​A steel manufacturer's recyclability claim is only as credible as the data behind it. Published production data and third-party Environmental Product Declarations (EPDs) are how that credibility gets established. Hollow Structural Sections (HSS) steel produced via electric arc furnace (EAF) uses recycled scrap as its primary feedstock and has a lower carbon footprint than those produced via blast furnace/basic oxygen furnace route. HSS steel's closed-form geometry also reduces the tonnage needed to carry a given structural load. For teams navigating embodied carbon targets and green building certification, those two properties address separate line items on the same checklist.

The Recycled Content Case for HSS Steel

HSS steel produced via the electric arc furnace (EAF) route uses recycled scrap as a primary input, but recycled content levels vary based on the upstream production of hot-rolled coil and the mix of scrap and virgin iron units used by the mill. For that reason, project teams should rely on mills facility-specific EPDs rather than industry-wide averages when evaluating recycled content.

​What remains consistent is the role recycled inputs play in reducing the overall environmental impact of HSS production. Scrap-based steelmaking requires significantly less energy than virgin production routes and results in lower associated greenhouse gas emissions. When paired with facility-specific EPD data, HSS allows design teams to quantify these impacts directly within embodied carbon calculations rather than relying on generalized assumptions.

At the end of its service life, HSS steel is fully recyclable and can be reintroduced into the production cycle without degradation in mechanical properties. This closed-loop material flow ensures that the environmental value of recycled inputs is not a one-time benefit, but part of an ongoing cycle that supports long-term resource efficiency across projects.

Bull Moose Tube has two EPD’s, a standard EPD and a low-embodied carbon (LEC) EPD that covers HSS and other pipe and tube products. This provides design teams with written proof for recycled content, global warming potential, and embodied carbon. These documents form the specific inputs that green building certification submittals require. As a result, mill-verified data eliminates the need to rely on industry averages when substantiating material credits.

How HSS Steel Geometry Reduces Embodied Carbon

Embodied carbon calculations increasingly shape material selection on projects pursuing Leadership in Energy and Environmental Design (LEED) and similar certifications. Wall material in an HSS steel section is distributed around the full perimeter, so members carry high axial and bending loads relative to their cross-sectional area. The same structural capacity requires less tonnage than open sections in many column and compression applications. Specifying HSS steel where geometry and load conditions support it reduces total frame weight without compromising structural performance.

Certification Credits and Long-Term Building Value

LEED and other rating systems reward material transparency alongside recycled content and regional sourcing. Mill-specific EPD data makes those contributions documentable rather than estimated. Because Bull Moose Tube operates manufacturing facilities across North America, projects can often satisfy regional sourcing thresholds without extending supply chains further than the project already requires. Furthermore, domestic production keeps delivery timelines predictable for project schedules.

Steel-framed buildings also contribute to sustainability through longevity and adaptability. A structure with HSS framing members can be reconfigured, expanded, or repurposed without demolition. Structural openings can be added as tenant needs evolve. The frame remains a recoverable asset with documented properties at the end of its lifespan. That service-life flexibility reduces replacement construction frequency and the resource consumption that comes with it. For owners and developers, end-of-life recoverability represents continued material value, not a disposal problem.

The sustainability case for HSS steel rests on documented data at every stage: recycled content at production, EPD transparency at specification, and recoverable material value at end of life. To discuss specifications for your next project, contact our team to learn more.