CuNi Fittings

Shihang CuNi Fittings (also named Copper Nickel Pipe Fittings or Cunifer Fittings) are made from high-grade CuNi 90/10 or CuNi 70/30 material, for exceptional and reliable performance. Our CuNi Fittings perfectly connect tubing and piping sections, to regulate, maintain or change the direction of flow.

Shihang CuNi Fittings have superior resistance to organic compounds, stress, abrasion, brine water, seawater, alkaline salts and most non-oxidizing acids. These CuNi Fittings are specially designed for shipbuilding, offshore industries, heat exchanger systems, chemical industries condensers, and many more.

copper nickel pipe fittings

Your Premier CuNi Fittings Manufacturer and Supplier

Types of CuNi Fittings

copper nickel pipe fittings (2)

CuNi Fittings Specification

Dimensions : ASME/ANSI B16.9, DIN Standard, EEMUA 146, EEMUA 234

Size : 1/2” to 24”,DN15-DN500

Type : Seamless / Welded

Schedule : SCH10, SCH40, SCH80

Pressure rate:10bar, 14bar, 16bar, 20bar

Grades : Copper Nickel 90/10 (C70600 ), CuNi10Fe1.6Mn, CuNi 90/10, 7060X

End:Plain, bevelled

CuNi Fittings Description

CuNi Fittings

Depending on your specific applications, Shihang CuNi Fittings come in different standards such as DIN 86087, DIN 86088, DIN 86089, DIN 86090, EEMUA 146 and EEMUA 234. Our CuNi Fittings must pass strict dimensional standards according to DIN, EEMUA, ASME and JIS.

Shihang large inventory of CuNi Fittings includes CuNi Elbow, CuNi Tee, CuNi Reducer, CuNi End Cap, CuNi Saddle. We offer both forged CuNi fittings and machined CuNi fittings.

Throughout the Shihang CuNi Fittings manufacturing, we adhere to strict quality control, for a consistent, tight dimensional tolerance and excellent surface finish. Our CuNi Fittings guarantee a solid tubing and tough pipe dressings for zero leakages in piping systems.

Shihang is a leading CuNi Pipe Fittings manufacturer in China, with over 20 years’ experience and know-how in designing, machining and fabricating pipe fittings.

Our experienced technical team helps in CuNi Fittings CAD design, material selection and specification, giving the best fittings for the most demanding and robust piping systems.

Presently, we have high-tech testing and manufacturing facility, implement strict control with certifications for our CuNi Fittings.

You can count on Shihang for all your CuNi Fittings needs as we have high-quality CuNi Fittings, made from the finest copper nickel alloy, at competitive prices.

For any questions on CuNi fittings, our technical support is on standby to help.

Contact us today for all your CuNi fittings needs.

CuNi Pipe Fittings: The Complete FAQ Guide

In this guide, you will find all information you’re looking for about CuNi pipe fitting.

Whether you want to learn about the chemical composition, uses, benefits, end configuration, grades, or standard specification, you’ll find everything here.

Take a look:

What are CuNi Pipe Fittings?

CuNi pipe fittings refer to accessories that are of use in the changing pipe sizes in a piping system.

These CuNI pipe fittings come in different sizes and designs for use, depending on your piping system.

Copper nickel pipe fitting

 Copper nickel pipe fitting

What is the difference between CuNi Pipe Fitting and CuNi Pipe Flanges?

Copper nickel flanges

Copper nickel pipe flanges

The function of both copper nickel pipe fittings and copper-nickel pipe flanges is to connect pipes or other accessories in the piping system.

However, pipe fittings tend to offer more flexible options such as dividing or combining flow, which is not the case for most CuNi pipe flanges.

Moreover, Cupronickel pipe flanges have thick and heavy construction design.

Besides, most of them provide a bolted connection.

On the other hand, nearly all Cupronickel pipe fittings do not offer bolted connections.

Compared to CuNi flanges, they are lightweight and thin in size.

What are the uses of CuNi Pipe Fitting?

The main uses of CuNI pipe fittings are:

  • Connects two piping system
  • Divides fluid flows
  • Changes the size of your pipes
  • Supports the piping system.
  • Redirecting the flow
  • Connecting two dissimilar pipes or accessories
  • Reduce the size of the pipe
  • End piping system

These uses depend on the type of CuNi pipe fittings.

What are the Benefits of CuNi Pipes Fittings?

CuNi pipe fittings offer a wide range of benefits.

For instance, they are versatile in their use since you can use it in a wide range of salinity applications.

This is due to their anti-corrosive characteristics.

