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A finned tube is a kind of heat exchange element. It is a kind of heat exchanger tube to improve the heat transfer efficiency, usually by adding fins on the surface of the heat exchanger tube to increase the external surface area (or internal surface area) of the heat exchanger tube, so as to achieve the purpose of improving the heat transfer efficiency.

EN 10219 S275J0H hollow section pipes are mainly used in outdoor steel fields such as building structures, bridges, vehicles, ships, containers, power plant chimneys, and railway engineering.

The hot expanding steel pipe is hot expanded seamless pipes, which is relatively low density but the contraction of the strong steel pipe (seamless pipe) can be referred to as thermal expansion.

ASTM A671 specification nominally covers pipe 16 in. (405 mm) in outside diameter or larger and of 1/4 in. (6.4 mm) wall thickness or greater.