90/10 Cupro-Nickel is a copper-nickel alloy that shows good resistant to stress corrosion.  Due to the addition of small amounts of iron and manganese, C706 CuNi is often used when an application will involve high-velocity
seawater.  90-10 Copper-nickel demonstrates good hot and cold working properties and is readily weldable.  Typical 90/10 CuNi application in the chemical and marine industries include tubes and tubesheets for condensers, evaporators and heat exchangers.  90/10 Copper-Nickel is inherently antimicrobial, making it a good choice for touch surface applications.

Marmetal stocks C706 90/10 Copper Nickel in Sheet, Plate, Bar, Pipe and Condenser Tube form, as well as Flanges, Fittings, Forgings and Castings.

Specifications for C706 90/10 Copper-Nickel

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
Mechanical Properties for for C706 90/10 Copper-Nickel

BAR – Round, Hex and Square
Commercial
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O60 All Sizes 38 15 30
H04 up to 3/8″ 60 38 10
over 3/8″ to 1″ 50 30 15
over 1″ to 3″ 40 15 30
over 3″ to 5″ 38 15 20
MIL-C-15726
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O60 All Sizes 38 15 30
H04 up to 3/8″ 60 38 10
over 3/8″ to 1″ 50 30 15
over 1″ to 3″ 40 15 30
SHEET/PLATE
Commercial
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
M20 / O25 up to 2-1/2″ 40 15 30
over 2-1/2″ 40 15 30
MIL-C-15726
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O60 up to 3/16″ 38 15 25
M20 Soft over 3/16″ 38 15 30
H01 up to 3/16″ x 24″ wide 55 30 10
H01 up to 3/16″ x over 24″ wide 47 25 10
M20 Hard up to 1/2″ x over 24″ wide 47 25 15
M20 Hard over 1/2″ to 3″ x all widths 40 17 20
M20 Hard over 3″ to 5″ x all widths 38 15 20
PIPE
Commercial
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O60 All Sizes 38 13 N/A
H80 All Sizes 50 40 N/A
MIL-T-16420
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O60 up to 4-1/2″ 38 15 30
over 4-1/2″ 38 13 30
TUBE
Commercial
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O61 All Sizes 40 15 N/A
MIL-T-15005
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
O61 All Sizes 40 15 N/A

 

Compositions for C706 90/10 Copper-Nickel

COMMERCIAL
UNS No. Copper + Silver Nickel + Cobalt Manganese Lead Iron Zinc Phosphorus Sulfur Carbon
C70600 remainder 9.0-11.0 1.0 max 0.05a max 1.0-1.8 1.0a
C70620 86.5 min 9.0-11.0 1.0 max 0.02 1.0-1.8 0.5 max 0.02 max 0.02 max 0.05 max
aFor subsequent welding application, max levels are: Zinc 0.50, Lead 0.02, Phosphorus 0.02, Sulfur 0.02, Carbon 0.05
MIL-C-15726
UNS No. Copper Nickel Manganese Lead Iron Zinc Phosphorus Sulfur Carbon Cu + plus elements with specific limits, min
C70600 86.5 min 9.0-11.0 1.0 max 0.02 1.0-1.8 0.5 max 0.02 max 0.02 max 0.05 max 99.5
MIL-T-16420
UNS No. Copper + Silver Nickel + Cobalt Manganese Lead Iron Zinc Phosphorus Sulfur Carbon Cu + plus elements with specific limits, min
C70600 86.5 min 9.0-11.0 1.0 max 0.02 1.0-1.8 0.5 max 0.02 max 0.02 max 0.05 max 99.5
MIL-T-15005
UNS No. Copper + Silver Nickel + Cobalt Manganese Lead Iron Zinc Phosphorus Sulfur Carbon
C70600 remainder 9.0-11.0 1.0 max 0.05 max 1.0-1.8 1.0 max
Physical Properties for C706 90/10 Copper-Nickel

Density @ 68o F 0.323 lb/in3
Melting Range 2010-2095o F
Hot Formability Good
Cold Formability Excellent
Machinability rating (C360 = 100) 20
Brazing Good
Soldering Excellent
Gas-shielded arc welding Excellent
Oxy-acetylene welding Not recommended
Carbon-arc welding Not recommended
Coated metal-arc welding Good
Resistant welding: spot and seam Good
Resistance Welding: butt Good
Applications for C706 90/10 Copper-Nickel

* Condensers
* Evaporators
* Tubesheets
* Valve Bodies
* Pump Bodies
* Impellers
* Fire Supression Systems
* Heat Exchangers
* Fasteners
* Fittings
* Flanges
* Architectural
* Antimicrobial Surfaces