WB36 alloy pipe

WB36 alloy pipe that is commonly used in power plants, chemical plants, and other industrial applications.

WB36 alloy pipe has excellent mechanical properties such as high strength, good ductility, and toughness, as well as resistance to high temperatures and corrosion.

These characteristics make it an ideal material for use in boilers, heat exchangers, and other high-temperature industrial applications.

PMI test for WB36 pipe

What's WB36 Steel Pipe?

WB36 is a bainitic Ni-Cu-Mo steel micro-alloyed with niobium according German standards DIN WB36 . It is also known as 15NiCuMoNb5-6-4 according to EN 10216-2,ASTM A213 T36 and ASTM A335 P36.

WB36 alloy pipe is produced using various manufacturing processes such as hot-finished or cold-finished, depending on the desired size and application requirements. The pipes are then subjected to various tests such as flattening test, hydrostatic test or nondestructive electric test to ensure they meet the specified requirements.

WB36 seamless steel pipe (or 15NiCuMoNb5) was first developed by the German Mannesmann Company.Because of it’s high strength characteristic, WB36 pipe can be used for high pressure pipeline of temperature up to 500 ℃, or high thermal power unit parameters, such as supercritical unit of boiler steam drum, steam separator, header, steam generator, steam pipe, and high temperature or high pressure waterwoks of nuclear power equipment.

It is also known as 15NiCuMoNb5-6-4 according to EN 10216-2,ASTM A213 T36 and ASTM A335 P36.


What is 15NiCuMoNb5?

15NiCuMoNb5 is a high-temperature alloy steel that is used to make: Boiler tubes, Heat exchangers, Pressure vessels.

15NiCuMoNb5 is also known as: WB36, 1.6368, A335 P36, Diwa373.

15NiCuMoNb5 is a high-temperature alloy steel that is commonly used for manufacturing boiler tubes, heat exchangers, and pressure vessels. It is also known as P36 steel in some industries.

15NiCuMoNb5 belongs to the group of low-alloy steels, which means that it contains small amounts of additional alloying elements such as molybdenum, nickel, and copper. These elements improve the mechanical properties of the steel at high temperatures, increasing its resistance to corrosion, oxidation, and deformation.

The mechanical properties of 15NiCuMoNb5 depend on factors such as the heat treatment, processing conditions, and the specific requirements of the application. In general, however, this material has high strength and excellent creep resistance at elevated temperatures.

Overall, 15NiCuMoNb5 is a high-performance alloy steel that is commonly used in critical applications where high-temperature performance and corrosion resistance are required.

15NiCuMoNb5 pipe chemical composition and Mechanical property are shown as figure below:

Chemical Compositions(%) of 15NiCuMoNb5

≤ 0.025

Mechanical Properties of 15NiCuMoNb5

Yield strength( Mpa) at RT - 350℃ Ultimate tensile strength
Uniform elongation A₅
  430         353 610-760 ≥16

Specification Table of WB36 seamless steel tubes(stock)

