WB36 is a bainitic Ni-Cu-Mo steel micro-alloyed with niobium according German standards DIN WB36 .
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.
