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ASTM B111 C68700 Aluminum Brass Seamless U Bend Tube for cooling and heating
ASTM B111 C68700 is a specification for seamless copper alloy U bend tubes, specifically made from aluminum brass. These tubes are commonly used in heat exchangers and condensers due to their excellent corrosion resistance, high thermal conductivity, and good strength. The U bend shape allows for easy installation and routing of the tubes in heat exchange systems.
C68700 Aluminum Brass U Bend Tubes are a popular choice for heat exchangers due to several reasons:
Corrosion resistance: The tubes have excellent corrosion resistance properties, which make them suitable for use in marine environments and other corrosive applications.
Thermal conductivity: C68700 tubes have high thermal conductivity, which allows for efficient heat transfer.
Formability: These tubes are easily formed into U bend shapes, which makes them easy to install and route in heat exchange systems.
Strength: C68700 tubes have good strength properties, which make them suitable for use in high-pressure applications.
Cost-effective: These tubes are cost-effective compared to other materials such as stainless steel or titanium, making them a popular choice for heat exchanger applications.
Specification
| Standard Grade | ASTM B111 C68700 | EN 12451 CuZn20Al2As | DIN 17660/1785 CuZn20Al2 | BS 2871 CZ 110 | JIS H3300 C6870 | GB/T 8890 HAL 77-2 |
| Cu | 76.0-79.0 | 76.0-79.0 | 76.0-79.0 | 76.0-78.0 | 76.0-79.0 | 76.0-79.0 |
| Al | 1.8-2.5 | 1.8-2.3 | 1.8-2.3 | 1.8-2.3 | 1.8-2.5 | 1.8-2.5 |
| Fe | 0.06 max | 0.07 max | 0.07 max | 0.06 max | 0.06 max | 0.06 max |
| Pb | 0.07 max | 0.05 max | 0.07 max | 0.07 max | 0.07 max | 0.03 max |
| Zn | Bal. | Bal. | Bal. | Bal. | Bal. | Bal. |
| As | 0.02-0.10 | 0.02-0.06 | 0.02-0.035 | 0.02-0.06 | 0.02-0.06 | 0.03-0.06 |
| P | - | 0.01 max | 0.01 max | - | - | 0.02 max |
| Mn | - | 0.1 max | 0.1 max | - | - | - |
| Total Impurities | - | 0.3 max | 0.1 max | 0.3 max | - | 0.3 max |
| Condition | O61 | R390 | F39 | M | O | M |
| - | R340 | F34 | TA | - | Y2 | |
| - | - | - | O | - | - | |
| Yield Strength N/mm2 | 125 min | 150 min | 150-230 | - | - | - |
| - | 120 min | 120-180 | - | - | - | |
| - | - | - | - | - | - | |
| Tensile trength N/mm2 | 345 min. | 390 min | - | - | 373 min | 370min |
| - | 340 min | - | - | - | 350 min | |
| - | - | - | - | - | - | |
| Elongation (%) | - | 45 min | 45 min | - | 40 min | 40 min |
| - | 55 min | 55 min | - | - | 50 min | |
| - | - | - | - | - | - | |
| Hardness Hv5 | - | - | - | 150 min | - | - |
| - | - | - | 85-110 | - | - | |
| - | - | - | 75 max | - | - |
Chemical requirements
| Copper or copper alloy UNS No. | Copper | TIN | Al | Ni incl Co | Pb max | Fe max | Zn max | Mn max | As | Sb | P max | Cr | Other |
| C44300 | 70.0-73.0 | 0.9-1.2 | 0.07 | 0.06 | remainder | 0.02-0.06 | |||||||
| C44400 | 70.0-73.0 | 0.9-1.2 | 0.07 | 0.06 | remainder | 0.02-0.10 | |||||||
| C44500 | 70.0-73.0 | 0.9-1.2 | 0.07 | 0.06 | remainder | 0.02-0.10 | |||||||
| C60800 | remainder | 5.0-6.5 | 0.1 | 0.1 | 0.02-0.35 | ||||||||
| C61300 | remainder | 0.20-0.50 | 6.0-7.5 | 0.15 max | 0.01 | 2.0-3.0 | 0.1 | 0.2 | 0.015 | ||||
| C61400 | remainder | 6.0-8.0 | 0.01 | 1.5-3.5 | 0.2 | 1 | 0.015 | ||||||
| C68700 | 76.0-79.0 | 1.8-2.5 | 0.07 | 0.06 | remainder | 0.02-0.06 | |||||||
| C70400 | remainder | 4.8-6.2 | 0.05 | 1.3-1.7 | 1 | 0.30-0.80 | |||||||
| C70600 | remainder | 9.0-11.0 | 0.05 | 1.0-1.8 | 1 | 1 | |||||||
| C70620 | 86.5 min | 9.0-11.0 | 0.02 | 1.0-1.8 | 0.5 | 1 | 0.02 | C.05 max S.02 max | |||||
| C71000 | remainder | 19.0-23.0 | 0.05 | 0.50-1.0 | 1 | 1 | |||||||
| C71500 | remainder | 29.0-33.0 | 0.05 | 0.4-1.0 | 1 | 1 | |||||||
| C71520 | 65.0 min | 29.0-33.0 | 0.02 | 0.4-1.0 | 0.5 | 1 | 0.02 | C.05 max S.02 max | |||||
| C71640 | remainder | 29.0-32.0 | 0.05 | 1.7-2.3 | 1 | 1.5-2.5 | C.06 max S.03 max | ||||||
| C72200 | remainder | 15.0-18.0 | 0.05 | 0.50-1.0 | 1 | 1 | 0.30-0.70 | Si.03 max Ti.03 max |
Mechanical Properties
| Form | Temper | Temper Code | Tensile Strength (ksi) | YS-0.5% Ext (ksi) | Elongation (%) | Rockwell B scale | Rockwell F scale | Section Size (in) | Cold Work (%) |
| Flat Products | As Hot Rolled | M20 | 55 Typ | 20 Typ | 45 Typ | 35 Typ | - | 1 | |
| Rod | 1/2 Hard | H02 | 75 Typ | 70 Typ | 15 Typ | 80 Typ | - | 1 | 20 |
| Tube | Nominal Grain Size 0.025 mm | OS025 | 60 Typ | 25 Typ | 45 Typ | 45 Typ | 80 Typ | - | - |
| Nominal Grain Size 0.035 mm | OS035 | 54 Typ | - | 45 Typ | 36 Typ | 77 Typ | - | - |
Applications
ASTM B111 UNS C68700 Seamless Copper Alloy U bend tubes are commonly used in various applications such as:
Heat exchangers: These tubes are used in heat exchangers for transferring heat from one fluid to another.
Condensers: The excellent corrosion resistance and high thermal conductivity of these tubes make them suitable for use in condensers.
Power plants: These tubes find their application in power plants for cooling systems.
Marine industry: The tubes are used in seawater piping systems due to their excellent resistance to corrosion.
HVAC systems: ASTM B111 UNS C68700 Aluminum Brass U Bend Tubes are used in heating, ventilation, and air conditioning (HVAC) systems for their thermal conductivity properties.
