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Tree Grates Square

Square tree grates made from Corten steel stand out because of their unique rusting behavior. Unlike ordinary steel, the rust on Corten steel forms a protective, adherent patina that slows further corrosion, enhances longevity, and creates a natural reddish-brown aesthetic.

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Tree Grates Square

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Corten Steel Screen Fencing

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Product Details

Square tree grates made from Corten steel are widely used in urban landscaping because they combine durability, strength, and a distinctive aesthetic. One of the most notable features of Corten steel is the way it rusts naturally over time, which differs significantly from ordinary steel.

How Corten Steel Rust Differs from Ordinary Steel

Unlike mild carbon steel or galvanized steel, the rust formed on Corten steel has unique properties:

Feature	Corten Steel	Ordinary Carbon Steel
Rust Layer Formation	Forms a dense, adherent patina that slows further corrosion	Forms loose, flaky rust that continues to corrode the metal
Color	Warm, reddish-brown to dark brown	Orange-brown, uneven appearance
Protection	Acts as a protective barrier, reducing maintenance	No protection; rust continues to eat the steel
Longevity	Can last decades outdoors without painting	Requires painting or coating for long-term use
Maintenance	Minimal; natural weathering	High; needs regular anti-rust treatment

The patina of Corten steel forms over time as copper, chromium, and nickel in the alloy react with oxygen and moisture. This layer is tightly bonded to the surface, preventing moisture from penetrating and slowing further corrosion.

Advantages for Square Tree Grates

Durable Outdoor Performance
The protective patina allows square tree grates to withstand rain, snow, and foot traffic for many years.

Distinctive Aesthetic
The natural rust color gives sidewalks and urban landscapes a modern, industrial, and visually appealing look that evolves over time.

Low Maintenance
Unlike ordinary steel grates, Corten steel does not require painting, coating, or frequent replacement, reducing long-term costs.

Structural Strength
Even after rusting, the steel retains its mechanical strength, supporting pedestrian loads and occasional vehicular access.