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 seamless steel pipe (or 15NiCuMoNb5) were 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 waterworks of nuclear power equipment.
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.
The range of WB36 pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practice.
The greatest advantages of WB36 alloy pipe is 100% recovery, environmental protection, energy saving, resource saving. The Chinese government encourages to expand the application field of wb36 high-pressure alloy pipe.
15NiCuMoNb5 pipe chemical composition and Mechanical property are shown as figure below:
15NiCuMoNb5 chemical composition (％)
|Material||Yield strength( Mpa) at RT ———- 350℃||Ultimate tensile strength
|Uniform elongation A₅(%)|
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Alloy steel pipes
Alloy steel pipe is a kind of seamless steel pipe, its performance is much higher than the general seamless steel pipe, because this steel pipe inside containing Cr, high temperature resistance, low temperature, corrosion-resistant performance of other non-pipe joints not match, so the more extensive use of alloy tube in the petroleum, aerospace, chemical, electric power, boiler, military, and other industries.