The use of bimetallic clad pipe

The performance of lined high chromium double metal composite pipe is at least 50 times that of ordinary steel pipe. The double metal composite steel pipe has inner lining made of wear resistant cast iron. The product has inner and outer double layers of metal. The inner lining material has good wear resistance and corrosion resistance. The material also has high mechanical strength and high impact resistance. Directly adopts the lost foam compounding process, casting and forming metallurgical compound, which is safe and reliable to use.

Lined with high-chromium bimetal composite straight pipe lined with high-chromium double-metal composite elbow lined with high-chromium bimetal composite tee lined with high-chromium bimetal composite four-way lined with high-chromium bimetal composite multi-pass, Lined with a high-chromium bimetallic composite reducer lined with a high-chromium bimetallic flash buffer.

How to use bimetallic clad pipe?

Because oil and natural gas contains a large amount of corrosive media such as hydrogen sulfide, carbon dioxide and chloride ions, especially the content of corrosive components in the oil and gas medium before pipeline purification in the seabed oil and gas field is high, and some even require heat transfer, and internal corrosion problems are very prominent. The use of stainless steel or corrosion-resistant alloys in large quantities is not economical. Double metal clad pipes are a good choice.

The bimetal clad pipe structure uses a corrosion-resistant alloy tube (stainless steel or corrosion-resistant alloy) as the inner liner (wall thickness 0.5-3mm) to contact the corrosive medium and carbon steel or low-alloy steel as the outer base pipe to withstand the pressure. low. Generally, the double-metal clad pipe contains 316L austenite stainless steel as the inner liner in the case of containing CO2 medium, and 2205 and 2505 duplex stainless steel can be used as the medium containing CO2 + small amount of chloride, when H2S+CO2 is contained. + Chloride, the inner liner should be 028, G3, INCONEL625 and Inconel825 nickel-base or iron-nickel alloy, in order to ensure the corrosion resistance of the pipeline, but also can choose the titanium alloy and other materials with excellent corrosion resistance as lining. The outer layer material is usually API 5L X42, X50, X60, X70, ASTM-A106GB and A335-P22 and other materials, so as to ensure the strength of the pipeline.

Double metal clad pipe can be divided into mechanical composite pipe and metallurgical composite pipe according to the manufacturing process. Foreign countries generally believe that the performance of metallurgical clad pipes is better than that of mechanical composite pipes, but it is also possible to make mechanical clad pipes reach the performance of metallurgical composite pipes through pipe end welding and other methods while maintaining low costs.

The bimetallic clad pipe was put into use abroad in 1991 and its usage increased year by year. The application of bimetallic composite pipes in domestic submarine pipelines has progressed relatively late. The Yacheng 13-4 gas field project is the first time that domestic double metal clad pipes are used in the marine environment. At that time, the material was an API 5LDX65 + S316L bimetal mechanical clad tube, which had a good effect.

Do you know what’s the cladding steel pipe used for?

1.Casing pipe for oil and gas transportation

Choosing stainless steel such as Incoloy625 and Incoloy825 for inner tubes to ensure the corrosion resistance of the pipe. The outer pipe are usually X42, X50, X60, X70, A335-P22 and other materials to ensure the strength of the pipeline. The American Petroleum Association (API) has developed the standard for composite pipes for pipelines,with the serial number API 5LD:Cr-Mo steel,super 13Cr, G3, C028 and other oil well tubes and the nickel-base alloy cladding tubes such as 825, 028.


The steel tube for superheater should have high temperature strength under the condition of 650 and 35 MPa steam,excellent surface temperature and corrosion resistance, and inner surface resistance to water vapor oxidation.

Japan Sumitomo metal company choose SUS310S, 35Cr-55Ni, 40Cr-55Ni as outer base tube and 17-14CuMo,Alloy800Has the inner tube,developed super supercritical boiler superheater cladding pipe.

Sandvik,a Sweden Steel Corp successfully developed carbon steel as an inner pipe and Sanicro28 steel with good corrosion resistance as outer pipe. The cladding steel pipe made by Sandvik does not need any change in the boiler structure design and can be used directly.

3.Waste incinerator

Cladding steel tube for waste incinerator.The outer tube can be made of Sanicro65 alloy, and the inner pipe may be carbon steel or chromium molybdenum steel with resistance to stress corrosion cracking.Europe and the United States have used 2 million meter composite steel pipe since the first installation cladding pipe incinerator superheater and water wall tubes in the 1971.

4. Heat exchanger

Cladding steel pipe used for heat exchanger should also have good thermal conductivity and a certain strength and corrosion resistance.

Sandvik manufactured cladding pipe with high alloy nickel chromium alloy 800 as the inner tube and the low-alloy steel ASTM A213 Ti2 as the outer pipe.NKK company from Japan made cladding pipe with API 5L-16MnV steel as its outer pipe and NIC42 steel as inner pipe.

5.Used for wear-resistant steel

A Japan company have made cladding steel pipe with SUS316L corrosion resistant steel for outer pipe,Stellite No12 alloy for inner pipe,after 4 years is still new.They has also been well applied in the pneumatic conveying pipe of other micro powder particles, and the demand is increasing.

6.Marine environment

  • Inner pipe:Nickel, Titanium stainless steel or Copper alloy.
  • Outer pipe:Carbon steel or low alloy corrosion resistant steel.

Cladding pipe used for marine environment made by Japan’s Kawasaki is widely used as marine heat exchanger tube and seawater desalination of seawater intake pipe.

The cost effectiveness of bi-metal-lined pipe is demonstrated by the fact that they has been used extensively abroad.The bi-metal-lined pipe has been popularized in the petroleum product transportation and refining industry of domestic oil and gas industry in recent years.However, there is still a big gap between domestic and foreign countries in terms of composite technology, efficient production and detection technology.I think there isn’t a long way to go in the popularization of bi-metal lined pipes in China.

2 thoughts on “The use of bimetallic clad pipe”

  1. Use hot rolling metallurgy composite plate or coil as material, modern advanced pipe-making technology (UOE, JCOE, COE and SAWH) to forming, SAWL or SAWH, and TIG etc. combined automatic welding process to complete welding. The welding quality is stable, and the product size accuracy is high. The composite plate or coil is manufactured by hot rolling technology, which can achieve metallurgical bonding of the atom between corrosion-resistant clad and the backing layer, the binding force reaches above 200MPa, the binding area rate can reach above 99.9%, and the performance is stable and reliable. The clad can meet the corrosion-resistant specific performance requirements, and the backing layer can meet the strength and rigidity condition the structure required.

  2. Bi-metal lined Pipes,called cladding steel pipe sometimes.The bi-metal lined pipe combines the strength, corrosion resistance and wear resistance of the base pipe and the outer pipe. It not only satisfies the special requirements but also saves costs.

    In a clad line pipe, the corrosion-resistant alloy forms a complete barrier layer on the internal surface of carbon or low-alloy steel pipe (usually referred to as the “backing steel”). In general, use of clad or bi-metal-lined pipe allows the economic use of expensive CRA materials,It has been widely concerned and used in many other fields abroad.


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