Shihang CuNi tube is also known as Copper Nickel Tube or Cupro Nickel Tube. They are an alloy of Fe, Ni, C, Si, Mn, Ti, Cu, and S mixed in different proportions.

As your one-stop supplier, Shihang can offer you excellent quality CuNi tube featuring 90/10 Cuni tube and 70/30 Cuni tube. The offered tube is available in a wide range of sizes, thicknesses, and grades.

Shihang CuNi tube is widely used in offshore environments, especially for pressure, high velocity, and turbulent applications. The cuni tube offers excellent resistance to erosion and corrosion.

CuNi Tube Workshop

For heat exchanger, high capacity power plants, coolers, condensers, distiller tubes, and offshore environments applications, we highly recommend you to use Shihang CuNi Tube.

Shihang Cuni tube is available in different sizes ranging from 20 mm to 0.5 mm thickness. As a leading CuNi tube manufacturer in China, Shihang offers a custom CuNi tube according to your specific requirements.

With our 20 years of experience, you can assure that Shihang can give you excellent quality CuNi tubes along with the best and excellent prices and services. At Shihang, we can always provide what you need!

Along with our modern production facility and testing laboratory, you are assured with our fast turnaround and high-quality CuNi tube. We use a seaworthy wooden case to pack your Cuni tube for transportation and shipping.

Additionally, Shihang CuNi tube manufacturing factory becomes the most trusted supplier in China by providing top quality CuNi tubes in the market. We are equipped with expert engineers and professional CuNi tube designers.

Aside from CuNi tube, Shihang is also an expert in manufacturing CuNi pipes, CuNi flanges, CuNi round bar, and many more. You can check these pages for the information and get an instant quote.

For further info about Shihang CuNi Tube, please feel free to contact us and expect a response within two hours!

CuNi Tube: The Ultimate FAQ Guide

In this guide, you’re going to learn everything about CuNi tubes such as uses, characteristics, quality standards, cutting options, and quality testing, just to mention a few.

Therefore, before you import copper nickel tubes from China, read this guide.

What is a CuNi Tube?

CuNi tubes refer to specially designed tubes consisting of an alloy of mainly copper and nickel, alongside other elements.

These two elements have unique properties that strengthen the functionality of these tubes.

Other elements that are present in these tubes are manganese, lead, and iron.

Copper nickel tube

Copper nickel tube

CuNi Tubes are available in which Grades?

The primary grades of CuNi tubes are:

Where can you use CuNi Tubes?

CuNi tubes are useful in the following areas:

Condenser
Desalination plants
Underwater tubing
Heat exchangers
Water treatment plants
Marine applications

What are the Characteristics of CuNi Tubes?

CuNi tubes have the following characteristics:

Anti-fouling properties
Anti-microbials
Anti-corrosive
Durable
Flexible

What are the Benefits of using CuNi Tubes?

CuNi tubes have the following benefits:

CuNi Tube

CuNi Tube

They are versatile in their use. This allows for use in high-temperature applications since they can withstand such temperatures
They inhibit the growth of microbial. Microbials are a threat to proper fluid flow within your tubing system.
They are anti-corrosive, which allows for use in highly corrosive environments, like salty water.
Flexibility in these tubes allows for machining and alteration and their design to fit your specifications.
They are relatively easier and cheaper to operate

What is the Connection Procedure for CuNi Tubes?

The connection procedure depends on the end configuration of both your application and CuNi tubes.

For threaded CuNi tubes, the procedure entails screwing the end into your piping system.

When connecting plain and beveled, you need to weld around the joint.

This gives you a tight and leakproof joint.

Which Welding Alternatives can you use on CuNi Tubes?

It is possible to use the following welding methods on CuNi tubes:

· Manual Metal Arc Welding

Manual metal arc welding is flexible to use on your CuNi tube regardless of its position.

It is relatively cheaper compared to other methods since you don’t need a shielding gas.

The absence of a shielding gas makes it possible for outdoor usage of this method even in adverse weather conditions.

It is, however, a less effective method due to high waste production.

You also have to hire qualified experts to work on this method, which can be expensive and unavailable in some instances.

· Tungsten Inert Gas Welding

You can choose between manual or orbital tungsten inert gas welding for your CuNi tubes.

