ASTM B111 C68700 Seamless Alumium Copper Alloy Tube For Condenser
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Aluminum Brass Tube - C68700 - Resists the action of high velocity salt and black water, commonly used in condenser tubes. The main feature of the C68700 is its high resistance to shock attacks. Tubes of this alloy are recommended for cooling marine and terrestrial power stations with high water velocities.
Our ASTM B111 C68700 tubes are widely used in surface condensers, heat exchangers and evaporators. They have high strength at high temperatures, excellent corrosion resistance and good creep resistance. C68700 has particularly good corrosion resistance in seawater
C68700 has particularly good corrosion resistance in seawater. C44300 and C68700 have good corrosion resistance. C68700 was annealed in the O61 temper. The lowest tensile strength is 345Mpa, and the lowest yield strength is 125Mpa.
C68700 has a density of 8.33g/cm3, 0.301lb/in.3
Typical Application of C68700 Aluminum Brass "As"
Industrial: condenser tubes, evaporator tubes, ferrules, still tubes, heat exchanger tubes
C68700 aluminum brass tubes are widely used in "seawater desalination plants"
Extended test
When expanded in accordance with Test Method B 153, pipe samples selected for testing shall withstand the expansion indicated in the standard. The expanded tube shall show no visible cracks or ruptures.
Hard-drawn tubes that have not been final annealed are exempt from this test. This test is required when the pipe is specified to be end annealed and should be performed on the annealed end of the sample pipe.
Tubing used for ferrule stock is not tested for expansion.
Flattening test
Test Method—Each test specimen shall be flattened in the press at three (3) locations along its length, with each new location being rotated approximately one-third of a turn on its axis from the last flattened area. Each flat area should be at least 2 inches in length. The flattened specimen shall allow free passage of a micrometer caliper set at three (3) times the wall thickness over the flattened area. The flat areas of the test specimens should be inspected for surface defects.
During inspection, the flat areas of the test specimen shall be free from defects, but defects that do not affect the properties of the intended application are acceptable.
Tubes for ferrule stock do not need to be flattened tested.
Residual Stress Test
Only copper alloys UNS numbers C23000, C28000, C44300, C44400, C44500, C60800, C61300, C61400 and C68700 require residual stress testing.
Unless otherwise specified, the manufacturer may choose to test the product by the Mercury Nitrate Test (Test Method B 154) or the Ammonia Vapor Test (Test Method B 858) as specified below.
Non-destructive testing
Eddy Current Test - Each tube shall be passed through an eddy current test apparatus adjusted to provide information on the suitability of the tube for the intended application. Testing shall follow the procedures in Practice E 243.
Hydrostatictest
Each tube shall withstand an internal hydrostatic pressure sufficient to subject the material to a fiber stress of 7000 psi [48 MPa] in the absence of evidence of leakage, as determined by the following equation for a thin hollow cylinder in tension The formula is determined. Unless otherwise specified, pipe need not be tested to hydrostatic pressures in excess of 1000 psi [7.0 MPa].
| UNS No. | C68700 – BSI No. CZ110 – ISO Name CuZn22AI2 |
| Chemical Comp. (%) | Cu 76 ~ 79 / Al 1.8 ~ 2.5 / Pb 0.07 / Fe 0.06 max / Zn rem / As 0.02 ~ 0.06 |
| ASTM Spec. | B 111, B 395 |
| ASME Spec. | SB 111, SB 395 |
| Applications | Condenser, Evaporator and Heat Exchanger tubes; Distiller tubing. |
| Temper | O61 Annealed |
| Properties * | Metric | British |
| Density | 8.33 g/cc | 0.301 lb/in³ |
| Tensile Strength, min. | 345 MPa | 50 ksi |
| Yield Strength, min. | 125 MPa | 18 ksi |
| CTE, linear | 18.5 10-6/°C @ 20.0 – 300 °C | 10.3 10-6/°F @ 70.0 – 570 °F |
| Specific Heat Capacity | 0.09 cal/g-°C @ 20ºC | 0.09 BTU/lb-°F @ 70ºF |
| Thermal Conductivity | 100.4 W/m-K @ 20.0 °C | 58 BTU/ft2/ft/h/°F @ 70.0 °F |
| Melting Point | 932 ~ 971 °C | 1710 ~ 1780 °F |
ASTM B111 C68700 Tube Chemical Composition
| Element | Weight % | | Copper | 76.0-79.0 | | Zinc | Reminder | | Aluminium | 1.8-2.5 | | Arsenic | 0.02-0.06 | | Lead | 0.07 | | Iron | 0.06 max | |
C68700 Brass Tubes Standard Specification:
| COUNTRY | STANDARD | NAME |
| ASTM | ASTM B111 | Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock |
| GB/T | GB/T8890 | Seamless Copper Alloy Heat Exchanger Tubes |
| BS | BS 2871 CZ110 | Copper and Copper Alloys Tubes |
| JIS | JIS H3300 | Copper and Copper Alloy-Seamless Pipes and Tubes |
| DIN | DIN1785 | Wrought Copper and Copper Alloy Tubes for Condensers and Heat Exchangers |
Mechanical Testing Such as Tensile of Area
- Hardness Test
- Chemical Analysis – Spectro Analysis
- Positive Material Identification – PMI Testing
- Flattening Test
- Micro and MacroTest
- Pitting Resistance Test
- Flaring Test
- Intergranular Corrosion (IGC) Test
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ASTM B111 C68700 Seamless Alumium Copper Alloy Tube For Condenser Images
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