ASTM B111 / B466 C70600 Marine Copper-Nickel Tube
C70600 Marine Copper-Nickel Tube also known as 90/10 Copper-Nickel, is a marine-grade alloy covered under ASTM B111 (seamless tubes) and ASTM B466 (welded tubes). It is widely used in seawater systems due to its excellent corrosion resistance, biofouling resistance, and mechanical durability.
Available C70600 Marine Copper-Nickel Tube Sizes
| Dimension Type | Typical Range |
| Temper/Hardness | O60,O82,H80,M |
| Outer Diameter | 6 mm --- 219mm (or custom) (¼” --8.625”) |
| Wall Thickness | 0.5 mm--- 10 mm |
| Length | Standard 1m/3 m / 6 m or coil form available |
Common C70600 Marine Copper-Nickel Tube Applications
| Application | Description |
| Seawater piping systems | Fire mains, bilge lines, ballast systems |
| Heat exchangers & condensers | Resistant to fouling and scaling |
| Desalination plants | Brine and process lines |
| Offshore oil & gas platforms | Cooling water and process tubing |
| Shipbuilding | Engine cooling systems, HVAC, chillers |
Key Features of ASTM B111/B466 C70600 Tubes
· Excellent resistance to seawater corrosion
· High resistance to erosion and biofouling
· Non-sparking and thermally stable
· Easy to fabricate, bend, and weld
· Suitable for high-velocity seawater up to 2.5–3.0 m/s
Mechanical Properties of ASTM B111/B466 C70600 Tubes
| Property | Typical Value (Annealed/O Temper) |
| Tensile Strength | ≥ 275 MPa (40 ksi) |
| Yield Strength (0.5% ext) | ≥ 105 MPa (15 ksi) |
| Elongation | ≥ 30% |
| Hardness (HRB) | 60–80 |
| Density | 8.94 g/cm³ |
C70600 Chemical Composition (per ASTM B111/B466)
| Element | Percentage (%) |
| Copper (Cu) | 88.6 – 90.6 |
| Nickel (Ni) | 9.0 – 11.0 |
| Iron (Fe) | 1.0 – 1.8 |
| Manganese (Mn) | ≤ 1.0 |
| Others | ≤ 0.5 (total) |
Global Standard and Availability
· C70600 is globally standardized (ASTM, ISO, GB/BFe10-1-1), ensuring easy supply chain access, interchangeability, and technical compliance.
· Supported by major shipyards, navy specifications, and classification societies (e.g., ABS, DNV, BV).