Cargo space Outer diameter(mm) Wall thickness(mm) Length Steel grade Quantity (pc) Weight
H0910 299 34 12.1 15NiCuMoNb5-6-4(WB36) 1 2.688
H0509 299 36 9 15Ni1MnMoNbCu(WB36) 1 2.1
H0910 323.8 10.31 6.4 15NiCuMoNb5-6-4(WB36) 1 0.51
H0509 324 64 9.56 15NiCuMoNb5-6-4(WB36) 1 3.923
H0509 356 50 5 15Ni1MnMoNbCu(WB36) 1 1.89
H0509 368.3 34 4.5 15NiCuMoNb5-6-4(WB36) 1 1.261
H0509 406 45 9.3 15NiCuMoNb5-6-4(WB36) 2 7.452
H0509 406 40 4.91 15NiCuMoNb5-6-4(WB36) 1 1.773
H0509 406 40 6.78 15NiCuMoNb5-6-4(WB36) 1 2.448
H0509 406 40 8.4 15NiCuMoNb5-6-4(WB36) 1 3.033
H0509 406 40 9.38 15NiCuMoNb5-6-4(WB36) 1 3.386
H0509 406 26 7.03 15NiCuMoNb5-6-4(WB36) 1 1.713
H0509 406.4 45 9 15Ni1MnMoNbCu(WB36) 1 3.61
H0509 426 35 5.44 15NiCuMoNb5-6-4(WB36) 1 1.836
H0509 426 35 6.99 15NiCuMoNb5-6-4(WB36) 1 2.359
H0509 426 35 7.68 15NiCuMoNb5-6-4(WB36) 1 2.592
H0509 426 35 8.12 15NiCuMoNb5-6-4(WB36) 1 2.74
H0509 426 35 8.16 15NiCuMoNb5-6-4(WB36) 1 2.754
H0509 426 35 6.27 15NiCuMoNb5-6-4(WB36) 1 2.116
H0509 426 35 8.18 15NiCuMoNb5-6-4(WB36) 1 2.761
H0509 426 35 8.19 15NiCuMoNb5-6-4(WB36) 1 2.764
H0509 426 35 8.2 15NiCuMoNb5-6-4(WB36) 2 5.534
H0509 426 35 8.21 15NiCuMoNb5-6-4(WB36) 1 2.771
H0509 426 35 8.23 15NiCuMoNb5-6-4(WB36) 1 2.777
H0509 450 55 7.5 15NiCuMoNb5-6-4(WB36) 1 4.018
H0509 457 70 6.77 15NiCuMoNb5-6-4(WB36) 1 4.523
H0509 508 85 8.4 15NiCuMoNb5-6-4(WB36) 1 7.5
H0509 508 85 8.8 15NiCuMoNb5-6-4(WB36) 1 7.8
H0509 508 55 6 15Ni1MnMoNbCu(WB36) 1 3.705
H0509 508 60 6 15Ni1MnMoNbCu(WB36) 1 3.997
H0509 559 80 6.98 15NiCuMoNb5-6-4(WB36) 1 6.596
H0509 559 80 8.35 15NiCuMoNb5-6-4(WB36) 1 7.891
H0509 559 80 9.47 15NiCuMoNb5-6-4(WB36) 1 8.949
H0509 559 80 9.87 15NiCuMoNb5-6-4(WB36) 1 9.327
H0509 559 60 9.48 15NiCuMoNb5-6-4(WB36) 1 6.999
H0509 600 65 4.63 15NiCuMoNb5-6-4(WB36) 1 3.97
H0509 610 85 8.3 15NiCuMoNb5-6-4(WB36) 1 9.13
H0509 610 85 8.85 15NiCuMoNb5-6-4(WB36) 1 9.74
H0509 610 90 8.52 15NiCuMoNb5-6-4(WB36) 1 9.833
H0509 610 70 8.14 15NiCuMoNb5-6-4(WB36) 1 7.588
H0509 610 65 6.02 15NiCuMoNb5-6-4(WB36) 1 5.259
H0509 610 65 8.77 15NiCuMoNb5-6-4(WB36) 1 7.661
H0509 610 70 5 15Ni1MnMoNbCu(WB36) 1 4.61
H0509 610 65 5 15Ni1MnMoNbCu(WB36) 1 4.388
H0509 620 80 5.76 15NiCuMoNb5-6-4(WB36) 1 6.136
H0509 625 73 5.73 15NiCuMoNb5-6-4(WB36) 1 5.694
H0509 625 73 5.74 15NiCuMoNb5-6-4(WB36) 2 11.408
H0509 625 73 5.75 15NiCuMoNb5-6-4(WB36) 5 28.57
H0509 625 73 5.76 15NiCuMoNb5-6-4(WB36) 1 5.724
H0509 660 82 8.39 15NiCuMoNb5-6-4(WB36) 1 9.806
H0509 690 86 7.6 15NiCuMoNb5-6-4(WB36) 1 7.69
H0509 690 86 6.2 15NiCuMoNb5-6-4(WB36) 1 7.94
H0509 690 86 7.43 15NiCuMoNb5-6-4(WB36) 1 9.517
H0509 690 86 7.82 15NiCuMoNb5-6-4(WB36) 1 9.917
H0509 690 86 8.92 15NiCuMoNb5-6-4(WB36) 1 11.426
H0509 690 86 9.3 15NiCuMoNb5-6-4(WB36) 1 11.913
H0409 711 80 9 15Ni1MnMoNbCu(WB36) 1 11.2

15NiCuMoNb5-6-4 (WB36) pipe fittings


WB36 is a material characterized by fine-grain ferritic steel with the addition of 0.5% to 0.8% copper, which is precipitated to achieve high strength and high toughness.

According to data from material manufacturers, it has been reported that within a temperature range of up to 600°C, it exhibits strength equivalent to that of STPA28, a common Japanese steel, and it is known to have nearly twice the strength of conventional carbon steels.


This grade is mainly used in high-pressure, medium-temperature feedwater lines (close to 400 °C).


WB36 exhibits excellent high-strength properties up to 450 °C. The reduced weight of the feedwater piping components compared with conventional carbon steel allows improved resistance to thermal fatigue and very good heat transfer.

