True Wrought Iron Versus Mild Steel

The steel in a new iron gate is the cheap part, and the hand forging and finishing is where the money goes, as the notes at carlsbad wrought iron gates inside michigan politics describe. Very few gates sold in Carlsbad, CA as wrought iron are made of true wrought iron at all. They are mild steel shaped to look like the old work, and knowing which one you have changes how the gate is repaired and protected.

What true wrought iron is

True wrought iron is an old material with fibers of slag running through it, worked by hand at a forge. It was the standard for gates and railings before mass produced steel. It resists rust better than plain steel because the slag fibers slow corrosion, but it is rarely made today and is found mostly on historic properties or salvage pieces.

What modern ornamental iron is

Modern gates use mild steel bar, square tubing and flat stock. The pickets are often tubing, the frame is tubing or solid bar, and scrolls are bent from flat bar or bought as cast pieces and welded on. Steel is stronger and more consistent than wrought iron, and much easier to weld.

Why the difference matters near the coast

Mild steel rusts quickly when bare. In the salt air near Carlsbad State Beach and the Agua Hedionda Lagoon, an untreated weld can show rust within a season. That is why modern gates depend on galvanizing and powder coat, while a true wrought iron piece is usually just painted and maintained.

Telling them apart

Wrought iron shows a grain like wood when it corrodes or is cut. Steel tubing is hollow and shows a seam inside the tube. Solid steel bar has a uniform cut face. A cast iron finial or panel is brittle and cracks rather than bending.

Repair and welding

Mild steel welds easily with ordinary equipment. True wrought iron needs more care to weld and to match. A historic gate in an older San Diego County neighborhood may be better repaired by a smith who works with the original material.