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

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

15NiCuMoNb5 chemical composition (%)
Material C N Cr P S Mn Mo Ni Cu Si Nb
WB36 ≤0.17 ≤0.020 ≤0.30 ≤ 0.025 ≤0.01 0.80~1.20 0.25~0.50 1.00~1.30 0.50~0.80 0.25~0.50 0.015~0.045
Mechanical property
Material Yield strength( Mpa)

at RT ———- 350℃

Ultimate tensile strength


Uniform elongation A₅(%)
WB36   430         353 610-760 ≥16


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.

Related products maybe you like
pipes for high pressure service
Large diameter alloy
A335 P22
A335 P9
A335 P5

Leave a Reply

Your email address will not be published. Required fields are marked *