Delivery status
The steel tubes shall be delivered in a heat treated condition.

Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; 12000mm; and so on.

Max length: 16000mm, also U bending can be offered.

This inventory is part of the inventory, demand and other models in stock or order materials, please contact us.

Seamless tube processing

With years of expertise, we provide a diverse array of steel tube processing options. From sawing and machining tube blanks to intricate bending and upsetting operations, we actively assist you throughout your projects.

Our capabilities extend to eccentricity reduction and concentricity enhancement through turning and grinding. We excel in creating complex geometries using processes like rotary swaging and axial forming. Additionally, we offer property modifications via partial heat treatment, ensuring tailored solutions for your specific needs.

Variable wall thicknesses

Variable wall thicknesses

Drilling / stamping / lasering

Drilling / stamping / lasering

Peeling / roller burnishing

Peeling / roller burnishing

Cold forming

Cold forming







Thread rolling / threading

Thread rolling / threading

Partial hardening

Partial hardening

Turning / milling / grinding

Turning / milling / grinding

Reducing / expanding

Reducing / expanding





Alloy steel pipes are ideally suitable for chemical, petrochemicals, and other energy-related applications.

The alloy steel pipe adopts high quality carbon steel, alloy structural steel and stainless & heat resisting steel as raw material through hot rolling or cold drawn to be made.

Alloy steel can be used in process area where carbon steel has limitation such as

As an important element of steel products, alloy steel pipe can be divided into seamless steel pipe and welded steel pipe according to the manufacturing technique and tube billet shape.

Here you can see the common alloy steel grade that you will come across.

Why the application of alloy steel pipe is wider than others

There are many kinds of materials used for transport in industrial production. Specifically we will have more choices and it is not limited to the use of alloy steel pipe. But even in the face of more choices, many people tend to choose alloy steel pipe. People make their own choices will have their own reasons. This means the alloy steel pipe application has its own advantages. Compared with transmission lines made of other materials, after it meets the basic application requirements, its quantity is lighter. Then in the practical application of alloy steel pipe, it will have more advantages because of this. Besides its physical characteristic advantage, it also has economic advantages. The wide application of alloy steel pipe is with kinds of reasons. So in practical usage, we can exploit the advantages to the full, in this way can we get more profits in these applications of alloy steel pipe.

What requirements should alloy steel pipe application meet

The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.

The biggest advantages of alloy steel pipe

Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy steel pipe total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy steel pipe to provide a wider space for the development of the industry. The future needs of the average annual growth of China’s high-pressure alloy steel pipe long products up to 10-12%.

Specification, standard and identification of alloy steel pipes

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

Industries We Serve

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The biggest advantages of alloy steel pipe can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy tube total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy tube to provide a wider space for the development of the industry. According to the Chinese Special Steel Association alloy pipe Branch Expert Group, the future needs of the average annual growth of China’s high-pressure alloy pipe long products up to 10-12%.


Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The most important and desired changes in alloy steel are

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

Alloying Elements & Their Effects

Pipes, Tubes and Hollow Sections



Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.

Alloying Elements Effect on the Properties
Chromium Increases Resistance to corrosion   and oxidation. Increases hardenability and wear resistance. Increases high   temperature strength.
Nickel Increases hardenability. Improves   toughness. Increases impact strength at low temperatures.
Molybdenum Increases hardenability, high   temperature hardness, and wear resistance. Enhances the effects of other   alloying elements. Eliminate temper brittleness in steels. Increases high   temperature strength.
Manganese Increases hardenability. Combines   with sulfur to reduce its adverse effects.
Vanadium Increases hardenability, high   temperature hardness, and wear resistance. Improves fatigue resistance.
Titanium Strongest carbide former. Added to   stainless steel to prevent precipitation of chromium carbide.
Silicon Removes oxygen in steel making.   Improves toughness. Increases hardness ability
Boron Increases hardenability. Produces   fine grain size.
Aluminum Forms nitride in nitriding steels.   Produces fine grain size in casting. Removes oxygen in steel melting.
Cobalt Increases heat and wear   resistance.
Tungsten Increases hardness at elevated   temperatures. Refines grain size.

ASTM A335 Chrome Moly Pipe

ASTM A335 Pipe (ASME S/A335, Chorme-Moly) is a seamless ferritic Alloy-Steel Pipe for high temperature service.

ASTM A213 Tubes

ASTM A213 covers seamless ferritic and austenitic steel boiler,Boiler Tube, and heat-exchanger tubes for high temperature services, designated Grades T5, TP304, etc.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes