Composite Slip On Flange
Composite Slip On flanges are comsited with copper nickel inner flange ( also called as copper nickel collar, copper nickel stub end ) and carbon steel outer flanges. Composite Slip On flanges are normally used on shipbuilding.Composited slip on flanges are socket welded with the pipes. It’s a little different with composite weld neck flanges.
- MTC EN 10204 3.1 Certifacte is available
- Seaworthy Wooden Case Packaging
- Tolearance:100% meet the standard.

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Types of Composite Slip On Flange
Composite Slip On Flange Description
Copper Nickel Composite Slip On Flange
Shihang Copper Nickel Composite Slip On Flange features a copper nickel inner flange (collar) and carbon steel backing flange (loose flange). It’s copper nickel inner flange is an alloy of Ni, Fe, Mn, C, Pb, S, P, Zn, Zr, Cu and other chemical compounds, mixed in different proportions.
Shihang Copper Nickel Composite Slip On Flange conform to the DIN 86036 and EEMUA 145 standards, making it the best flange for non-critical, low temperature and pressure applications.
Our Copper Nickel Composite Slip On Flange offers a cost effective and reliable flanging in shipbuilding, offshore oil & gas platforms, seawater systems, desalination plants, power generation, etc.
Shihang Copper Nickel Composite Slip On Flange has CuNi 90/10 collar or CuNi 70/30 collar, with different dimensions and thickness, depending on specific customer requirements.
Holes of Shihang Copper Nickel Composite Slip On Flange collar are precisely manufactured to match the pipe diameter, for easy installation and welding of fillet, with the backing being active.
Collar provides an effective sealing mechanism, as the backing flange presses them together, for a flawless piping system. Shihang Copper Nickel Composite Slip On Flange is designed to ensure backing flange is not in contact with the media.
Depending on specific client requirements, Shihang Copper Nickel Composite Slip On Flange is available in different grades, from ASTM B151 UNS C70600, 7060X, CuNi 90/10,CuNiFer, CuNi10fe1.6mnASTM B151 UNS C71500 , CuNi 70/30,CuNiFer to CuNi30fe1.6mn.
As a professional Composite Slip On Flange manufacturer, Shihang has stringent quality control (QC) throughout the entire production process. Our Composite Slip On Flange has consistent and predictable tensile strength, yield strength, elongation and chemical composition.
Shihang supplies all Copper Nickel Composite Slip On Flange with quality test certificates indicating test results, depending on relevant specifications.
With rich experience of over 20 years in Copper Nickel Composite Slip On Flange manufacturing, our flange tolerance and quality is the best in the industry.
We have a range of material in stock, high-tech manufacturing machines and professional team to take you through the CAD drawings. Shihang will handle your specific Copper Nickel Composite Slip On Flange needs.
Our technical support is available 24/7, ready to help you in all your custom Composite Slip On Flange needs. Talk to us now, and we will answer all your composite slip on flange needs.

Copper Nickel Flanges Specification
Composite Slip On Flanges Specifications
Grade:Copper Nickel Inner Flanges:ASTM B151 UNS C70600, CuNi10Fe1.6Mn, 7060X
Carbon Steel Outer Flanges: A105N with Galv.
Dimensions & Standard : DIN 86036, EEMUA 145, EEMUA 234
Class / Pressure : PN10,PN14, PN16, PN20
Size:DN15-DN500
Copper Nickel Composite Slip On Flange: The Ultimate FAQ Guide
- What is Copper Nickel Composite Slip on Flange?
- How is Copper Nickel Composite Slip on Flange Made?
- Where Can you Use Cupronickel Composite Slip on Flange?
- How does DIN and EEMUA Composite Slip on Flange Compare?
- What is CuNi Composite Slip on Flange used for?
- How do you Specify Copper Nickel Composite Slip on Flange?
- What is the difference between Loose Flange and Collar in CuNi Composite Slip on Flange?
- What is the Chemical Composition of Cupronickel Composite Slip on Flange?
- How do you Install Copper Nickel Composite Slip on Flange in Piping System?
- How does CuNi Composite Slip on Flange Work?
- What is the difference between Cupper Nickel Composite Slip on Flange and Composite Weld Neck Flange?
- What are Copper Nickel Composite Slip on Flange Dimensions?
- How do you Prevent Leakage in CuNi Composite Slip on Flange?
- When should you Use Cupronickel Composite Flange Instead of CuNi Weld Neck Flange?
What is Copper Nickel Composite Slip on Flange?
Cupronickel composite slip on flange is a modified version of the standard slip on flange.
It has an inner flange, also referred to as a collar or stub end and an outer flange.
Unlike standard copper nickel flange made from only CuNi alloy, copper nickel composite slip on flange is made of two different materials. That is:
- Collar or stub end is a copper nickel alloy
- The outer flange is A105N carbon steel
Figure 1 CuNi Composite Slip On Flange
How is Copper Nickel Composite Slip on Flange Made?
