Aluminum Brass Tube C68700

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Aluminum Brass tubes – C68700 - resists the action of high-velocity salt and blackish water and is commonly used for condenser tubes. The main characteristic of C68700 is its high resistance to impingement attack. Tubes of this alloys are recommended for use in Marine and Land Power Stations, in which cooling water velocities are high.

Standard Grade	ASTM B 111 C68700	EN 12451 CuZn20Al2As	DIN 17660/1785 CuZn20Al2	BS 2871 CZ 110	JIS H3300 C6870	GB/T8890 HAL77-2
Cu	76.0-79.0	76.0-79.0	76.0-79.0	76.0-78.0	76.0-79.0	76-79
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 Strength N/mm2	345 min.	390 min	-	-	373 min	370 min
	-	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	-	-
Typical use	Most used copper alloy for heat exchanger tubes application. Represents the best option for any heat exchanger which is involved with saline water. The addition of arsenic has solved the problem of dezincification. Melting Point: 935°C • Hot Working Properties: OK Density (20°C): 8,33 g/cm3 • Cold Working Properties: Very Good
Weight Formula	Average Wall: (OD-WT) x WT x 0,0265 = Kg/m (all sizes in mm) Minimum Wall: (OD-WT) x WT x 0,0275 = Kg/m (all sizes in mm)

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