... Suotai Mechanical & Electric Equipment Co., Ltd. Designs and manufactures all kinds of finned tubes. 1, finned tube function: heat transfer;2, ... L (winding type), high frequency welding;3, fin tube materials: 1, base tube: carbon steel, stainless steel, copper, copper alloy, ... , high frequency welding), copper (winding type).4, finned tube specifications: 1, base tube: OD16, OD19, OD1 ", OD38; 2, fin: ...