C70600 Copper Nickel (90/10)

C70600 (C706) is a wrought copper-nickel alloy containing 10% nickel with important additions of iron and manganese. These additions are necessary to maintain good corrosion resistance, especially in marine salt water environments.

The main copper-nickel alloys chosen for seawater service contain 10% or 30% nickel. C70600 (90/10) is the more cost-effective option with excellent corrosion resistance.

Annealed (OS025) C70600 tube offers 42% elongation – ideal for bending and expanding into tube sheets. H55 temper offers higher strength for straight pipe runs.

Some of the primary uses for C70600 include copper nickel fittings (CuNi fittings) as well as condensers and exchanger shells.

Q1: What is the difference between C70600 (90/10) and C71500 (70/30) copper nickel?
A: C70600 (90/10) contains 10% nickel and is more cost-effective for general seawater service. C71500 (70/30) contains 30% nickel, offering higher strength and better erosion resistance at higher water velocities.

Q2: What is the JIS equivalent to ASTM B111 C70600 tube?
A: The JIS equivalent to ASTM B111 C70600 is C7060T per JIS H3300.

Q3: Can C70600 copper nickel 90/10 be used for automotive brake lines?
A: Yes, C70600 is used for automotive power steering tube and brake lines due to its corrosion resistance and formability.

Q4: What is the machinability rating of C70600?
A: C70600 has a machinability rating of 20 (UNS C36000 free-cutting brass = 100).

Q5: What is the thermal conductivity of C70600 copper nickel 90/10?
A: C70600 has a thermal conductivity of 26.0 Btu·ft/(hr·ft²·°F) or 45.0 W/m·K at 68°F.

Q6: Is C70600 suitable for salt water piping systems?
A: Yes, C70600 is widely used for salt water pipe fittings and salt water piping systems due to its excellent corrosion resistance.

Q7: What is the density of C70600 copper nickel 90/10?
A: C70600 has a density of 0.323 lb/in³ (8.94 g/cm³).

Q8: What is the melting point of C70600?
A: C70600 has a liquidus melting point of 2100°F (1149°C) and solidus of 2010°F (1099°C).

Q9: What are the standard specifications for C70600 condenser tube?
A: C70600 condenser tube is covered by ASME SB111, ASTM B111, ASTM B552, MIL-T-15005, and SAE J463/J461.

Q10: Can C70600 copper nickel 90/10 be welded?
A: Yes, C70600 can be welded using gas shielded arc welding (excellent), coated metal arc welding (good), and butt welding (excellent).

Q11: What is the electrical conductivity of C70600?
A: C70600 has an electrical conductivity of 9% IACS at 68°F.

Q12: What is the difference between C70600 and C7060T?
A: C70600 is the ASTM/UNS designation. C7060T is the JIS/KS designation for the same 90/10 copper nickel alloy.

Q13: Is C70600 used for propeller sleeves?
A: Yes, C70600 is used for propeller sleeves in marine applications due to its corrosion resistance and strength.

Q14: What is the yield strength of annealed C70600 tube?
A: Annealed (OS025) C70600 tube has a yield strength of approximately 16 ksi (110 MPa).

Q15: What filler metal is recommended for welding C70600?
A: For welding C70600, use AWS A5.7 ERCuNi filler metal.

GNEE inspects C70600 through a 5-step process:

Chemical verification – Spectrometer checks Cu, Ni, Fe, Mn per ASTM

Mechanical testing – Tensile, yield, elongation, flattening (tube), expansion (tube)

Non-destructive testing – Eddy current (ASTM E243) for tube; hydrostatic for pipe

Dimensional & visual check – OD, ID, wall, length, surface, ends

Documentation – Mill test report (MTR) with heat number traceability

C70600 tube is packaged for export:

Ends: Plastic caps on both ends

Protection: VCI paper or rust-prevention oil

Bundling: Hexagonal bundles with steel strapping

Overwrap: Woven polypropylene or PE film

Crating: Wooden crates or pallets (ISPM-15 compliant)

Labeling: Alloy, standard, dimensions, heat number, PO number

GNEE manufactures C70600 tube using:

Discuss Your Project Requirements