They also offer durability, which is ideal for use in an application that has high-temperature requirements.

Also, an excellent thermal conductivity of these pipe fittings ensures maximum heat transfer.

You have minimal maintenance costs when you use CuNi pipes since they do not support the growth of microbial.

Which Grades of CuNi Pipe Fittings are there?

You can have different grades of CuNi pipe fittings depending on the percentage of individual elements in the alloys.

Some of the common grades available include:

  • 6Mn
  • CuNi 90/10
  • CuNi 70/30
  • CuNi 90/10 (C70600 )
  • 7060X

Are there Disadvantages of CuNi Pipe Fittings?


There are disadvantages to the use of CuNi pipe fittings.

First, they are relatively expensive when you compare to other pipe fittings.

They are also labor-intensive during the installation and maintenance process.

They are also prone to leaks over time.

Additionally, they are health hazards since they leave the fluid with a metallic effect.

Which Types of CuNi Pipe Fittings are there?

The main types of CuNi pipe fittings are:

  • Stub-ends is usually for but welding a pipe ideally when using a lap joint flange
  • Saddle pipe fittings form part of a tee pipe fitting and offer support to a piping system. This is through the transmission of a load to close structures.
  • Coupling fitting connects different piping systems.
  • Reducer fitting minimizes the size of your piping system
  • Tee fittings divide the fluid flow in a piping system
  • Adapter fitting is for connecting two piping accessories that are not similar.
  • Union fitting, whose function is to join different piping systems while allowing for any disconnection.
  • Elbow fitting changes the piping system direction to different directions depending on the piping design.
  • Cross fitting consists of an inlet and three outlets for easy fluid distribution in a piping system.
  • 180 ° bend fitting changes the direction of fluid flow by 180 degrees.
  • Endcap fitting covers the dead ends in a piping system.

How do you Install CuNi Pipe Fitting in Piping System?

The installation depends on the type of CuNi pipe fitting end connections.

The main types of end connection that you can connect to your piping system include:

· Threaded End

the end of your piping system and that of your fitting should be different.

That is, if the CuNi pipe fitting is male, the piping system should be female.

The size of the CuNi pipe fitting should fit into the end of the piping system.

You have to lubricate the ends for secure screwing.

If there is a need, you can use a PTFE tape to wrap around the male end.

During connection, you need to hold the CuNi pipe fitting tightly and start screwing in a clockwise manner until it is tight.

Tightness ensures the piping system is leakproof and durable.

· Bevelled End

The connection of beveled ends involves the use of the buttwelding technique.

This process involves the welding of the two ends after connection.

This results in a leakproof connection for your piping system.

· Plain End

Connecting a plain end mainly requires soldering.

Before this, you need to clean and prepare the surface of the pipe on which you will apply the solder using a “FLUX.”

When applying the solder, it should melt around the piping joint.

This creates a permanent joint that does not leak.

The size of the CuNi pipe fitting should fit into the piping system tightly before soldering takes place.

What is the Chemical Composition of CuNi Pipe Fitting?

The chemical composition of CuNi pipe fittings depends on the quantity of mainly copper and nickel.

The main chemical compositions are:

  • Copper nickel 70/30 pipe fittings

 70 30 copper nickel pipe fitting

70 30 Copper-nickel pipe fitting

  • Copper-nickel 90/10 pipe fittings

 90 10 copper nickel pipe fitting

90 10 Copper Nickel Pipe Fitting

How Deep Should a CuNi Pipe Thread into Cupronickel Pipe Fitting?

The depth of your CuNi pipe thread depends on the applied standard.

The main standard size available are:

  • NPT Standards
NPT Nominal Size Actual OD Hand Tight Turns Wrench Turns
1/8 0.405″ 4.5 2.5
¼ 0.54″ 4 3
3/8 0.675″ 4.5 3
½ 0.84″ 4.5 3
¾ 1.05″ 4.5 3
1 1.32″ 4.5 3.25
1 ¼ 1.66″ 4.5 3.25

BSP standards

BSP Nominal Size Major Diameter (OD) Minor Diameter (ID)
1/8 0.38″ 0.34
¼ 0.52″ 0.45
3/8 0.65″ 0.59
½ 0.83″ 0.73
¾ 1.04″ 0.95
1 1.30″ 1.19
1 ¼ 1.65″ 1.53

You need to ensure that the piping system has the same standards as that of your CuNi pipe fittings.

That is, if your piping system uses BSP standards, then your fitting should be of the same standard.

Where can you use CuNi Pipe Fitting?

