ASME B16.9 90 Degree CuNi 70/30 Elbow Sch40 Butt Weld Pipe Fittings for Marine Industry

ASME B16.9 90 Degree CuNi 70/30 Elbow Sch40 Butt Weld Pipe Fittings for Marine Industry

1.Product Description

The Copper Nickel Elbow is a pipeline directional fitting manufactured from copper-nickel alloys, primarily in grades UNS C70600 (90/10 copper-nickel) and UNS C71500 (70/30 copper-nickel). The product features a curved arc structure with standard bend angles of 45°, 90°, and 180°, with custom angles also available per engineering drawings. The elbow curvature radius is classified as Long Radius (R=1.5 × nominal diameter) and Short Radius (R=1.0 × nominal diameter).

Manufacturing processes include seamless push‑forming, hot extrusion, and medium‑frequency induction bending, ensuring dense microstructure and uniform wall thickness. End connections are available as Butt‑Weld (BW), Socket‑Weld (SW), and Threaded (NPT/BSP) types to suit various piping system installation requirements. All products are manufactured and inspected in strict compliance with ASME B16.9, DIN 86090, and EEMUA 146 international standards, guaranteeing dimensional interchangeability and consistent quality worldwide.

2.Product Applications

With excellent corrosion resistance and durability, Copper Nickel Elbows are widely used in the following industrial sectors:

• Shipbuilding and Marine Engineering: Seawater cooling systems on all vessel types, ballast water treatment lines, firewater piping, deck wash systems; offshore platform riser systems, subsea pipeline expansion bends; cooling lines on offshore wind power facilities.

• Petrochemical Industry: Oil and gas transmission lines in refineries, chemical plant brine wastewater treatment piping, oil/gas mixed transmission lines on offshore production platforms, FPSO topside module process piping.

• Power and Nuclear Industry: Circulating cooling water lines for thermal power plant condensers, nuclear facility equipment cooling water systems, closed cooling loops in combined-cycle gas/steam turbine power plants.

• Desalination Projects: Brine recirculation lines in Multi-Stage Flash (MSF) and Multi-Effect Distillation (MED) units, Reverse Osmosis (RO) pre-treatment lines.

• General Industry and Civil Use: Large-scale central air conditioning chilled water systems, pharmaceutical purified water and water-for-injection distribution lines, sanitary-grade piping in food and beverage industries, municipal district cooling and heating networks.

3.Product Advantages

1.Outstanding Seawater Corrosion Resistance
Copper-nickel alloys form a dense, highly adherent cuprous oxide (Cu₂O) protective film in flowing seawater, which possesses self-healing properties. C70600 exhibits a uniform corrosion rate ≤0.025mm/year in seawater, while C71500 achieves ≤0.018mm/year, with service life reaching 20~30 years—far exceeding coated carbon steel solutions (typically requiring replacement every 3~5 years).

2. Natural Anti-Biofouling
Continuous copper ion release creates a micro-toxic environment on the pipe surface, effectively inhibiting attachment of barnacles, mussels, algae, and other marine organisms. This eliminates the need for antifouling coatings, offering environmental benefits while substantially reducing maintenance frequency and cleaning costs.

3. Excellent Mechanical Properties
C70600 at room temperature: Tensile≥290MPa, Yield≥110MPa, Elongation≥30%; C71500: Tensile≥370MPa, Yield≥130MPa, Elongation≥30%. The material exhibits outstanding toughness with strong resistance to water hammer impacts and mechanical vibration.

4. Superior Weldability
High compatibility when welding to same-grade copper-nickel pipes, suitable for TIG, MIG, or SMAW processes. Preheating and post-weld heat treatment are generally unnecessary. Weld corrosion resistance is verified to be at least equivalent to the base metal.

5. Outstanding Lifecycle Economics
Although initial procurement cost is higher than carbon steel, the extended service life, low maintenance requirements, and elimination of coating replacement result in total operational and maintenance costs that are 60-70% of coated carbon steel systems—offering significant long-term economic advantages.

6. Comprehensive Sizes and Flexible Delivery
Size range covers DN15 to DN600, with wall thickness from Sch5S through XXS available across the full product line. Custom orders for non-standard sizes, special wall thicknesses, and non-standard angles are accepted with short delivery lead times.

​

​4.Key Product Specifications

FAQ

1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.

2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.

4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.