Material Characteristics Analysis of Outdoor Weathered Bol Corten Steel Fire Pit Table / BBQ

I. Core Material: Intrinsic Properties of Corten Steel

Material Definition and Composition

Scientific Name: Weathering Steel, commonly known as Corten Steel, a low-alloy steel designed with alloying elements (such as copper, phosphorus, chromium, nickel, etc.) to possess self-passivating anti-rust capabilities.

Typical Composition Examples (slightly varying by grade):

Carbon (C): ≤0.12%, ensuring ductility and weldability;

Copper (Cu): 0.25–0.5%, Phosphorus (P): 0.07–0.15%, promoting oxide film formation;

Chromium (Cr): 0.4–0.8%, Nickel (Ni): 0.2–0.5%, enhancing corrosion resistance.

Physical Performance Advantages

Strength and Toughness: Yield strength ≥345MPa (common carbon steel ~235MPa), capable of withstanding high-temperature combustion and heavy impacts without deformation;

Weight and Thickness: Common thickness 3–6mm, weighing about 1/3 of cast iron for easy handling and installation, while meeting structural strength (e.g., 1.2m×0.8m fire pit table bears ≥200kg).

 

 

 

 

 

 

 

II. Weather Resistance: Mechanism of the Self-Protective "Rust Layer Armor"

Oxide Film Formation Process

Initial Stage (1–3 months): Exposed to a humid environment, the surface gradually forms reddish-brown rust, with the initial rust layer being loose and porous;

Stable Stage (3–6 months): Under the action of oxygen, moisture, and alloy elements, the rust layer transforms into a dense γ-FeOOH (hydroxyferric oxide) passivation film, approximately 0.1–0.3mm thick, preventing oxygen and moisture from further penetrating the substrate.

 

 

 

 

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