The use of CuNi pipe fittings is common in the following applications:

  • Heating and cooling systems
  • Power generation plants
  • Shipbuilding
  • Desalination plants
  • Food processing industries
  • Marine offshore platforms

How much do CuNi Pipe Fitting Cost?

Various factors affect the cost of your CuNi pipe fittings, including:

 Cupronickel pipe fitting

 Cupronickel pipe fitting

· Manufacturer

Different manufacturers offer different prices for their CuNi pipe fittings.

Moreover, you can negotiate the best price with your manufacturer.

· Type of CuNi Pipe Fitting

The different types of CuNi pipe fittings have different functions and therefore costs differently.

You need to be specific to the type of CuNi pipe fittings you want.

· Material Grade of CuNi Pipe Fitting

The different material grades offer unique advantages to your piping system.

These material grades have different quantities of copper and nickel elements, which affect their price.


The higher the minimum order quantity for your CuNi pipe fittings, the lower the price.

This is because manufacturers enjoy a higher profit margin when you purchase more CuNi pipe fittings.

What should consider when choosing CuNi Pipe Fitting?

The following considerations are essential when choosing your CuNi pipe fittings:

· Pressure Rating

the different grades of CuNi pipes handle different pressure ratings.

Selecting a CuNi pipe fitting with an incorrect pressure rating may cause the piping system to leak or bust.

· Temperature Requirement

A given CuNi pipe fitting should handle the temperature of your piping system without causing any faultiness.

· Type of CuNi Pipe Fitting

The different types of CuNi pipe fittings have different designs and use.

Selecting the right type offers a secure connection and proper functioning.

· Specific Application and Use

Different CuNi pipe fittings have different uses, such as connecting piping systems, redirecting, or distributing the fluid flow.

You, therefore, have to check on the specific use of the fitting that you are picking.

· End Configuration and Joining Mechanism

You can have threaded, plain, or bevelled end configurations for your piping system.

These end configurations should correspond with that of your piping system for secure connections.

You also need to check if the end configuration conforms to either BSP and NPT standards.

Remember, the standard for your pipe fittings should correspond to that of your piping system.

That is, if your piping system is of BSP standard, then your pipe fitting should be of the same standard.

· Size OF CuNi Pipe Fitting

The size of your CuNi pipe fitting should fit adequately in your piping system.

This minimizes fluid leakages while enhancing the strength of your connections.

· Copper-nickel Alloy Grade

The main also grade include 70/30 and 90/10.

Each of these grades offers unique features to your CuNi pipe fittings.

You need to go through these features to select one that suits your piping system.

· Quality Testing and Certification

A proper CuNi pipe fitting should pass all the necessary tests and have all the quality certificates.

Such qualifications guarantee safe and quality connections for your piping system.

What are the End Connections in CuNi Pipe Fitting?

You can find any of the following end type connections for your CuNi pipe fittings:

· Plain End

This refers to a pipe whose cutting is a right angle to a pipe run.

It is common in the use of a socket weld when you want to use it on a slip-on flange.

· Bevelled End

This is one whose surface is not at 90-degrees to another surface.

A bevelled end is vital when there is welding involved.

you can also use it for deburring the end cuts to offer aesthetic safety.

· Threaded End

A threaded end is also called screw end and is common in pipes that are 3″ or less.

They allow for easy installation without the use of welding.

A threaded end can have ends that are either male or female.

How do you Manufacture CuNi Pipe Fitting?

Different types of CuNi pipe fittings have different manufacturing processes.

The common manufacturing process is:

· Extrusion Method

Extrusion method pushing a CuNi pipe through a die which forms a suitable CuNi pipe fitting.

· uter Die Method

It involves cutting CuNi pipe, exerting pressure through the use of a die to form a reducer pipe fitting.

· Hot Forming Method

Hot forming methods involve heating a CuNi pipe and forming the required CuNi pipe fitting while in the hot state.

· Flaring Technique

This entails the spreading of a CuNi plate to form a flange face.

· Deep Drawing Technique

This method entails cutting a CuNi plate and forming a suitable shape through the use of a drawing technique.

· Hydraulic Bulge Method

This involves cutting CuNi pipes and filling it with liquid.

You then place it in a hydraulic die and exert pressure forming a bulge.

· UO Technique

UO technique entails cutting a CuNi plate into a suitable size and shape.

You then form a U shape with the cut piece.

You then use a die to form an O shape before welding the two parts to form a CuNI pipe fitting.

  • Mandrel method

This process entails cutting CuNi pipe and heating it.

You then push it through a die to form the required pipe fitting.

