Sourcing welded triangular tubes from China

Duty and codes for triangular welded tubes

Read from the UK Trade Tariff on 1 October 2026, heading 7306 covers iron or steel tubes, pipes and hollow profiles. Welded triangular tubes belong to the other non-circular cross-section branch: stainless steel under 7306 69 10 00 and other steel under 7306 69 90 00. The table shows finish variants sharing these codes.

Both relevant lines show 50% third-country duty for goods from China, with no listed anti-dumping or countervailing duty, suspension or import control. Our wider welded steel tube guide describes a 0% steel quota route. Have your broker confirm eligibility and availability rather than budgeting on quota being granted. The supplied snapshot does not identify quota details.

Give your broker the cross-section drawing, material specification, manufacturing method and intended use to confirm the commodity code. Do not use a circular, square or rectangular tube code for a triangular profile. For future shipments, check the UK carbon border adjustment mechanism implications: the tax takes effect from 1 January 2027.

Specify the triangle, seam and intended use

Specify whether the triangle is equilateral, isosceles or an unequal-sided profile. Supply a drawing showing side dimensions, corner radii, wall thickness, seam position, straightness, twist and cut-length tolerances. State steel grade, surface finish, internal weld-bead treatment and whether the tube must fit a sleeve, connector or jig.

Ask for a trial length made using the proposed production tooling and test it in your assembly. Agree the mill documents and any bend or weld tests with the factory. For construction use, establish the applicable product standard and assessment route before ordering. Under the CE route, a construction product covered by a harmonised standard or European Technical Assessment requires a declaration of performance. CE marking remains available for construction products in Great Britain.

Worked duty example

Illustrative example, not a quote: Illustrative order: 6 tonnes of welded triangular stainless steel tubes under 7306 69 10 00, 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 50% is £18,000. Import VAT at 20% is charged on the customs value plus duty, £54,000, so it is £10,800. Import taxes total £28,800; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £18,000 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Profile: compare sampled ends with the approved drawing and mating parts; check side dimensions, corner radii, wall thickness and seam position.

Straightness: check bow and twist along sampled lengths, end squareness and fit in the buyer's jig.

Weld and surface: inspect for seam opening, cracks, excessive internal bead, rust and damaged coating; perform the tests agreed in the purchase specification.

Traceability and packing: match bundle labels and heat numbers to mill documents; check quantities, protected ends and damage beneath straps on arrival.

What goes wrong

A tube can match its overall width yet fail to fit because the corner radius, side angles or internal weld bead differ from the approved sample. Forming and handling can leave twist, crushed corners or bowed lengths. A coating can conceal seam defects, so inspect an unfinished trial sample as well as the finished product.

Generic circular-tube drawings and certificates can leave the triangular profile unverified. Agree measurable acceptance criteria and keep the approved sample with the inspection brief. Use quality inspection guidance to plan checks before shipment and repeat the fit checks on arrival.

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.