If you’ve ever stood beneath the hood of a car, truck, or even an electric vehicle (EV) and stared at the interconnected metal parts that make it run, chances are good you’ve glanced at an automotive casting. For more than 20 years, I’ve stood on the floor of our production facility, watched molten aluminum and cast iron take shape in precision dies, and talked to hundreds of original equipment manufacturers (OEMs) and tier-1 suppliers about what they actually need from a casting partner. A common question I get is this: “What are the real market demands for automotive castings right now, beyond just ‘more parts’?” The answer isn’t as simple as it was 10 years ago, when we were mostly churning out engine blocks and transmission housings. Today, the market is shifting at a pace I haven’t seen since the transition from carburetors to fuel injection in the 1990s, and as a casting supplier, we’ve had to adapt every part of our operation to keep up. Let’s break down what that means, from the factory floor to the boardrooms of the biggest automakers in the world. Automotive Castings
First, and most impactful, is the massive, ongoing shift to electric vehicles (EVs) and the way that’s redefining what a casting is supposed to do. Ten years ago, 90% of our castings went to internal combustion engine (ICE) components—cylinder heads, intake manifolds, crankshafts. Today, that number is closer to 40%, and it keeps dropping every quarter. The EV revolution isn’t just about replacing an engine with a battery; it’s about entirely new vehicle architectures that rely far more on large, complex castings than ICE ever did. Take structural castings, for example. A decade ago, structural castings were mostly small parts: bracket mounts, suspension components that held other parts in place. Now, automakers like Tesla, Ford, and Volkswagen are using what they call “gigacastings”—single, large aluminum castings that replace 70 or 80 smaller stamped and bolted parts on a vehicle’s chassis. That’s a huge demand shift, and it’s not just about size. Gigacastings need to be extremely lightweight, stiff, and free of internal defects that could cause structural failure in a crash. We used to test every casting for surface flaws; now we’re doing 100% internal X-ray and ultrasonic testing on these large structural parts, because one tiny porosity flaw in a 2-meter-long casting could be a safety hazard.
But it’s not just about size. EVs also need castings for battery components that have to meet extremely strict thermal and electrical requirements. The battery tray, which holds the lithium-ion packs, is a critical part: it needs to be lightweight to maximize range, durable enough to withstand road debris and crashes, and thermally conductive to keep batteries from overheating. A few years ago, we were working on a prototype battery tray that required a new aluminum-silicon alloy we’d never used before. Our metallurgists had to spend six months testing it to make sure it wouldn’t corrode when exposed to road salt or moisture, and that it could be manufactured without cracking during the casting process. That’s a far cry from the gray iron engine blocks we made in the 2000s, where the main demand was just “make it heavy enough and cheap enough.” The EV shift has also created a demand for lower-volume, higher-complexity parts for new startups and legacy automakers launching their first EV lines. A startup might need a custom inverter housing, which is a small but highly precise casting that has to fit around delicate electronic components, and they might only need 5,000 of them a year. Ten years ago, we would have turned down that volume as too small to be profitable, but today, we’ve invested in flexible casting lines that can handle low volumes of complex, high-margin EV parts while still running high-volume gigacasting orders.
The second big market demand I see every day is for better material efficiency and sustainability. Automakers used to care mostly about two things: part performance and cost. Now, sustainability is baked into every part of the supply chain, and castings are a huge part of that. Let’s be honest: casting is an energy-intensive process. Melting metal, heating dies, running furnaces—all of that uses a lot of electricity or natural gas, and until recently, most of the metal we used was virgin ore from mines. Now, customers are asking for castings made with a higher percentage of recycled metal, and they want to see proof of that. A few years ago, we switched our entire aluminum casting line to 95% post-consumer recycled aluminum. We worked with a local scrap yard to sort and process the aluminum, and we track every batch from scrap yard to finished casting, so we can give our customers a certificate that says exactly how much recycled metal is in their parts. That’s not just a nice-to-have; many automakers have set strict carbon neutrality goals, and their supply chains have to meet those goals too. If a casting supplier can’t prove their parts have a lower carbon footprint, they lose the contract.
Sustainability also means reducing waste. Traditional casting processes can generate a lot of scrap metal—parts that have defects, or sprues (the extra metal that feeds into the die) that get cut off and recycled. A few years ago, our scrap rate was around 5%. Today, it’s less than 1.5%, because we invested in new simulation software that lets us test the flow of molten metal in a die before we even build the tool. That software cuts down on design flaws that cause defects, and it also reduces the amount of metal we need to use, because we can optimize the die design to minimize sprues and overflow. Customers love that, because lower scrap means lower material costs for them, and lower waste means a better sustainability profile. We’re also seeing demand for castings that are easier to recycle at the end of a vehicle’s life. Many ICE castings are made of mixed materials, like steel with rubber seals or coatings that make it hard to separate the metal when the car is scrapped. Now, customers are asking for single-material castings, or coatings that don’t contaminate the metal so it can be melted down and reused for new parts. That’s a small detail, but it’s a growing requirement from regulators in the EU, China, and the U.S., which are pushing for higher rates of vehicle recycling.
