Wrought 90/10 & 70/30 Copper-Nickel buttweld fittings for seawater piping systems.
Material Overview
Copper-Nickel buttweld fittings — elbows, tees, reducers and caps — are welded directly to CuNi pipe for marine and offshore piping systems, offering the same corrosion resistance as the pipe itself with no dissimilar-metal joint.
Grades & Standards
Available grades and the manufacturing standards commonly applied to copper-nickel buttweld fittings.
Standards Explained
Technical Data
Nominal composition and typical mechanical properties for 90/10 & 70/30 Copper-Nickel buttweld fitting stock, per ASTM B466 (base pipe/tube spec referenced by ASTM B366 fitting manufacture).
Chemical Composition (% by weight)
| Grade | UNS No. | Cu | Ni (incl. Co) | Fe | Mn | Pb (max) |
|---|---|---|---|---|---|---|
| 90/10 Copper Nickel | C70600 | Remainder | 9.0 – 11.0 | 1.0 – 1.8 | 1.0 max | 0.05 |
| 70/30 Copper Nickel | C71500 | Remainder | 29.0 – 33.0 | 0.4 – 1.0 | 1.0 max | 0.05 |
Typical values per ASTM B466 Table 2. Mill test certificates issued per EN 10204 3.1 on request.
Mechanical Properties — 90/10 & 70/30
| Property | Annealed | Half-Hard / Drawn |
|---|---|---|
| C70600 Tensile / Yield | 275 / 105 MPa | 310 / 205 MPa |
| C71500 Tensile / Yield | 372 / 140 MPa | 414 / 275 MPa |
| Elongation (both grades) | 30 – 35% | 18 – 20% |
| Density (both grades) | 8.94 g/cm³ | 8.94 g/cm³ |
Typical values; exact temper confirmed at enquiry stage.
Dimensions
Center-to-end dimension (A) for 90° LR elbows = 1.5 × NPS; for 45° LR elbows (B) = A × tan 22.5°, per ASME B16.9. Equal tee center-to-end (C) = A.
| NPS | OD (in) | 90° Elbow — A (in) | 45° Elbow — B (in) | Equal Tee — C (in) |
|---|---|---|---|---|
| 1/2" | 0.840 | 0.75 | 0.31 | 0.75 |
| 3/4" | 1.050 | 1.13 | 0.47 | 1.13 |
| 1" | 1.315 | 1.50 | 0.62 | 1.50 |
| 1-1/4" | 1.660 | 1.88 | 0.78 | 1.88 |
| 1-1/2" | 1.900 | 2.25 | 0.93 | 2.25 |
| 2" | 2.375 | 3.00 | 1.24 | 3.00 |
| 2-1/2" | 2.875 | 3.75 | 1.55 | 3.75 |
| 3" | 3.500 | 4.50 | 1.86 | 4.50 |
| 4" | 4.500 | 6.00 | 2.49 | 6.00 |
| 6" | 6.625 | 9.00 | 3.73 | 9.00 |
| 8" | 8.625 | 12.00 | 4.97 | 12.00 |
Formula-derived reference values per ASME B16.9. Concentric & eccentric reducer lengths vary by NPS pair — full dimensional drawings with tolerances are issued with every order.
Send us your drawings, sizes and standards — our team will get back to you with a detailed quotation for your Copper-Nickel, Copper, Brass or Bronze piping requirement.
