Q345R is a widely used
low alloy steel to build pressure vessels in China, equal to ASTM A516/
A516M Grade 70 medium carbon steel.
Q345R plates are called pressure vessel steel plates sometimes. These plates include
carbon steel and
alloy steel for high/intermediate/low-temperature applications.
According to Chinese national standard GB 713-2008, 16Mng,
16MnR and 19Mng are renamed Q345R.
Main chemical elements composition
C |
Si |
Mn |
P |
S |
Alt(min.) |
≤0.20 |
≤0.55 |
1.20-1.60 |
≤0.025 |
≤0.015 |
≥0.020 |
Main mechanical properties
Thickness (mm) |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
>16-36 |
510-640 |
≥345 |
≥21 |
>36-60 |
500-630 |
≥325 |
≥21 |