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Copper Nickel

Copper Nickel

C71500 70/30 Copper Nickel

Strength and Performance in Extreme Environments

70/30 Cupro-Nickel (C71500 CuNi) is a high-strength copper nickel alloy recognized for its superior resistance to corrosion, erosion, and stress cracking in seawater and marine environments. With higher nickel content than 90/10, it offers enhanced mechanical strength and exceptional stability in turbulent or high-velocity seawater. The addition of iron and manganese improves overall performance and durability. C71500 is easily fabricated, welded, and formed, making it ideal for tubing, condensers, heat exchangers, and desalination systems. Combining strength, corrosion resistance, and reliability, 70/30 Copper Nickel is the trusted choice for demanding marine, offshore, and industrial applications requiring long-term performance.

Available Shapes for

C71500 70/30 Copper Nickel

Plate
Plate
Sheet
Sheet
Bar
Bar
Pipe
Pipe
Tube
Tube
Casting
Casting
Forging
Forging
Flange
Flange

Applications for

C71500 70/30 Copper Nickel

Condensers
Evaporators
Fire Supression Systems
Heat Exchangers
Impellers
Pumps
Tubesheets
Valve Parts

Description

70/30 Cupro-Nickel (C71500 CuNi) is a high-strength copper nickel alloy recognized for its superior resistance to corrosion, erosion, and stress cracking in seawater and marine environments. With higher nickel content than 90/10, it offers enhanced mechanical strength and exceptional stability in turbulent or high-velocity seawater. The addition of iron and manganese improves overall performance and durability. C71500 is easily fabricated, welded, and formed, making it ideal for tubing, condensers, heat exchangers, and desalination systems. Combining strength, corrosion resistance, and reliability, 70/30 Copper Nickel is the trusted choice for demanding marine, offshore, and industrial applications requiring long-term performance.

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  • Specifications
  • Mechanical Properties
  • Composition
  • Physical Properties
  • Applications
C71500 70/30 Copper Nickel Download PDF   PDF
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

COMMERCIAL

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

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 + 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

MIL-T-16420

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

MIL-T-15005

UNS No. Copper + Silver Nickel + Cobalt Manganese Lead Iron Zinc Phosphorus Sulfur Carbon
C71500 remainder 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
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
* Condensers
* Evaporators
* Tubesheets
* Valve Bodies
* Pump Bodies
* Impellers
* Fire Supression Systems
* Brake Lines
* Heat Exchangers
* Fasteners
* Fittings
* Flanges