Steel has low, medium or high carbon, with most metal furniture being made with low carbon because it is cheaper than a higher grade of carbon. However, its lightness makes for an ideal poolside furniture and is mainly used for benches, folding chairs and swing sets. Although they’re as strong as paint finishes, they do not hold up as well as electroplated finishes. Brass finishes should be oiled or clear-coated with polyurethane or a similar material to make a barrier from air and water to prevent corrosion. For example, if you live in a rainy area, you will want furniture with heavy waterproofing and light enough to carry indoors.

Furniture metal finish

metal furniture

Iron and steel products are extensively used in many application, ranging from office furnishings to outdoor settings. Metal furniture is a popular choice of furnishings, especially used outdoors for decks and patios.

Made of an alloy of carbon, iron and other metals, its main reason for its strength is because of chromium, which protects from rust and corrosion because of its thin film of oxide on the surface.

Chrome plating, although durable, is thin and if damaged where it is exposed to air, scratches can rust. To decide if a finish is solid brass put a magnet on the furniture and if it clings, it is made of brass-plated steel (iron in the steel is magnetic). Anodized finishes are used on aluminum furniture to increase the thickness of the aluminum oxide layer, creating a thicker barrier between the atmosphere and aluminum base metal.

Source: https://en.wikipedia.org/wiki/Furniture