| [331111] Iron and Steel Mills |
| [331210] Iron and Steel Pipe and Tube Manufacturing from Purchased Steel |
| [331511] Iron Foundries |
| [331513] Steel Foundries (except Investment) |
| [332111] Iron and Steel Forging |
| [332311] Prefabricated Metal Building and Component Manufacturing |
| [332410] Power Boiler and Heat Exchanger Manufacturing |
| [332420] Metal Tank (Heavy Gauge) Manufacturing |
| [332996] Fabricated Pipe and Pipe Fitting Manufacturing |
| [333120] Construction Machinery Manufacturing |
| [333131] Mining Machinery and Equipment Manufacturing |
| [333923] Overhead Traveling Crane, Hoist, and Monorail System Manufacturing |
| [335991] Carbon and Graphite Product Manufacturing |