It is vital to note that regardless of the manufacturing method of your CuNi pipe fitting, the critical steps involved are:

  • Inspection of raw materials
  • Chemical analysis
  • Cutting
  • Fabrication process
  • Heat treatment
  • Machining
  • Drilling
  • Mechanical property test
  • Dimension inspection
  • Marking
  • packaging

How do you measure CuNi Pipe Fitting?

CuNi pipe fittings can either be male or female.

The measuring method can vary depending on the type that you have.

· Male CuNi pipe Fittings

Use a tape measure to find the measurement of the outer circumference of your CuNi pipe fitting.

Once you have the circumference, you divide it by 3.14 to get its diameter.

The process is the same for CuNi pipe fittings with plain end connection.

Female CuNi Pipe Fitting

Measure the inside circumference of the pipe fitting and divide it by 3.14 to get the diameter.

Once you have the diameter, you need to determine the standard that the pipe fitting adheres to.

This will help you determine which chart to use for the conversion of your diameter to the nominal length.

Also, the conversion chart appears as follows:

outside or Inside Diameter Decimal Equivalent Nominal Diameter Typical Threads Per Inch
5/16 0.313 1/16 27
13/32 0.405 1/8 27
35/64 0.540 ¼ 18
43/64 0.675 3/8 18
27/32 0.840 ½ 14
1-3/64 1.050 ¾ 14
1-5/16 1.315 1 11-1/2
1-21/32 1.660 1-1/4 11-1/2
1-29/32 1.900 1-1/2 11-1/2
2-3/8 2.375 2 11-1/2
2-7/8 2.875 2-1/2 8
3-1/2 3.500 3 8
4 4.000 3-1/2 8
4-1/2 4.500 4 8

How do CuNi Pipe Fitting Work?

The different types of CuNi pipe fitting work differently.

For instance, you can have a CuNi pipe fitting that connects the piping system, divides or redirects fluid flows, changes the size of your pipes, or supports the piping system.

Selecting the appropriate CuNi pipe fitting and connecting it correctly is critical in ensuring it functions appropriately.

Which Material Grade are CuNi Pipe Fitting made from?

  • Copper-nickel 90/10 (C70600 )
  • CuNi10Fe1.6Mn
  • CuNi 90/10
  • 7060X
  • CuNi 70/30

What are the CuNi Pipe Fitting Standard Specification?

The main standard specifications for CuNi pipe fittings are:

  • ASME/ANSI B16.9
  • DIN Standard
  • EEMUA 146/EEMUA 234

These are the main standards. However, you can get customized standards depending on your manufacturer.

What is the difference between BSP and NPT Thread Types in CuNi Pipe Fitting?

Both BSP and NPT are international standards for CuNi pipe fittings.

However, they have major differences, including:

NPT Threaded Types for CuNi Pipe Fitting BSP Threaded Types for CuNi Pipe Fitting
Common in America and Canada markets Standard in the EU region, New Zealand and Asia
Has same pitch as BSP Has same pitch as NPT
Valleys and peaks of the thread are flat Valleys and peaks of threads are rounded
Thread angle is 60 degrees Thread angle is 55 degrees

What is Butt Weld in CuNi Pipe Fitting?

Buttweld CuNi pipe fittings refer to a fitting whose design allows for piping system connection via welding.

This type of fitting results in a strong, versatile, and a leakproof joint between your CuNi pipe fitting and the piping system.

The main alternatives to butt welding are socket weld and thread connections.

What is the difference between Male Threaded CuNi Pipe Fitting and Female Threaded Pipe Fitting?

The cutting of a male thread copper nickel pipe fittings is into the outside of the fittings.

The cutting of a female thread copper-nickel is into the inside of a copper-nickel fitting.

How does Male Slip-Fit compare to Female Slip-Fit Copper Nickel Pipe Fitting?

Copper nickel pipe fitting

 Copper-nickel pipe fitting

Male slip fit copper nickel pipe fittings are slightly smaller than the pipe.

Therefore, the copper-nickel pipe fitting will simply slip into the pipe.

On the other hand, a female slip fit flange is larger than the pipe.

Thus, the pipe can slip into the fitting.

How can you Test the Quality of CuNi Pipe Fitting?

The following are the quality tests for your CuNi pipe fittings:

  • Magnetic particle inspection
  • Tensile test
  • Ultrasonic testing
  • Proof test
  • Visual inspection
  • Hydrostatic testing

Clearly, CuNi pipe fittings play an integral role in offshore piping systems.

However, if you have more questions about CuNi pipe fittings, you can contact us now.

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You can also send the inquiry to email: directly.

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