UNS C71500 CuNi 70/30 Copper Nickel Elbow, Seamless 90° LR ASME B16.9 High Strength Fitting

UNS C71500 CuNi 70/30 Copper Nickel Elbow, Seamless 90° LR ASME B16.9 High Strength Fitting

1.Product Description

The Copper Nickel Elbow is a seamless wrought fitting manufactured from dual‑phase copper‑nickel alloys with controlled iron and manganese additions. The material offers a single‑phase α‑solid solution structure after solution annealing, providing excellent metallurgical stability. Products are available in two primary alloy compositions: 90/10 (UNS C70600) and 70/30 (UNS C71500), with the latter offering higher nickel content for enhanced resistance in high‑velocity, high‑temperature seawater conditions. Manufacturing routes include hot extrusion, induction bending, and cold pushing, followed by full solution heat treatment and pickling.

2.Product Applications

This fitting is specified for critical fluid systems where chloride‑induced corrosion and erosion are primary failure mechanisms. Typical system integrations include:

• Seawater cooling loops for main engines and auxiliary equipment

• Firemain and sprinkler systems aboard naval and commercial vessels

• Heat exchanger interconnecting piping in LNG and power generation facilities

• High‑salinity brine transfer lines in zero‑liquid‑discharge (ZLD) plants

• Subsea umbilical and flowline components for oil & gas extraction

• Ballast water treatment (BWT) system piping subject to IMO D‑2 standards

3 · Product Advantages

• Erosion‑corrosion resistance – Critical flow velocity threshold > 4.5 m/s for C70600 and > 6 m/s for C71500 in clean seawater.

• Low macro‑galvanic potential – Compatible with steel when properly insulated; minimal galvanic coupling with titanium and super duplex.

• Fabrication friendly – Cold bendable without cracking (minimum bend radius 2.5D for cold forming); weld joint efficiency ≥ 90% of base metal.

• Proven long‑term data – Extensive service track record > 40 years in naval and offshore applications.

• Repairable – Can be weld‑overlaid or internally clad without compromising base properties.

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​4.Key Product Specifications

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