Description

C71500 Cupro-Nickel, a 70/30 copper-nickel alloy, offers outstanding resistance to stress corrosion, making it highly dependable in demanding environments. The addition of small amounts of iron and manganese enhances its performance in high-velocity, polluted seawater conditions, ensuring longevity and durability. Widely utilized across various industries, especially in chemical processing and desalination, this alloy is valued for its exceptional corrosion resistance and strength. Common applications include tubes and tube sheets for condensers, evaporators, and heat exchangers, as well as seawater transport tubes, valve bodies, pump components, and impellers. C71500 is renowned not only for its durability but also for its excellent workability, formability, and weldability, which facilitate fabrication and installation. Its combination of mechanical properties and corrosion resistance makes it an ideal choice for marine, industrial, and seawater-related applications where reliability, performance, and longevity are critical.

Available Shapes for C71500 70/30 COPPER NICKEL:

Sheet
Plate
Bar
Pipe
Tube
Forging
Flange
Castings
Fittings

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	ASTM	ASME	Military
Bar	ASTM B151	ASME SB-151	MIL-C-15726
Forging			MIL-C-24679
Sheet	ASTM B171	ASME SB-171	MIL-C-15726
Plate	ASTM B171	ASME SB-171	MIL-C-15726
Pipe	ASTM B466	ASME SB-466	MIL-T-16420
Tube	ASTM B111	ASME SB-111	MIL-T-15005

BAR – Round, Hex and Square
Commercial
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O60	up to 1/2″	52	18	30
		over 1/2″ to 1″	48	18	30
		over 1″	45	18	30
	H01	up to 1/2″	65	50	10
		over 1/2″ to 1″	60	45	15
		over 1″ to 3″	55	35	20
		over 3″ to 5″	45	18	20
MIL-C-15726
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O60	All Sizes	45	18	30
	H01	up to 1/2″	65	50	10
		over 1/2″ to 1″	60	45	15
		over 1″ to 3″	55	35	20

SHEET/PLATE
Commercial
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	M20 / O25	up to 2-1/2″	50	20	30
		over 2-1/2″	45	18	30
MIL-C-15726
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O60	up to 3/16″	50	20	30
	M20 Soft	over 3/16″ to 2-1/2″	50	20	30
	M20 Soft	over 2-1/2″	45	18	35
	H01	up to 3/16″ x 24″ wide	60	30	10
	H01	up to 3/16″ x over 24″ wide	55	25	10
	M20 Hard	up to 1/2″ x over 24″ wide	50	22	15
	M20 Hard	over 1/2″ x all widths	45	18	20

PIPE
Commercial
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O60	All Sizes	52	18	N/A
	H80	All Sizes	70	45	N/A
MIL-T-16420
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O60	up to 4-1/2″	50	18	30
		over 4-1/2″	50	16	30

TUBE
Commercial
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O61	All Sizes	52	18	N/A
MIL-T-15005
	TEMPER	SIZE	TENSILE, KSI, MIN	YIELD@0.5%, KSI, MIN	Elong. % Min
	O61	All Sizes	52	18	N/A

UNS No.	Copper + Silver	Nickel + Cobalt	Manganese	Lead	Iron	Zinc	Phosphorus	Sulfur	Carbon
C71500	remainder	29.0-33.0	1.0 max	0.05a max	0.40-1.0	1.0a
C71520	65.0 min	29.0-33.0	1.0 max	0.02	0.40-1.0	0.5	0.02 max	0.02 max	0.05 max

UNS No.	Copper	Nickel + Cobalt	Manganese	Lead	Iron	Zinc	Phosphorus	Sulfur	Carbon	Cu + plus elements with specific limits, min
C71500	65.0 min	29.0-33.0	1.0 max	0.02 max	0.40-1.0	0.50 max	0.02 max	0.02 max	0.05 max	99.5

UNS No.	Copper + Silver	Nickel + Cobalt	Manganese	Lead	Iron	Zinc	Phosphorus	Sulfur	Carbon	Cu + plus elements with specific limits, min
C71500	65.0 min	29.0-33.0	1.0 max	0.02 max	0.40-1.0	0.50 max	0.02 max	0.02 max	0.05 max	99.5

Copper Nickel

C71500 70/30 Copper Nickel

Strength and Performance in Extreme Environments

Available Shapes for

C71500 70/30 Copper Nickel

Applications for

C71500 70/30 Copper Nickel

Description

Reviews

Density @ 68o F	0.323 lb/in3
Melting Range	2140-2265o F
Hot Formability	Good
Cold Formability	Good
Machinability rating (C360 = 100)	20
Brazing	Excellent
Soldering	Excellent
Gas-shielded arc welding	Excellent
Oxy-acetylene welding	Good
Carbon-arc welding	Not recommended
Coated metal-arc welding	Good
Resistant welding: spot and seam	Good
Resistance Welding: butt	Good