| encompass a form of gra… | 0.25 |
| take gray appearance | 0.25 |
| small amounts of mangan… | 0.31 |
| 2–4% carbon | 0.25 |
| brittle | 0.68 |
| hard | 0.57 |
| cheaper | 0.25 |
| harder than wrought iron | 0.25 |
| suitable | 0.25 |
| strong | 0.16 |
| durable | 0.16 |
| unsuitable | 0.16 |
| melted | 0.40 |
| produced about 550 bc | 0.25 |
| used in ancient china | 0.25 |
| put into furnace | 0.25 |