WB36

is a bainitic Ni-Cu-Mo steel micro-alloyed with niobium according German standards DIN . 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

Mpa

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

Application

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

Challenges

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.

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