| D | Pipes and tubes, carbon steel |
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| D | Pipes and tubes, mild steel |
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| D | Pipes and tubes, steel, seamless |
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| D | Pipes and tubes, steel, electrically welded |
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| D | Pipes and tubes, steel, lap welded |
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| D | Pipes and tubes, steel, butt welded |
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| D | Pipes and tubes, steel, fusion welded |
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| D | Pipes and tubes, steel, tungsten inert gas (TIG) welded |
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| D | Pipes and tubes, steel, precision welded |
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| D | Pipes and tubes, steel, precision |
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| D | Pipes and tubes, steel, thin wall |
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| D | Pipes and tubes, steel, thick wall |
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| D | Pipes and tubes, steel, spiral wound |
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| D | Pipes and tubes, steel, oval |
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| D | Pipes and tubes, steel, square |
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| D | Pipes and tubes, steel, rectangular |
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| D | Pipes and tubes, stainless steel, seamless |
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| D | Pipes and tubes, stainless steel, thin wall |
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| D | Tubing, steel |
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| D | Tubing, stainless steel |
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| D | Tubing, stainless steel, seamless |
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| D | Tubing, chromium steel |
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| D | Tubing, steel, spiral wound |
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| D | Tubing, steel, for domestic heater elements |
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| D | Tubing, stainless steel, microbore |
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| D | Tubing, hydraulic, ferrous |
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| D | Coiled pipes, stainless steel |
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| D | Flues and ducts, ferrous metals |
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| D | Pipes and tubes, ferrous, for water mains |
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| D | Pipes and tubes, ferrous, for irrigation |
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| D | Pipes and tubes, ferrous, for sewage |
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| D | Pipes and tubes, ferrous, for oil and gas mains |
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| D | Pipes and tubes, ferrous, for the nuclear power industry |
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| D | Pipes and tubes, ferrous, for scaffolding |
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| D | Pipes and tubes, ferrous, for lighting fittings |
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| D | Pipes and tubes, ferrous, high pressure |
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| D | Pipes and tubes, steel, for gas, water and steam |
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| D | Pipes and tubes, steel, for the oil industry |
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| D | Pipes, ferrous, for lighting standards |
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| D | Pipes, ferrous, for the building industry |
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| D | Tubes, ferrous, for piling |
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| D | Tubes, ferrous, for compressed air |
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| D | Tubes, ferrous, for hydraulic circuits |
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| D | Tubes, ferrous, heat exchanger |
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| D | Tubes, ferrous, boiler and superheater |
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| D | Tubes, steel, for the motor vehicle industry |
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| D | Tubes, steel, for the chemical industry |
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| D | Tubes, steel, for structural engineering |
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| D | Tubes, steel, for furniture |
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| D | Tubes, steel, naval use |
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| D | Tubes, welded steel, for refrigeration circuits |
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| D | Piping, steel, water and air, for mines |
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| D | Drill pipe, ferrous |
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