Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a Factory Is Making Steel from Methane
Transcript
- Lucas: So, there's a pilot plant in Texas that's claiming it can make steel from methane with a fraction of the carbon footprint. And it's not vaporware — they've actually got a working reactor. Luna: Steel from methane. That's a new one for me. I thought steel was basically coal and iron ore, end of story. Lucas: Right, that's the classic blast furnace route. But this process — it's called methane pyrolysis, or sometimes methane cracking — it splits natural gas into hydrogen and solid carbon. And the hydrogen then reduces the iron ore, instead of carbon monoxide from coal. Luna: So the carbon doesn't end up as CO2 in the atmosphere, it ends up as solid carbon that you can actually use? Lucas: Exactly. Instead of releasing carbon dioxide, you get a solid carbon black that can be used in tires, plastics, even construction materials. The company behind this pilot, they're called Monolith Materials, and they've been doing something similar for carbon black production for a while. But this is their first real foray into iron ore reduction. Luna: So how did they get from carbon black to steel? That feels like a leap. Lucas: Well, they've been working with a group out of MIT that's been developing a chemical looping process for direct reduced iron, or DRI. The idea is you use the hydrogen from methane pyrolysis to reduce the iron ore, and you avoid the big CO2 emissions entirely. Their pilot is small — I think it's producing a couple tons of iron a day — but the chemistry checks out. Luna: And the numbers? How much are we talking in terms of emissions savings? Lucas: They're claiming around a 90 percent reduction in CO2 compared to a traditional blast furnace. And that's not counting the fact that methane itself is a potent greenhouse gas if it leaks, which is a real concern. But if the natural gas is sourced responsibly and the process is contained, it could be a big deal. Luna: I mean, steel is responsible for like eight percent of global emissions, right? So even a 90 percent cut on a portion of that is massive. Lucas: Yeah, and that's why everyone's looking for a silver bullet. You've got hydrogen-based steelmaking being piloted in Sweden, you've got carbon capture on blast furnaces, and now this methane route. But the real question is economics. Can this compete with the traditional process? Luna: What's the cost difference right now? Lucas: Right now, green steel commands a premium of maybe 20 to 30 percent over conventional steel. But Monolith is hoping that selling the carbon black as a byproduct can help close that gap. If they can get good prices for the carbon black, the steel could become cost-competitive. Luna: So it's kind of a two-fer. You get clean steel and a useful material that would otherwise be made from oil. Lucas: Exactly. And that's why they've already got commitments from steelmakers in the US and Europe who want to test the iron in their furnaces. They're planning a bigger demonstration plant next year, aiming for maybe 100,000 tons of iron a year. That's when we'll see if it scales. Luna: But wait, isn't there a catch with methane? Like, methane is still a fossil fuel. Even if you're not emitting CO2, you're still drilling for natural gas. Lucas: That's a fair point. And the industry's aware of it. Monolith is actually looking into using renewable natural gas — from landfills or agricultural waste — to make the process truly circular. But even with fossil methane, it's a big step down in emissions because you're not burning it, you're splitting it. Luna: And the carbon black isn't going to end up in the atmosphere, it's going to be embedded in products. So it's kind of like carbon sequestration, but with a useful product. Lucas: Right. And that's the beauty of it. You're not just capturing carbon and burying it, you're turning it into something that has economic value. That's what makes this different from a lot of other decarbonization efforts in heavy industry. Luna: So what's the timeline? When could we see this actually replace a traditional blast furnace? Lucas: Look, I think we're looking at a decade at best, and that's optimistic. You've got to build the plants, get the supply chains in place, and convince the industry to adopt it. But the fact that there's a working pilot in 2026 is already ahead of where a lot of people thought we'd be. Luna: And it's not just Monolith. You've got Boston Metal doing that molten oxide electrolysis thing, using electricity to make steel. I've heard they're making good progress too. Lucas: Yeah, Boston Metal's approach is really interesting because it's electrified, so if you have clean electricity, it's zero carbon. But it's still in the pilot stage as well. The beauty of the methane route is that you don't need a massive electrical grid upgrade — you can plug into existing natural gas infrastructure. Luna: So it's a more practical bridge for the near term, maybe, but not the ultimate solution? Lucas: Potentially. But we need every tool in the box. The steel industry is so huge and so capital-intensive that no single technology is going to solve it. You need hydrogen, you need electrolysis, you need methane pyrolysis, and probably a few things we haven't thought of yet. Luna: It's good to see progress, though. I remember a few years ago, everyone was saying steel was impossible to decarbonize. Now we've got at least three viable paths. Lucas: And that's a big shift. As recently as 2020, the consensus was that steel was 'hard to abate' and we'd be stuck with coal for decades. Now you've got companies like Monolith and Boston Metal attracting serious investment, and even traditional steelmakers are setting net-zero targets. The momentum is real. Luna: Before we get too deep into the technology, I want to touch on something. This conversation about finding practical solutions in heavy industry — it's kind of what this podcast is about, right? Exploring the real-world innovations that can move the needle. Lucas: Absolutely. And if these conversations have given you a new idea or a fresh perspective in your own work, there's a simple way to keep them coming. If you're in a position to, you can support the show over at buy me a coffee dot com slash fexingo. It's a small thing, but it helps us stay ad-free and keep digging into these topics. Luna: Yeah, it's a way to ensure we can keep bringing you stories like this — the ones that don't always make the mainstream headlines. Lucas: Anyway, back to the steel. One thing I want to stress is that this isn't just about climate. There's a business case here. Steelmakers who can produce low-carbon steel are going to have a competitive advantage, especially as governments start implementing carbon tariffs. The EU's carbon border adjustment mechanism is already starting to bite. Luna: So it's not just environmental pressure, it's also economic. If you're a steelmaker and you can avoid paying those tariffs, that's millions in savings. Lucas: Exactly. And that's why I think we're going to see more investment in these technologies over the next few years. The cost of carbon is becoming real, and the technology is getting cheaper. It's a classic disruptive innovation scenario. Luna: What about the naysayers who say this is all greenwashing? That methane pyrolysis is just a way for the natural gas industry to stay relevant? Lucas: That's a cynical take, and there's some merit to it. But look at the numbers. If you can cut emissions by 90 percent, that's not greenwashing. And the fact that the byproduct is a valuable material rather than a waste stream — that's a fundamentally different approach. I think the proof will be in the scaling. If they can hit their targets, it'll be hard to dismiss. Luna: Fair enough. So what would make this a success story in five years? Lucas: For me, success would be a commercial-scale plant producing iron at a price that's competitive with conventional steel, without subsidies. And then seeing that replicated in other regions. If Monolith or Boston Metal can do that, it'll be a turning point for the whole industry. Luna: And it would be a great story to tell. A small company in Nebraska or Texas taking on the giants of steelmaking with a smarter chemical reaction. Lucas: Right. It's one of those innovations that seems obvious in hindsight, but it took a lot of chemistry and engineering to get there. And it's a reminder that sometimes the solutions aren't glamorous — they're just practical, economical, and cleaner. That's the kind of story we like to cover. Luna: Absolutely. And it gives me a bit of hope for the future of manufacturing. Lucas: Yeah, me too. Alright, that's all we have time for today. Thanks for joining us on The Manufacturing Podcast, and we'll catch you next time with another look at the factories and supply chains shaping our world.