​The carbon footprint of carbon steel HSS and pipe products are no longer something only sustainability consultants track. Structural engineers, procurement managers, and project owners now factor it into material selection. Green building programs, owner reporting requirements, and supply chain goals have all pushed embodied carbon into routine procurement conversations. Two things shape that footprint more than anything else. One is how the steel gets made. The other is whether the manufacturer can document it.

How Manufacturing Affects HSS & Pipe’s Carbon Footprint

Hollow structural section steel production follows two main routes: integrated mills and electric arc furnace (EAF) mills. Integrated mills process raw iron ore through a blast furnace, while EAF mills melt recycled scrap to make new steel. EAF production skips the energy-intensive ironmaking step, so it uses less energy per ton and generates lower greenhouse gas emissions.

For reference, when viewing the tables below, the average unfabricated GWP for Steel Tube Institute members is 1.71 metric ton of CO2e per metric ton of tubing.

Since EAF mills’ primary feedstock is recycled scrap, the steel they produce also carries higher recycled content than blast furnace output. For carbon steel HSS and pipe made in EAF facilities, that difference shows up directly in the global warming potential (GWP) figures and Environmental Product Declaration (EPD) certifications. EAF sourcing is therefore one of the most practical ways to lower the embodied carbon of specified HSS and pipe products. HSS, pipe pile and fire sprinkler pipe all fall within that category, since they all come from coils produced in EAF mills.

The American Iron and Steel Institute tracks EAF adoption and recycling rates across US mills, and its data confirms that EAF now accounts for the majority of domestic steelmaking.

What an EPD Actually Tells You About Carbon Steel HSS and Pipe

An EPD is a third-party verified certification document that records a product's environmental impact across its life cycle. Most EPDs for building products cover a cradle-to-gate scope, which means they document impacts from raw material extraction through manufacturing. Leadership in Energy and Environmental Design (LEED) v4 MRc2 requires EPD certification for credit eligibility, which includes strict scope requirements for transportation, installation, and end of life. Most procurement owners and engineers require a cradle-to-gate EPD as the right document to request from any steel HSS and pipe supplier. The predominant metric to review is GWP, which is measured in metric tons of CO2 equivalent per metric ton of steel. Bull Moose Tube holds an EPD certified by SCS Global Services, valid through November 2026. The Sinton, Texas facility, for example, reports an EAF GWP of 1.06 metric tons of CO2 equivalent per metric ton of steel produced. By comparison, other Bull Moose facilities provide EAF GWP values from 1.16 to 1.49 metric tons per metric ton of product. ​For reference, the average unfabricated GWP for Steel Tube Institute (STI) members is 1.71 metric ton of CO2e per metric ton of tubing.

Those figures reflect real differences in manufacturing efficiency and give project teams real data for carbon accounting rather than a general claims about sustainable sourcing. The World Steel Association publishes lifecycle emissions comparisons across production routes, and its research supports the case for EAF sourcing on projects where embodied carbon reporting matters.

Specifying Carbon Steel HSS and Pipe for LEED and Green Building Requirements

Under LEED v4 MRc2, a project earns one point by using at least 20 permanently installed products from at least five manufacturers with qualifying EPDs. Product-specific EPDs with external third-party verification count as 1.5 products each toward that threshold, which can significantly reduce the number of verified products that can satisfy the requirement more easily.

Bull Moose's EPD certifies products made to the American Society for Testing and Materials (ASTM) A500, A847, A1112, A513, A1085, A252, A787, A1076, A1110, and A135/A795. That range spans hollow structural sections (HSS), pipe pile, mechanical tube and fire sprinkler pipe. A single EPD from one supplier can therefore contribute to the product count across multiple structural categories on the same project.

For projects where long service life is itself a sustainability goal, Bull Moose also manufactures weathering grade steel HSS to ASTM A847. Unlike standard A500, A847 uses a high-strength low-alloy composition that develops a stable patina when exposed to the atmosphere. That patina protects against further corrosion and eliminates the need for painting over the life of the structure. Bull Moose's sustainability documentation and EPD are also available for project teams working through material compliance.

Contact us to learn more about EPD certifications, products, available specifications, or delivery options for your project.