Carbon Steel (A36 / A500)
The most common fabrication material. Strong, weldable, machinable, and widely available in plate, sheet, tube, angle, and structural shapes. Takes powder coat and paint well. Not suitable for bare exposure in South Florida, will rust without a finish coat applied over proper primer.
- A36, standard plate and structural shapes (angle, channel, flat bar, I-beam)
- A500, structural tube (square, rectangular, and round hollow sections)
- Cost: lowest of the metals listed here
- Best for: interior work, painted or powder-coated exterior applications, structural members, most residential and commercial fabrication where a finish coat will be applied
Carbon steel is the right default material for most South Florida projects as long as the finish system is properly specified and applied.
Stainless Steel (304 / 316)
Corrosion-resistant by nature, the material itself provides protection without requiring paint or powder coat. The passive chromium oxide layer on the surface resists rust in most environments.
- 304, standard architectural stainless. Appropriate for interior handrails, commercial features, decorative panels, and most exterior applications away from saltwater
- 316 (marine grade), adds molybdenum for enhanced chloride resistance. Required for coastal and near-water applications, pool hardware, and any installation within a few hundred feet of the ocean
- Finishes available: brushed (most common), mirror-polished, electropolished
- Cost: significantly higher than carbon steel, typically 3x to 5x depending on form and thickness
- Best for: coastal railings, marine hardware, food service equipment, any application where a raw metal look is desired without a painted finish
Aluminum (6061 / 6063)
Lightweight, naturally corrosion-resistant, and a practical option for coastal environments where steel would require heavy finish maintenance or where weight is a constraint.
- 6061, a structural alloy with good machinability. Used for brackets, structural frames, and machined components
- 6063, better suited for extrusions and architectural profiles. Smoother surface finish than 6061
- Welding aluminum requires different equipment and technique than steel, TIG welding with appropriate filler, proper cleaning, and shielding gas. Not all fabrication shops can weld aluminum to a quality standard
- Finishes: anodizing and powder coat are the standard options. Anodizing is an electrochemical process that hardens the surface and is integral to the material, it does not chip or peel the way paint can
- Cost: higher than carbon steel, generally lower than stainless for equivalent structural cross-sections
- Best for: lightweight gates, marine and coastal railings, installations where reduced weight matters, environments where steel finish maintenance is not practical
Powder Coat Finish
The standard exterior finish for steel fabrication in South Florida. A thermoplastic polymer is sprayed electrostatically onto the prepared metal surface and cured at high temperature, forming a hard, continuous coating that bonds to the substrate.
- Applied over a primer, zinc-rich primer is recommended for exterior and near-coastal applications
- Broad color selection including full RAL palette and custom colors
- Resistant to UV, moisture, abrasion, and most chemical exposure when properly applied over clean, primed metal
- Touch-up is possible with matching color spray, though touch-ups are visible up close
- Failure mode: chips or damage that expose bare metal allow rust to creep under the coating, accelerated by salt air. Proper prep and prime coat are essential, powder coat applied directly to bare steel without adequate surface prep will fail early
- Service life with proper prep and application: 10 or more years in most South Florida conditions
Paint Finish
Appropriate for interior applications, specific aesthetic requirements, or structural steel in commercial construction where shop prime and field paint is the standard workflow.
- Standard exterior system: epoxy primer plus polyurethane topcoat
- Less UV-resistant than powder coat over time, topcoat chalking and color fade are expected in South Florida sun over several years
- More suitable for field touch-up and repair than powder coat, which requires oven curing
- Typically used for structural steel in commercial construction: shop-primed, field-painted after erection
- Not recommended for pool or near-water applications where powder coat provides better performance and easier maintenance
Hot-Dip Galvanizing
A sacrificial zinc coating applied by immersing fabricated steel in a bath of molten zinc. The zinc bonds metallurgically to the steel surface and provides galvanic protection, the zinc corrodes preferentially, protecting the underlying steel even if the coating is scratched or damaged.
- Provides excellent corrosion resistance in high-moisture, industrial, and marine-adjacent environments
- The coating is not decorative, it has a spangled, textured appearance that varies by batch
- Accepts paint or powder coat as a topcoat if an aesthetic finish is required, requires surface preparation before topcoating
- Appropriate for: structural steel, hardware, embed plates, anchor bolts, and any steel that will be buried, submerged, or in constant contact with moisture
- Cost and lead time: adds to fabrication cost and requires sending the completed fabrication to a galvanizing plant, typically adds several days to a week to the production schedule depending on plant queue
Not sure what to specify? Tell Fine Edge the environment, interior vs. exterior, distance from saltwater, expected maintenance frequency, and a material and finish recommendation will be included in the quote. There is no single right answer for every project; the right choice depends on the conditions, the budget, and how long the work needs to perform without attention.
Ready to Specify Your Project?
Use the quote form to describe your project and environment. Fine Edge will specify the right material and finish for the conditions.