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ASTM A500 straight seam submerged arc welded steel pipe is a straight seam steel pipe manufactured using the submerged arc welding process, and its standard complies with ASTM A500.

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.

DIN 17175 heat-resistant seamless steel pipe is a seamless steel pipe used in the boiler industry. It has high heat resistance and is commonly used in boilers, pressure vessels and other equipment that need to withstand high temperature and high pressure.

ASTM A213 is a standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes.