (Joules) | 13 (18) | 15 (20) | 15 (20) | 15 (20) | 15 (20) | 13 (18) | 15 (20) |
The smallest average of a single sample Feet per pound (Joules) | 10 (14) | 12 (16) | 12 (16) | 12 (16) | 12 (16) | 10 (14) | 12 (16) |
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