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2. Fire pit - Wikipedia

   en.wikipedia.org/wiki/Fire_pit

   A fire ring is a construction or device used to contain campfires and prevent them from spreading and turning into wildfires. [citation needed] A fire ring is designed to contain a fire that is built directly upon the ground, such as a campfire. Fire rings have no bottom, and are simply circles made of forged metal, stones, concrete, etc. which ...

3. Hot-dip galvanization - Wikipedia

   en.wikipedia.org/wiki/Hot-dip_galvanization

   Galvanised hand rail Crystalline surface of a hot-dip galvanized handrail, known as "spangle" Protective effect: completely rusted letter box mounted to a hot-dip galvanized wall Steel strip coming out of the zinc pot of a continuous vertical hot-dip galvanizing line. Hot-dip galvanization is a form of galvanization.

4. Corrugated galvanised iron - Wikipedia

   en.wikipedia.org/wiki/Corrugated_galvanised_iron

   Corrugated galvanised iron roofing in Mount Lawley, Western Australia A corrugated iron church (or tin tabernacle) in Kilburn, London Corrugated iron in the Cobar Sound Chapel, used both for the roof and as the formwork for the concrete interior Typical corrugated galvanised iron appearance, with visible large flake type patterns.

5. Pitting corrosion - Wikipedia

   en.wikipedia.org/wiki/Pitting_corrosion

   The process of pit nucleation is initiated by the depassivation of the protective oxide layer isolating the metal substrate from the aggressive solution. The depassivation of the protective oxide layer is the less properly understood step in pitting corrosion and its very local and random appearance probably its most enigmatic characteristic.

6. Chimney - Wikipedia

   en.wikipedia.org/wiki/Chimney

   Metal liners may be stainless steel, aluminum, or galvanized iron and may be flexible or rigid pipes. Stainless steel is made in several types and thicknesses. Type 304 is used with firewood, wood pellet fuel, and non-condensing oil appliances, types 316 and 321 with coal, and type AL 29-4C is used with high efficiency condensing gas appliances.

7. Steel - Wikipedia

   en.wikipedia.org/wiki/Steel

   The density of steel varies based on the alloying constituents but usually ranges between 7,750 and 8,050 kg/m 3 (484 and 503 lb/cu ft), or 7.75 and 8.05 g/cm 3 (4.48 and 4.65 oz/cu in). [ 8 ] Even in a narrow range of concentrations of mixtures of carbon and iron that make steel, several different metallurgical structures, with very different ...