F436 Chemical Requirements
| Element | Type 1 | Type 3 |
|---|---|---|
| Phosphorous, max | 0.040% | 0.040% |
| Sulfur, max | 0.050% | 0.050% |
| Silicon | - | 0.15 - 0.35% |
| Chromium | - | 0.45 - 0.65% |
| Nickel | - | 0.25 - 0.45% |
| Copper | - | 0.25 - 0.45% |
| Weathering steel washer may also be made from any of the steels listed in Table 2 of A325. | ||