How OEMs Are Converting Steel Parts to Aluminum (And Which Extruders Make It Work)

If you're an OEM engineer still spec'ing steel for structural or semi-structural components, you've likely already heard the pitch for aluminum. But there's a difference between knowing aluminum is lighter and actually understanding how to convert a steel part — without compromising load performance, assembly fit, or unit cost.

That's where the right extrusion partner changes everything. Aluminum extrusion isn't a drop-in swap. The geometry, alloy selection, temper, and secondary processing all need to work together to match or exceed what your steel component was doing. When that alignment happens, the results are hard to argue with: weight reductions of 50–65%, labour savings from reduced component count, and tooling costs that are a fraction of stamping dies.

This post breaks down what to look for in an aluminum extruder when you're evaluating a steel-to-aluminum conversion, and why the partner you choose matters as much as the material itself.

Why Steel-to-Aluminum Conversion Is Accelerating

The push isn't new, but the urgency is. Lightweighting mandates across automotive, transit, and industrial equipment have moved from “nice to have” to hard engineering targets. The global automotive aluminum extrusion market is projected to reach $10.1 billion USD by 2034, growing at a 7.2% CAGR — and OEMs are driving that demand.

The reasons are well-established:

• Weight reduction: aluminum extrusions typically deliver 50–65% weight savings over equivalent steel components
• Consolidation: a single extruded profile can replace multiple stamped and welded steel parts, reducing assembly complexity
• Corrosion resistance: aluminum doesn't rust, which matters for automotive underbody, transit frames, and outdoor industrial applications
• Recyclability: aluminum retains 95% of its value at end of life, supporting sustainability targets that OEM procurement teams now track closely

But here's what the general pitch often skips: not every steel component converts cleanly. Wall thickness, load direction, fastening points, and thermal behaviour all factor in. That's why the extruder's engineering capability is the deciding variable.

What to Look for in an Aluminum Extrusion Partner

Not all extruders are set up to handle conversion projects. Some are high-volume commodity shops — great if you already have a finalized profile, less useful if you're still figuring out how to translate a steel weldment into a single extruded cross-section.

Here's what separates a capable conversion partner from a vendor who just runs billets:

Design and Engineering Support

The best conversion projects start with a conversation about function, not a drawing. An extruder who can review your steel assembly, identify consolidation opportunities, and propose a profile geometry that meets your load and fit requirements is worth far more than one who simply quotes what you send them. Look for: in-house die design, FEA capability or partnerships, and engineers who ask about your application before quoting.

Alloy and Temper Expertise

6061-T6 isn't always the right answer. Depending on your application, 6063, 6005A, or 7000-series alloys may be more appropriate. An extruder who defaults to one alloy for everything is a flag. The alloy selection directly affects yield strength, machinability, weldability, and surface finish — all of which matter in OEM applications.

Value-Added Services Under One Roof

This is where a lot of OEMs get surprised by project timelines. If your extruder ships raw profiles to a separate facility for CNC machining, then to another for anodizing, then to another for assembly — you've added weeks and multiple quality handoffs. The most efficient conversions happen when fabrication, machining, and finishing are integrated.

Production Scalability

Prototype volumes and production volumes are different problems. An extruder who can support your initial conversion run but can't scale when your program ramps is a short-term solution. Confirm press capacity, lead times at volume, and whether they run multiple shifts before committing.

How Dajcor Aluminum Approaches Steel-to-Aluminum Conversion

We've been doing conversion work for OEMs across automotive, transit, medical, and renewable energy for years — and the projects that go smoothest are the ones where we get involved early.

Our process starts before the die is cut. When an OEM brings us a steel assembly they want to convert, we look at the whole picture: how the part is loaded, where it fastens, what tolerances matter, and whether there's an opportunity to consolidate multiple pieces into one profile. That last point is often where the biggest cost savings come from, not just the material switch itself.

What we bring to a conversion project:

• Custom die design and tooling: we design and own the tooling, so you're not paying a third party or waiting on an outside die shop
• Alloy selection guidance: we'll recommend the right alloy and temper for your load requirements, not just the most common one
• Integrated fabrication and machining: CNC machining, drilling, punching, and cutting happen in-house, after extrusion
• Automated anodizing: our in-house anodizing line means consistent surface finish without the logistics of shipping parts out
• Assembly and kitting: for OEMs who want a ready-to-install component, not just a raw profile

We work across a range of press sizes, which means we can handle both small precision profiles and larger structural sections. And because we're a Canadian manufacturer, lead times and supply chain conversations are simpler for OEMs sourcing domestically.

The Aluminum Extruders Council outlines the core principles of design-for-extrusion — and our team applies those principles at the quoting stage, not after a die is already built.

Starting Your Conversion Project

Steel-to-aluminum conversion projects move faster when the extruder is involved at the design stage. Waiting until you have a finalized drawing before calling your extrusion partner means you've already locked in decisions that could have been optimized.

The best time to bring us in is when you're still asking “can this be done in aluminum?” — not after you've already answered it yourself. If you have a steel component or assembly you're evaluating for conversion, contact Dajcor to start the conversation. Bring the part, the application context, and your volume targets. We'll take it from there.

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