What is the embodied carbon of your steel hollow sections?

The declared global warming potential is 1.95 to 2.21 kg CO2e per kilogram, over modules A1 to A3, depending on steel grade. Mild grades sit at the lower end of that range and micro-alloyed or higher-strength grades at the upper end. The declared unit is one kilogram of finished hollow section.

Two cautions worth knowing before you use the figure. First, A1 to A3 covers the product stage only: raw material supply, transport to the manufacturer and manufacturing. Transport to site, installation and end of life are not stated on this certificate, so tell us which modules your model needs and we will check the full EPD report. Second, an A1 to A3 figure is not directly comparable with a declaration that includes transport, so match the boundary before you set one against the other.

To convert to a per-metre figure, multiply by the theoretical mass of the section. A 100x100x5 mm SHS at about 14.4 kg/m works out at roughly 28 to 32 kg CO2e per metre. Worked examples sit on our EPD certification page.