This method allows you to weld your tubes in whichever position they are on your application.

The welding process forms joints that are flawless and durable.

Another benefit of this method is its cost-saving feature since you don’t need to use a filter metal.

This method, however, is time-wasting and is relatively expensive than the other methods.

You also need skilled workers to operate, which can be unavailable.

· Resistance Welding

Resistance welding can either be resistance spot welding, resistance seam welding, resistance butt welding, and resistance projection welding.

Each of these methods offers unique characteristics to your tubes.

The benefits of using this method include its simplicity and its ability to use on a wide range of thin and thick tubes.

Its use also reduces cost since you don’t have to use a filler metal.

The limitation of this method is the high maintenance that this method requires.

It also uses high power, which increases its overall cost.

· Metal Inert Gas Welding

The welding speed of this method is relatively high and produces minimal welding spatter compared to the other methods.

The ability to automate this method allows for flexibility in terms of use.

You, however, have a limit as to the thickness of CuNi tubes that you can weld as it is not ideal for thicker tubes.

The surface you are working on needs to be clean, which can be tedious and costly in the long run.

Which Surface Finishing can you Apply on CuNi Tubes?

The final effect on your CuNi tubes should guide you on the selection of which surface finish to use.

Other factors that you need to consider the speed of applying a given surface finish and the hardness of the CuNi tubes.

Among the main surface finishes for use include:

Copper nickel tube

Copper nickel tube

· Mirror Surface Finish

A mirror surface finish features a polished surface that has an aesthetic appeal.

It is an ideal option for use in high hygienic applications.

The process involves vertical grinding and buffing of the surface.

An alternative method involves the use of electric sparking before polishing the CuNi tube surface.

The complexity of this method makes it unattractive to use on these tubes.

· Sandblast Surface Finish

Applying to sandblast surface finish is relatively easier compared to other methods.

The process uses compressed air and a blasting gun.

Sandblasting gives you the option of further working on the CuNi tubes since it leaves the surface uniform.

The environmental reaction is the main limitation to the use of this method.

· Matte Surface Finish

The limitation to this surface finish is it leaves fingerprints on the surface.

This makes the surface appear dirty, even when it is clean.

How much does a CuNi Tube Cost?

The cost of CuNi tubes is different depending on several factors. These include:

· CuNi Tube Dimensions

Thicker and longer CuNi tubes are expensive compared to thinner and shorter CuNi tubes.

To minimize your cost, you have to specify these dimensions before purchasing.

· CuNi Tube Type

The two types of CuNi tubes have different properties that facilitate their operations.

For instance, welded CuNi tubes have a lower operating pressure than seamless CuNi tubes.

The properties of your applications, like the operating pressure and temperature, should guide you in this case.

There are different chemical compositions for CuNi tubes, which you need to evaluate before selecting which to use.

CuNi Tubes are available in Which End Designs?

The three main end designs that you can find in CuNi tubes are:

Threaded end design has a tapered groove on its ends. When connecting to your system, you have to screw these ends into your application.
Plain end design whose end design is perpendicular to that of the tube’s surface. When connecting this type, you have to fit it into your application and weld it around the joint.
Beveled end design has its ends at an angle to the tube’s surface. You have to weld the joining region when connecting this type of tube.

How do you select a CuNi tube?

You need to check on the following when you want to select a CuNi tube for your use:

· Dimensions

Critical dimensions that you need to consider here include the length, thickness, and overall diameter.

The thickness helps in ensuring there is consistency in the fluid pressure.

The length ensures that your tube correctly fits into your piping system.

· Type of CuNi Tube

You need to choose between a seamless CuNi tube and a welded CuNi tube.

These types have different properties, which makes them suitable for use in various applications.

· Quality Standards

You need to check on the quality standards of a particular CuNi tube.

These standards ensure the tubes you selecting work appropriately.

· End Configuration

The end configuration is vital when selecting your CuNi tubes in terms of connection.

These configurations should be in

· Operating Pressure and Temperature

Checking on the operating pressure and temperature of these tubes minimizes their rapture and slow fluid flow.

The high operating pressure of the fluid than that of the tube results in their bursting.

When you have a high-temperature fluid flowing through the tubes, they expand.

This results in a pressure drop, which reduces the fluid flow.

