ASTM B467 ASME SB467 UNS C70600 Welded Copper Nickel Pipe
90/10 Cu-Ni Alloy Pipe Corrosion-Resistant Copper Nickel Pipes for Marine, Offshore & Heat Exchanger Applications
ASTM B467 / ASME SB467 UNS C70600 welded copper nickel pipes are manufactured from 90/10 copper-nickel alloy, offering excellent resistance to seawater corrosion, biofouling, erosion, and chloride attack. Produced in accordance with ASTM B467 and ASME SB467, these welded Cu-Ni pipes provide reliable performance, long service life, and low maintenance in marine and seawater systems.
UNS C70600 welded pipes are widely used in shipbuilding, offshore platforms, desalination plants, power stations, and heat exchanger systems.
What Is ASTM B467 / ASME SB467?
ASTM B467 (ASME as SB467) is the standard specification for welded copper-nickel alloy pipe intended for general engineering, pressure, and corrosive service.
The standard defines requirements for:
-
Chemical composition
-
Mechanical properties
-
Manufacturing process
-
Heat treatment
-
Dimensional tolerances
-
Testing and inspection
ASTM B467 pipes are commonly specified for marine and heat exchanger applications involving seawater.
Material Grade: UNS C70600 (CuNi 90/10)
UNS C70600 is a 90% copper – 10% nickel alloy, sometimes referred to as CuNi 90/10, offering superior resistance to seawater corrosion compared to carbon steel and stainless steel in marine environments.
UNS C70600 Chemical Requirements
| TABLE 1 Chemical Requirements | |||||||
| Copper or Copper Alloy by UNS No | Copper (incl silver) | Nickel (incl Cobalt) | Lead, max | Iron | Zinc, max | Manganese | Other Named Alloys |
| C70600ᵃ | Remainder | 9.0–11.0 | 0.05 | 1.0–1.8 | 1.0 | 1.0 | — |
Product Form & Manufacturing
-
Product Type: Welded copper nickel pipe
-
Standard: ASTM B467 / ASME SB467
-
Welding Method: Electric resistance welded (ERW) or equivalent
-
Heat Treatment: Annealed after welding
Size Range & Specifications
-
Outside Diameter: 1/2″ – 48″
-
Wall Thickness: SCH 10 – SCH 80 (custom on request)
-
Length: Random length or fixed length
UNS C70600 Chemical Requirements
| TABLE 1 Chemical Requirements | |||||||
| Copper or Copper Alloy by UNS No | Copper (incl silver) | Nickel (incl Cobalt) | Lead, max | Iron | Zinc, max | Manganese | Other Named Alloys |
| C70600ᵃ | Remainder | 9.0–11.0 | 0.05 | 1.0–1.8 | 1.0 | 1.0 | — |
Mechanical Properties (Room Temperature – Typical)
| TABLE 2 Mechanical Requirements of As-Welded and Fully Finished Pipe When Furnished in the Annealed Temper (W061) | ||||
| Copper Alloy UNS No. | Outside Diameter, in. (mm) | Tensile Strength, min, ksi (MPa) | Yield Strength at 0.5% Extension Under Load, min, ksi (MPa) | Elongation in 2 in. (50.8 mm), min, % |
| C70600 | up to 4½ (114), incl | 40 (275) | 15 (105) | 25.0 |
| over 4½ (114) | 38 (260) | 13 (90) | 25.0 | |
| TABLE 3 Mechanical Requirements of Welded and Cold-Drawn and Fully Finished Pipe in Drawn Tempers | ||||
| Copper Alloy UNS No. | Outside Diameter, in. (mm) | Tensile Strength, min, ksi (MPa) | Yield Strength at 0.5% Extension Under Load, min, ksi (MPa) | Elongation in 2 in. (50.8 mm), min, % |
| C71500 | up to 2 (50.8), incl; wall thickness ≤0.048 in (1.21 mm) | 72 (495) | 50 (345) | 12.0 |
| for wall thicknesses over 0.048 in (1.21 mm) | 72 (495) | 50 (345) | 15.0 | |
| TABLE 4 Mechanical Requirements of As-Welded Pipe | ||||
| Copper Alloy UNS No. | Condition | Outside Diameter, in. (mm) | Tensile Strength, min, ksi (MPa) | Yield Strength at 0.5% Extension Under Load, min, ksi (MPa) |
| C70600 | welded from annealed strip | up to 4½ (114), incl | 45 (310) | 30 (205) |
| welded from cold-rolled strip | up to 4½ (114), incl | 54 (375) | 45 (310) | |
Heat Treatment
ASTM B467 UNS C70600 welded pipes are supplied in the annealed condition, ensuring:
-
Maximum corrosion resistance
-
Excellent ductility
-
Ease of bending and fabrication
Testing & Inspection
ASTM B467 / ASME SB467 pipes undergo comprehensive inspection, including:
-
Chemical analysis
-
Tensile testing
-
Eddy current or hydrostatic testing
-
Dimensional inspection
-
Visual inspection
-
Certification: EN 10204 3.1 / ASME MTR
Applications of UNS C70600 Welded Copper Nickel Pipes
-
Seawater piping systems
-
Shipbuilding and marine engineering
-
Offshore oil & gas platforms
-
Desalination and RO plants
-
Heat exchangers and condensers
-
Power plant cooling systems
C70600 vs C71500 Copper Nickel Pipes
| Item | C70600 (90/10) | C71500 (70/30) |
|---|---|---|
| Seawater Velocity | Moderate | Higher |
| Corrosion Resistance | Excellent | Superior |
| Strength | Good | Higher |
| Typical Use | General marine | Severe seawater |
ASTM B467 ASME SB467 UNS C70600 Welded Copper Nickel Pipe
ASTM B467 / ASME SB467 UNS C70600 welded copper nickel pipes provide outstanding corrosion resistance, durability, and cost-effective performance for marine, offshore, and seawater applications. Fully compliant with ASTM and ASME standards, CuNi 90/10 welded pipes are a proven solution for long-term service in harsh marine environments.
