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ASTM B111 / ASME SB111 UNS C71500 with Aluminum Fins Copper Nickel Alloy Bimetallic Finned Tube
A copper-aluminum composite finned tube, also known as a bimetallic finned tube, is a type of heat exchanger tube that is constructed by bonding copper and aluminum materials together. It is designed to enhance heat transfer efficiency in various heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems.
Copper-aluminum composite finned tubes consist of an inner tube made of copper and outer fins made of aluminum. The fins are tightly bonded to the copper tube by using advanced bonding technologies such as explosion bonding or roll bonding. The copper tube provides good thermal conductivity, while the aluminum fins enhance heat transfer by increasing the surface area.
| Standard Dimensions - Bimetallic Tubes | |||||||||
| Outside Diameter | Outside Thickness | Inner Thickness | Length | Ferrule Length | |||||
| (mm) | (inch) | (mm) | (BWG) | (mm) | (BWG) | (m) | (ft) | (mm) | (inch) |
| 6.00 ~ 114.30 | ½"~4.5" | 0.711 ~7.21 | 22 ~ 2 | 0.51~ 3.05 | 25 ~ 11 | 0.3~20 | 1 ~ 66 | 0 ~ 500 | 0~ 20 |
| Materials - Bimetallic Tubes | ||
| Outer Tube | Inner Tube | Ferrules |
| SA 179 / A 179 - Carbon Steel | SA 179 / A 179 - Carbon Steel | SA 179 / A 179 - Carbon Steel |
| SA 214 / A 214 - Carbon Steel | SA 214 / A 214 - Carbon Steel | SA 214 / A 214 - Carbon Steel |
| SA 213 / A 213 - Stainless Steel | SA 213 / A 213 - Stainless Steel | SA 213 / A 213 - Stainless Steel |
| SA 312 / A 312 - Stainless Steel | SA 312 / A 312 - Stainless Steel | SA 312 / A 312 - Stainless Steel |
| SB 111 / B 111 - Copper & Cu Alloys | SB 111 / B 111 - Copper & Cu Alloys | SB 111 / B 111 - Copper & Cu Alloys |
| SB 523 / B523 - Zirconium & Zr Alloys | SB 523 / B523 - Zirconium & Zr Alloys | SB 523 / B523 - Zirconium & Zr Alloys |
| SB 338 / B338 - Titanium & Ti Alloys | SB 338 / B338 - Titanium & Ti Alloys | SB 338 / B338 - Titanium & Ti Alloys |
| Material Designation | Corresponding Material Symbol | ||||
| GB/T8890 | ASTM B111 | BS2871 | JIS H3300 | DIN1785 | |
| Copper Nickel | BFe10-1-1 | C70600 Pipe | CN102 | C7060 | CuNi10Fe1Mn |
| BFe30-1-1 | C71500 Pipe | CN107 | C7150 | CuNi30Mn1Fe | |
| (BFe30-2-2) | C71640 | CN108 | C7164 | CuNi30Fe2Mn2 | |
| (BFe5-1.5-0.5) | C70400 | – | – | – | |
| B7 | – | – | – | – | |
| Aluminium Brass | HAL77-2 | C68700 Tube | CZ110 | C6870 | CuZn20Al2 |
| Admiralty Brass | HSn70-1 | C44300 Tube | CZ111 | C4430 | CuZn28Sn1 |
| Boric Brass | Hsn70-18 | – | – | – | – |
| HSn70-1 AB | – | – | – | – | |
| Arsenical Brass | H68A | – | CZ126 | – | – |
| Brass Tubes | H65/H63 | C28000/C27200 | CZ108 | C2800/C2700 | CuZn36/CuZn37 |
Copper Nickel tubes, CUNI 70/30 – C71500 – the best resistance of any of the copper alloys to impingement attack and to corrosion from most acids and waters. It is being used in severe corrosive conditions in which service lives longer than those of other copper alloys are desired.
Inspections and Tests: Bimetallic Tubes
Chemical Composition
Mechanical Properties
Hydrostatic Test
Pneumatic Test
Pulling Test
Boroscopic Inspection
Eddy Current Test
Applications