The ideal operating pressure and temperature should be within the range of your application.

You will find all these details on the package.

What is the comparison between CuNi tubes and CuNi bars?

A CuNi tube is mainly hollow, while a CuNi bar is solid.

The walls of a CuNi bar is thicker than that of a CuNi tube.

The outer diameter is vital when getting the measurements of your CuNi tubes.

For the measurements of your CuNi bar, you need to use both the outer and inner diameter.

The manufacturing process of a CuNi tube is different from that of a CuNi bar.

Which Cutting options can you Use on CuNi Tubes?

When you are choosing the best cutting option, you have to put the following factors into consideration:

The end state that a given cutting option offers to the edges of your CuNi tube.
The cutting speed that a given option offers

You can cut CuNi tubes using the following methods:

· Band Saw Cutting

This method is relatively cheaper compared to the others and easier to use.

You don’t have to hire a skilled workforce to use this method.

You can use this method in terminating sections of your tubes.

It, however, has numerous limitations that make it unsuitable for cutting your CuNi tubes.

For example, it leaves rough edges on the cutting area.

Such edges have a limitation as o further machining and connection.

Also, when cutting the ties, they have to be in a horizontal position.

This reduces the working area, such as in a vertical position.

It also does not allow for use in an existing tubing system as it may affect the operation.

· Cold Sawing

Cold sawing method consists of a round blade that cuts your CuNi tubes.

The advantage of this method is that the blade absorbs heat during the cutting process.

This minimizes the deformation of these tubes during the process.

You can also use this method in different tube thickness.

Cold sawing method cuts many tubes within a short time.

· Abrasive Cutting

The primary tool that you use here is a thin wheel that grinds and erodes the tubes as it cuts them.

It is a faster method than the others making it an ideal option for bundle cutting of CuNi tubes.

The resulting edges are fine and clean, which allows for proper connection or further machining.

This method, however, is not recommended for cutting large diameter CuNi tubes.

This is because, during the cutting process, the wheels absorb heat, which can result in the deformation of these tubes.

· Lathe Cutting

The essential advantage of using this method is the accuracy level that it cuts your CuNi tubes.

This accuracy results in a cutting that you can use for further machining while reducing the overall waste that it produces.

It is, however, an expensive method to use both in purchasing the tools and the energy and workforce it requires.

You have different options to choose from in this method.

They include special-purpose lathe, turret lathe, capstan lathe, and toolroom lathe.

What is the Comparison between Seamless and Welded CuNi Tubes?

The surface of a seamless CuNi tube is smooth, while that of a welded CuNi tube consists of joints due to welding.

The manufacturing method for a seamless CuNi tube is different from that of a welded CuNi tube.

For a seamless CuNi tube, these methods include extrusion, plug rolling, mandrel, and forging.

The manufacturing process of welded CuNi tubes is submerged, electric fusion, high frequency, and electrical resistance.

Seamless CuNi tubes have high operating pressure and temperature compared to that of welded CuNi tubes.

Welded CuNi tubes have joints that can rupture when you exert too much pressure.

The price of seamless CuNi tubes is higher compared to that of welded CuNi tubes due to their unique characteristics.

How does CuNi finned tube compare to plain CuNi Tube?

The presence of fins in CuNi finned tubes is what differentiates it from plain CuNi tubes.

The heat transfer rate of CuNi finned tubes is higher compared to that of plain CuNi tubes.

CuNi finned tubes have a versatile use compared to plain CuNi tubes.

How do you test the quality of CuNi Tubes?

The reason for carrying out testing on CuNi tubes is to ensure you have high quality and reliable CuNi tubes. These tests include:

Mechanical test
Intergranular corrosion test
Chemical analysis
Pitting resistance test
Hardness test
Flattening test
Flaring test

Is there a difference between CuNi Tube and CuNi Pipe?

Yes. There is a difference between a CuNi tube and a CuNi pipe.

A CuNi pipe has a round surface, while the surface of a CuNi tube can either be round, rectangular, or square.

The wall thickness and outer diameter are vital when analyzing the measurements of a CuNi tube.

When measuring a CuNi pipe, the outer diameter is essential.

In short, once you consider everything in this guide, you can definitely choose quality CuNi Tubes.