DIN 86037 Composite Weld Neck Inner Flange | EEMUA 145 Copper Nickel Inner Flange PN10
What Is DIN 86037 Inner Flange?
DIN 86037 composite weld neck inner flange is a specialized flange designed for copper nickel seawater piping systems, commonly used in marine and offshore engineering applications.
This flange type consists of a copper nickel inner flange combined with a backing steel flange, forming a composite structure that improves corrosion resistance while reducing material cost.
Manufactured according to DIN 86037 standards and EEMUA 145 specifications, these flanges are widely used in CuNi 90/10 (UNS C70600) piping systems operating in seawater environments.
EEMUA 145 Copper Nickel Inner Flange
EEMUA 145 provides guidelines for copper nickel piping systems used in seawater service. The standard defines material requirements, fabrication methods, and inspection procedures for CuNi pipelines and fittings.
Under this specification, copper nickel inner flanges are designed to provide:
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Excellent corrosion resistance in seawater
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Compatibility with CuNi 90/10 pipes and fittings
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Reliable sealing performance in marine pipelines
These flanges are typically used together with copper nickel pipes, elbows, and tees in offshore and shipbuilding piping systems.
DIN 86037 Composite Inner Flange Specifications
| Item | Specification |
|---|---|
| Standard |
DIN 86037 Inner outer Flanges |
| Copper Nickel Specification | EEMUA 145 |
| Material | CuNi 90/10 (UNS C70600) |
| Flange Type | Composite Weld Neck Inner Flange |
| Pressure Rating | PN10 |
| Size Range | DN15 – DN600 |
| Application | Seawater Piping Systems |
Materials
The composite flange typically consists of two components:
Inner Flange Material
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Copper Nickel 90/10 (UNS C70600)
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CuNi10Fe1Mn
Backing Flange Material
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Carbon Steel
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Low Alloy Steel
This composite design allows the wetted part to remain corrosion resistant, while the backing flange provides structural support.
Chemical Composition
| Element | Cu | Mn | Pb | Ni | Fe | Zn |
| Copper Nickel 90/10 | 88.6 min | 1.0 max | .05 max | 9-11 max | 1.8 max | 1 max |
ASME SB151 CU-NI 90-10 FLANGES
MECHANICAL & PHYSICAL PROPERTIES
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Copper Nickel 90/10 | 0.323 lb/in3 at 68 F | 2260 F | 50000 psi | 20000 psi | 30 % |
Advantages of Composite Copper Nickel Inner Flanges
DIN 86037 composite inner flanges offer several advantages for marine piping systems:
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Excellent resistance to seawater corrosion
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High resistance to erosion and biofouling
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Lower cost compared with full copper nickel flanges
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Strong mechanical support from backing steel flange
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Long service life in offshore environments
Applications
DIN 86037 copper nickel inner flanges are widely used in industries where seawater corrosion resistance is required.
Our Copper Nickel Flange is often used in Desalination, Exchangers, Underwater tubing, Marine hardware, etc. Our Copper Nickel 90 / 10 Flanges & Copper Nickel 70 / 30 Flanges has good corrosion resistance, which further are fabricated by bending, forming and welding
Shipbuilding Industry
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Ship seawater pipelines
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Ballast water systems
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Firefighting pipelines
Offshore Oil and Gas
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Offshore platform seawater cooling systems
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Subsea pipelines
Desalination Plants
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Seawater intake pipelines
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Reverse osmosis systems
Power Plants
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Seawater condenser systems
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Cooling water pipelines
Our Copper Nickel Flange is often used in Desalination, Exchangers, Underwater tubing, Marine hardware, etc. Our Copper Nickel 90 / 10 Flanges & Copper Nickel 70 / 30 Flanges has good corrosion resistance, which further are fabricated by bending, forming and welding
These CuNi 90 / 10 Flanges can be fabricated by both hot and cold working procedures, and is readily weldable.
Our Cupro-nickel 90 / 10 Weld Neck Flanges as well has good fabricatability and high inherent resistance to biofouling. These Copper Nickel UNS C70600 Flanges are a strong and ductile material exhibiting good corrosion resistance.
We supply high-quality DIN 86037 composite weld neck inner flanges manufactured according to EEMUA 145 copper nickel piping specifications.
Our products provide:
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Reliable corrosion resistance for seawater service
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Strict dimensional and material inspection
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Competitive factory pricing
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Export-ready packaging
All flanges can be supplied with EN 10204 3.1 Mill Test Certificates.
