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2026-05-31

SSAB and Heidelberg Materials Are Testing EAF Slag for Cement: Why a New SCM Stream Could Reshape Future Supply

SSAB and Heidelberg Materials launched a four-year project in Sweden on 20 April 2026 to develop electric arc furnace slag into a supplementary cementitious material, backed by more than SEK20m in public funding. For the cement trade, the signal goes beyond one research programme: as steelmaking shifts from blast furnaces to electric arc furnaces, the future slag supply map may change in both chemistry and logistics.

Electric arc furnace steel plant and slag handling area linked to low-carbon cement production
Key insight
SSAB and Heidelberg Materials launched a four-year project in Sweden on 20 April 2026 to develop electric arc furnace slag into a supplementary cementitious material, backed by more than SEK20m in public funding. For the cement trade, the signal goes beyond one research programme: as steelmaking shifts from blast furnaces to electric arc furnaces, the future slag supply map may change in both chemistry and logistics.

A new collaboration in Sweden is drawing attention from far beyond northern Europe. On 20 April 2026, SSAB and Heidelberg Materials announced a four-year research project to turn electric arc furnace slag into a supplementary cementitious material for cement and concrete. The programme is backed by more than SEK20m through Sweden's Just Transition funding framework and brings in Luleå University of Technology, the University of Oulu, and Swerim. On the surface, this is a technical research story. In practice, it is also an early signal that the next era of low-carbon cement may depend not only on how much slag the market needs, but on what kind of slag the steel industry will produce in the future.

Electric arc furnace steel plant and slag handling area linked to low-carbon cement production
As steelmaking decarbonises, the slag stream available to cement producers may evolve in both volume and technical profile.

1. Why this project matters beyond one Swedish partnership

The partnership matters because it links two transitions that are often discussed separately. Steelmakers are moving toward electric arc furnace routes to cut emissions, while cement producers are trying to reduce clinker ratios through more supplementary cementitious materials. Traditionally, blast furnace slag has been the best-known bridge between those two industries. But if the steel sector gradually shifts away from blast furnaces, the long-term supply base for conventional GBFS and GGBFS can no longer be treated as static. The SSAB-Heidelberg project is effectively asking whether part of that future gap can be filled by a different slag stream that is processed, optimized, and qualified for cement use.

That is why the details in the announcement matter. SSAB said it plans electric arc furnace production in Oxelösund from early 2027, in Luleå in 2029, and later in Raahe, Finland. Heidelberg Materials, meanwhile, already uses part of SSAB's slag at its Slite cement plant in Sweden. In other words, this is not a theoretical conversation between two distant sectors. It is a practical attempt to connect a changing steel by-product stream with a real cement production system.

Laboratory-scale testing of processed slag powder and concrete samples for cement applications
The near-term challenge is not only supply. It is whether new slag streams can be qualified at scale for reliable cement performance.

2. The real issue is future SCM quality, not only quantity

For the cement trade, the most useful takeaway is that future slag economics will be shaped by material performance as much as by availability. A new SCM source only matters if it can be tuned to deliver consistent behavior in grinding, blending, setting, strength development, and durability. That is exactly why the Swedish project is focused on optimization from laboratory scale to pilot scale and on testing performance in cement and concrete applications. The market message is clear: low-carbon demand is pushing the industry to look beyond familiar feedstocks, but any replacement stream must still survive industrial qualification.

This matters for exporters as well. Buyers are unlikely to treat all future slag streams as interchangeable. As steelmaking pathways diversify, procurement teams may become more specific about chemistry, reactivity, glass content, grinding behavior, and long-term consistency. For suppliers, that means the commercial conversation may gradually shift from simply offering slag availability toward proving a repeatable technical profile and a dependable logistics model.

3. What suppliers of GBFS and GGBFS should watch next

The first thing to watch is pace. New steel routes will not replace existing blast furnace slag supply overnight, and EAF-based cement binders are still in the research and qualification stage. But the direction is important. If projects like this succeed, future cement producers may combine traditional blast furnace slag, newer slag-derived SCM streams, calcined clays, and other low-carbon binders in more flexible recipes. The second thing to watch is geography. Regions with aggressive steel decarbonisation could eventually become testing grounds for alternative slag-based SCM supply chains, while markets still rich in blast furnace output may retain an advantage in conventional GGBFS availability for longer.

Processed slag materials and bulk-handling infrastructure for future SCM logistics
In the long run, the SCM market may reward suppliers that combine technical consistency with scalable bulk logistics.

For SENLAN Trading, the broader takeaway is straightforward. The slag market is becoming more strategic, more technical, and more connected to industrial transition policy. Reliable blast furnace slag supply still matters today, but tomorrow's competitive edge may also depend on understanding how new SCM streams emerge, how they are qualified, and where they fit inside blended-cement economics. The Swedish project is still early-stage, but it points to a future in which the question is no longer only who has slag to sell. It is also who understands what the next generation of slag-based cement materials will look like.