Third, the market demands greater precision and shorter lead times than ever before. A decade ago, it could take six months or longer to get a new casting line set up, from designing the die to testing the first production parts. Today, automakers are launching new models every three to four years, and they need parts fast. That means we have to be able to design, test, and produce new castings in half that time—or less. Last year, we worked with a major German automaker to develop a new suspension casting for their midsize EV. They gave us the design specs in January, and we had the first production parts to them in April. How did we do that? We combined 3D printing for prototype dies with that simulation software I mentioned earlier. Instead of waiting 10 weeks to machine a steel die for prototypes, we 3D printed a sand die that could be used in our casting line to make test parts in days. That cuts the prototyping time way down, and it means we can catch design flaws earlier, before we invest in a permanent die.
Precision is also non-negotiable now. EV parts, especially the ones that hold batteries or electronics, have to fit within a fraction of a millimeter of their design specs. If a battery tray is just a millimeter too small, it can’t hold the battery pack, and a suspension casting that’s even slightly out of spec can cause handling issues or even safety problems. We’ve had to invest in new metrology equipment, like 3D coordinate measuring machines (CMMs) that can scan a finished casting and compare it to the digital design in minutes, instead of hours. We also have in-line inspection stations on every production line, so if a casting is out of spec, we catch it before it leaves the facility. Ten years ago, we inspected every 10th part; now, we inspect every single part, because the cost of a defective part getting to an automaker is way too high. We’ve seen customers cancel contracts over parts that were just slightly out of spec, because their assembly lines shut down if a part doesn’t fit. That’s why precision isn’t just a selling point—it’s a table stake now.
I’d be remiss if I didn’t mention the demand for supply chain resilience, which has been a top priority since the chip shortage of 2020 and 2021. Back then, many automakers had only two or three suppliers for critical castings, and when one had a shutdown, production came to a halt. Now, automakers are asking their casting suppliers to have redundant capacity, and to be able to scale production quickly. For example, a customer might place a year-long order for 100,000 structural castings, but they might need 50,000 extra in a quarter if demand for their EV spikes. We’ve invested in flexible production lines that can switch between different casting types quickly, and we keep extra die sets on hand for our most common parts, so we don’t have to wait weeks to machine a new die if we need more capacity. We also work with two different metal suppliers for every type of casting, so if one supplier has a delay, we can switch to the other without disrupting production. That’s a big shift from just a few years ago, when we’d lock in a single metal supplier for a low price. Now, reliability and resilience matter more than a small per-unit cost savings.
Of course, none of these demands would matter if we didn’t also keep an eye on cost. Automakers are always under pressure to keep vehicle prices down, and castings are a big part of that. That means we have to balance all these other requirements—complexity, sustainability, lead time—without driving up costs too much. It’s a delicate line, but it’s one we’ve gotten good at over the past few years. For example, when we invested in that simulation software, it cost us a lot upfront, but it cut our scrap rate so much that we saved money in the long run, and we could pass some of those savings on to our customers. When we switched to recycled aluminum, we had to pay a small premium for the certified recycled material at first, but as we built relationships with scrap processors, we were able to bring that premium down to almost zero, and now we’re actually saving money compared to virgin metal, because recycled aluminum uses far less energy to melt.
I talk to other casting suppliers all the time, and a lot of them are struggling with these demands. The shift to EVs is huge, and the pressure to be sustainable, precise, and resilient is only going to get stronger. But for us, that’s just part of the job. For more than 20 years, we’ve adapted to every shift in the automotive market, from fuel injection to SUVs to now EVs. We’re not just a supplier of metal parts—we’re a partner to our customers, helping them solve problems and meet their goals, whether that’s launching a new EV model that goes farther on a charge or hitting their carbon neutrality targets.
If you’re an OEM or tier-1 supplier looking for a casting partner that understands these market demands, whether you need gigacastings for a new EV chassis, battery trays, precision suspension parts, or anything in between, we’re here to work with you. We can help you design parts to be more efficient, more sustainable, and produced faster than you thought possible. Reach out to start a conversation about your casting needs, and let’s build something together.
Rail Transit Castings References
Automotive Casting Market Size, Share & Trends Analysis Report by Material (Aluminum, Iron), by Product (Engine, Transmission, Structural), by Vehicle Type, by Region, and Segment Forecasts, 2024-2030
Global Electric Vehicle Battery Manufacturing Equipment Market Report, 2023-2030
Sustainability in Automotive Supply Chains: Global Regulatory Trends and Industry Practices, 2022
Automotive Manufacturing Lead Time Reduction: Digitalization and Simulation Impact, 2023
Qingzhou Shengchen Machinery Technology Co., Ltd.
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