Q345R (Low Alloy Steel)
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
Main mechanical properties
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 |
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