Longda has a complete set of manufacturing and testing equipments, which are the most Advanced in the technical tube industry .Meanwhile, we have established an effective  quality management system with strong execution. We manufacture and control the products in accordance with ASTM (American Society  of  Testing Materials) & ASME(American Society of Mechanical Engineers) standards. 1.Copper & Copper Alloys Tube ASTM B75 ,ASTM B111, ASME SB75,ASME SB111 Chinese Standard : GB/T1527,GB/T 8890 DIN EN12451,DIN EN12449, EN10204 2.Carbon Steel Tube: ASTM A179 ,ASME SA179 ,ASTM A498,ASME SB498 3.Stainless Steel Tube :ASTM A213 ,ASTM A268   4.Titanium & Titanium Alloy Tube :ASTM B338, ASTMB861,ASME SB338 ,ASME SB861, GB/T 3624, GB/T 3625, EN17861 5.Aluminum Tube : ASTM B241 ,ASME SB241, GB/T 4436 , GB/T 4437.1 Extruded Copper-Aluminum Composite Fin Tube Fin Tube Material China GB ISO EN UNS JIS Copper TP2 Cu-DHP CW024A C12200 C1220 Copper TP1 Cu-DLP CW023A C12000 C1201 Admiralty Brass HSn70-1 CuZn28Sn1As CW706R C44300 C4430 Aluminum Brass HAl77-2 CuZn20Al2As CW702R C68700 C6870 Copper Nickel 90/10   BFe10-1-1   CuNi10Fe1Mn   CW352H   C70600   C7060 Copper Nickel 90/30   BFe30-1-1   CuNi30Mn1Fe   CW354H   C71500   C7150 Aluminum 1050A Al99.5 Al99.5 1050 A1050 Aluminum 1060 - Al99.6 1060 A1060 Aluminum Alloy 6061 - AlMg1SiCu 6061 A6061 Aluminum Alloy 6063 - AlMg0.7Si 6063 A6063 Range of Available Dimensions Extruded Double Metal Fin Tube /Extruded Copper-Aluminum Composite  Fin Tube OD (mm)   Fin Height (mm)   Base Tube Diameter (mm)   Fin-Pitch (mm)   Thickness of  Fin   Radiating     Area ( m2/m )   Finned Ratio (β)   Use Temperature (℃) 25 6.5 12 2 0.25 0.38 10.2 ≤150 28 7.5 12 2 0.25 0.42 11 ≤150 36 10 16 2.3 0.3 0.61 13.6 ≤150 36 10 16 2.5 0.3 0.77 13 ≤150 38 10 18 2.3 0.3 0.77 13.8 ≤150 38 10 18 2.5 0.3 0.79 13.1 ≤150 44 12.5 19 2.5 0.3 0.86 14.5 ≤150 44 12.5 19 2.8 0.3 0.89 13.7 ≤150 48 12.5 22 2.5 0.3 0.94 14.8 ≤150 48 12.5 22 2.8 0.3 0.90 14.2 ≤150 Application & Advantage xtruded Copper-Aluminum Composite Fin Tube (Base Tube Materials are Copper & Copper Alloy ) ,which fin tube is made of copper/ copper alloy tube and aluminum tube. The copper /copper alloy base tube is coated with an aluminum tube to extrude the aluminum fin , the root of the fin is tightly jointed with the outer wall of base tube. Good heat transfer  performance , high strength , excellent corrosion resistance .It is not easy deformation in the long-term cold thermal operating conditions and long service life. Overall extruded fin is smooth & burr-free, no obvious wrinkle ,easy  cleaning .Wet cooling is proceeding in heating and air conditioning engineering ,condensation water is easy to excluded. Especially non dust absorption and Anti-scaling in the drying, heating and other heat transfer occasion. Surface treatment by anode ,color beautiful, can prevent surface corrosion.  Compared with similar fins, extruded double metal fin tube is consist of more than 40% aluminum thus the base tube , that is protected against atmospheric corrosion well Very sturdy design resists mechanical damage as well Easy to clean with steam or water Different base tube materials for different requirements can be used with almost all chemically aggressive media Design: Fin material: aluminum (1060,1050,6061,6063) Base Tube Material: copper & copper alloy (C12200,C12000,C44300,C68700,C70600,C71500)  Base Tube OD: 12mm ～22mm ; Base Tube WT:1.0mm～4.0mm 0mm＜Length＜12000mm