Definition: Demijohns are a type of metal alloy that is composed of two or more layers of steel, each layer having a different thickness. They can be made from a variety of materials, including steel and aluminum, and are used in various applications such as automotive components, aircraft parts, and construction equipment. Demijohns are typically produced by melting the steel at very high temperatures, followed by cooling it to form a solid. They have a hardness that is similar to that of stainless steel,
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