| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | blast furnace | United States | Key component of steel production and industrial infrastructure | 1 |
| 2 | blast furnace | United States | Blast furnace is a key component in the steel industry, used for smelting iron ore and producing steel. | 1 |
| 3 | blast furnace | United States | Key component of steel production, used in industrial settings | 1 |