Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a Swedish Factory Recycles Every Scrap of Steel
Transcript
- Lucas: So there's this steel mill in northern Sweden — in a town called Luleå — that claims it recycles 99.6 percent of all the metal scrap it generates during production. Luna: 99.6 percent? That's basically circular. How do they get that number? Lucas: Right. I mean, for context, the global average for steel scrap recycling in manufacturing is somewhere around 60 to 70 percent. The industry has always recycled — steel is one of the most recycled materials on earth — but the waste in the factory itself is usually a lot higher. Chips, trimmings, off-spec rolls, that kind of thing. Luna: So what's different about this mill? Is it a new technology or just a really disciplined process? Lucas: Both, honestly. The mill is owned by SSAB — Swedish steel company — and they invested heavily in what's called a closed-loop scrap system. Every piece of scrap, from the moment it's cut, falls onto a conveyor that goes straight to a shredder, then to a magnetic separator, then to an electric arc furnace. The whole thing is automated. Luna: So the scrap never leaves the building. That's the loop. Lucas: Exactly. Most factories send scrap to a recycler off-site. That adds trucking emissions, sorting costs, and you lose some material along the way. SSAB's system captures it immediately. They claim their yield loss — the material that actually goes to landfill — is less than half a percent. Luna: I want to pause on the economics. Because recycling scrap is cheaper than making new steel from iron ore, right? So this should save them money. Lucas: It does. SSAB estimates they save about $12 million a year just on raw material costs. But the upfront investment was significant — they spent around $40 million retrofitting the factory with the conveyor system and the new furnace. Payback period was about three and a half years. Luna: That's a solid return. And the carbon savings are even bigger. Because using an electric arc furnace instead of a blast furnace cuts CO2 per ton by about 70 percent. Lucas: That's the second part of the story. SSAB is also pursuing what they call 'fossil-free steel' using hydrogen, but that's a separate project. The scrap loop is already operational. And it's not just SSAB — some other mills in Europe are starting to copy the model. But the Luleå mill is the most advanced. Luna: Why hasn't this scaled everywhere? If the economics work and the carbon benefits are clear, what's holding other factories back? Lucas: A few things. First, not every mill has the space to install an in-house furnace and conveyor system. Second, the quality of scrap varies. If you're making high-strength steel for car bodies, you need very precise chemistry. Mixing scrap from different sources can introduce contaminants. SSAB solved that by keeping the scrap stream pure — they only recycle their own production scrap, not external scrap. Luna: So it's a closed loop in the truest sense. Only their own material. Lucas: Right. And that limits the model to factories that generate enough scrap internally to justify the investment. For a smaller factory, it might not make sense. But for large integrated mills, the math is getting better every year as carbon pricing increases. Luna: Speaking of which, there's a broader trend here. The EU's carbon border adjustment mechanism — the carbon tariff — is making steel producers pay more for emissions. So the incentive to reduce CO2 is only going up. Lucas: Absolutely. And that's where the 99.6 percent number starts to look like a competitive advantage. If you can produce steel with 70 percent lower emissions and lower raw material cost, you're in a strong position. Especially as automakers and construction companies start demanding low-carbon steel for their own ESG targets. Luna: Let's talk about the economics a bit more. You mentioned $12 million annual savings. But what about the carbon price? In Europe, carbon permits are around 80 euros per ton. If a blast furnace emits about two tons of CO2 per ton of steel, and an electric arc furnace emits about 0.6 tons, the savings per ton are around 112 euros. Lucas: Right. So on top of the raw material savings, you've got a carbon cost advantage. That adds up quickly when you're producing a million tons a year. The Luleå mill produces about 500,000 tons annually. So the carbon savings alone are roughly 56 million euros per year, compared to a conventional blast furnace. Luna: That's a huge number. But wait — is the electric arc furnace powered by renewable energy? Because if it's running on coal power, the carbon savings are much lower. Lucas: Good question. Sweden's grid is about 98 percent hydro and nuclear. So the electricity is already very low carbon. That's part of why SSAB located the mill there. If you tried this in Poland, where the grid is mostly coal, the savings would be smaller — maybe 40 percent instead of 70 percent. Luna: So geography matters. The model is replicable, but only in regions with clean electricity. Lucas: Exactly. And that's a real constraint. But there are other places — Canada, Norway, parts of the US with hydro — where it could work. Some US mills are already moving in that direction, like Nucor with its electric arc furnaces. But they still rely on external scrap, not a closed internal loop. Luna: That's the innovation here — the internal loop. Keeping the scrap pure and in-house. It's not just recycling, it's a manufacturing process redesign. Lucas: And it required rethinking the entire layout of the factory. The conveyor system had to be integrated into the production line, which meant shutting down the mill for several months during installation. That's a tough decision for any plant manager. Luna: But the payoff is clear. And it's not just about steel. Other metal industries — aluminum, copper — could benefit from similar systems. Have any tried? Lucas: Aluminum recycling is actually more advanced in some ways. The global recycling rate for aluminum is about 75 percent, and in some sectors like beverage cans, it's over 90 percent. But the closed-loop internal scrap system is less common. Most aluminum smelters still send scrap to external recyclers. SSAB's model could be a blueprint. Luna: It's interesting that the factory is in Sweden, a country with high environmental awareness. Do you think the cultural context helped? Or is it purely economic? Lucas: Probably a mix. Sweden has high carbon taxes and a strong industrial policy supporting green manufacturing. But the economic case was already strong. The $12 million annual savings alone would justify the investment. The carbon savings are a bonus that makes it even more attractive. Luna: So the lesson is: if you can integrate recycling into your production line, the cost savings and carbon benefits can be substantial. But it requires upfront capital and a long-term view. Lucas: And a willingness to rethink your factory layout. Not every plant can do it. But for those that can, it's a clear competitive advantage. And given the direction of carbon regulation, more companies are going to start looking at this model seriously. Luna: It also shows that incremental improvements — going from 60 percent scrap recycling to 99.6 percent — require systemic change, not just a better bin system. Lucas: Exactly. It's a whole new way of thinking about waste. And honestly, if this episode helped you think about your own work or factory operations in a new way, that's great. You know, if today's conversation was worth a coffee to you, there's a link where you can support the show: buy me a coffee dot com slash fexingo. Just a small way to keep these episodes ad-free and independent. Luna: Yeah, it's a tiny gesture that makes a real difference for us. And we appreciate it. Lucas: Anyway, back to the steel mill. One thing I didn't mention is that SSAB is now licensing this system to other mills. They've partnered with a German engineering firm to sell the conveyor-furnace package as a retrofit kit. Luna: So they're turning their competitive advantage into a new revenue stream. That's smart. Lucas: Yeah. They've already signed contracts with two mills in Germany and one in Brazil. The Brazilian mill is interesting because it's in a region with high hydropower, so the carbon savings are similar. Luna: So the model is spreading. That's encouraging. I wonder if we'll see a 99 percent recycling rate become the norm in steel manufacturing within a decade. Lucas: It's possible. But it will require investment and a shift in mindset. The technology exists. The economics are getting better. The question is whether the industry moves fast enough. Luna: And whether the political environment supports it. Carbon pricing and clean electricity are key enablers. Lucas: Right. So we'll keep watching. For now, SSAB's Luleå mill is a compelling case study in what's possible when you treat waste as a design problem, not an afterthought. Luna: Agreed. Thanks for digging into this one, Lucas. Lucas: My pleasure. Next time, we'll look at a factory in India that's using AI to reduce water usage in textile dyeing. That one is also impressive.