What are the UK CBAM default values for GI pipe and welded tubes?
HMRC's UK CBAM default for galvanised welded gas pipe (7306 30 41) is 4.400 tCO2e per tonne. Welded circular tubes of 168.3 to 406.4 mm outside diameter (7306 30 80) are 3.078, and rectangular hollow sections with walls up to 2 mm (7306 61 92) 2.700.
Defaults
- 7306 30 41: welded threaded or threadable gas pipe, zinc coated: 4.400 tCO2e per tonne.
- 7306 30 80: welded circular tubes above 168.3 mm up to 406.4 mm: 3.078.
- 7306 30 18: welded precision tubes, not cold-drawn: 2.642.
- 7306 61 92: square or rectangular welded hollow sections, wall up to 2 mm: 2.700.
- 7306 19 00: welded line pipe: 3.924.
Galvanizing is inside, cutting is not
Galvanizing and pickling count in the UK boundary; cutting, welding and finishing do not. The coil you buy is a precursor, so ask your coil supplier for its verified figure.
What Senseible does here
Senseible reads coil purchases, galvanizing fuel and dispatch tonnes, so your pipe figure can be set against 4.400 before your buyer files. We build the figure from your records and check every figure in-house; for the UK it must then be verified by a verifier accredited for UK CBAM. Have your own verifier? Send it to them.
Sources: HMRC, UK CBAM iron and steel default values (published 16 October 2026), HMRC, UK CBAM monitoring, reporting and verification technical guidance (October 2026)
Last reviewed 2026-11-02.