Sourcing cast iron gilled tubes from China

Duty on cast iron gilled tubes

Read from the UK Trade Tariff on 4 October 2026, heading 7303 covers tubes, pipes and hollow profiles of cast iron. Every supplied line carries 0% duty for goods from China. The supplied record lists no anti-dumping or countervailing duty, steel measure, suspension or attached import control.

For gilled tubes, establish the iron type, coating and whether the tubes are of a kind used in pressure systems. The table gives classification alternatives, not interchangeable declarations. Confirm the drawing and intended use through finding your commodity code. See the wider cast iron pipe guide for the rest of the heading.

Confirm with HMRC whether heading 7303 is within the UK carbon border adjustment mechanism from 1 January 2027 before relying on the site's wider guide. Ask the foundry for emissions information and review the UK carbon border adjustment guide when planning future imports.

Specify the tube bore and gill geometry

Specify the cast iron grade, bore, wall thickness, overall length, gill diameter, gill spacing and gill thickness. Include end connections, sealing faces, support positions and coating. State the working fluid, operating temperature and pressure, and agree the test method and acceptance criteria. Ask for heat-output evidence tied to the proposed geometry and operating conditions.

Government guidance says pressure-equipment rules in Great Britain apply above a maximum allowable pressure of 0.5 bar, subject to exclusions, and include piping. Establish whether the supplied item falls within scope before ordering. Where those rules apply, importers must ensure that the equipment is accompanied by clear, legible and easily understandable English instructions.

Worked duty example

Illustrative example, not a quote: Illustrative order: 50 cast iron gilled tubes for a pressure system, subject to classification confirmation under 7303 00 10 90, invoiced at £32,000 free on board, with £4,000 of freight and insurance to the UK. The customs value is £36,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £36,000, so it is £7,200. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Geometry: measure the bore, wall, length, gill diameter and spacing against the approved drawing; check that connections align with the mating parts.

Casting: inspect gill roots, tube walls and machined ends for cracks, broken fins, visible porosity and casting debris; compare material records with the ordered grade.

Testing: match leak-test records to the delivered batch and agreed procedure; check that thermal-performance evidence uses the ordered tube geometry.

Arrival condition: inspect gill edges, end protectors, coating and crate supports before moving the tubes into storage. Record damage before unpacking further. Use the quality inspection guide to prepare the inspection brief.

What goes wrong

Thin or broken gills, casting leaks and mismatched connections can make a replacement tube unusable. A matching overall length does not establish matching heat output. Agree the geometry and performance evidence before production, then inspect a sample against the actual mating parts.

Packing that supports the load on exposed gills can leave the tubes damaged on arrival. Specify supports and separators that protect the gills, with protected machined ends. Ask the factory to photograph the packing arrangement before closing the crates.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.