The density of aluminized steel is 2710. Additionally, the
density of its counterpart, carbon steel, is slightly different at
2833.
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T1-25 and T1-40 are coated with the same coating, but T1-40 is a
heavier (thicker) coating weight. The US specification for
Aluminized Steel is ASTM A463, There are three US producers of
Aluminized Steel: AK Steel, Arcelor Mittal, and
Wheeling-Nisshin.
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I believe Aluminium = 2.7, and Carbon Steel = 7.85
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Aluminized steel is a favorite among many professionals for
baking pans. The thermal conductivity of aluminized steel allows it
to heat up evenly around all sides and the entire bottom. This
leads to a more even baking pattern and more consistency in the
product.
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Many are made with some type of nontoxic metal (usually a type
of aluminized steel) and then coated with Teflon making it a
nonstick surface.