When you spend as much time quoting custom metal fabrication projects as our estimating team does, you become well attuned to trends in material cost. One thing we’ve noticed recently is that galvannealed steel costs keep rising.
If your sheet metal design has specified galvannealed steel for years, it can be easy to assume it’s the best material for the job. However, taking a few minutes to think about your design’s real-world needs and whether they can be fulfilled by another material option can help you cut costs without sacrificing quality.
In some cases, galvannealed steel is still the best material for your application. But it’s also very possible that another, less expensive material will work just as well.
When Galvannealed Steel Is Worth Keeping
Despite its higher cost, galvannealed steel has advantages. Its zinc-iron coating provides corrosion protection and a surface that works well for painting or powder coating. It can also be useful for certain welding applications, particularly spot welding. Here are a few questions to ask about your sheet metal design to determine whether this material, or a comparable alternative, makes sense for your part:
- Will the part be painted or powder coated, and is coating adhesion important?
- Do appearance and finish consistency matter?
- How will the part be welded, and does the material affect that process?
- Are both corrosion protection and painted finish performance essential?
A “yes” to any one of these questions doesn’t automatically mean galvannealed steel is required. But when several of these requirements come together, or a customer specification calls for it, galvannealed may be the right choice. Common applications include automotive body panels, electrical enclosures, commercial doors, and painted industrial products.
Alternatives to Galvannealed Steel
The right material for your custom metal fabrication comes down to the application and end-use requirements. Here are a few materials we might recommend as alternatives to galvannealed steel if your sheet metal design allows for a material change.
Cold-Rolled Steel (CRS)
For appropriate indoor applications, cold-rolled steel often offers the greatest potential for material cost savings. It lacks galvannealed steel’s zinc coating (and the added cost that comes with it), so it’s generally best for indoor parts. Paint or powder coating can provide corrosion protection, but the part’s exposure and expected service life still matter.
Galvanized Steel (G60/G90)
Galvanized steel may be a good choice when zinc-based corrosion protection is needed. G60 and G90 refer to different zinc-coating weights, so the right choice depends on how the part will be used and exposed. Galvanized steel is frequently used for equipment housings, enclosures, structural components, and outdoor applications. If the part will be painted, galvanized steel may require more preparation than galvannealed steel to achieve the desired finish.
Hot-Rolled Steel (HRS)
Hot-rolled steel may be another lower-cost alternative for parts without tight dimensional tolerances or high surface-finish requirements.
Aluminum
When low weight, corrosion resistance, or fabrication needs favor aluminum, it’s worth evaluating whether it makes sense for the sheet metal design. However, aluminum isn’t necessarily less expensive, so it needs to be evaluated project by project.
Other Coated Steels
Depending on the application, electrogalvanized steel, Galvalume® and other aluminum-zinc-coated steels, or other zinc-coated sheet metal products from domestic mills may also be worth a look. These materials might be viable when corrosion resistance is important but galvannealed steel’s paintability advantages are not essential.
How to Evaluate a Material Change
If your sheet metal design currently specifies galvannealed steel and you’re interested in exploring alternative material options, it’s important to consider the environment, exposure, finishing needs, expected service life, cosmetic and structural requirements, and how the part must be formed and welded.
It’s also important to consider that the lowest material price doesn’t always produce the lowest overall part cost. A material change may necessitate changes to how the material is cut, bent, welded, and finished. It can also affect tooling, lead times, and material availability.
If your sheet metal design calls for galvannealed steel because the application requires it, then by all means, keep using it. But if it’s being used simply because that’s how it’s always been spec’d out, and no one has considered alternatives, it may be worth exploring your options.
At Nu-Way Industries, we’re happy to work with your engineering and purchasing teams to evaluate material alternatives based on your part’s actual requirements. Request a quote to get started.
