| Chapter Code | Chapter Description |
|---|
| 73052010 | CASING OF A KIND USED IN DRILLING FOR OIL OR GAS : OF IRON |
| 73066100 | OTHER, WELDED, OF NON-CIRCULAR CROSS SECTION : OF SQUARE OR RECTANGULAR- CROSS- SECTION |
| 73065000 | OTHER, WELDED, OF CIRCULAR CROSS- SECTION, OF IRON OR NON-ALLOY STEEL : OTHER, WELDED, OF CIRCULAR CROSS-SECTION, OF OTHER ALLOY STEEL |
| 73064000 | OTHER, WELDED, OF CIRCULAR CROSS- SECTION, OF IRON OR NON-ALLOY STEEL : OTHER, WELDED, OF CIRCULAR CROSS-SECTION, OF STAINLESS STEEL |
| 73072100 | OTHER, OF STAINLESS STEEL : FLANGES |
| 73071120 | OF NON-MALLEABLE CAST IRON : SG IRON CAST FITTINGS |
| 73071190 | OF NON-MALLEABLE CAST IRON : OTHER |
| 73066900 | OTHER, WELDED, OF NON-CIRCULAR CROSS SECTION : OF OTHER NON-CIRCULAR CROSS- SECTION |