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DIN 86090 CuNi 90/10 Elbow C70600 Copper Nickel Pipe Fitting
The DIN 86090 CuNi 90/10 Elbow is a copper-nickel butt weld fitting designed for copper-nickel alloy piping systems. The elbow provides a controlled change in piping direction while maintaining a welded connection suitable for continuous-duty piping installations.
Product Overview
CuNi 90/10 fittings are commonly associated with CuNi10Fe-based copper-nickel alloys, including related designation UNS C70600, which are widely used in marine, seawater and other corrosion-resistant piping systems. The exact material designation and chemical composition should be confirmed against the applicable purchase specification.
Manufactured according to DIN 86090, the fitting can be supplied in different elbow angles, dimensions and wall thicknesses according to project requirements.
Technical Specifications
Item
Specification
Product Name
CuNi 90/10 Copper Nickel Elbow
Product Type
Butt Weld Elbow
Standard
DIN 86090
Material
Copper Nickel Alloy
Grade
CuNi 90/10 / CuNi10Fe-based
Related UNS Grade
C70600*
Copper-Nickel System
Cu-Ni-Fe-Mn
Connection Type
Butt Weld
Elbow Angle
45° / 90° / Customized
Manufacturing
Formed / Seamless or welded construction according to specification
Size
Customized / According to DIN 86090
Wall Thickness
Matching pipe specification
End Preparation
Butt weld end
Surface
Mill finish / Pickled or customized
Heat Treatment
According to material and production requirements
Inspection
Dimensional, visual and material inspection
* C70600 should be treated as a related material designation rather than an automatic one-to-one equivalent. The chemical composition should be checked against the actual DIN 86090 material grade before claiming exact equivalence.
DIN 86090 Standard
DIN 86090 is specifically associated with copper-nickel alloy elbows for butt welding into copper-nickel alloy pipelines.
The standard is relevant to applications where the fitting needs to maintain compatibility with copper-nickel piping systems and their welding configuration.
Key considerations include:
Elbow dimensions
Outside diameter and wall thickness
Elbow radius
Butt-weld end preparation
Material designation
Delivery condition
Dimensional tolerances
For project orders, the fitting dimensions should be specified together with the corresponding pipe size and wall thickness.
CuNi 90/10 Material
CuNi 90/10 copper-nickel alloy is widely selected for piping systems exposed to seawater and marine environments.
Material Characteristics:
Copper-nickel alloy with approximately 90% copper and 10% nickel
Good resistance to seawater corrosion
Good resistance to erosion-corrosion under appropriate flow conditions
Suitable for marine piping systems
Good fabrication and welding characteristics
Compatible with copper-nickel piping systems
Suitable for long-term service where copper-nickel materials are specified
The addition of iron and manganese in CuNi 90/10 grades contributes to the material's performance in marine service. Exact chemical limits depend on the applicable material specification.
Product Structure
The DIN 86090 elbow is designed with butt-weld ends, allowing the fitting to be directly welded to compatible copper-nickel pipe.
Main Design Features:
Elbow configuration: 45° or 90° according to requirement
Connection: Butt weld
Bend geometry: Controlled radius for piping installation
End preparation: Suitable for butt welding
Wall thickness: Selected to correspond with the connected pipe
Dimensional control: Based on applicable DIN 86090 requirements
This configuration provides a continuous welded piping connection without introducing a flanged joint at the elbow location.
Manufacturing Process
The manufacturing route is selected according to the required size, material condition and production specification.
Raw Material Selection Copper-nickel alloy material is selected according to the specified grade and chemical requirements.
Material Verification Chemical composition and material identification are checked before forming.
Elbow Forming The tubular material is formed into the required elbow geometry.
End Preparation Butt-weld ends are prepared to facilitate connection with the mating CuNi pipe.
Heat Treatment Heat treatment is performed when required by the material specification and production procedure.
Dimensional Inspection Outside diameter, wall thickness, bend angle, radius and end dimensions are checked.
Surface Inspection The fitting is visually inspected for surface defects and forming-related irregularities.
Final Inspection & Marking Product identification and inspection documentation are completed before packing.
Applications
DIN 86090 CuNi 90/10 elbows are particularly suitable for piping systems where copper-nickel alloys are specified.
Marine & Shipbuilding
Seawater cooling lines
Sea chest piping
Fire-fighting seawater systems
Ballast piping
Bilge and drainage systems
Marine cooling circuits
Offshore & Seawater Systems
Seawater intake lines
Cooling water piping
Offshore platform utility piping
Desalination-related piping
Seawater circulation systems
Industrial Piping
Heat exchanger piping
Condenser systems
Cooling water systems
Corrosion-resistant process piping
Power plant auxiliary cooling systems
Why Use CuNi 90/10 Elbows?
Seawater Corrosion Resistance CuNi 90/10 alloys are widely used in seawater piping because of their resistance to corrosion in properly designed and operated marine environments.
Good Resistance to Erosion-Corrosion Copper-nickel alloys can provide useful resistance to erosion-corrosion in flowing seawater when velocity, water chemistry and system design remain within appropriate service conditions.
Welded Piping Configuration The butt-weld design allows the elbow to form part of a continuous welded copper-nickel piping system.
Material Compatibility Using CuNi fittings with compatible CuNi pipe helps maintain material consistency throughout the piping system.
Project-Specific Dimensions Elbow angle, diameter, wall thickness and other dimensional requirements can be supplied according to the piping design and applicable specification.
Inspection & Testing
Inspection requirements can be customized according to the project specification.
Inspection / Test
Availability
Chemical Composition
Available
PMI
Available upon request
Visual Inspection
Standard
Dimensional Inspection
Standard
Wall Thickness Inspection
Available
Elbow Angle Inspection
Available
Bend Radius Inspection
Available
Surface Inspection
Standard
Welding Inspection
According to construction
NDT
According to project requirement
MTC / Material Certificate
Available
Third-Party Inspection
Upon request
Available Product Configurations
Parameter
Options
Material
CuNi 90/10
Related Grade
C70600*
Elbow Type
45° / 90°
Connection
Butt Weld
Size
DIN / Customized
Wall Thickness
Customized
Bend Radius
According to design
End Preparation
Butt Weld
Surface Condition
Mill / Customized
Inspection
Standard / Project Specific
*Final material equivalency should be confirmed by chemical composition and applicable specification.
Customization Options
The elbow can be manufactured or supplied according to project-specific requirements, including:
Nominal pipe size
Outside diameter
Wall thickness
Elbow angle
Bend radius
End preparation
Material condition
Inspection requirements
Marking requirements
Certificate requirements
Packing requirements
Certificates & Documentation
Typical documentation may include:
Material Test Certificate (MTC)
EN 10204 3.1 certificate
Chemical composition report
Mechanical test report
PMI report
Dimensional inspection report
Visual inspection report
NDT report when specified
Third-party inspection report
Certificate of conformity
Packing list
Documentation can be prepared according to the purchase order and project requirements.
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