The process of manufacturing copper nickel composite slip on flange involves the following key stages:
- Inspect the quality of raw material for both inner flange and outer flange
- Cut copper nickel alloy bar to suitable dimensions
- Forge and form the cut copper nickel bar to form stub end of the composite slip on flange
- Cut A105N carbon steel to suitable dimension, then forge and form to form the outer flange of copper nickel composite slip on flange
- Machine the outer flange by drilling bolt holes
- Subject the inner flange and outer flange to suitable heat treatment
- Inspect and mark the copper nickel composite slip on flange – marks may include dimension standards, pressure rating, material grade, lot number, etc.
- Pack in a seaworthy packaging ready for shipping
Where Can you Use Cupronickel Composite Slip on Flange?
Cupronickel composite slip on flange is suitable for applications that meet the following criteria:
- Non-critical
- Low temperature
- Low pressure
Some of the practical applications include:
- Shipbuilding
- Seawater piping systems
- Power generation
- Offshore oil and gas platform
- Desalination plants, etc.
What is CuNi Composite Slip on Flange used for?
CuNi composite slip on flange provides a reliable way of connecting copper nickel pipes, copper nickel pipe fittings, and other pipe accessories such as valves, pumps, etc.
Moreover, they have low initial installation cost over copper nickel composite weld neck flanges.
How does DIN and EEMUA Composite Slip on Flange Compare?
- Both DIN 86036 and EEMUA 145 specify standards for both inner flange and outer flange
- Size for both the DIN 86036 and EEMUA 145 varies between DN 15 to DN 100 for inner flange
- For inner flange, pressure rating for DIN 86036 is 10 bar and 14 bar while for EEMUA 145 the pressure is 16 bar and 20 bar
- In both DIN 86036 and EEMUA 145, inner flange is a copper nickel alloy
- For both DIN 86036 and EEMUA 145, outer flange is A105 carbon steel with options for galvanization and epoxy coating
How do you Specify Copper Nickel Composite Slip on Flange?
Figure 2 Composite slip on flange
Whenever you are specifying copper nickel composite slip on flange, you should focus on the following:
- Standard specifications where you can choose either DIN 86036 or EEMUA 145
- Size
- The material grade for inner flange and outer flange
- Pressure rating
Where necessary, you should also request for quality testing certificates such as EN 10204 3.1 Certificate.
What is the difference between Loose Flange and Collar in CuNi Composite Slip on Flange?
Loose flange or backing flange is made of A105N carbon steel. It is also called the outer flange.
Moreover, the loose flange has bolt holes and presses the assembly together.
Collar flange or inner flange is made from grades of a copper nickel alloy. It provides a sealing mechanism.
What is the Chemical Composition of Cupronickel Composite Slip on Flange?
The chemical composition of copper nickel composite slip on flange will depend on the standard specifications.
For the outer flange, the material is A105N carbon steel whose chemical composition includes:
Element | Composition in % |
Carbon | 0.35 max |
Copper | 0.40 max |
Molybdenum | 0.12 max |
Sulfur | 0.040 |
Manganese | 0.6 to 1.05 |
Silicon | 0.10 to 0.35 |
Phosphorous | 0.035 |
Chromium | 0.30 max |
Vanadium | 0.08 max |
Nickel | 0.40 max |
When it comes to the inner flange, which is made from copper nickel alloys, you can choose any of the following:
Figure 3
Figure 4
How do you Install Copper Nickel Composite Slip on Flange in Piping System?
With the backing flange being active, inset the composite slip on flange into a copper nickel pipe.
Once fully fixed, fillet weld both the inside and outside surface of the composite slip on flange.
At the same time, the backing flange will press the entire assembly together for a robust and reliable connection.
How does CuNi Composite Slip on Flange Work?
Since the collar of composite slip on flange acts as a “ring”, you will slip it on the copper nickel pipe.
You will then fillet weld while the outer flanges compress the whole assembly together.
This way, it produces a robust joint/connection in the piping systems for a consistent and reliable flow.
What is the difference between Cupper Nickel Composite Slip on Flange and Composite Weld Neck Flange?
Figure 5
Copper Nickel Pipe Composite Slip on Flange | Copper Nickel Composite Weld Neck Flange |
Suitable for low pressure applications | Suitable for high pressure applications |
You will fillet weld with copper nickel pipe | Are usually butt welded with copper nickel pipe |
Suitable for low-temperature applications | Suitable for both low and high-temperature applications |
Less costly compared to CuNi composite weld neck flange | More expensive than CuNi composite slip on flange |
Low life expectancy | Higher service life expectancy |
What is Copper Nickel Composite Slip on Flange Dimension?
The dimensions of copper nickel composite slip on pipes are according to the DIN 86036 or EEMUA 145/EEMUA 234 standards.
How do you Prevent Leakage in CuNi Composite Slip on Flange?
- Choose composite slip on flange whose tolerance meets the stipulated standards
- Adopt accurate and consistent composite slip on flange forging, forming, heat treatment and machining techniques
- Properly fillet weld and assemble composite slip on flange
- CuNi composite slip on flange must pass strict quality standards and testing
When should you use Cupronickel Composite Flange Instead of CuNi Weld Neck Flange?
When dealing with low pressure and low-temperature applications, copper nickel composite slip on flange provides a cost-effective solution.
Besides, Cupronickel composite slip on flange guarantees cost-effective initial installation cost.