CuNi 70/30 Copper Nickel Elbow 90° LR ASME B16.9 High Pressure Marine Pipe

Product Specification

CuNi 70/30 Copper Nickel Elbow 90° LR ASME B16.9 High Pressure Marine Pipe Fitting

The Copper Nickel Elbow is a pipe-directional fitting designed and manufactured in accordance with international standards including ASME B16.9, DIN 86090, GB/T 12459, and EEMUA 146. Common materials are CuNi90/10 (C70600) and CuNi70/30 (C71500), supplied in annealed (O) or stress-relieved condition. The elbows are formed by seamless tube hot-pushing or integral die-forging, ensuring continuous metal grain flow without wrinkles or cracks. Prior to dispatch, each piece undergoes dimensional inspection, visual examination, and specified non-destructive testing, accompanied by traceable heat numbers and mechanical property test reports. End finishes include butt-weld bevels (BW), socket-weld ends (SW), and threaded ends (NPT/BSP) to suit various piping interface requirements.

2.Product Applications

This product is suitable for liquid or gas piping systems whose design pressure does not exceed the allowable values for the corresponding temperature class. It is used as a standard directional component in the following engineering sectors:

Offshore Engineering: Seawater lift, firefighting, and cooling water loops on jack-up rigs, semi-submersibles, FPSOs, and subsea manifold systems.

Shipbuilding: Engine-room seawater systems, ballast tank lines, bilge and fire mains on both naval and commercial vessels.

Coastal Power Plants & Nuclear Stations: Open-cycle circulating cooling water, auxiliary cooling water, and condensate extraction piping turns.

Desalination Plants: Feed-water, brine concentrate, and product-water transmission lines in RO and MSF processes.

Chemical Industry: Medium- and low-pressure pipelines handling chlorides, organic acids, or neutral salt solutions, with service temperatures normally ranging from –29°C to 200°C.

3.Product Advantages

1. Strong Standard Compatibility: Key dimensional parameters (O.D., wall thickness, center-to-end, bevel angles) fully comply with ASME, EN, and GB systems, allowing direct replacement or connection to pipelines of different design codes without custom transition pieces.

2. Clear Design Allowances: Allowable stresses are derived from ASME Boiler & Pressure Vessel Code Section II Part D. A uniform corrosion allowance of 0.5–1.0 mm for 25-year service life can be explicitly calculated, providing reliable design basis.

3. Excellent Weldability: CuNi alloys offer a wide welding heat-input window (0.5–2.5 kJ/mm) with no preheat or post-weld heat treatment required. Weld beads are well-formed, and the corrosion resistance of the weld zone is not inferior to that of the base metal.

4. Stable Delivery Condition: All elbows are solution-annealed to relieve residual stresses, ensuring uniform microstructure and stable hardness ≤100 HRB, facilitating field cutting or grinding.

5. Comprehensive Quality Documentation: Each shipment is accompanied by an EN 10204 3.1 mill certificate (upgradeable to 3.2) covering chemical composition, ambient-temperature tensile properties, hardness, intergranular corrosion (per ASTM G28), and hydrostatic test results, meeting the documentation requirements of international engineering projects.

​4.Key Product Specifications

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