Choosing between steel and aluminum is one of the most common decisions fabricators and contractors face. Getting it wrong affects cost, performance, and long-term maintenance. Neither material is universally better. Understanding the key differences helps any metal supplier in Minneapolis, MN, guide buyers toward the right outcome.
Weight and Strength: What the Numbers Actually Mean for Your Project
Aluminum weighs roughly one-third as much as steel, making it practical for anything that moves, gets lifted, or ships frequently. Steel is significantly stronger per unit of volume, making it the go-to for load-bearing frames and structural elements where mass adds stability. Aluminum can reach comparable strength through alloy selection and larger cross-sections, but that typically raises material cost.
How Does Minnesota’s Climate Affect the Choice of Metal?
Minnesota winters make corrosion resistance a serious consideration. Aluminum forms a natural oxide layer that protects it without any coating, which is why it is often specified for outdoor architectural work, municipal projects, and signage across the Twin Cities. Steel exposed to road salt and freeze-thaw cycles will corrode without galvanizing, paint, or a protective coating, adding upfront cost and ongoing maintenance requirements.
Common Outdoor Applications Where Aluminum Is Frequently Specified
- Handrails and railings in public spaces.
- Architectural trim and enclosures.
- Signage for municipal and commercial use.
- Mobile equipment and transport components.
- Marine applications near water exposure.
Weldability: A Practical Note for Saint Paul Fabricators
Steel is generally easier to weld for most shops. Aluminum requires different equipment and technique, including TIG welding and specific filler rods, which means not every fabrication shop in the Saint Paul area may be set up to handle it efficiently. Confirm the shop’s capabilities before specifying aluminum to avoid delays or additional subcontracting costs.
Cost Comparison: Material Price vs. Total Project Cost
Steel is typically lower cost per pound and per unit of strength. Aluminum commands a price premium, but weight savings can reduce total project cost in ways not always obvious at the quoting stage. Lighter material may mean smaller fasteners, a lighter support structure, and reduced shipping weight, all of which can offset the higher per-pound cost. Evaluating total installed cost, not just material cost, leads to a more accurate budget.
Common Applications by Material for Twin Cities Contractors
Steel is often chosen for:
- Structural frames and load-bearing elements.
- Heavy fabrication and trailer construction.
- Steel sheets, plates, and rebar for construction.
Aluminum is often chosen for:
- Enclosures, trim, and architectural panels.
- Handrails and mobile equipment.
- Outdoor signage and marine applications.
Contractors and fabricators serving Minneapolis, MN, benefit from working with a metal supplier who stocks both materials and understands the local climate and construction environment.,
Ready to Choose the Right Metal for Your Saint Paul Project?
North Second Street Steel, based in Minneapolis and serving Saint Paul and the wider Twin Cities area, carries both steel and aluminum across a wide range of shapes and sizes, including bars, sheets, plates, tubes, angles, and channels. The team has been advising Twin Cities contractors and fabricators for decades and can help match the right material to your application. Both materials are available for same-day walk-in pickup or delivery. Visit the Metal Supplier Services page to explore fabrication options, or contact the team to request a quote. Call (612) 522-6626 to speak with a team member today.