Pressure vessel plates are specifically for fabricating vessels for storage and transportation in petroleum, chemistry industries and gas separation as well as other similar applications, such as various vertical vessel, heat exchanger, storage tanks, tank wagons etc. In view of the working environment and processing technology of the pressure vessels, the steel plates must have good cold bending & welding properties, with superior plasticity and toughness as well as high temperature short-time (or long-term) strength.
1. Normal vessel plates in Chinese standard
1.1Chemical composition Wt%
Steel grade | C | Mn | Si | P | S | Nb |
Q245R | ≤0.20 | 0.50-1.00 | ≤0.35 | ≤0.025 | ≤0.010 | |
Q345R | ≤0.20 | 1.20-1.60 | ≤0.55 | ≤0.025 | ≤0.010 | |
Q370R | ≤0.18 | 1.20-1.60 | ≤0.55 | ≤0.020 | ≤0.010 | 0.15-0.50 |
16MnDR | ≤0.20 | 1.20-1.60 | 0.15-0.50 | ≤0.020 | ≤0.008 | – |
1.2 Property indexes
Steel grade | Thickness mm | Tensile test | Impact test | Bending test | |||
Yield strength ReL, MPa |
Tensile strength Rm, Mpa |
Elongation A, % | Temp ℃ | Impact , J | 180º | ||
not less than | not less than | not less than | |||||
Q245R | 3-16 | 245 | 400-520 | 25 | 0 | 34 | d=1.5a |
>16-36 | 235 | ||||||
>36-60 | 225 | ||||||
60-100 | 205 | 390-510 | 24 | d=2a | |||
Q345R | 3-16 | 345 | 510-640 | 21 | 41 | d=2a | |
>16-36 | 325 | 500-630 | d=3a | ||||
>36-60 | 315 | 490-620 | |||||
60-100 | 305 | 20 | |||||
Q370R | 10-16 | 370 | 530-630 | 20 | -20 | 47 | d=2a |
>16-36 | 360 | d=3a | |||||
36-60 | 340 | 520-620 | |||||
16MnDR | 6-16 | 315 | 490-620 | 20 | -40 | 47 | d=2a |
>16-36 | 295 | 470-600 | d=3a | ||||
>36-60 | 285 | 460-590 | |||||
>60-100 | 275 | 450-580 | -30 | ||||
>100-120 | 265 | 440-570 |